1 ## <a name="3 AFS administration"></a> 3 AFS administration
3 The Administration Section of the [[AFSFrequentlyAskedQuestions]].
11 <li><a href="#3 AFS administration"> 3 AFS administration</a><ul>
12 <li><a href="#3.01 Is there a version of xdm"> 3.01 Is there a version of xdm available with AFS authentication?</a></li>
13 <li><a href="#3.02 Is there a version of xloc"> 3.02 Is there a version of xlock available with AFS authentication?</a></li>
14 <li><a href="#3.03 What is /afs/@cell?"> 3.03 What is /afs/@cell?</a></li>
15 <li><a href="#3.04 Given that AFS data is loc"> 3.04 Given that AFS data is location independent, how does an AFS client determine which server houses the data its user is attempting to access?</a></li>
16 <li><a href="#3.05 How does AFS maintain cons"> 3.05 How does AFS maintain consistency on read-write files?</a></li>
17 <li><a href="#3.06 Which protocols does AFS u"> 3.06 Which protocols does AFS use?</a></li>
18 <li><a href="#3.07 Which TCP/IP ports and pro"> 3.07 Which TCP/IP ports and protocols do I need to enable in order to operate AFS through my Internet firewall?</a></li>
19 <li><a href="#3.08 Are setuid programs execut"> 3.08 Are setuid programs executable across AFS cell boundaries?</a></li>
20 <li><a href="#3.09 How can I run daemons with"> 3.09 How can I run daemons with tokens that do not expire?</a></li>
21 <li><a href="#3.10 Can I check my user's pass"> 3.10 Can I check my user's passwords for security purposes?</a></li>
22 <li><a href="#3.11 Is there a way to automati"> 3.11 Is there a way to automatically balance disk usage across fileservers?</a></li>
23 <li><a href="#3.12 Can I shutdown an AFS file"> 3.12 Can I shutdown an AFS fileserver without affecting users?</a></li>
24 <li><a href="#3.13 How can I set up mail deli"> 3.13 How can I set up mail delivery to users with $HOMEs in AFS?</a></li>
25 <li><a href="#3.14 Should I replicate a _Read"> 3.14 Should I replicate a ReadOnly volume on the same partition and server as the ReadWrite volume?</a></li>
26 <li><a href="#3.15 Should I start AFS before"> 3.15 Should I start AFS before NFS in /etc/inittab?</a></li>
27 <li><a href="#3.16 Will AFS run on a multi-ho"> 3.16 Will AFS run on a multi-homed fileserver?</a></li>
28 <li><a href="#3.17 Can I replicate my user's"> 3.17 Can I replicate my user's home directory AFS volumes?</a></li>
29 <li><a href="#3.18 What is the Andrew Benchma"> 3.18 What is the Andrew Benchmark?</a></li>
30 <li><a href="#3.19 Where can I find the Andre"> 3.19 Where can I find the Andrew Benchmark?</a></li>
31 <li><a href="#3.20 Is there a version of HP V"> 3.20 Is there a version of HP VUE login with AFS authentication?</a></li>
32 <li><a href="#3.21 How can I list which clien"> 3.21 How can I list which clients have cached files from a server?</a></li>
33 <li><a href="#3.22 Do Backup volumes require"> 3.22 Do Backup volumes require as much space as ReadWrite volumes?</a></li>
34 <li><a href="#3.23 Should I run timed on my A"> 3.23 Should I run timed on my AFS client?</a></li>
35 <li><a href="#3.24 Why should I keep /usr/vic"> 3.24 Why should I keep /usr/vice/etc/CellServDB current?</a></li>
36 <li><a href="#3.25 How can I keep /usr/vice/e"> 3.25 How can I keep /usr/vice/etc/CellServDB current?</a></li>
37 <li><a href="#3.26 How can I compute a list o"> 3.26 How can I compute a list of AFS fileservers?</a></li>
38 <li><a href="#3.27 How can I set up anonymous"> 3.27 How can I set up anonymous FTP login to access /afs?</a></li>
39 <li><a href="#3.28 Is the data sent over the n"> 3.28 Is the data sent over the network encrypted in AFS ?</a></li>
40 <li><a href="#3.29 What underlying filesystems"> 3.29 What underlying filesystems can I use for AFS ?</a></li>
41 <li><a href="#3.30 Compiling _OpenAFS"> 3.30 Compiling OpenAFS</a></li>
42 <li><a href="#3.31 Upgrading _OpenAFS"> 3.31 Upgrading OpenAFS</a></li>
43 <li><a href="#3.32 Debugging _OpenAFS"> 3.32 Debugging OpenAFS</a></li>
44 <li><a href="#3.33 Tuning client cache for hug"> 3.33 Tuning client cache for huge data</a></li>
45 <li><a href="#3.34 Settting up PAM with AFS"> 3.34 Settting up PAM with AFS</a></li>
46 <li><a href="#3.35 Setting up AFS key in KDC a"> 3.35 Setting up AFS key in KDC and KeyFile</a></li>
47 <li><a href="#3.36 Obtaining and getting asetk"> 3.36 Obtaining and getting asetkey compiled</a></li>
48 <li><a href="#3.37 afs_krb_get_lrealm() using"> 3.37 afs_krb_get_lrealm() using /usr/afs/etc/krb.conf</a></li>
49 <li><a href="#3.38 Moving from kaserver to Hei"> 3.38 Moving from kaserver to Heimdal KDC</a></li>
50 <li><a href="#3.39 Moving from KTH-KRB4 to Hei"> 3.39 Moving from KTH-KRB4 to Heimdal KDC</a></li>
51 <li><a href="#3.40 What are those bos(1) -type"> 3.40 What are those bos(1) -type values simple and cron?</a></li>
52 <li><a href="#3.41 KDC listens on port 88 inst"> 3.41 KDC listens on port 88 instead of 750</a></li>
53 <li><a href="#3.42 afsd gives me "Error -1 in"> 3.42 afsd gives me "Error -1 in basic initialization." on startup</a></li>
54 <li><a href="#3.43 Although I get krb tickets,"> 3.43 Although I get krb tickets, afslog doesn't give me tokens, I see UDP packets to port 4444</a></li>
55 <li><a href="#3.44 I get error message trhough"> 3.44 I get error message trhough syslogd: "afs: Tokens for user of AFS id 0 for cell foo.bar.baz are discarded (rxkad error=19270407)"</a></li>
56 <li><a href="#3.45 I get tickets and tokens, b"> 3.45 I get tickets and tokens, but still get Permission denied.</a></li>
57 <li><a href="#3.46 Recovering broken afs cache"> 3.46 Recovering broken afs cache on clients</a></li>
67 ### <a name="3.01 Is there a version of xdm"></a><a name="3.01 Is there a version of xdm "></a> 3.01 Is there a version of xdm available with AFS authentication?
69 Yes, xdm can be found in:
71 <file:///afs/transarc.com/public/afs-contrib/tools/xdm> <ftp://ftp.transarc.com/pub/afs-contrib/tools/xdm/MANIFEST>
73 ### <a name="3.02 Is there a version of xloc"></a> 3.02 Is there a version of xlock available with AFS authentication?
75 Yes, xlock can be found in:
77 <file:///afs/transarc.com/public/afs-contrib/tools/xlock> <ftp://ftp.transarc.com/pub/afs-contrib/tools/xlock/MANIFEST>
79 ### <a name="3.03 What is /afs/@cell?"></a> 3.03 What is /afs/@cell?
81 It is a symbolic link pointing at /afs/$your\_cell\_name.
83 NB, @cell is not something that is provided by AFS. You may decide it is useful in your cell and wish to create it yourself.
85 /afs/@cell is useful because:
87 - If you look after more than one AFS cell, you could create the link in each cell then set your PATH as:
88 - PATH=$PATH:/afs/@cell/@sys/local/bin
90 - For most cells, it shortens the path names to be typed in thus reducing typos and saving time.
