ansible-dict-merge

ansible.cfg

[defaults]
jinja2_extensions=jinja2.ext.do

local_only_inventory

[all]
localhost ansible_connection=local

output

PLAY [test play for dict merge] ***********************************************

GATHERING FACTS ***************************************************************
<127.0.0.1> REMOTE_MODULE setup
ok: [127.0.0.1]

TASK: [output default values] *************************************************
ok: [127.0.0.1] => (item={'key': 'section2', 'value': {'s2key1': 'default_value3'}}) => {
    "item": {
        "key": "section2",
        "value": {
            "s2key1": "default_value3"
        }
    },
    "msg": "section2 = {'s2key1': 'default_value3'}"
}
ok: [127.0.0.1] => (item={'key': 'section1', 'value': {'s1key1': 'default_value1', 's1key2': 'default_value2'}}) => {
    "item": {
        "key": "section1",
        "value": {
            "s1key1": "default_value1",
            "s1key2": "default_value2"
        }
    },
    "msg": "section1 = {'s1key1': 'default_value1', 's1key2': 'default_value2'}"
}

TASK: [output tunable values] *************************************************
ok: [127.0.0.1] => (item={'key': 'section3', 'value': {'s3key1': 'tunable_value3'}}) => {
    "item": {
        "key": "section3",
        "value": {
            "s3key1": "tunable_value3"
        }
    },
    "msg": "section3 = {'s3key1': 'tunable_value3'}"
}
ok: [127.0.0.1] => (item={'key': 'section1', 'value': {'s1key3': 'tunable_value2', 's1key2': 'tunable_value1'}}) => {
    "item": {
        "key": "section1",
        "value": {
            "s1key2": "tunable_value1",
            "s1key3": "tunable_value2"
        }
    },
    "msg": "section1 = {'s1key3': 'tunable_value2', 's1key2': 'tunable_value1'}"
}

TASK: [merge default and tunable values] **************************************
ok: [127.0.0.1] => {"ansible_facts": {"merged_dict": {"section1": {"s1key1": "default_value1", "s1key2": "tunable_value1", "s1key3": "tunable_value2"}, "section2": {"s2key1": "default_value3"}, "section3": {"s3key1": "tunable_value3"}}}}

TASK: [output merged values] **************************************************
ok: [127.0.0.1] => (item={'key': 'section3', 'value': {'s3key1': 'tunable_value3'}}) => {
    "item": {
        "key": "section3",
        "value": {
            "s3key1": "tunable_value3"
        }
    },
    "msg": "section3 = {'s3key1': 'tunable_value3'}"
}
ok: [127.0.0.1] => (item={'key': 'section2', 'value': {'s2key1': 'default_value3'}}) => {
    "item": {
        "key": "section2",
        "value": {
            "s2key1": "default_value3"
        }
    },
    "msg": "section2 = {'s2key1': 'default_value3'}"
}
ok: [127.0.0.1] => (item={'key': 'section1', 'value': {'s1key1': 'default_value1', 's1key3': 'tunable_value2', 's1key2': 'tunable_value1'}}) => {
    "item": {
        "key": "section1",
        "value": {
            "s1key1": "default_value1",
            "s1key2": "tunable_value1",
            "s1key3": "tunable_value2"
        }
    },
    "msg": "section1 = {'s1key1': 'default_value1', 's1key3': 'tunable_value2', 's1key2': 'tunable_value1'}"
}

PLAY RECAP ********************************************************************
127.0.0.1                  : ok=5    changed=0    unreachable=0    failed=0

test-playbook.yml

- name: test play for dict merge
  hosts: 127.0.0.1
  connection: local
  vars:
    default_dict:
      section1:
        s1key1: "default_value1"
        s1key2: "default_value2"
      section2:
        s2key1: "default_value3"
    tunable_dict:
      section1:
        s1key2: "tunable_value1"
        s1key3: "tunable_value2"
      section3:
        s3key1: "tunable_value3"
  tasks:
  - name: output default values
    debug: msg="{{ item.key }} = {{ item.value }}"
    with_dict: default_dict
  - name: output tunable values
    debug: msg="{{ item.key }} = {{ item.value }}"
    with_dict: tunable_dict
  - name: merge default and tunable values
    set_fact:
      merged_dict: "{% for key, value in tunable_dict.iteritems() %}{% if default_dict[key] is defined %}{% do default_dict[key].update(tunable_dict[key]) %}{% else %}{% do default_dict.update({key:value}) %}{% endif %}{% endfor %}{{ default_dict }}"
  - name: output merged values
    debug: msg="{{ item.key }} = {{ item.value }}"
    with_dict: merged_dict