playbook --limit

[vadimv Vatlin]

This is my hosts:

[main_node]

1.2.3.4

[child_node]

1.2.3.4:2222

child_node is virtual container inside the main_node 

why 

ansible-playbook --diff --limit=child_node lc.yml  --list-hosts

playbook: lc.yml

  play #3 (main node): host count=1

    1.2.3.4

  play #4 (child node): host count=1

    1.2.3.4

lc.yml

- name: main node

  hosts: main_node

  roles:

    - common

    - zabbix-agent

- name: child node

  hosts: child_node

  roles:

    - common

[Matt Martz]

Ansible determines host uniqueness based on the hostname, in your case this is currently `1.2.3.4`.  What you need to do is use host aliases if you intend on having 2 hosts with the same IP but different ports.  Such as:

[main_node]

main ansible_ssh_host=1.2.3.4

[child_node]

child ansible_ssh_host=1.2.3.4 ansible_ssh_port=2222

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Matt Martz
@sivel
sivel.net