92 A disadvantage of using this convention is that when you cd into /afs/@cell then type "pwd" you see "/afs/@cell" instead of the full name of your cell. This may appear confusing if a user wants to tell a user in another cell the pathname to a file.
94 You could create your own /afs/@cell with the following:
98 [ -L /afs/@cell ] && echo We already have @cell! && exit
99 cell=$(cat /usr/vice/etc/ThisCell)
100 cd /afs/.${cell} && fs mkm temp root.afs
102 ln -s /afs/${cell} @cell
103 ln -s /afs/.${cell} .@cell # .@cell for RW path
104 cd /afs/.${cell} && fs rmm temp
105 vos release root.afs; fs checkv
107 <http://www-archive.stanford.edu/lists/info-afs/hyper95/0298.html>
109 ### <a name="3.04 Given that AFS data is loc"></a> 3.04 Given that AFS data is location independent, how does an AFS client determine which server houses the data its user is attempting to access?
111 The Volume Location Database (VLDB) is stored on AFS Database Servers and is ideally replicated across 3 or more Database Server machines. Replication of the Database ensures high availability and load balances the requests for the data. The VLDB maintains information regarding the current physical location of all volume data (files and directories) in the cell, including the IP address of the [[FileServer]], and the name of the disk partition the data is stored on.
113 A list of a cell's Database Servers is stored on the local disk of each AFS Client machine as: /usr/vice/etc/CellServDB
115 The Database Servers also house the Kerberos Authentication Database (encrypted user and server passwords), the Protection Database (user UID and protection group information) and the Backup Database (used by System Administrators to backup AFS file data to tape).
117 ### <a name="3.05 How does AFS maintain cons"></a> 3.05 How does AFS maintain consistency on read-write files?
119 AFS uses a mechanism called "callback".
121 Callback is a promise from the fileserver that the cache version of a file/directory is up-to-date. It is established by the fileserver with the caching of a file.
123 When a file is modified the fileserver breaks the callback. When the user accesses the file again the Cache Manager fetches a new copy if the callback has been broken.
125 The following paragraphs describe AFS callback mechanism in more detail:
127 If I open() fileA and start reading, and you then open() fileA, write() a change **\*\*and close() or fsync()\*\*** the file to get your changes back to the server - at the time the server accepts and writes your changes to the appropriate location on the server disk, the server also breaks callbacks to all clients to which it issued a copy of fileA.
129 So my client receives a message to break the callback on fileA, which it dutifully does. But my application (editor, spreadsheet, whatever I'm using to read fileA) is still running, and doesn't really care that the callback has been broken.
131 When something causes the application to read() more of the file the read() system call executes AFS cache manager code via the VFS switch, which does check the callback and therefore gets new copies of the data.
133 Of course, the application may not re-read data that it has already read, but that would also be the case if you were both using the same host. So, for both AFS and local files, I may not see your changes.
135 Now if I exit the application and start it again, or if the application does another open() on the file, then I will see the changes you've made.
137 This information tends to cause tremendous heartache and discontent - but unnecessarily so. People imagine rampant synchronization problems. In practice this rarely happens and in those rare instances, the data in question is typically not critical enough to cause real problems or crashing and burning of applications. Since 1985, we've found that the synchronization algorithm has been more than adequate in practice - but people still like to worry!
139 The source of worry is that, if I make changes to a file from my workstation, your workstation is not guaranteed to be notified until I close or fsync the file, at which point AFS guarantees that your workstation will be notified. This is a significant departure from NFS, in which no guarantees are provided.
141 Partially because of the worry factor and largely because of Posix, this will change in DFS. DFS synchronization semantics are identical to local file system synchronization.
143 [ DFS is the Distributed File System which is part of the Distributed ] [ Computing Environment (DCE). ]
145 ### <a name="3.06 Which protocols does AFS u"></a> 3.06 Which protocols does AFS use?
147 AFS may be thought of as a collection of protocols and software processes, nested one on top of the other. The constant interaction between and within these levels makes AFS a very sophisticated software system.
149 At the lowest level is the UDP protocol, which is part of TCP/IP. UDP is the connection to the actual network wire. The next protocol level is the remote procedure call (RPC). In general, RPCs allow the developer to build applications using the client/server model, hiding the underlying networking mechanisms. AFS uses Rx, an RPC protocol developed specifically for AFS during its development phase at Carnegie Mellon University.
151 Above the RPC is a series of server processes and interfaces that all use Rx for communication between machines. Fileserver, volserver, upserver, upclient, and bosserver are server processes that export RPC interfaces to allow their user interface commands to request actions and get information. For example, a bos status command will examine the bos server process on the indicated file server machine.
153 Database servers use ubik, a replicated database mechanism which is implemented using RPC. Ubik guarantees that the copies of AFS databases of multiple server machines remain consistent. It provides an application programming interface (API) for database reads and writes, and uses RPCs to keep the database synchronized. The database server processes, vlserver, kaserver, and ptserver, reside above ubik. These processes export an RPC interface which allows user commands to control their operation. For instance, the pts command is used to communicate with the ptserver, while the command klog uses the kaserver's RPC interface.
155 Some application programs are quite complex, and draw on RPC interfaces for communication with an assortment of processes. Scout utilizes the RPC interface to file server processes to display and monitor the status of file servers. The uss command interfaces with kaserver, ptserver, volserver and vlserver to create new user accounts.
157 The Cache Manager also exports an RPC interface. This interface is used principally by file server machines to break callbacks. It can also be used to obtain Cache Manager status information. The program cmdebug shows the status of a Cache Manager using this interface.
159 For additional information, Section 1.5 of the AFS System Administrator's Guide and the April 1990 Cache Update contain more information on ubik. Udebug information and short descriptions of all debugging tools were included in the January 1991 Cache Update. Future issues will discuss other debugging tools in more detail.
161 [ source: <ftp://ftp.transarc.com/pub/afsug/newsletter/apr91> ] [ Copyright 1991 Transarc Corporation ]
163 ### <a name="3.07 Which TCP/IP ports and pro"></a> 3.07 Which TCP/IP ports and protocols do I need to enable in order to operate AFS through my Internet firewall?
165 Assuming you have already taken care of nameserving, you may wish to use an Internet timeserver for Network Time Protocol [[[NTP|Main/FurtherReading#NTP]]] and the question about [[timed|Main/WebHome#NTP]]:
169 A list of NTP servers is available via anonymous FTP from:
171 - <http://www.eecis.udel.edu/~mills/ntp/servers.html>
173 For further details on NTP see: <http://www.eecis.udel.edu/~ntp/>
175 For a "minimal" AFS service which does not allow inbound or outbound klog:
177 cachemanager 4711/udp (only if you use the arla-client instead of OpenAFS)
179 cachemanager 7001/udp
187 (Ports in the 7020-7029 range are used by the AFS backup system, and won't be needed by external clients performing simple file accesses.)
189 Additionally, for "klog" to work through the firewall you need to allow inbound and outbound UDP on ports >1024 (probably 1024<port<2048 would suffice depending on the number of simultaneous klogs).
191 See also: <http://www-archive.stanford.edu/lists/info-afs/hyper95/0874.html>
193 ### <a name="3.08 Are setuid programs execut"></a> 3.08 Are setuid programs executable across AFS cell boundaries?
195 By default, the setuid bit is ignored but the program may be run (without setuid privilege).
197 It is possible to configure an AFS client to honour the setuid bit. This is achieved by root running:
199 root@toontown # fs setcell -cell $cellname -suid
201 (where $cellname is the name of the foreign cell. Use with care!).
203 NB: making a program setuid (or setgid) in AFS does **not** mean that the program will get AFS permissions of a user or group. To become AFS authenticated, you have to klog. If you are not authenticated, AFS treats you as "system:anyuser".
