Question 80841 in Docker Question posted in
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Ansible regexp that will change only found string instead of whole line – Docker

I’m trying to setup playbook that will setup some docker services. I’m trying to pass some variables that are obtained by vars_prompt to docker-compose file.

replace:
        path: files/docker-compose.yaml
        regexp: 'SERVER_IP'
        replace: '{{ ip_address }}'

Destination file

    environment:
      (...)
      SERVER_IP: 'SERVICE_IP_ADDR' 
      (...)

Right now such task replace whole line with ip_address variable

expected result

environment:
      (...)
      SERVER_IP: ip_address 
      (...)
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    After some test I've found solution for that.

    replace:
        path: files/docker-compose.yaml
        regexp: (s+)'SERVICE_IP_ADDR'(s+.*)?$
        replace: 1'{{ ip_address }}'2

  2. 0

    Instead of the modules replace or lineinfile, a more robust solution would be updating the dictionary. For example, given the file

    shell> cat files/docker-compose.yaml
environment:
  k1: v1
  SERVER_IP: 'SERVICE_IP_ADDR'
  k3: v3

    and the below variables

      dc_file: "{{ playbook_dir }}/files/docker-compose.yaml"
  ip_address: 10.1.0.10

    declare the dictionary dc_update

      dc_update:
    environment:
      SERVER_IP: '{{ ip_address }}'

    Include the content of the file into the dictionary dc

        - include_vars:
        file: "{{ dc_file }}"
        name: dc

    and declare the below variable

      docker_compose: "{{ dc|combine(dc_update, recursive=true) }}"

    This gives the updated configuration

      docker_compose:
    environment:
      SERVER_IP: 10.1.0.10
      k1: v1
      k3: v3

    Writes the updated configuration into the file

        - copy:
        dest: "{{ dc_file }}"
        content: |
          {{ docker_compose|to_nice_yaml(indent=2) }}

    Running the play with the --diff options gives

    TASK [copy] *******************************************************************
--- before: /export/scratch/tmp7/test-176/files/docker-compose.yaml
+++ after: /home/admin/.ansible/tmp/ansible-local-667065tpus_pfk/tmpnkohmmiz
@@ -1,4 +1,4 @@
 environment:
+  SERVER_IP: 10.1.0.10
   k1: v1
-  SERVER_IP: 'SERVICE_IP_ADDR'
   k3: v3

changed: [localhost]


    shell> cat files/docker-compose.yaml
environment:
  SERVER_IP: 10.1.0.10
  k1: v1
  k3: v3

    Notes:

    • Example of a complete playbook for testing
    - hosts: localhost

  vars:

    dc_file: "{{ playbook_dir }}/files/docker-compose.yaml"
    ip_address: 10.1.0.10
    dc_update:
      environment:
        SERVER_IP: '{{ ip_address }}'

    docker_compose: "{{ dc|combine(dc_update, recursive=true) }}"

  tasks:

    - include_vars:
        file: "{{ dc_file }}"
        name: dc

    - debug:
        var: docker_compose

    - copy:
        dest: "{{ dc_file }}"
        content: |
          {{ docker_compose|to_nice_yaml(indent=2) }}
    • You can use modules replace and lineinfile. See the examples below on how to get the expected result by matching the key SERVER_IP, the value SERVICE_IP_ADDR, or both. All options below give the same result
    --- before: /export/scratch/tmp7/test-176/files/docker-compose.yaml (content)
+++ after: /export/scratch/tmp7/test-176/files/docker-compose.yaml (content)
@@ -1,4 +1,4 @@
 environment:
   k1: v1
-  SERVER_IP: 'SERVICE_IP_ADDR'
+  SERVER_IP: '10.1.0.10'
   k3: v3

changed: [localhost]

    - hosts: localhost

  vars:

    dc_file: "{{ playbook_dir }}/files/docker-compose.yaml"
    ip_address: 10.1.0.10

  tasks:

    - replace:
        path: "{{ dc_file }}"
        regexp: SERVICE_IP_ADDR
        replace: "{{ ip_address }}"
      when: replace_by_value|d(false)|bool

    - replace:
        path: "{{ dc_file }}"
        regexp: "SERVER_IP:.*"
        replace: "SERVER_IP: '{{ ip_address }}'"
      when: replace_by_key|d(false)|bool

    - replace:
        path: "{{ dc_file }}"
        regexp: "SERVER_IP: \'SERVICE_IP_ADDR\'"
        replace: "SERVER_IP: '{{ ip_address }}'"
      when: replace_by_kv|d(false)|bool

    - lineinfile:
        backrefs: true
        path: "{{ dc_file }}"
        regexp: "^(.*)\'SERVICE_IP_ADDR\'$"
        line: "\1'{{ ip_address }}'"
      when: lineinfile_by_value|d(false)|bool

    - lineinfile:
        backrefs: true
        path: "{{ dc_file }}"
        regexp: "^(\s*)SERVER_IP:.*$"
        line: "\1SERVER_IP: '{{ ip_address }}'"
      when: lineinfile_by_key|d(false)|bool

    - lineinfile:
        backrefs: true
        path: "{{ dc_file }}"
        regexp: "^(\s*)SERVER_IP: \'SERVICE_IP_ADDR\'$"
        line: "\1SERVER_IP: '{{ ip_address }}'"
      when: lineinfile_by_kv|d(false)|bool

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