Over the past few days we have been getting some messages from one server about imap being down:
"imap failed @ Wed Dec 8 21:14:04 2010. A restart was attempted automagically.
Service Check Method: [tcp connect]
Failure Reason: Timeout while trying to get data from service"
When I go to the maillog at the time mentioned I see that there are tons of "disconnected by shutdown during signal" messages.
I have a feeling that imap isnt really down but the checker is not able to get a login or something and it thinks IMAP is down and resets the whole thing.
Is there a way to interrogate IMAP or the server to see how many current connections there are or something?. I raised the max connections from 55 to 65 and auth demons from 7 to 9 to see if it helps but not sure if thats the problem.
Anybody know anything about this kind of problem and if there is a way to check other than just telnet to the imap or putting up a pinger?.
Also why are there often several imap tasks per person?. For instance I see one user with five, does this mean he has five connections?
root@xxxxx [/var/log]# ps ax| grep "evan"
7407 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
7989 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
7998 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
10784 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
16098 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
17627 pts/0 R+ 0:00 grep evan
root@xxxxx [/var/log]#
"imap failed @ Wed Dec 8 21:14:04 2010. A restart was attempted automagically.
Service Check Method: [tcp connect]
Failure Reason: Timeout while trying to get data from service"
When I go to the maillog at the time mentioned I see that there are tons of "disconnected by shutdown during signal" messages.
I have a feeling that imap isnt really down but the checker is not able to get a login or something and it thinks IMAP is down and resets the whole thing.
Is there a way to interrogate IMAP or the server to see how many current connections there are or something?. I raised the max connections from 55 to 65 and auth demons from 7 to 9 to see if it helps but not sure if thats the problem.
Anybody know anything about this kind of problem and if there is a way to check other than just telnet to the imap or putting up a pinger?.
Also why are there often several imap tasks per person?. For instance I see one user with five, does this mean he has five connections?
root@xxxxx [/var/log]# ps ax| grep "evan"
7407 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
7989 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
7998 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
10784 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
16098 ? S 0:00 /usr/lib/courier-imap/bin/imapd /home2/evanw/mail/xxxx.com/evan
17627 pts/0 R+ 0:00 grep evan
root@xxxxx [/var/log]#
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