205 ### <a name="3.09 How can I run daemons with"></a> 3.09 How can I run daemons with tokens that do not expire?
207 It is not a good idea to run with tokens that do not expire because this would weaken one of the security features of Kerberos.
209 A better approach is to re-authenticate just before the token expires.
211 There are two examples of this that have been contributed to afs-contrib. The first is "reauth":
213 - <file:///afs/transarc.com/public/afs-contrib/tools/reauth/>
214 - <ftp://ftp.transarc.com/pub/afs-contrib/tools/reauth/MANIFEST>
215 - <ftp://ftp.andrew.cmu.edu/pub/AFS-Tools/reauth-0.0.5.tar.gz>
219 <file:///afs/transarc.com/public/afs-contrib/pointers/UMich-lat-authenticated-batch-jobs> <ftp://ftp.transarc.com/pub/afs-contrib/pointers/UMich-lat-authenticated-batch-jobs>
221 Another collection of tools was [mentioned](https://lists.openafs.org/pipermail/openafs-info/2002-October/006353.html) by [[DanielClark]]:
223 Another option is [OpenPBS](http://www.openpbs.org/) and [Password Storage and Retrieval](http://www.lam-mpi.org/software/psr/) (PSR), where you encrypt your AFS password with a public key and put it in your home directory, and trusted machine(s) which have the private key on local disk then decrypt your password and run your job. MIT uses a variant of this (e.g. [a](http://web.mit.edu/longjobs/www/) & [b](http://mit.edu/longjobs-dev/notebook/)) that uses their own code (see [longjobs documentation](http://web.mit.edu/longjobs-dev/doc/netsec.txt) sections III and IV) instead of PSR.
225 ### <a name="3.10 Can I check my user's pass"></a> 3.10 Can I check my user's passwords for security purposes?
227 Yes. Alec Muffett's Crack tool (at version 4.1f) has been converted to work on the Transarc kaserver database. This modified Crack (AFS Crack) is available via anonymous ftp from:
229 - <ftp://export.acs.cmu.edu/pub/crack.tar.Z>
230 - <ftp://ftp.andrew.cmu.edu/pub/AFS-Tools/crack.tar.Z>
232 and is known to work on: pmax\_\* sun4\*\_\* hp700\_\* rs\_aix\* next\_\*
234 It uses the file /usr/afs/db/kaserver.DB0, which is the database on the kaserver machine that contains the encrypted passwords. As a bonus, AFS Crack is usually two to three orders of magnitude faster than the standard Crack since there is no concept of salting in a Kerberos database.
236 On a normal UNIX /etc/passwd file, each password can have been encrypted around 4096 (2^12) different saltings of the crypt(3) algorithm, so for a large number of users it is easy to see that a potentially large (up to 4095) number of seperate encryptions of each word checked has been avoided.
238 Author: Dan Lovinger Contact: Derrick J. Brashear <shadow+@andrew.cmu.edu>
240 <table border="1" cellpadding="0" cellspacing="0">
243 <td> AFS Crack does not work for MIT Kerberos Databases. The author is willing to give general guidance to someone interested in doing the (probably minimal) amount of work to port it to do MIT Kerberos. The author does not have access to a MIT Kerberos server to do this. </td>
247 ### <a name="3.11 Is there a way to automati"></a> 3.11 Is there a way to automatically balance disk usage across fileservers?
249 Yes. There is a tool, balance, which does exactly this. It can be retrieved via anonymous ftp from:
251 - <ftp://ftp.andrew.cmu.edu/pub/AFS-Tools/balance-1.1b.tar.gz>
253 Actually, it is possible to write arbitrary balancing algorithms for this tool. The default set of "agents" provided for the current version of balance balance by usage, # of volumes, and activity per week, the latter currently requiring a source patch to the AFS volserver. Balance is highly configurable.
255 Author: Dan Lovinger Contact: Derrick Brashear <shadow+@andrew.cmu.edu>
257 ### <a name="3.12 Can I shutdown an AFS file"></a> 3.12 Can I shutdown an AFS fileserver without affecting users?
259 Yes, this is an example of the flexibility you have in managing AFS.
261 Before attempting to shutdown an AFS fileserver you have to make some arrangements that any services that were being provided are moved to another AFS fileserver:
263 1. Move all AFS volumes to another fileserver. (Check you have the space!) This can be done "live" while users are actively using files in those volumes with no detrimental effects.
265 1. Make sure that critical services have been replicated on one (or more) other fileserver(s). Such services include:
266 - kaserver - Kerberos Authentication server
267 - vlserver - Volume Location server
268 - ptserver - Protection server
269 - buserver - Backup server
271 It is simple to test this before the real shutdown by issuing:
273 bos shutdown $server $service
275 where: $server is the name of the server to be shutdown
276 and $service is one (or all) of: kaserver vlserver ptserver buserver
278 Other points to bear in mind:
280 - "vos remove" any RO volumes on the server to be shutdown. Create corresponding RO volumes on the 2nd fileserver after moving the RW. There are two reasons for this:
281 1. An RO on the same partition ("cheap replica") requires less space than a full-copy RO.
282 2. Because AFS always accesses RO volumes in preference to RW, traffic will be directed to the RO and therefore quiesce the load on the fileserver to be shutdown.
284 - If the system to be shutdown has the lowest IP address there may be a brief delay in authenticating because of timeout experienced before contacting a second kaserver.
286 ### <a name="3.13 How can I set up mail deli"></a> 3.13 How can I set up mail delivery to users with $HOMEs in AFS?
288 There are many ways to do this. Here, only two methods are considered:
290 Method 1: deliver into local filestore
292 This is the simplest to implement. Set up your mail delivery to append mail to /var/spool/mail/$USER on one mailserver host. The mailserver is an AFS client so users draw their mail out of local filestore into their AFS $HOME (eg: inc).
294 Note that if you expect your (AFS unauthenticated) mail delivery program to be able to process .forward files in AFS $HOMEs then you need to add "system:anyuser rl" to each $HOMEs ACL.
298 - Simple to implement and maintain.
299 - No need to authenticate into AFS.
303 - It doesn't scale very well.
304 - Users have to login to the mailserver to access their new mail.
305 - Probably less secure than having your mailbox in AFS.
306 - System administrator has to manage space in /var/spool/mail.
308 Method 2: deliver into AFS
310 This takes a little more setting up than the first method.
312 First, you must have your mail delivery daemon AFS authenticated (probably as "postman"). The reauth example in afs-contrib shows how a daemon can renew its token. You will also need to setup the daemon startup soon after boot time to klog (see the -pipe option).
314 Second, you need to set up the ACLs so that "postman" has lookup rights down to the user's $HOME and "lik" on $HOME/Mail.
318 - Scales better than first method.
319 - Delivers to user's $HOME in AFS giving location independence.
320 - Probably more secure than first method.
321 - User responsible for space used by mail.
325 - More complicated to set up.
326 - Need to correctly set ACLs down to $HOME/Mail for every user.
327 - Probably need to store postman's password in a file so that the mail delivery daemon can klog after boot time. This may be OK if the daemon runs on a relatively secure host.
329 An example of how to do this for IBM RISC System/6000 is auth-sendmail. A beta test version of auth-sendmail can be found in:
331 <file:///afs/transarc.com/public/afs-contrib/doc/faq/auth-sendmail.tar.Z> <ftp://ftp.transarc.com/pub/afs-contrib/doc/faq/auth-sendmail.tar.Z>
333 ### <a name="3.14 Should I replicate a _Read"></a> 3.14 Should I replicate a [[ReadOnly]] volume on the same partition and server as the [[ReadWrite]] volume?
335 Yes, Absolutely! It improves the robustness of your served volumes.
337 If [[ReadOnly]] volumes exist (note use of term **exist** rather than **are available**), Cache Managers will **never** utilize the [[ReadWrite]] version of the volume. The only way to access the RW volume is via the "dot" path (or by special mounting).
