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In addition to host_vars and group_vars, Ansible supports the definition of variables using other techniques, including the following:
- Using the vars keyword within the play to specify multiple variables
- Using vars_files to define variables in a file and having Ansible read these variables from this file while running the playbook
- Specifying variables at the command line using the --e option
In addition to the user-defined variables that we can specify, Ansible has some default variables that it builds dynamically for its inventory. The following table captures some of the most frequently used variables:
| inventory_hostname | The name of the hosts as defined in the inventory (for example, csr1 and mx1) |
| play_hosts | A list of all the hosts included in the play |
| group_names | A list of all the groups that a specific host is a part of (for example, for csr1 this will be [edge, Cisco, network]) |