In this Ansible IOS_Command Example post I will share a simple Ansible Playbook example that will write an ACL to a Cisco Switch.
This playbook will work equally well on any Cisco device and once you grasp the concepts of using the IOS_Command Module and also the IOS_Config module you can configure whatever you want.
You will soon see that Ansible Network Automation skills are very good to know to make your life as a network engineer a lot easier in the new world of network automation.
The IOS Command module is documented here – http://docs.ansible.com/ansible/latest/ios_command_module.html
There are the two parameters that I will highlight and I am using in my example playbook
- authorize – yes / no – This parameter enters privileged mode on the Cisco device if code says yes
- waitfor – List of conditions to wait for before progressing with the Playbook
Ansible IOS_Config Module
The IOS Config module is documented here – http://docs.ansible.com/ansible/latest/ios_config_module.html
So let’s get into the playbook
-- - hosts: 3560-SW1 gather_facts: false connection: local tasks: - name: Configure ACL on Cisco Switch ios_config: authorize: yes lines: - access-list 99 permit 172.16.1.100 - name: Verify ACL is present ios_command: commands: - sh access-l waitfor: - result contains 'permit 172.16.1.100' - name: SAVE CONFIG ios_config: authorize: yes save: yes
This is a very simple play that is very self explanatory just by reading the Jinja2 code
It will configure a line in an access list using the IOS_Config module it then verifies if that line is there using the ios_command module and finally saves the config using the IOS_Config module again.
Note: This playbook was written in Ansible 2.3 – the latest version 2.4 has another parameter in the IOS_Config module called save_when
This can be set to always / never / modified.
So the config can be saved only when it was modified.
The playbook is available on my GitHub – https://github.com/rogerperkin/playbooks
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