339 This means if **all** RO copies are on dead servers, are offline, are behind a network partition, etc, then clients will not be able to get the data, even if the RW version of the volume is healthy, on a healthy server and in a healthy network.
341 However, you are **very** strongly encouraged to keep one RO copy of a volume on the **same server and partition** as the RW. There are two reasons for this:
343 1. The RO that is on the same server and partition as the RW is a clone (just a copy of the header - not a full copy of each file). It therefore is very small, but provides access to the same set of files that all other (full copy) [[ReadOnly]] volume do. Transarc trainers refer to this as the "cheap replica".
344 2. To prevent the frustration that occurs when all your ROs are unavailable but a perfectly healthy RW was accessible but not used.
346 If you keep a "cheap replica", then by definition, if the RW is available, one of the RO's is also available, and clients will utilize that site.
348 ### <a name="3.15 Should I start AFS before"></a><a name="3.15 Should I start AFS before "></a> 3.15 Should I start AFS before NFS in /etc/inittab?
350 Yes, it is possible to run both AFS and NFS on the same system but you should start AFS first.
352 In IBM's AIX 3.2, your /etc/inittab would contain:
354 rcafs:2:wait:/etc/rc.afs > /dev/console 2>&1 # Start AFS daemons
355 rcnfs:2:wait:/etc/rc.nfs > /dev/console 2>&1 # Start NFS daemons
357 With AIX, you need to load NFS kernel extensions before the AFS KEs in /etc/rc.afs like this:
360 # example /etc/rc.afs for an AFS fileserver running AIX 3.2
362 echo "Installing NFS kernel extensions (for AFS+NFS)"
363 /etc/gfsinstall -a /usr/lib/drivers/nfs.ext
364 echo "Installing AFS kernel extensions..."
365 D=/usr/afs/bin/dkload
366 ${D}/cfgexport -a ${D}/export.ext
367 ${D}/cfgafs -a ${D}/afs.ext
368 /usr/afs/bin/bosserver &
370 ### <a name="3.16 Will AFS run on a multi-ho"></a> 3.16 Will AFS run on a multi-homed fileserver?
372 (multi-homed = host has more than one network interface.)
374 Yes, it will. However, AFS was designed for hosts with a single IP address. There can be problems if you have one host name being resolved to several IP addresses.
376 Transarc suggest designating unique hostnames for each network interface. For example, a host called "spot" has two tokenring and one ethernet interfaces: spot-tr0, spot-tr1, spot-en0. Then, select which interface will be used for AFS and use that hostname in the [[CellServDB]] file (eg: spot-tr0).
378 You also have to remember to use the AFS interface name with any AFS commands that require a server name (eg: vos listvol spot-tr0).
380 There is a more detailed discussion of this in the August 1993 issue of "Cache Update" (see: <ftp://ftp.transarc.com/pub/afsug/newsletter/aug93>).
382 The simplest way of dealing with this is to make your AFS fileservers single-homed (eg only use one network interface).
384 At release 3.4 of AFS, it is possible to have multi-homed fileservers (but _not_ multi-homed database servers).
386 ### <a name="3.17 Can I replicate my user's"></a><a name="3.17 Can I replicate my user's "></a> 3.17 Can I replicate my user's home directory AFS volumes?
390 Users with $HOMEs in /afs normally have an AFS [[ReadWrite]] volume mounted in their home directory.
392 You can replicate a RW volume but only as a [[ReadOnly]] volume and there can only be one instance of a [[ReadWrite]] volume.
394 In theory, you could have RO copies of a user's RW volume on a second server but in practice this won't work for the following reasons:
396 a) AFS has built-in bias to always access the RO copy of a RW volume.
397 So the user would have a ReadOnly $HOME which is not too useful!
399 b) Even if a) was not true you would have to arrange frequent
400 synchronisation of the RO copy with the RW volume (for example:
401 "vos release user.fred; fs checkv") and this would have to be
402 done for all such user volumes.
404 c) Presumably, the idea of replicating is to recover the $HOME
405 in the event of a server crash. Even if a) and b) were not
406 problems consider what you might have to do to recover a $HOME:
408 1) Create a new RW volume for the user on the second server
409 (perhaps named "user.fred.2").
411 2) Now, where do you mount it?
413 The existing mountpoint cannot be used because it already has
414 the ReadOnly copy of the original volume mounted there.
416 Let's choose: /afs/MyCell/user/fred.2
418 3) Copy data from the RO of the original into the new RW volume
421 4) Change the user's entry in the password file for the new $HOME:
422 /afs/MyCell/user/fred.2
424 You would have to attempt steps 1 to 4 for every user who had
425 their RW volume on the crashed server. By the time you had done
426 all of this, the crashed server would probably have rebooted.
428 The bottom line is: you cannot replicate $HOMEs across servers.
430 ### <a name="3.18 What is the Andrew Benchma"></a> 3.18 What is the Andrew Benchmark?
432 "It is a script that operates on a collection of files constituting an application program. The operations are intended to represent typical actions of an average user. The input to the benchmark is a source tree of about 70 files. The files total about 200 KB in size. The benchmark consists of five distinct phases:
434 I MakeDir - Construct a target subtree that is identical to the
436 II Copy - Copy every file from the source subtree to the target subtree.
437 III ScanDir - Traverse the target subtree and examine the status
439 IV ReadAll - Scan every byte of every file in the target subtree.
440 V Make - Complete and link all files in the target subtree."
442 Source: <file:///afs/transarc.com/public/afs-contrib/doc/benchmark/Andrew.Benchmark.ps> <ftp://ftp.transarc.com/pub/afs-contrib/doc/benchmark/Andrew.Benchmark.ps>
444 ### <a name="3.19 Where can I find the Andre"></a> 3.19 Where can I find the Andrew Benchmark?
446 From Daniel Joseph Barnhart Clark's [message](http://lists.openafs.org/pipermail/openafs-info/2004-April/012942.html):
448 It's linked to from <http://www.citi.umich.edu/projects/linux-scalability/tools.html>; CITI also has some useful mods at <http://www.citi.umich.edu/projects/nfs-perf/results/cmarion/>.
450 ### <a name="3.20 Is there a version of HP V"></a> 3.20 Is there a version of HP VUE login with AFS authentication?
452 Yes, the availability of this is described in: <file:///afs/transarc.com/public/afs-contrib/pointers/HP-VUElogin.txt> <ftp://ftp.transarc.com/pub/afs-contrib/pointers/HP-VUElogin.txt>
454 If you don't have access to the above, please contact Rajeev Pandey of Hewlett Packard whose email address is <rpandey@cv.hp.com>.
456 ### <a name="3.21 How can I list which clien"></a> 3.21 How can I list which clients have cached files from a server?
458 By using the following script:
463 # AUTHOR Rainer Toebbicke <rtb@dxcern.cern.ch>
465 # PURPOSE Display AFS clients which have grabbed files from a server
468 echo "Usage: $0 <afs_server 1> ... <afsserver n>"
472 /usr/afsws/etc/rxdebug -servers $n -allconn
473 done | grep '^Connection' | \
474 while read x y z ipaddr rest; do echo $ipaddr; done | sort -u |
475 while read ipaddr; do
477 n="`nslookup $ipaddr`"
485 ### <a name="3.22 Do Backup volumes require"></a><a name="3.22 Do Backup volumes require "></a> 3.22 Do Backup volumes require as much space as [[ReadWrite]] volumes?
489 The technique used is to create a new volume, where every file in the RW copy is pointed to by the new backup volume. The files don't exist in the BK, only in the RW volume. The backup volume therefore takes up very little space.
