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zabbix

Setting Up Monitoring for a Postfix Service

On the Mail Server

  1. Edit the Zabbix agent configuration file: vim /etc/zabbix/zabbix_agent2.d/postfix.conf

  2. Add the following line: UserParameter=postfix.running,script /tmp/postfix-script-zabbix.log -qc 'sudo postfix status' | grep -c 'PID'

  3. Ensure your Zabbix agent is configured for active checks by checking these parameters in your /etc/zabbix/zabbix_agent2.conf:

ServerActive=your_zabbix_server_ip
HostnameItem=system.hostname

  1. Restart the Zabbix agent: systemctl restart zabbix-agent2

  2. Check the status of the Zabbix agent: systemctl status zabbix-agent2

The mail server's Zabbix agent will now collect the Postfix status using a script command and report that data back to the Zabbix server. The Zabbix server must then be configured to processes this information and handle alerting.

In the Zabbix web interface:

  1. Create a new item for your host Data collection -> Hosts -> Items (column next to the desired host) -> Create item (at top right)

  2. Set the following parameters:

  • Name: Monitor postfix service
  • Type: Zabbix agent (active)
  • Key: postfix.running
  • Type of information: Text
  • Description (optional): Monitor postfix service.

sample-config-item

  1. Click "Add" to save the item

  2. Create a trigger based on the return value Data collection -> Hosts -> Triggers (column next to the desired host) -> Create trigger (at top right)

  3. Set the following parameters (Replace instances of mail_server_hostname with your actual host name in Zabbix):

  • Name: Postfix service is not running on {HOST.NAME}
  • Severity: High
  • Problem expression: last(/mail_server_hostname/postfix.running)=0
  • OK event generation: Recovery expression
  • Recovery expression: last(/mail_server_hostname/postfix.running)>0
  • PROBLEM event generation mode: Single
  • OK event closes: All problems
  • Description (optional): Postfix has stopped running.

sample-config-trigger

  1. Click "Add" to save the trigger

This trigger will fire when the Postfix check returns 0 (not running) and will automatically resolve when the check returns a value greater than 0 (running).