Ansible-inventory

Inventory of managed nodes

https://www.digitalocean.com/community/tutorials/how-to-manage-multistage-environments-with-ansible Inventory is defined in /etc/ansible/hosts file. It allows you to define your managed hosts by hostname or IP address, and group them, such as "my_webservers_group" in our example in INI format.

Groups of groups, hierarchies, is also supported using (:children) keyword: [YOUR_NEW_GROUP_OF_GROUPS:children]

<source lang="yaml">

1. This is a example of a host configuration file. You can use # to include your comments on hosts file

foo_server.example.com 192.168.6.1 bar_server.example.com

[my_webservers_group] foo5.example.com bar6.example.com

[my_dbservers_group] onedb1.example.com twodb.example.com

1. Example of a server alias on standard Ansible port

my_local_defined_hostname ansible_host=192.0.2.50

1. Example of a server alias on a non standard Ansible port

my_jumper_server_alias ansible_host=192.0.2.50 ansible_port=5555

</source>

You can also read Ansible best practices

Basic operations with your inventory:

• List managed hosts:

ansible all --list-hosts

ansible YOUR_GROUP --list-hosts

ansible-inventory --graph

ansible-inventory --list

To filter just one group of host: ansible-inventory --list | jq '.["YOUR_GROUP_NAME"]'

• List defined groups

ansible localhost -m debug -a 'var=groups.keys()'

ansible localhost -m debug -a 'var=groups'

https://www.digitalocean.com/community/tutorials/how-to-manage-multistage-environments-with-ansible

http://docs.ansible.com/ansible/latest/user_guide/playbooks_best_practices.html