491 If the user now starts modifying data, the old copy must not be destroyed.
493 There is a Copy-On-Write bit in the vnode - if the fileserver writes to a vnode with the bit on it allocates a new vnode for the data and turns off the COW bit. The BK volume hangs onto the old data, and the RW volume slowly splits itself away over time.
495 The BK volume is re-synchronised with the RW next time a "vos backupsys" is run.
497 The space needed for the BK volume is directly related to the size of all files changed in the RW between runs of "vos backupsys".
499 ### <a name="3.23 Should I run timed on my A"></a> 3.23 Should I run timed on my AFS client?
503 <a name="NTP"></a> The AFS Servers make use of NTP [[[NTP|Main/FurtherReading#NTP]]] to synchronise time each other and typically with one or more external NTP servers. By default, clients synchronize their time with one of the servers in the local cell. Thus all the machines participating in the AFS cell have an accurate view of the time.
505 For further details on NTP see: <http://www.eecis.udel.edu/~ntp/>. The latest version is 4.1, dated August 2001, which is **much** more recent that the version packaged with Transarc AFS.
507 A list of NTP servers is available via anonymous FTP from:
509 - <http://www.eecis.udel.edu/~mills/ntp/servers.html>
511 The default time setting behavior of the AFS client can be disabled by specifying the `-nosettime` argument to [afsd](http://www.transarc.ibm.com/Library/documentation/afs/3.5/unix/cmd/cmd53.htm). This is recommended for AFS servers which are also configured as clients (because servers normally run NTP daemons) and for clients that run NTP.
513 ### <a name="3.24 Why should I keep /usr/vic"></a> 3.24 Why should I keep /usr/vice/etc/CellServDB current?
515 On AFS clients, /usr/vice/etc/CellservDB, defines the cells and (their servers) that can be accessed via /afs.
517 Over time, site details change: servers are added/removed or moved onto new network addresses. New sites appear.
519 In order to keep up-to-date with such changes, the [[CellservDB]] file on each AFS client should be kept consistent with some master copy (at your site).
521 As well as updating [[CellservDB]], your AFS administrator should ensure that new cells are mounted in your cell's root.afs volume.
523 If a cell is added to [[CellServDB]] then the **client** must either be restared or you must the AFS command "fs newcell -cell .. -servers ... ...".
525 ### <a name="3.25 How can I keep /usr/vice/e"></a> 3.25 How can I keep /usr/vice/etc/CellServDB current?
527 Do a daily copy from a master source and update the AFS kernel sitelist.
529 One good master source is the grand.central.org [[CellServDB]], available from <http://grand.central.org/dl/cellservdb/CellServDB> or <file:/afs/openafs.org/service/CellServDB> (N.B. update to /afs/grand.central.org path when available). You can send updates for this to <cellservdb@central.org>.
531 The client [[CellServDB]] file must not reside under /afs and is best located in local filespace.
533 Simply updating a client [[CellServDB]] file is not enough. You also need to update the AFS kernel sitelist by either: 1 rebooting the client or 1 running "fs newcell $cell\_name $server\_list" for each site in the [[CellServDB]] file.
535 A script to update the AFS kernel sitelist on a running system is newCellServDB.
537 <file:///afs/ece.cmu.edu/usr/awk/Public/newCellServDB> <ftp://ftp.ece.cmu.edu/pub/afs-tools/newCellServDB>
539 One way to distribute [[CellServDB]] is to have a root cron job on each AFS client copy the file then run newCellServDB.
545 # NAME syncCellServDB
546 # PURPOSE Update local CellServDB file and update AFS kernel sitelist
547 # USAGE run by daily root cron job eg:
548 # 0 3 * * * /usr/local/sbin/syncCellServDB
550 # NOTE "@cell" is a symbolic link to /afs/$this_cell_name
552 src=/afs/@cell/service/etc/CellServDB
553 dst=/usr/vice/etc/CellServDB
554 xec=/usr/local/sbin/newCellServDB
555 log=/var/log/syncCellServDB
557 if [ -s ${src} ]; then
558 if [ ${src} -nt ${dst} ]; then
559 cp $dst ${dst}- && cp $src $dst && $xec 2>&1 >$log
561 echo "master copy no newer: no processing to be done" >$log
564 echo "zero length file: ${src}" >&2
567 ### <a name="3.26 How can I compute a list o"></a> 3.26 How can I compute a list of AFS fileservers?
569 Here is a Bourne shell command to do it (it will work in GNU bash and the Korn shell, too):
571 stimpy@nick $ vos listvldb -cell `cat /usr/vice/etc/ThisCell` \\
572 | awk '(/server/) {print $2}' | sort -u
574 ### <a name="3.27 How can I set up anonymous"></a> 3.27 How can I set up anonymous FTP login to access /afs?
576 The easiest way on a primarily "normal" machine (where you don't want to have everything in AFS) is to actually mount root.cell under ~ftp, and then symlink /afs to ~ftp/afs or whatever. It's as simple as changing the mountpoint in /usr/vice/etc/cacheinfo and restarting afsd.
578 Note that when you do this, anon ftp users can go anywhere system:anyuser can (or worse, if you're using IP-based ACLs and the ftp host is PTS groups). The only "polite" solution I've arrived at is to have the ftp host machine run a minimal [[CellServDB]] and police my ACLs tightly.
580 Alternatively, you can make ~ftp an AFS volume and just mount whatever you need under that - this works well if you can keep everything in AFS, and you don't have the same problems with anonymous "escapes" into /afs.
582 Unless you need to do authenticating ftp, you are _strongly_ recommended using wu-ftpdv2.4 (or better).
584 ### <a name="3.28 Is the data sent over the n"></a> 3.28 Is the data sent over the network encrypted in AFS ?
586 There is still no easy way to do this in Transarc AFS, but [[OpenAFS]] now has a "fs" subcommand to turn on encryption of regular file data sent and received by a client. This is a per client setting that persist until reboot. No server actions are needed to support this change. The syntax is:
592 Note that this only encrypts network traffic between the client and server. The data on the server's disk is not encrypted nor is the data in the client's disk cache. The encryption algorithm used is [fcrypt](http://tedanderson.home.mindspring.com/fcrypt-paper.txt), which is a DES variant.
594 Getting encryption enabled by default:
596 - [[RedHat]] Linux: ([src](https://lists.openafs.org/pipermail/openafs-info/2002-July/005085.html)) change the last line of /etc/sysconfig/afs to `AFS_POST_INIT="/usr/bin/fs setcrypt on"`
597 - Windows ([src](https://lists.openafs.org/pipermail/openafs-info/2003-June/009416.html)) set the following registry value named `SecurityLevel` under `HKLM\SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters` to 2.
599 I have not tested either of these procedures. -- [[TedAnderson]] - 05 Jun 2003
601 ### <a name="3.29 What underlying filesystems"></a> 3.29 What underlying filesystems can I use for AFS ?
603 See also [[SupportedConfigurations]].
605 You need to distinguish between the filesystem used by the file server to store the actual AFS data (by convention in /vicep?) and the filesystem used by the client cache manager to cache files.
607 Fileserver is started by bosserver. It depends, what ./configure switches were used during compilation from sources. To be always on the safe side, use --enable-namei-fileserver configure flag. That will give you fileserver binary which can act on any /vicep? partition regardless it's filesystem type. With the new namei file server you can basically use any filesystem you want. The namei file server does not do any fancy stuff behind the scenes but only accesses normal files (their names are a bit strange though).
609 The opposite to namei fileserver is inode based nameserver. According to openafs-devel email list, it gave on some Solaris box 10% speedup over the namei based server. The namei based fileserver cannot run on every filesystem, as it stores some internal afs-specific data into the filesystem. Typically, /sbin/fsck distributed withthe operating system zaps these data. Inode based fileserver directly operates on the inodes of the underlying file system which therefore has to fully support the inode abstraction scheme. The the Administrators Guide for more details (they differ from system to system).
