On 09/01/2011 09:40 AM, Götz Reinicke wrote:
> Am 01.09.11 15:08, schrieb Prentice Bisbal:
>> On 09/01/2011 08:36 AM, Götz Reinicke wrote:
>>> Hi,
>>>
>>> recently I updated our ldapd on our RH EL 6.1 to the most recent version
>>> openldap-2.4.23-15.el6_1.1.x86_64 (from 2.4.19-15)
>>>
>>> Since than the deamon died twice in the middle of the night, leaving no
>>> traces to me why.
>>>
>>> The 2.4.19-15-version never died ...
>>>
>>
>> I can't offer any advice as to why it died, but if you haven't done so,
>> I recommend creating a 'watchdog' script that checks to make sure
>> 'slapd' is running, and if it isn't, restart it. Run it from cron every
>> couple of minutes and have it e-mail you every time it needs to restart
>> slapd.
>>
>> This will protect your sanity and avoid phone calls in the middle of the
>> night, as well as automatically collect statistics on how often and when
>> it's dying, which may help your correlate it to another event occuring
>> at the same time which is the root cause. If your watchdog script runs
>> frequently enough, users might not even notice it's down.
>
> Thanks for your suggestion, may be you could give me a hint on how to
> set this up? In the example config, there is a check for an existing
> .pid-file.
>
> That would not work in my case, as the pid file is still there, but the
> slapd-process died.
>
Use pgrep to check the output of ps, like this, and then check the exit
value returned by pgrep. something like this. (Do not copy exactly - not
tested, sure to have syntax errors. Now warranties implied, etc)
#!/bin/bash
pgrep slapd
retval=$?
if [ $retval != 0 ]; then
# remove PID file
rm -rf /path/to/pid
# restart slapd
service ldap start
echo "LDAP server restarted at $(date)" | mail -s "LDAP restarted"
[email protected]
fi
The exit statuses of pgrep are documented in the man page:
EXIT STATUS
0 One or more processes matched the criteria.
1 No processes matched.
2 Syntax error in the command line.
3 Fatal error: out of memory etc.
--
PRentice
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