Running ansible command on a single server when it is deployed to multiple servers

Question

I want to run a database migration operation at the end of a deployment process for my application. So, the problem is I want to cal this operation only once for one particular server, but ansible runs all commands on all given servers. Is there any way to do this?

Answer 1

You can try the run_once attribute:

Example from the ansible docs:

---
# ...

  tasks:

    # ...

    - command: /opt/application/upgrade_db.py
      run_once: true

    # ...

Answer 2

Hi,

You may try to executive delegate_to module to the playbook hence the task will be executed in that particular server at once.

Example:

----
hosts: all
tasks:
  -name: Running ansible command on a single server
  command:
delegate_to: server name