611 On the client side where you run /usr/afs/etc/afsd as a kernel process, you always have to use a file system supporting the inode abstraction for the cache (usually /usr/vice/cache) since the cache manager references files by their inode. Fortunately, it does not do such tricky stuff as the inode based fileserver.
613 The following file systems have been reported _not_ to work for the AFS client cache:
617 - advfs (Tru64), it works but gives cachecurruption
618 - efs (SGI) - IBM AFS does support efs, but openafs doesn't have a license for that.
620 - Patch committed to cvs around 6/2003 will now enforce this in some cases and generate a warning to the user if the filesystem type is wrong.
622 The following file systems have been reported to work for the AFS client cache:
627 - xfs (at least on IRIX 6.5)
628 - ufs (Solaris, [[Tru64Unix]])
630 ### <a name="3.30 Compiling _OpenAFS"></a> 3.30 Compiling [[OpenAFS]]
632 The kernel parts on Solaris have to be compiled with Sun cc, same for other platforms, i.e. you need same compiler used to compile kernel to compile your afs modules. [[Tru64Unix]] doesn't support modules, so you have to edit kernel config files and link statically into kernel. Kernel module insertion works fine on Linux, Solaris, Irix ...
634 ./configure --enable-transarc-paths=/usr/etc --with-afs-sysname=i386_linux24
638 ... and continue the install process described in IBM AFS documentation. If you do "make install", you will end up with some stuff installed into /usr/local but something not, regardless the --enable-transarc-paths option ... "make install" it's messy.
640 ### <a name="3.31 Upgrading _OpenAFS"></a> 3.31 Upgrading [[OpenAFS]]
642 Upgrade of AFS on Linux
644 /etc/rc.d/init.d/afs stop
645 cd root.client/usr/vice/etc
646 tar cvf - . | (cd /usr/vice/etc; tar xfp -)
647 cp -p afs.rc /etc/rc.d/init.d/afs
648 cp ../../../../lib/pam_afs.krb.so.1 /lib/security
649 cd ../../../../root.server/usr/afs
650 tar cvf - . | (cd /usr/afs; tar xfp -)
651 # echo "auth sufficient /lib/security/pam_afs.so try_first_pass \
652 ignore_root" >> /etc/pam.d/login
654 vim /etc/sysconfig/afs
655 ln -s pam_afs.krb.so.1 pam_afs.so
657 ln -s ../init.d/afs S99afs
659 ln -s ../init.d/afs K01afs
660 cp /usr/vice/etc/afs.conf /etc/sysconfig/afs
661 /etc/rc.d/init.d/afs start
663 Upgrade of AFS on Solaris 2.6
668 cd root.server/usr/afs
669 tar cvf - ./bin | (cd /usr/afs; tar xfp -)
671 cp root.client/usr/vice/etc/modload/libafs.nonfs.o /kernel/fs/afs
672 cp root.server/etc/vfsck /usr/lib/fs/afs/fsck
673 cd root.client/usr/vice
674 tar cvf - ./etc | (cd /usr/vice; tar xf -)
676 cp lib/pam_afs.krb.so.1 /usr/lib/security
677 cp lib/pam_afs.so.1 /usr/lib/security
682 Upgrade of AFS on Irix 6.5
684 /etc/chkconfig -f afsserver off
685 /etc/chkconfig -f afsclient off
686 /etc/chkconfig -f afsml off
687 /etc/chkconfig -f afsxnfs off
689 cd root.server/usr/afs
690 tar cvf - ./bin | (cd /usr/afs; tar xfp -)
692 cp root.client/usr/vice/etc/sgiload/libafs.IP22.nonfs.o /usr/vice/etc/sgiload
693 echo "AFS will be compiled statically into kernel"
694 echo "otherwise skip following lines and use chkconfig afsml on"
695 cp root.client/bin/afs.sm /var/sysgen/system
696 cp root.client/bin/afs /var/sysgen/master.d
697 echo "The next file comes from openafs-*/src/libafs/STATIC.*"
698 cp root.client/bin/libafs.IP22.nonfs.a /var/sysgen/boot/afs.a
701 echo "end of static kernel modifications"
702 cd root.client/usr/vice/etc
703 echo "Delete any of the modload/ files which don't fit your platform if you need space"
704 echo "These files originate from openafs-*/src/libafs/MODLOAD.*"
705 tar cvf - . | (cd /usr/vice/etc; tar xf -)
706 /etc/chkconfig -f afsserver on
707 /etc/chkconfig -f afsclient on
708 # /etc/chkconfig -f afsml on - afs is compiled statically into kernel, so leave afsml off
709 /etc/chkconfig -f afsml off
710 /etc/chkconfig -f afsxnfs off
713 Upgrade of AFS on [[Tru64Unix]]
715 cd root.server/usr/afs/
716 tar cvf - ./bin | (cd /usr/afs; tar xfp -)
717 cd ../../../root.client/bin
718 cp ./libafs.nonfs.o /usr/sys/BINARY/afs.mod
719 ls -la /usr/sys/BINARY/afs.mod
721 cd ../../root.client/usr/vice
722 cp etc/afsd /usr/vice/etc/afsd
723 cp etc/C/afszcm.cat /usr/vice/etc/C/afszcm.cat
725 ### <a name="3.32 Debugging _OpenAFS"></a> 3.32 Debugging [[OpenAFS]]
727 In case of troubles when you need only fileserver process to run (to be able to debug), run the lwp fileserver instead of the pthreads fileserver (src/viced/fileserver instead of src/tviced/fileserver if you have a buildtree handy):
729 cp src/viced/fileserver /usr/afs/bin (or wherever)
731 bos restart calomys fs -local
733 ... then attach with gdb
735 To debug if client running afsd kernel process talks to the servers from [[CellServDB]], do:
737 tcpdump -vv -s 1500 port 7001
741 fileserver 7000/udp # fileport (FILESERVICE)
742 afscb 7001/udp # kernel extensions
743 afsprot 7002/udp # ptserver (PROTSERVICE)
744 afsvldb 7003/udp # vlserver (VLDBSERVICE)
745 afskauth 7004/udp # kaserver (KAUTHSERVICE)
746 afsvol 7005/udp # volserver (VOLUMESERVICE)
747 afserror 7006/udp # ERRORSERVICE
748 afsnanny 7007/udp # bosserver (NANNYSERVICE)
749 afsupdate 7008/udp # upserver (UPDATESERVICE)
750 afsrmtsys 7009/udp # RMTSYSSERVICE
752 ### <a name="3.33 Tuning client cache for hug"></a> 3.33 Tuning client cache for huge data
754 Use on afsd command line -chunk 17 or greater. Be carefull, with certain cache sizes afsd crashes on startup (Linux, [[Tru64Unix]] at least). It is possibly when dcache is too small. Go for:
756 /usr/vice/etc/afsd -nosettime -stat 12384 -chunk 19
758 > So I ran the full suite of iozone tests (13), but at a single file
759 > size (128M) and one record size (64K). I set the AFS cache size to > 80000K for both memcache and diskcache.
761 Note that memcache size and diskcache size are different things.
762 In the case of memcache, a fixed number of chunks are allocated
763 in memory, such that numChunks * chunkSize = memCacheSize. In
764 the case of disk cache, there are a lot more chunks, because the
765 disk cache assumes not every chunk will be filled (the underlying
766 filesystem handles disk block allocation for us). Thus, when you
767 have small file segments, they use up an entire chunk worth of
768 cache in the memcache case, but only their size worth of cache
769 in the diskcache cache.
