Ansible tips and tricks

Tips and tricks

Ansible commandline

Get settings for host

Gathering settings for host in ${hostname}:

$ ansible -m debug -a 'var=hostvars[inventory_hostname]' ${hostname}

For example:

$ ansible -m debug -a 'var=hostvars[inventory_hostname]' localhost

Gathering facts from file

Variables from an Oracle response file

This snippet gets some variables from the response file and puts them into an environment variable oracle_environment and sets the variable name itself (prepended with oracle_ if not already there). The variable oracle_environment can be used for environment: when you use shell:.

  vars:
    oracle_user:          oracle
    oracle_version:       12cR2 
    oracle_response_file: /install/tepmplate_{{ oracle_version }}/db_{{ oracle_version | lower}}.rsp

  - name: "Getting variables for version {{ oracle_version }} from response file"
    shell: |
      awk -F '=' '/{{ item }}/{print $2;}' {{ oracle_response_file }}
    register: oracle_response_variables
    with_items:
      - ORACLE_HOME
      - ORACLE_BASE
      - INVENTORY_LOCATION
    tags:
      - oracle
      - oracle_install

  - name: Setting facts from response file to oracle_environment
    set_fact:
      "{{ 'oracle_' + item.item | lower | regex_replace('oracle_','') }}": "{{ item.stdout }}"
      oracle_environment: "{{oracle_environment|default([]) + [ {item.item: item.stdout} ] }}"
    with_items:
      - "{{ oracle_response_variables.results }}"
    tags:
      - oracle
      - oracle_install

Gathering oracle environment

  - name: Calling oraenv
    shell: |
           # Set ORAENV_ASK=NO and ORACLE_SID, ORACLE_HOME, PATH from /etc/oratab
           eval $(awk -F':' '!/^[ ]*(#|$)/ && $3=="Y"{printf "export ORAENV_ASK=NO ORACLE_SID=%s ORACLE_HOME=%s PATH=${PATH}:%s/bin\n",$1,$2,$2}' /etc/oratab)
           # Call /usr/local/bin/oraenv for additional settings
           . /usr/local/bin/oraenv -s
           # Just register what we need for Oracle
           env | egrep "(ORACLE_.*|PATH|LD_LIBRARY_PATH)="
    register: env
    changed_when: False

  - name: Creating environment ora_env
    set_fact:
      ora_env: |
           {#  Creating empty dictionary #}
           {%- set tmp_env={} -%}
           {#  For each line from env call tmp_env._setitem_(<variable>,<value>) #}
           {%- for line in env.stdout_lines -%}
           {{    tmp_env.__setitem__(line.split('=')[0], line.split('=')[1]) }}
           {%- endfor -%}
           {#  Print the created variable #}
           {{  tmp_env }}

  - debug: var=ora_env