Arrays in Ansible

Question

I have a json like below

{
"nodes":[
  {
     "node_values":[
        "[test1]",
        "10.33.11.189",
        "10.33.11.185"
     ]
  },
  {
     "node_values":[
        "[test2]",
        "10.33.11.189",
        "10.33.11.185"
     ]
  }
]
}

I am trying to read only the node values and put it in the text files. I am using below ansible code

  hosts: localhost
  vars:
    tmpdata1: "{{ lookup('file','test.json')|from_json }}"

  tasks:
    - name: Add mappings to /etc/hosts
      blockinfile:
        path: /home/s57232/Ansible-Install/Install_Inventory.txt
        content:  item
        marker: "# {mark} ANSIBLE MANAGED BLOCK {{ item.node_values[0] }}"
      loop: "{{ tmpdata1 |json_query('nodes[*].node_values[*]') }}"

i am getting below error

**TASK [Add mappings to /etc/hosts] **********************************************************************************************************************************
fatal: [localhost]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'list object' has no attribute 'node_values'\n\nThe error appears to have been in '/home/s57232/Ansible-Install/prepare_inventory.yml': line 14, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: Add mappings to /etc/hosts\n      ^ here\n"}**

When i am trying to read with with items and file format with out the blockinfile, if the same IP is there in multiple places, it is not writing, because it is looking for unique values. I am not able to proceed further. Can anyone please help me?

when i am using

- name: Add mappings to /etc/hosts
  blockinfile:
    path: /home/s57232/Ansible-Install/Install_Inventory.txt
    content:  "{{ item.node_values }}"
    marker: "# {mark} ANSIBLE MANAGED BLOCK {{ item.node_values[0] }}"
  loop: "{{ tmpdata1 |json_query('nodes[*]') }}"

I am getting

# BEGIN ANSIBLE MANAGED BLOCK [test1]
['[test1]', '10.33.11.189', '10.33.11.185']
# END ANSIBLE MANAGED BLOCK [test1]
# BEGIN ANSIBLE MANAGED BLOCK [test2]
['[test2]', '10.33.11.189', '10.33.11.185']
# END ANSIBLE MANAGED BLOCK [test2]

my expectation is

# BEGIN ANSIBLE MANAGED BLOCK [test1]
[test1]
10.33.11.189
10.33.11.185
# END ANSIBLE MANAGED BLOCK [test1]
# BEGIN ANSIBLE MANAGED BLOCK [test2]
[test2]
10.33.11.189
10.33.11.185
# END ANSIBLE MANAGED BLOCK [test2]

What is your expectation?　・　Also, do not add code in comments, use edit link to change your question. — techraf
– techraf, Commented Sep 5, 2018 at 19:46

techraf · Accepted Answer · 2018-09-05 20:04:06Z

1

Here you are:

- name: Add mappings to /etc/hosts
  blockinfile:
    path: /home/s57232/Ansible-Install/Install_Inventory.txt
    content:  "{{ item.node_values | join('\n') }}"
    marker: "# {mark} ANSIBLE MANAGED BLOCK {{ item.node_values.0 }}"
  loop: "{{ tmpdata1.nodes }}"

You don't need to use JMESPath unless you wanted to filter some values. Other than that, you have two lists: one to loop over, the other to join the elements with a newline character.

edited Sep 5, 2018 at 20:04

answered Sep 5, 2018 at 19:56

techraf

69.2k30 gold badges211 silver badges215 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Sridhar Adurthi Over a year ago

Wonderful. you made my day. Thank you so much

Collectives™ on Stack Overflow

Arrays in Ansible

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related