If /var/run/munin/ doesn't exists munin-node doesn't start either. This could be solved adding to the systemd service definition (/lib/systemd/system/munin-node.service) this line:
ExecStartPre=/bin/mkdir -p /var/run/munin /var/log/munin;/bin/chown munin:root /var/run/munin;/bin/chown munin:www-data /var/log/munin Creating those files before starting was the behavior of /etc/init.d/munin script before systemd arrived. Please find attached the patch file. Regards, Alejandro Suarez
--- munin-node.service 2016-07-27 17:28:03.808943349 +0000 +++ munin-node.service.new 2016-07-27 17:31:03.388939629 +0000 @@ -6,6 +6,7 @@ EnvironmentFile=-/etc/default/munin-node Type=forking Restart=always +ExecStartPre=/bin/mkdir -p /var/run/munin /var/log/munin;/bin/chown munin:root /var/run/munin;/bin/chown munin:www-data /var/log/munin ExecStart=/usr/sbin/munin-node $DAEMON_ARGS PIDFile=/run/munin/munin-node.pid
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