Ship KumoMTA logs with Filebeat

DISCLAIMER: not the recommended way, AMPQ is much more scalable.

Step 1: Install Filebeat on Rocky Linux

curl -L -O https://artifacts.elastic.co/downloads/beats/filebeat/filebeat-8.11.3-x86_64.rpm
sudo rpm -vi filebeat-8.11.3-x86_64.rpm

Step 2: Configure Filebeat

1. Create a Log File from Command Output:
   • Filebeat cannot directly read from a command output. You need to redirect the output of your command to a log file.
   • Use a command like nohup tailer --tail > /var/log/kumomta.log & to keep it running in the background and writing to a log file.
2. Edit Filebeat Configuration:

Edit the Filebeat configuration file located at /etc/filebeat/filebeat.yml:

sudo nano /etc/filebeat/filebeat.yml

Configure it to tail the log file you’re writing to. For example:

filebeat.inputs:
- type: log
  enabled: true
  paths:
    - /var/log/kumomta.log