Controlling parallelism and rolling updates in Ansible

By default, Ansible runs tasks in parallel. In this recipe, we will outline how to control the parallel execution of Ansible and how we can modify this default behavior. We will also explore the concept of rolling updates and how to utilize them in Ansible.

How to do it...

1. Update the ansible.cfg file to control parallel execution, as shown in the following code snippet:

[defaults]
forks=2

2. Update the pb_push_acl.yml file to set up rolling updates for the configuration push on the network devices, as shown in the following code block:

- name: Configure ACL on IOS-XR
  hosts: all
  serial: 1
  tags: deploy
  tasks:
    - name: Backup Config
      iosxr_config:
        backup...