Hi Lutz,
Our cluster had the same problem one or twice in the past.
The password on nodes can be synchronized with that of the server with
the following command
/opt/sync_files/bin/sync_files
This command is executed every 15 min via cron (cat /etc/crontab)
*/15 * * * * root env USER=root /opt/sync_files/bin/sync_files
>/dev/null 2>&1
If something goes wrong during the sync process, the passwd file will be
corrupted. In this case, we had to login the node with single user mode
(so that the root password is not needed), and then copy the password
files from the server.
Regards,
ST
On 2012/5/28 ?? 09:01, dr...@directbox.com wrote:
Hi all,
I have now repeatedly encountered a problem and would like to know if
it is a known / widespread one:
time and again some (or all) of the nodes of one of our clusters
become completely inaccessible (i.e. one cannot ssh or console-login
to nodes). By rebooting a node from a live medium one finds that
/etc/passwd has size 0; since I also find that /etc/groups and
/etc/shadow have the same date, I assume that OSCAR has got some
mechanism to distribute these files according to some schedule and
that corruption can occur during the process of pushing those files
down from the head node - am I right?
Now my question is, how could one analyze, why the cluster does this
and how could one fix it?
Regards
Dr Lutz Ackermann
MMC - UL
PS: It's an OSCAR 5 cluster installed on a RedHat derivative:
$ cat /proc/version
Linux version 2.6.9-78.ELsmp
(brewbuil...@ls20-bc2-14.build.redhat.com) (gcc version 3.4.6 20060404
(Red Hat 3.4.6-10)) #1 SMP Wed Jul 9 15:46:26 EDT 2008
$ cat /etc/*release
Red Hat Enterprise Linux AS release 4 (Nahant Update 7)
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Oscar-users mailing list
Oscar-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/oscar-users
--
Shiang-Tai Lin, Professor
Department of Chemical Engineering
National Taiwan University
TEL: +886-2-33661369
FAX: +886-2-23623040
Email: st...@ntu.edu.tw
Webpate: http://web.che.ntu.edu.tw/stlin/
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Oscar-users mailing list
Oscar-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/oscar-users
