Bash Script to Keep the Orchestrator Alive

Development How To
1

Background

If the orchestrator loses connection to the znnd node or eth node it will shut down regardless of how the service is setup.

Here’s a bash script that checks if the orchestrator service is running, and if not, starts it and logs an event to /var/log/syslog. You can then set this script to run as a cron job every minute.

Step 1: Create the Bash Script

  1. Create the script, for example, nano /usr/local/bin/check_orchestrator.sh.
#!/bin/bash

# Check if the service is running
if ! systemctl is-active --quiet orchestrator; then
  # If not running, start the service
  systemctl start orchestrator
  
  # Log to syslog
  logger "Orchestrator service was not running and has been started."
fi
  1. Make the script executable:
sudo chmod +x /usr/local/bin/check_orchestrator.sh

Step 2: Set Up the Cron Job

  1. Open the cron job editor:
crontab -e
  1. Add the following line to run the script every minute:
* * * * * /usr/local/bin/check_orchestrator.sh

Explanation:

  • systemctl is-active --quiet orchestrator: This checks if the orchestrator service is running. The --quiet flag ensures that no output is produced.
  • systemctl start orchestrator: This command starts the orchestrator service if it is not running.
  • logger "Orchestrator service was not running and has been started.": This logs a message to /var/log/syslog.

This setup will ensure that the orchestrator service is checked every minute, and if it is found to be stopped, it will be started, and an entry will be made in the syslog.

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