Monitoring Postfix

Configure the Server Density agent to monitor your Postfix server to:

• Collect important metrics such as mail queue size
• Identify overall server slowdowns caused by the server

Monitored metrics

  • Queue Size

The Postfix plugin requires sudo to execute, see here for more details. 

Installing the PostFix plugin package

Install the PostFix plugin on Debian/Ubuntu:

sudo apt-get install sd-agent-postfix

Install the PostFix plugin on RHEL/CentOS:

sudo yum install sd-agent-postfix

Read more about agent plugins.

Configuring the agent to monitor Postfix

1. Configure /etc/sd-agent/conf.d/postfix.yaml


- directory: /var/spool/postfix
- incoming
- active
- deferred
  • Important: the sd-agent user must have sudo access to run this plugin. See sudo access for more info

2. Restart the agent

sudo /etc/init.d/sd-agent restart

Verifying the configuration
Execute info to verify the configuration with the following:

sudo /etc/init.d/sd-agent info 

If the agent has been configured correctly you’ll see an output such as:

  - instance #0 [OK]
  - Collected 1 metrics & 0 events

You can also view the metrics returned with the following command:

sudo -u sd-agent /usr/share/python/sd-agent/ check postfix

Configuring graphs

Click the name of your server from the Devices list in your Server Density account then go to the Metrics tab. Click the + Graph button on the right then choose the Postfix metrics to display the graphs. The metrics will also be available to select when building dashboard graphs.

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