ansible tail file

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1

I want to start the nodes serially so I need to wait until I see “Confluence is ready to serve”. The search_regex looks at the entire file so I added part of the date. This only works when the application has not been restarted within the hour. Is there a better way to search a tail of a file?

2

Rename the log before you start, then you have a clean log file.

3

I found a solution on stacktrace:

vars:
  log_file_to_check: <path_to_log_file>
  wanted_pattern: <pattern_to_match>

tasks:
  - name: Get the contents of the last line in {{ log_file_to_check }}
    shell: tail -n 1 {{ log_file_to_check }}
    register: tail_output

  - name: Create a variable with a meaningful name, just for clarity
    set_fact:
      last_line_of_the_log_file: "{{ tail_output.stdout }}"

  ### do some other tasks ###

  - name: Match "{{ wanted_pattern }}" appearing after "{{ last_line_of_the_log_file }}" in {{ log_file_to_check }}
    wait_for:
      path: "{{ log_file_to_check }}"
      search_regex: "{{ last_line_of_the_log_file }}\r(.*\r)*.*{{ wanted_pattern }}"

but the last line confuses me. the \r(.\r).* in particular

4

I used an alternative approach, when I still maintained our Confluence instance.
My playbook was watching the socket where the JVM was listening on:

- name: create systemd startup script
  template:
    src: startup-systemd.j2
    dest: /etc/systemd/system/confluence.service
  register: service

- name: Reload service definition
  shell: 'systemctl daemon-reload'
  when: service.changed

- name: Ensure service is enabled
  service:
    name: confluence
    enabled: yes
    state: started

- name: Wait for JVM to come up
  wait_for:
    host: localhost
    port: 8090
    delay: 2
    timeout: 120
    state: started

5

Tested and it works. I just dont understand the syntax.