using pm2 with ansible

user_3016716 0
Viewed 8781

I am trying to start a node program using pm2 via ansible. The problem is that the pm2 start command is not idempotent under ansible. It gives error when run again.

This is my ansible play

- name: start the application
  become_user: ubuntu
  command: pm2 start app.js -i max
  tags: 
    - app

Now if i run this the first time then it runs properly but when i run this again then i get the error telling me that the script is already running.

What would be the correct way to get around this error and handle pm2 properly via ansible.

pm2 npm ansible node.js
4 Answers

I would use

pm2 reload app.js -i max

It will allow you to reload configuration ;-)

user_101015050

I ended up on this page looking for a solution to start PM2 multiple times when I rerun my playbook. I also wanted PM2 to reload the server when it was already running and pickup the new code I might have deployed. It turns out that PM2 has such an interface:

- name: Start/reload server 
  command: '{{path_to_deployed_pm2}} startOrReload pm2.ecosystem.config.js'

The startOrReload command requires a so-called "ecosystem" file to be present. See the documentation for more details: Ecosystem File.

This is a minimal pm2.ecosystem.config.js that is working for me:

module.exports = {
  apps : [{
    script: 'app.js',
    name: "My app"
  }],
};
user_5980570

Here we can use the "register" module to perform a conditional restart/start.

register the output of following command:

shell: pm2 list | grep <app_name> | awk '{print $2}'
register: APP_STATUS
become: yes

and the use APP_STATUS.stdout to make a conditional start and restart tasks. This way we don't need a pm2 delete step.

user_149903000
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