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WHM Munin not running

Your issue seems to have been that the munin-node service was not running:

[12:59:35 mail root@9469293 ~]cPs# systemctl status munin-node.service
● munin-node.service - Munin
Loaded: loaded (/etc/systemd/system/munin-node.service; enabled; vendor preset: disabled)
Active: failed (Result: timeout) since Sat 2018-04-21 21:58:40 CEST; 5 days ago

Apr 21 21:57:07 mail.ebs.dz systemd[1]: Starting Munin...
Apr 21 21:57:09 mail.ebs.dz systemd[1]: PID file /var/run/munin/munin-node.pid not readable (yet?) after start.
Apr 21 21:58:40 mail.ebs.dz systemd[1]: munin-node.service start operation timed out. Terminating.
Apr 21 21:58:40 mail.ebs.dz systemd[1]: Failed to start Munin.
Apr 21 21:58:40 mail.ebs.dz systemd[1]: Unit munin-node.service entered failed state.
Apr 21 21:58:40 mail.ebs.dz systemd[1]: munin-node.service failed.

I restarted that service for you:

[12:59:51 mail root@9469293 ~]cPs# systemctl start munin-node.service
[13:00:04 mail root@9469293 ~]cPs# systemctl status munin-node.service
● munin-node.service - Munin
Loaded: loaded (/etc/systemd/system/munin-node.service; enabled; vendor preset: disabled)
Active: active (running) since Fri 2018-04-27 13:00:04 CEST; 4s ago
Process: 738 ExecStart=/usr/local/cpanel/3rdparty/perl/524/sbin/munin-node (code=exited, status=0/SUCCESS)
Process: 725 ExecStartPre=/usr/bin/chown -R munin:munin /var/run/munin (code=exited, status=0/SUCCESS)
Process: 723 ExecStartPre=/usr/bin/mkdir -p /var/run/munin (code=exited, status=0/SUCCESS)
Main PID: 741 (munin-node)
CGroup: /system.slice/munin-node.service
└─741 /usr/local/cpanel/3rdparty/perl/524/bin/perl -wT /usr/local/cpanel/3rdparty/perl/524/sbin/munin-node

Apr 27 13:00:04 mail.ebs.dz systemd[1]: Starting Munin...
Apr 27 13:00:04 mail.ebs.dz systemd[1]: Started Munin.


-------------------------------------------------------------------------------------2 eme Solution



# systemctl status munin-node.service
● munin-node.service - Munin
   Loaded: loaded (/etc/systemd/system/munin-node.service; enabled; vendor preset: disabled)
   Active: failed (Result: timeout) since Wed 2018-08-08 21:19:48 CEST; 3 weeks 4 days ago

Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.
--

The service started up fine:

--

cPs# systemctl start munin-node.service

cPs# systemctl status munin-node.service ● munin-node.service - Munin
   Loaded: loaded (/etc/systemd/system/munin-node.service; enabled; vendor preset: disabled)
   Active: active (running) since Sun 2018-09-02 22:17:14 CEST; 2s ago
  Process: 21535 ExecStart=/usr/local/cpanel/3rdparty/perl/526/sbin/munin-node (code=exited, status=0/SUCCESS)
  Process: 21533 ExecStartPre=/usr/bin/chown -R munin:munin /var/run/munin (code=exited, status=0/SUCCESS)
  Process: 21530 ExecStartPre=/usr/bin/mkdir -p /var/run/munin (code=exited, status=0/SUCCESS)  Main PID: 21538 (munin-node)
   CGroup: /system.slice/munin-node.service
           └─21538 /usr/local/cpanel/3rdparty/perl/526/bin/perl -wT /usr/local/cpanel/3rdparty/perl/526/sbin/munin-node

Sep 02 22:17:14 mail.ebs.dz systemd[1]: Starting Munin...
Sep 02 22:17:14 mail.ebs.dz systemd[1]: PID file /var/run/munin/munin-node.pid not readable (yet?) after start.
Sep 02 22:17:14 mail.ebs.dz systemd[1]: Started Munin.
--

After starting the service, I noticed errors in /var/log/munin/munin-node.log

--
2018/09/02-22:30:07 [26794]      Error in tempfile() using template /var/lib/munin/plugin-state/nobody/XXXXXXXXXX: Could not create temp file /var/lib/munin/plugin-state/nobody/_SbyDsDmkk: Permission denied at /usr/local/cpanel/3rdparty/perl/526/lib64/perl5/cpanel_lib/Munin/Plugin.pm line 280.
2018/09/02-22:30:07 [26794] Service 'exim_mailstats' exited with status 13/0.
--

I ran an automated check on the munin service, during which a couple of issues were output:

--
# su - munin --shell=/bin/bash /usr/local/cpanel/3rdparty/perl/526/bin/munin-check
Last login: Sun Sep  2 22:34:12 CEST 2018 on pts/0

[truncated]

# /var/lib/munin/limits : Wrong permissions (664 != 644) # /var/lib/munin/plugin-state : Wrong owner (munin != nobody)
 

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