Skip to main content

Constant email notifications from Munin

Brian Dial
  • Updated

Symptoms

Messages with the following characteristics are received every 5 minutes from Munin (munin@server.hostname.tld).

Subject:

Cron <munin@hostname> /usr/local/cpanel/3rdparty/perl/532/bin/munin-cron

Body:

Magic number checking on storable file failed at /usr/local/cpanel/3rdparty/perl/532/lib/perl5/532/x86_64-linux-64int/Storable.pm line 436, at /usr/local/cpanel/3rdparty/perl/532/lib/perl5/cpanel_lib/Munin/Master/Utils.pm line 279.

Magic number checking on storable file failed at /usr/local/cpanel/3rdparty/perl/532/lib/perl5/532/x86_64-linux-64int/Storable.pm line 436, at /usr/local/cpanel/3rdparty/perl/532/lib/perl5/cpanel_lib/Munin/Master/Utils.pm line 279.

 

Description 

These notifications indicate an issue with the Munin installation. Specifically, there are likely 0-byte files that Munin requires to function correctly.

 

Workaround

To correct this issue, check for 0-byte files, back them up, and reinstall Munin.

  1. Access the server's command line as the 'root' user via SSH or "Terminal" in WHM.
  2. Run the following command to locate and backup 0-byte files in the /var/lib/munin folder. 
    [root@server ~]cPs# find /var/lib/munin -size 0 -exec mv -v {}{,.$(date +%s)} \;
    renamed '/var/lib/munin/plugin-state/yum.state' -> '/var/lib/munin/plugin-state/yum.state.1691587504'
    renamed '/var/lib/munin/datafile.storable' -> '/var/lib/munin/datafile.storable.1691587504'
    renamed '/var/lib/munin/htmlconf.storable' -> '/var/lib/munin/htmlconf.storable.1691587504'
    renamed '/var/lib/munin/munin-update.stats.tmp' -> '/var/lib/munin/munin-update.stats.tmp.1691587504'
    [root@server ~]cPs#
  3. Use the RPM command to identify the Munin package. 
    [root@server ~]cPs# rpm -qa|grep munin
    cpanel-munin-2.0.30-2.cp108~el8.x86_64
    [root@server ~]cPs#
  4. Use the rpm command with the -e and --nodeps options to remove the Munin package. 
    [root@server ~]cPs# rpm -e --nodeps cpanel-munin-2.0.30-2.cp108~el8.x86_64
    - uninstalling munin
    Removed /etc/systemd/system/multi-user.target.wants/munin-node.service.
    munin_addon unregistered
    [root@server ~]cPs#
  5. Use the check_cpanel_pkgs to reinstall the Munin package. 
    /scripts/check_cpanel_pkgs

 

Additional resources

The check_cpanel_pkgs Script

Related articles