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

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

5. 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.

3. Click "Add" to save the item

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

5. 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.

6. 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).