Monitoring bind/named with Munin on cPanel DNS Only

Last night I attempted to get named monitoring working with Munin on my two cPanel DNS Only boxes. Named is actually the most important service to monitor on a DNS Only box so in my opinion it should be enabled by default when you install Munin via WHM.
The whole process was actually really straightforward and the only thing I had to do was to apply a set of Debian instructions I found here, on CentOS. Here’s how you can install Munin and setup named monitoring

Install Munin via WHM

cPanel -> Manage Plugins -> Check “Install and keep updated” -> Save

Configure named

Login to you server via SSH, open /etc/named.conf and add the following:

logging {
/*	If you want to enable debugging, eg. using the 'rndc trace' command,
 *	named will try to write the 'named.run' file in the $directory (/var/named").
 *	By default, SELinux policy does not allow named to modify the /var/named" directory,
 *	so put the default debug log file in data/ :
 */
    channel default_debug {
            file "data/named.run";
            severity dynamic;
    };
    channel b_query {
            file "/var/log/bind9/query.log" versions 2 size 1m;
            print-time yes;
            severity info;
    };
    category queries { b_query; };
};

Save the changes, and restart named

[root@dns1 ~]#/etc/init.d/named restart
Stopping named:                                            [  OK  ]
Starting named:                                            [  OK  ]

Configure the bind9 plugins

First you’ll have to create the symlinks to the two bind9 plugins:

ln -s /usr/share/munin/plugins/bind9 /etc/munin/plugins/bind9
ln -s /usr/share/munin/plugins/bind9_rndc /etc/munin/plugins/bind9_rndc

Now open the file /etc/munin/plugin-conf.d/cpanel.conf and add the following code to the end of the file.

[bind9]
user root
env.logfile   /var/log/bind9/query.log

[bind9_rndc]
user root
env.querystats /var/named/data/named_stats.txt

Wrapping things up

Finally restart munin-node, run rndc stats and try munin-run bind9 & munin-run bind9_rndc to see if you get proper output like this:

[root@dns1 ~]#/etc/init.d/munin-node restart
Stopping Munin Node agents:                                [  OK  ]
Starting Munin Node:                                       [  OK  ]
[root@dns1 ~]#rndc stats
[root@dns1 ~]#munin-run bind9
query_A.value 55
query_AAAA.value 30
query_ANY.value 1
query_other.value 0
[root@dns1 ~]#munin-run bind9_rndc
query_recursion.value 0
query_success.value 49
query_failure.value 0
query_nxrrset.value 23
query_referral.value 0
query_nxdomain.value 0

What you’ll get

After leaving it run for at least 30 minutes you’ll see something like this

(Optional) Errors you might encounter

If you receive the following error

[root@dns1 ~]# munin-run bind9
Died at /etc/munin/plugins/bind9 line 74.

you need to create the bind9.state file like this:

touch /var/lib/munin/plugin-state/bind9.state
chown munin:munin /var/lib/munin/plugin-state/bind9.state
chmod g+rw /var/lib/munin/plugin-state/bind9.state

and try running munin-run bind9 again.

4 thoughts on “Monitoring bind/named with Munin on cPanel DNS Only

  1. diego

    I am getting the following while trying to run the first command:

    #munin-run bind9
    No such file or directory at /etc/munin/plugins/bind9 line 60.

    I double checked the file is there and that it is symlinked, any ideas?

    Reply
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