check if host is part of group

[Khuong Dinh Pham]

Hi

I have this setup in my hosts

server1 ansible_ssh_host=server1.xxx.com

server2 ansible_ssh_host=server2.yyy.com

server3 ansible_ssh_host=server3.yyy.com

[frontendservers]

server1

server2

server3

[frontendcluster1]

server1

server2

My playbook:

---

  hosts: frontendservers

  tasks:

    - name: testing

      command: copy some file

      when: $host part of 'frontendcluster1' group

I only want the command to be executed for server1 and server2? How can I achieve that?

Thx for advance.

[Michel Blanc]

Hi Khuong,

Just create a group for these hosts, and change your hosts: line in the
playbook :

[onlythose]
server1
server2



- hosts: onlythose

tasks:
- name: testing
command: copy some file

Cheers,

M
--
Michel Blanc
{ :github => "@leucos", :twitter => "@b9m", :gpg => "0X24B35C22" }

[Michael DeHaan]

Super easy!

- hosts:  frontendcluster1 

  tasks:

    ...

You can have multiple plays in a playbook file.

For more complex things you can also say stuff like:

- hosts: group1:&group2

Which means "must be in both"

See http://ansibleworks.com/docs/intro_patterns.html

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[Brian Coca]

almost always better to do as mentioned above but if you REAAAAAAALLLLYYYY need it:

    when: inventory_hostname in groups['frontendcluster1']

[Khuong Dinh Pham]

Hi

Thx. Just what I need.

It's because I have one playbook for my frontendservers hosts. This playbook include roles but only some of the tasks should be deploy on a subset of the frontendservers. i.e. part of frontendcluster01 group

[Michael DeHaan]

    when: inventory_hostname in groups['frontendcluster1']

Also more easily written as:

when: inventory_hostname in groups.frontendcluster1

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[Kahlil Hodgson]

Awesome tip! Much better than the quotation hell that I've been using :-)

when "'frontendcluster1' in group_names"


K

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