useful ansible stuff

useful-ansible-stuff

ansible-playbook install-jenkins.yml --list-tasks
ansible file directory layout
ansible/inventory/
    Production (group: dc1,dc2)
    development
    staging
    group_vars/
        all.yml
        webservers/
            secrets.yml
    host_vars/
Migrate_yaml_inventory.yml
- hosts: localhost
  gather_facts: false
  tasks:
   - template:
        src: dump_hosts_yaml.j2
        dest: /tmp/hosts.yml
{% set builtins = [‘hostvars’, ‘vars’, .....] %}
{% set dumped_var = [] %}
{% for group in groups if group != ‘all’ %}
{{group}}:
{%for myhostvar in hostvars[host] if myhostvar not in builtins %}
    {{ myhostvar}}:: {{hostvars[host] [myhostvar] | to_json }}
{% if loo.last %}{% do dumped_vars.append(host) %}{%endif %}
{% endfor %}
{% endfor %}
{% endfor %}
Varibale Sources
- role default
- inventory file vars
- inventory group_vars, host_vars
- playbook group_vars, host_vars
- host facts
- play vars, vars_prompt, vars_files
- registered vars
- set_facts
- role parameters and include vars
- block(only for tasks in block), task vars
- extra vars (CLI, global, precedence)
Single deployment script
#!/usr/bin/ansible-playbook
- hosts: localhost
  vars_prompt:
    - name: app_name
      prompt: ” Which app do you want to deploy?”
      default: mainapp
    - name: app_version
      prompt: “Choose version/tag (default HEAD)”
      default: ‘HEAD’
  tasks:
    - git: repo=git@myreposerver/{{ app_name }} version= {{ app_version}}
Parallel playbook execution
V1
time ansible-playbook play?.yml
time parallel ansible-playbook () ::: play?.yml
time $( ls play?.yml| xargs -nl -P3 ansible-playbook)
- name: really trying hard to aviod shell scripts v2
  hosts: localhost
  gather_facts: false
  tasks:
    - shell: ansible-playbook play1.yml
      async: 10000
      poll: 0
    - shell: ansible-playbook play2.yml
      async: 10000
      poll: 0
- name: really trying hard to aviod shell scripts v3
  hosts: localhost
  gather_facts: false
  tasks:
    - shell: ansible-playbook play{{item}}.yml
      async: 10000
      poll: 0
      with_items: [1,2,3]
      register: runplays
    - async_status: jid={{runplays.results[item.index].ansible_job_id}}
      register: jobs
      until: jobs.finished
      with_indexed_items: [1,2,3]
      retries: 100
Include_role
- hosts: localhost
  tasks:
    - packages: name={{httpd}} state=latest
    - Include_role:
        name: webapp
        tasks_from: install.yml
    - service: name={{httpd}} state=started
    - include_role:
        name: webapp
        tasks_from: configure.yml
        vars_from: “{{ansible_os}}.yml”
    with_items: “{{ applications }}”
Fun with Handlers
- host: all
  tasks:
    - name: configure nginx
      template: src=nginx.j2 dest=/etc/nginx.conf
      notify: restart_nginx_cluster
  handlers:
    - name: restart_nginx_cluster
      service: name=uwcgi state=restarted
      notify: restart_nginx
    - name: restart_nginx
      service: name=nginx state=restarted
- hosts: all
  tasks:
    - name: configure nginx
      template: src=nginx.j2 dest=/etc/nginx.conf
      notify: restart_nginx_cluster
  handlers:
    - name: restart_uwcgi
      service: name=uwcgi state=restarted
      listen: restart_nginx_cluster
    - name: restart_nginx
      service: name=nginx state=restarted
      listen: restart_nginx_cluster
- hosts: all
  tasks:
    - name: configure nginx
    template: src=nginx.j2 dest=/etc/nginx.conf
    notify: restart_nginx_cluster
  handlers:
    - name: restart_nginx_cluster
      include: nginx_cluster_restart.yml
      static: no
Separate logic from variables
- name: clone student lesson app for a users
    host: nodes
    vars:
        user_home: /home/{{ username }}
        user_ssh: “{{ user_home }}/.ssh”
        deploy_key: “{{user_ssh}}/id_rsa”
        app_dest: “{{ user_home }}/exampleapp”
    tasks:
        - name: create ssh directory
            file:
                state: directory
                path: “{{ user_ssh }}”
        - name Set Deployment key
          copy:
                src: file/deploy_key
                dest: “{{ deploy_key }}”
        - name: clone repo
            git:
                dest: “{{ app_dest }}”
                key_file: “{{ deploy_key }}”
                repo: [email protected]
                accept_hostkey: yes
                clone: yes
Ansible: properly copy local files within the target host
- set_fact:
    rsync_dry_run: “--dry-run”
  when: ansible_check_mode
- name: copy files within target host
  shell: rsync --itemize-changes --archive {{ rsync_dry_run | default(‘’) }} /src/directory/ /dest/directory/
  # always run
  check_mode: no
  register: rsync_result
  changed_when: rsync_result.stdout != ‘’
Check mode will show, whether the task is to change files, and files won’t be copied if they already are in place.
