Run Ansible Against All Hosts in The Inventory

In this blog post, I will show you how to run Ansible commands or playbooks against all the hosts in the inventory.

By default, Ansible comes with a pre-defined group called all (or *) that includes all the inventory hosts. Using the all group is very helpful if you want to run a command against all the hosts in the inventory file.

Example

In the following example, I will execute the df command against all the hosts in my inventory without specifying specific hosts or host groups.

ansible all -a df -i hosts

To run Ansible against a single host I can simply use the following command.

ansible hostname -a df -i hosts 

To run ansible again multiple hosts I will run the following command.

ansible hostname1,hostname2 -a df -i hosts