How would you update the config and restart the service on multiple servers?

To update the configuration and restart the service on multiple servers, I would use automation and centralized configuration management:

1. Store configuration in a centralized repository (e.g., Git).
2. Use a configuration management system (Ansible, SaltStack, Puppet, Chef) to distribute updates to all servers.
3. Automate the service restart after updating the configuration using the same tools.

An approximate process:

• Prepare the updated configuration and commit it to the repository.
• Run a playbook/script that:
  • Copies the new configuration to all servers.
  • Checks the correctness of the configuration (if possible).
  • Restarts the service (e.g., systemctl restart myservice).

If the infrastructure is containerized, you can update the image with the new configuration and perform a rolling update.

It is important to consider:

• Backup of current configurations.
• Monitoring the service status after restart.
• Ability to rollback in case of issues.