--itemize-changes makes rsync output a change-summary for every updated file.
Other options thay you may want to use with rsync in this task:
--update skip files that are never in destination
--ignore-existing do not update files that exist in destination
--checksum do not skip files based on mod-time and size, use checksum
print role name inside template
# Generated by ansible role: {{ role_path | regex_replace(‘^.*/([^/]+)$‘, ‘\\1’) }}
- name: added server host entry
  lineinfile: >
      dest=/etc/hosts
      line=“{{ ansible_eth0[‘ipv4’][‘address’] }}   {{  ansible_fqdn }} {{ ansible_hostname }}”
      state=present
- name: “generate /etc/hosts.ansible file”
  template: “src=etc/hosts.j2 dest=‘/etc/copyhosts.test’ owner=root group=root mode=0644"
  tags: etc_hosts
- name: “generate /etc/hosts.ansible file”
  template: “src=etc/hosts.j2 dest=‘/etc/hosts.test’ owner=root group=root mode=0644"
  tags: etc_hosts
# {{ ansible_managed }}
127.0.0.1   localhost
::1         localhost ip6-localhost ip6-loopback
# Network nodes as generated through Ansible.
{% for host in play_hosts %}
{% if ‘ansible_eth0’ in hostvars[host] %}
{{ hostvars[host][‘ansible_eth0’][‘ipv4’][‘address’] }}  {{ host }}
{% endif %}
{% endfor %}
#outputs for when
output.stdout.find(thomas)“” != -1
 - name: App | Cloning repos + submodules
      git: [email protected]:Organisation/{{ item.repo }}.git
           dest={{ item.dest }}
           accept_hostkey=yes
           force=yes
           recursive=no
           key_file=/home/user/.ssh/id_rsa.github-{{ item.repo }}
      with_items:
        -
          dest: “{{ destination }}”
          repo: PrimaryRepo
        -
          dest: “{{ destination }}/app/core”
          repo: SubmoduleRepo
register: db_migrations_result
      changed_when: “not db_migrations_result.stdout|search(‘No migrations to execute’)”
  when: test1.find(“World”) != -1
      when: ansible_distribution == “Ubuntu” and docker_version.stdout.find(“1.10”) == -1 and pip_version.stdout.find(“8.“) == -1 and docker_py_version.stdout.find(“1.“) == -1
######################################
“- name: Generate new root password
  command: openssl rand -hex 7
    creates: /root/.my.cnf
  register: mysql_new_root_pass
# If /root/.my.cnf doesn’t exist and the command is run
- debug: msg=“New root password is {{ mysql_new_root_pass.stdout }}”
  when: mysql_new_root_pass.changed
# If /root/.my.cnf exists and the command is not run
- debug: msg=“No change to root password”
  when: not mysql_new_root_pass.changed”
####################################################
- set_fact:
    files: “{{ lookup(‘fileglob’,‘path/to/*.tar.gz’,wantlist=true) | reject(‘search’,‘useless’) | list }}”
---
- name: “Creating multiple by checking folders”
  hosts: your_host_name
  tasks:
  - block:
    - name: “Checking folders”
      stat:
       path: “{{item}}”
      register: folder_stats
      with_items:
      - [“/var/www/f1”,“/var/www/f2",“/var/www/f3”,“/var/www/f4"]
    - name: “Creating multiple folders without disturbing previous permissions”
      file:
       path: “{{item.item}}”
       state: directory
       mode: 0755
       group: root
       owner: root
      when: item.stat.exists == false
      with_items:
      - “{{folder_stats.results}}”
#
Block styles with block chomping indicator (>-, |-, >+, |+)
You can control the handling of the final new line in the string, and any trailing blank lines (\n\n) by adding a block chomping indicator character:
>, |: “clip”: keep the line feed, remove the trailing blank lines.
>-, |-: “strip”: remove the line feed, remove the trailing blank lines.
>+, |+: “keep”: keep the line feed, keep trailing blank lines.
“Flow” scalar styles (, “, ’)
#
{% if variable is defined %}
    value of variable: {{ variable }}
{% else %}
    variable is not defined
{% endif %}