Filter plugins

Archives Ansible Project
1

Recently I had to write templates containing somewhat long filter pipelines. Part of the logic involved lookuping current output of the pipeline in a dictionary (hostvars) and then extracting the value of a field of the resulting dictionary. In order to keep things decoupled I wrote two almost trivial plugins. Here an example:

`

  • name: find another host to join to form a cluster (e.g. Consul)
    set_fact:
    host_to_join: >
    {{
    groups[‘my_group’] | difference([inventory_hostname])

list
random
find_in(hostvars)
get_key(‘ec2_private_ip_address’)
}}

`

Just wondering whether there are other existing ways of achieving the same result, with/without plugins, as surely someone must have faced a similar task.

Thanks
Valentin

2

something like:

- name: find another host to join to form a cluster (e.g. Consul)
   set_fact:
     host_to_join: >
     {{
       (groups['my_group'] | difference([inventory_hostname])
                          > random
                          > intersection(hostvars.keys())
).'ec2_private_ip_address'
     }}