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CPPOP WENT DOWN... Automatic check on this???

Discussion in 'General Discussion' started by nitromax, Sep 25, 2002.

  1. nitromax

    nitromax Well-Known Member

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    Does anyone know if there is a cron that checks to see if the pop3 server is running or not?

    If not does anyone know how I could implement that?


    Last night something happened and when I came into work I found out that the pop3 server was down, and no one could access their control panels. I restarted the pop3 server from the WHM, and I did this ( /etc/rc.d/init.d/cpanel3 restart ) via SSH command line and the control panels came back too.
     
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    #1 nitromax, Sep 25, 2002
  2. ecoutez

    ecoutez Well-Known Member

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    Sure. Chkserv.d can do this...

    Create a new file in /etc/chkserv.d/ - any name you like, but something like pop3 or cppop would make sense. Contents should look like:
    #SERVICE = PORT, SEND, RESPONSE, RESTART COMMAND
    service[pop3]=110,QUIT,+,/usr/local/cpanel/bin/cppop

    chown/chmod just as the other files in this directory (root.root, 600) and restart chkserv.d (/etc/rc.d/init.d/chkservd restart)

    - Jason
     
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    #2 ecoutez, Sep 25, 2002
  3. ecoutez

    ecoutez Well-Known Member

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    As long as we're at it, here's what I use to check IMAPd:
    #SERVICE = PORT, SEND, RESPONSE, RESTART COMMAND
    service[imapd]=143,. LOGOUT,* OK,/etc/rc.d/init.d/xinetd start

    And for SSHd:
    #SERVICE = PORT, SEND, RESPONSE, RESTART COMMAND
    service[sshd]=22,QUIT,SSH-,/etc/rc.d/init.d/sshd start

    - Jason
     
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    #3 ecoutez, Sep 25, 2002
  4. nitromax

    nitromax Well-Known Member

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    Thanks for the quick reply! It looks like chkservd was not even running. I will try your suggestions above.

    Sorry for a newbie question, but if I understand correctly chkservd runs in the backgroud at all times? How often does it check to make sure apache and the other services are up? Like if I manually kill apache how quickly will it take chkservd to get it back up? Does it check the services like every 1 minute or something?

    And what checks to make sure chkservd is running? hehe How would you do that?
     
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    #4 nitromax, Sep 25, 2002
  5. ecoutez

    ecoutez Well-Known Member

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    [quote:0d36f284b3][i:0d36f284b3]Originally posted by nitromax[/i:0d36f284b3]
    Sorry for a newbie question, but if I understand correctly chkservd runs in the backgroud at all times? How often does it check to make sure apache and the other services are up?
    [/quote:0d36f284b3]
    Yes... it should be running at all times, and seems to check services every 8 or 9 minutes. Take a look at your /var/log/chkservd.log to see when it made its checks.
    [quote:0d36f284b3]
    Like if I manually kill apache how quickly will it take chkservd to get it back up? Does it check the services like every 1 minute or something?
    [/quote:0d36f284b3]
    Figure 9 minutes or less - depends on where in the cycle it happens to be when you kill Apache. Because of that 8-9 minute interval, a service could be down for that long before being reported as down, and before a restart is attempted. And when chkservd does see a service down, it immediately reports it down and THEN attempts to restart it. As such, you will start getting a report about a down service at the same time that the situation is corrected. And then another 8-9 minutes later you'll see it reporting as up again.
    [quote:0d36f284b3]
    And what checks to make sure chkservd is running? hehe How would you do that?[/quote:0d36f284b3]
    I guess you could run a cron job every hour to make sure its running, or use some other service checking program.

    - Jason
     
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    #5 ecoutez, Sep 25, 2002
  6. jsteel

    jsteel Well-Known Member

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    It there a way to increase the frequency of the checks? 8-9 minutes is a pretty long time.

    Jaz
     
    #6 jsteel, Oct 11, 2002
  7. dgbaker

    dgbaker Well-Known Member
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    For changing interval of checking.

    I found in /usr/sbin/chkservd there is a sleep 500 (8.33 minutes) on line 63. I've modifed mine to 180 (2 minutes) seems to be working fine. :)

    Nick or someone would have to make a permanant change or make this configurable.

    NOTE: Found issue with this. httpd connections get chewed up real fast and you will start to see http restarts on SIGUSR1.

    I wonder if that is why it was set to 8 minutes :p
     
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    #7 dgbaker, Oct 29, 2002
  8. nitromax

    nitromax Well-Known Member

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    Thanks David, that works great! Although for me it said sleep(100) on line 63, so I searched for the sleep statement and found sleep(500) farther down in the script, just a few lines above the subroutine called notify.... shown below. But that seems to do the trick! I changed it to 120.

    print &Done\n&;
    sleep(120);
    }
    close(LOG);


    sub notify {
    my($subject,$body) = @_;


    I think everyone gets those SIGUSR1 restarts every 10 minutes. I still don't understand that issue.


    Thanks again!
     
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    #8 nitromax, Oct 29, 2002
  9. dgbaker

    dgbaker Well-Known Member
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    What's neat is that this version of apache 1.3.27 is supposed to have fixed that issue with SIGUSR1.
     
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    #9 dgbaker, Oct 29, 2002
  10. nitromax

    nitromax Well-Known Member

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    Really? I just recompiled Apache lastnight using the /scripts/easyapache. I know that is 1.3.27. But I just did the following command and I'm still getting them every 10 minutes:


    grep &SIG& /usr/local/apache/logs/error_log | grep &Oct 29&

    Are yours gone?
     
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    #10 nitromax, Oct 29, 2002
  11. dgbaker

    dgbaker Well-Known Member
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    Nope. Still there..
     
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    #11 dgbaker, Oct 29, 2002
  12. jamesbond

    jamesbond Well-Known Member

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    [quote:29a184fccc][i:29a184fccc]Originally posted by dgbaker[/i:29a184fccc]

    What's neat is that this version of apache 1.3.27 is supposed to have fixed that issue with SIGUSR1.[/quote:29a184fccc]

    Well I'm running Apache 1.3.27 and CPanel R56 and I have the SIGUSR1 message in the logs every 10 min as well.

    [Thu Nov 28 21:19:07 2002] [notice] SIGUSR1 received. Doing graceful restart
    [Thu Nov 28 21:29:07 2002] [notice] SIGUSR1 received. Doing graceful restart
    [Thu Nov 28 21:39:07 2002] [notice] SIGUSR1 received. Doing graceful restart
    [Thu Nov 28 21:49:07 2002] [notice] SIGUSR1 received. Doing graceful restart
    [Thu Nov 28 21:59:07 2002] [notice] SIGUSR1 received. Doing graceful restart
    [Thu Nov 28 22:09:12 2002] [notice] SIGUSR1 received. Doing graceful restart
     
    #12 jamesbond, Nov 28, 2002
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