773 ### <a name="3.34 Settting up PAM with AFS"></a> 3.34 Settting up PAM with AFS
777 auth sufficient /lib/security/pam_afs.so debug try_first_pass ignore_root debug
778 auth required /lib/security/pam_env.so
779 auth sufficient /lib/security/pam_unix.so likeauth nullok
780 auth required /lib/security/pam_deny.so
782 account required /lib/security/pam_unix.so
784 password required /lib/security/pam_cracklib.so retry=3 type=
785 password sufficient /lib/security/pam_unix.so nullok use_authtok md5 shadow
786 password required /lib/security/pam_deny.so
788 session sufficient /lib/security/pam_afs.so set_token
789 session required /lib/security/pam_limits.so
790 session required /lib/security/pam_unix.so
792 # reafslog is to unlock dtlogin's screensaver
793 other auth sufficient /usr/athena/lib/pam_krb4.so reafslog
795 ### <a name="3.35 Setting up AFS key in KDC a"></a> 3.35 Setting up AFS key in KDC and [[KeyFile]]
797 The easiest method is not much recommended, as the password is possibly very weak:
799 dattan# bos addkey server -kvno <n+1>
803 dattan# kstring2key -c <cellname>
806 dattan# kadmin ckey afs
807 <cut-n-paste the ascii output from above>
809 Beware, there is currently a byte order bug in the kadmin tool as of May 2001 in KTH-KRB. If you run kadmin on a little indian machine (PC, Alpha, ...) you must swap the bytes manually. Here is a small example:
811 bg$ kstring2key -c sics.se
813 ascii = \361\334\211\221\221\206\325\334
814 hex = f1dc89919186d5dc
817 bg.admin@SICS.SE's Password:
818 New DES key for afs: \221\211\334\361\334\325\206\221
820 Please note how the bytes are swapped in groups of four.
822 This bug is fixed in an upcoming release.
824 Better approach is to create random key in KDC using "ksrvutil get" (rather then "ksrvutil add" which asks you for the new password), export it into /etc/srvtab ("ksrvutil ext") and from there copy it into /usr/afs/etc/KeyFile using asetkey utility from /afs/transarc.com/public/afs-contrib. After some years, you may wish to regenerate the random afs key using "ksrvutil change" in KDC and exporting it again.
826 There are two nice pages abou this:
828 <http://www.cs.cmu.edu/afs/andrew.cmu.edu/usr/shadow/www/afs/afs-with-kerberos.html> <http://www.contrib.andrew.cmu.edu/~shadow/afs/afs-with-kerberos.html>
830 As someone noted, you might need some ext\_srvtab utility to extract the key from /etc/srvtab, but I don't remeber that I needed it. Then he also suggets to use asetkey utility.
832 Create afs.natur\\.cuni\\.cz@NATUR.CUNI.CZ principal entry in kerberos:
835 principal instance: natur.cuni.cz
836 principal realm: NATUR.CUNI.CZ
838 Import this key from Kerberos (/etc/srvtab) into AFS /usr/afs/etc/KeyFile using asetkey utility, which is I think from /afs/transarc.com/public/afs-contrib
840 ./asetkey add 0 /etc/srvtab <afs.natur.cuni.cz@NATUR.CUNI.CZ>
842 This [[KeyFile]] with the AFS-key you can just always re-copy to new AFS **server** machines. Be sure that the key version number KVNO is always same in this [[KeyFile]] and in Kerberos database. On all these machines you of course need afs.hostname.REALM key loaded into their /etc/srvtab (create them with 'ksrvutil get'). It seems klog(1) needs afs@REALM, so copy the principal afs.cell.name@REALM to it.
844 You can test if you have same keys in kerberos and AFS like this:
849 If you have some tokens now, then it works and you can now shutdown kaserver. Users, which you have created in AFS under kaserver are in /usr/afs/db/kaserver.\*, but you can just forget them. Create these users again in Kerberos IV.
851 AFS users are then looked up in:
853 kerberos database (/var/kerberos/principal.db)
855 /usr/afs/etc/UserList (permission to manipulate 'bos')
857 system:administrators (permissions for vos, pts, fs, i.e. 'pts adduser' etc)
859 ---------------------------------------------------------------------------------
860 Another approach, untested:
862 http://www.natur.cuni.cz/~majordomo/krb4/krb4.9703/msg00002.html
864 Date: Tue, 9 May 2000 10:57:23 +0200 (MET DST)
865 From: Johan Hedin <johanh at fusion.kth.se>
866 To: Erland Fristedt <Erland.Fristedt@wcs.eraj.ericsson.se>
868 Subject: Re: AFS+KTH-KRB problem
870 This is a printout how we got it to work. Hope this helps.
874 callisto#/usr/athena/sbin/ksrvutil -p johanh.admin -f srvtab get
876 Instance [callisto]: fusion.kth.se
877 Realm [FUSION.KTH.SE]:
878 Is this correct? (y,n) [y]
879 Add more keys? (y,n) [n]
880 Password for johanh.admin@FUSION.KTH.SE:
881 Warning: Are you sure `fusion.kth.se' should not be `fusion'?
882 Added afs.fusion.kth.se@FUSION.KTH.SE
883 Old keyfile in srvtab.old.
884 callisto#/usr/athena/sbin/ksrvutil -p johanh.admin -f srvtab list
886 4 afs.fusion.kth.se@FUSION.KTH.SE
887 callisto#/tmp/asetkey add 4 srvtab afs.fusion.kth.se@FUSION.KTH.SE
889 callisto#bin/bos status callisto
890 Instance buserver, currently running normally.
891 Instance ptserver, currently running normally.
892 Instance vlserver, currently running normally.
893 Instance fs, currently running normally.
894 Auxiliary status is: file server running.
895 callisto#bin/fs la /afs
896 Access list for /afs is
899 system:administrators rlidwka
901 --------------------------------------------------------------------------------
902 > Tokens held by the Cache Manager:
904 > User's (AFS ID 6020) tokens for afs@sunrise.ericsson.se [Expires May 5
908 You got your tickets alright, but then
910 > > touch /afs/.sunrise.ericsson.se/tabort
911 > afs: Tokens for user of AFS id 6020 for cell sunrise.ericsson.se are
912 > discarded (rxkad error=19270407)
914 grep 19270407 /usr/afsws/include/rx/*
915 /usr/afsws/include/rx/rxkad.h:#define RXKADBADTICKET (19270407L)
917 so I would guess that the key version number and/or the key on your
918 AFS servers does not match the key of the afs principal.
920 Use klist -v to figure out about key version numbers and then use
922 $ kstring2key -c sunrise.ericsson.se
924 ascii = \242\345\345\260\323p\263\233
925 hex = a2e5e5b0d370b39b
927 or some other means to ensure that you use the same keys.
929 ### <a name="3.36 Obtaining and getting asetk"></a> 3.36 Obtaining and getting asetkey compiled
931 Better approach is to create random key in KDC, export it into /etc/srvtab and from there move in /usr/afs/etc/KeyFile using asetkey utility from /afs/transarc.com/public/afs-contrib
933 | I can not get asetkey to compile.
935 | asetkey.c: In function `main':
936 | asetkey.c:25: `AFSCONF_SERVERNAME' undeclared (first use in this function)
937 | asetkey.c:25: (Each undeclared identifier is reported only once
938 | asetkey.c:25: for each function it appears in.)
941 AFS 3.5 got rid of a few commonly-used AFS defines; I suspect they are now API calls of some kind, akin to the POSIX move from hardcoded constants to use of \{,f\}pathconf() and sysconf(). I have no idea what those calls are, though.
943 In the meantime, the following two defines are useful in building stuff on AFS 3.5:
945 #define AFSCONF_CLIENTNAME "/usr/vice/etc"
946 #define AFSCONF_SERVERNAME "/usr/afs/etc"
948 ### <a name="3.37 afs_krb_get_lrealm() using"></a><a name="3.37 afs_krb_get_lrealm() using "></a> 3.37 afs\_krb\_get\_lrealm() using /usr/afs/etc/krb.conf
950 In this file you can set also another REALM to be used by you afs server processes, if the REALM should differ from the system-wide REALM (
956 Don't forget it's related to these entries in Kerberos KDC:
959 krbtgt CELL.NAME@REALM
961 If you use heimdal (or MIT krb5), do:
963 echo "REALM" > /usr/afs/etc/krb.conf
965 ### <a name="3.38 Moving from kaserver to Hei"></a> 3.38 Moving from kaserver to Heimdal KDC
967 > While converting all our administration tools, we have discovered that
968 > the time a principal changed his/her/its password is _not_ carried over
969 > from the kaserver DB.
