Merging two dictionaries by key in Ansible

Дима Белостоцкий

3/21/23, 10:59 AM

I'm looking for help in merging two dictionaries in a specific way. I would be very grateful for any thoughts.

I have two dictionaries like this: 1st dict:

servers:
  server1:
    Property1: A
    Property2: B
    Property3: C
  server2:
    Property1: A
    Property2: B
    Property3: C

2nd dict:

management:
  server1: ip1_addr
  server2: ip2_addr

Desired result:

servers:
  server1:
    Property1: A
    Property2: B
    Property3: C
    Property4: ip1_addr
  server2:
    Property1: A
    Property2: B
    Property3: C
    Property4: ip2_addr

Or I may have chosen the wrong path, all I need is to loop over two that dictionaries in one go, to get ip1_addr under server1 key and ip2_addr under server2 key

1480

0 + 0

ansible

Score:2

Server

Vladimir Botka

3/21/23, 1:34 PM

Convert the dictionary management first

    - set_fact:
        mgmt: "{{ mgmt|d({})|combine({item.key: {'Property4': item.value}}) }}"
      loop: "{{ management|dict2items }}"

gives

  mgmt:
    server1:
      Property4: ip1_addr
    server2:
      Property4: ip2_addr

Then combine the dictionaries

    - set_fact:
        servers: "{{ servers|combine(mgmt, recursive=True) }}"

gives the desired result

  servers:
    server1:
      Property1: A
      Property2: B
      Property3: C
      Property4: ip1_addr
    server2:
      Property1: A
      Property2: B
      Property3: C
      Property4: ip2_addr

If you want to iterate the result it's easier to convert both dictionaries to lists

    - set_fact:
        mgmt: "{{ mgmt|d([]) + [{'server': item.key,
                                 'Property4': item.value}] }}"
      loop: "{{ management|dict2items }}"

    - set_fact:
        srvs: "{{ srvs|d([]) + [{'server': item.key}|combine(item.value)] }}"
      loop: "{{ servers|dict2items }}"

give

  mgmt:
  - Property4: ip1_addr
    server: server1
  - Property4: ip2_addr
    server: server2

  srvs:
  - Property1: A
    Property2: B
    Property3: C
    server: server1
  - Property1: A
    Property2: B
    Property3: C
    server: server2

Then use Community.General filter lists_mergeby

    - debug:
        msg: "{{ srvs|lists_mergeby(mgmt, 'server') }}"

gives

  msg:
  - Property1: A
    Property2: B
    Property3: C
    Property4: ip1_addr
    server: server1
  - Property1: A
    Property2: B
    Property3: C
    Property4: ip2_addr
    server: server2

0 + 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Merging two dictionaries by key in Ansible

TH: การรวมพจนานุกรมสองเล่มด้วยคีย์ใน Ansible

RO: Îmbinarea a două dicționare prin cheie în Ansible

RU: Слияние двух словарей по ключу в Ansible

VI: Hợp nhất hai từ điển theo khóa trong Ansible

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.