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Ansible from_yaml Filter

2021-01-28 125 words One minute

Contents

The Ansible from_yaml filter can be used to simplify data manipulation with formatted data.

An example of the list data type:

Without a filter

I have to use both strip and split functions, which is error-prone.

        
glusterfs_node_hostname_base: |
  {% for item in glusterfs_node|unique %}
  {{ hostvars[item].get('ansible_hostname') }}
  {% endfor %}

## gluster requires unique hostname or nodename while probing peers, here glusterfs_node_hostname 
## stores all glusterfs node's hostname for a validation purpose
glusterfs_node_hostname: "{{ glusterfs_node_hostname_base.strip().split('\n') | default([]) }}"

With `from_yaml` filter

        
        
        
    
glusterfs_node_hostname_base: |
  ---
  {% for item in glusterfs_node|unique %}
  - {{ hostvars[item].get('ansible_hostname') }}
  {% endfor %}

## gluster requires unique hostname or nodename while probing peers, here glusterfs_node_hostname 
## stores all glusterfs node's hostname for a validation purpose
glusterfs_node_hostname: "{{ glusterfs_node_hostname_base | from_yaml }}"