971 First of all, some Heimdal's configure flags:
975 requires krb4 libs, so for that you'll need a working krb4 are you still using a kaserver/kaserver emulation ?
979 is just for dumping a kaserver krb4 database. If you are no longer running a kaserver, you don't need it.
983 <https://lists.openafs.org/pipermail/openafs-info/2002-May/004326.html>
985 This works while migrating from kaserver:
987 /usr/heimdal/libexec/hprop --source=kaserver --cell=xxx
988 --kaspecials --stdout | /usr/heimdal/libexec/hpropd --no-inetd --stdin
990 This somewhat doesn't:
992 /usr/heimdal/libexec/hprop --source=kaserver --cell=xxx
993 --encrypt --master-key=<path to key> --kaspecials --stdout |
994 /usr/heimdal/libexec/hpropd --stdin
996 ### <a name="3.39 Moving from KTH-KRB4 to Hei"></a> 3.39 Moving from KTH-KRB4 to Heimdal KDC
998 /usr/heimdal/libexec/hprop -n -k /etc/krb5.keytab --source=krb4-dump -d /var/kerberos/dump.txt --master-key=/.k -D | /usr/heimdal/libexec/hpropd -n
1002 1. dump of the krb4 database with kdb_util
1003 2. dump of the "default" heimdal database with kadmin -l
1004 3. /usr/heimdal/libexec/hprop -n -k /etc/krb5.keytab --source=krb4-dump -d /usr/heimdal/libexec/hprop -n -k /etc/krb5.keytab --source=krb4-dump -d
1005 where /etc/krb5.keytab contains hprop/`hostname` keys
1006 4. merge of the converted database with file from (2) via kadmin
1008 The special thing for me is the use of "-D" in the (3) which seems to
1009 cause conversion des-cbc-sha1 keys of old krb4 database entries to
1012 ### <a name="3.40 What are those bos(1) -type"></a> 3.40 What are those bos(1) -type values simple and cron?
1014 Typically, admins do this once they configure new afs server:
1016 bos create foo ptserver simple /usr/afs/bin/ptserver -cell bar.baz
1017 bos create foo vlserver simple /usr/afs/bin/vlserver -cell bar.baz
1018 bos create foo fs fs /usr/afs/bin/fileserver /usr/afs/bin/volserver /usr/afs/bin/salvager -cell bar.baz
1020 Type "simple" has one process. type "cron" gets forked at the appropriate time.
1022 ### <a name="3.41 KDC listens on port 88 inst"></a> 3.41 KDC listens on port 88 instead of 750
1024 "Kramer, Matthew" <mattkr@bu.edu> writes:
1027 > Our Kerberos 4 environment listens on only port 750 and doesn't
1028 > listen on port 88. For Win2K/XP machines this causes a problem in
1029 > C:\openafs-1.2.8\src\kauth\user_nt.c line 144 when the Kerberos port is
1030 > queried from the %systemroot%\system32\drivers\etc\services file. Win2K
1031 > and XP both return 88 which is correct for Kerberos 5 but in our case
1032 > not for Kerberos 4. Why doesn't it instead query for kerberos-iv which
1033 > would return the correct value of 750?
1035 > Y:\src\kauth>diff user_nt.c.orig user_nt.c
1037 > < sp = getservbyname("kerberos", "udp");
1039 > > sp = getservbyname("kerberos-iv", "udp");
1041 A quick work around could be to use Loves requestforwarder found at
1043 ftp://ftp.stacken.kth.se/pub/projects/krb-forward/krb-forward-0.1.tar.gz
1047 ### <a name="3.42 afsd gives me "Error -1 in"></a><a name="3.42 afsd gives me "Error -1 in "></a> 3.42 afsd gives me "Error -1 in basic initialization." on startup
1049 When starting afsd, I get the following:
1051 # /usr/vice/etc/afsd -nosettime -debug
1052 afsd: My home cell is 'foo.bar.baz'
1053 ParseCacheInfoFile: Opening cache info file '/usr/vice/etc/cacheinfo'...
1054 ParseCacheInfoFile: Cache info file successfully parsed:
1055 cacheMountDir: '/afs'
1056 cacheBaseDir: '/usr/vice/cache'
1058 afsd: 5000 inode_for_V entries at 0x8075078, 20000 bytes
1059 SScall(137, 28, 17)=-1 afsd: Forking rx listener daemon.
1060 afsd: Forking rx callback listener.
1061 afsd: Forking rxevent daemon.
1062 SScall(137, 28, 48)=-1 SScall(137, 28, 0)=-1 SScall(137, 28, 36)=-1 afsd: Error -1 in basic initialization.
1064 Solution: make sure you have kernel module loaded.
1066 ### <a name="3.43 Although I get krb tickets,"></a> 3.43 Although I get krb tickets, afslog doesn't give me tokens, I see UDP packets to port 4444
1068 Using tcpdump I see the following traffic. What runs on the port 4444?
1070 15:16:54.815194 IP foo.bar.baz.32772 > foo.bar.baz.4444: UDP, length: 269
1071 15:16:54.815199 IP foo.bar.baz > foo.bar.baz: icmp 305: foo.bar.baz udp port 4444 unreachable
1073 This is the 5->4 ticket conversion service on UDP port 4444. Assuming your afs servers know how to deal with krb5 tickets (since openafs-1.2.10? and 1.3.6x?) include the following in /etc/krb5.conf:
1080 ### <a name="3.44 I get error message trhough"></a> 3.44 I get error message trhough syslogd: "afs: Tokens for user of AFS id 0 for cell foo.bar.baz are discarded (rxkad error=19270407)"
1084 grep 19270407 /usr/afsws/include/rx/*
1085 /usr/afsws/include/rx/rxkad.h:#define RXKADBADTICKET (19270407L)
1087 ### <a name="3.45 I get tickets and tokens, b"></a> 3.45 I get tickets and tokens, but still get Permission denied.
1089 Answer: /usr/afs/etc/UserList accepts only krb4 syntax. Use `joe.admin` instead of `joe/admin`. See `https://lists.openafs.org/pipermail/openafs-devel/2002-December/008673.html` and the rest of the thread.
1091 ### <a name="3.46 Recovering broken afs cache"></a> 3.46 Recovering broken afs cache on clients
1093 >> Does anyone have a trick to force AFS to refresh its cache (for a
1094 >> particular directory or even for all files?) The only way I know
1095 >> how to accomplish this is to reboot, stop in single user mode,
1096 >> rm -rf the cache files and let AFS rebuild everything.
1098 > fs flush and fs flushv have cured corruption problems in the past
1099 > on some of our clients.
1101 Thanks for the tip - I was not aware of the flush* subcommands.
1102 Here's a little of what I saw today:
1105 /bin/ls: asso.S14Q00246.all.log: Bad address
1106 /bin/ls: asso.S14Q00246.all.lst: Bad address
1107 /bin/ls: chr14markers.txt: Bad address
1108 /bin/ls: geno.summary.txt: Bad address
1109 /bin/ls: global.ind.S14Q00246.all.txt: No such device
1110 /bin/ls: global.S14Q00246.all.txt: No such device
1112 [ other ls results as usual ]
1114 Flushing a particular file had no effect (the same error as shown above appears). Flushvolume took a long time, but when it eventually completed, the ls -la behaved exactly as one would expect.