First Ansible

How to install - Ubuntu

apt-get install ansible

ansible --version

ansible 2.0.0.2
  config file = /etc/ansible/ansible.cfg
  configured module search path = Default w/o overrides

pip2 install ansible-lint

https://github.com/willthames/ansible-lint

ansible-lint is python tool that checks playbooks for practices and behaviour that could potentially be improved.

Ansible concept

ansible.cfg: Ansible config.

Inventory: Remote server information

Playbooks: It like a script that is you want to deploy your environment on remote server.

Task: contains the main list of tasks to be executed by the role.

Handler: To trigger serivce status，e.g. restart, stop service.

Role: Roles are ways of automatically loading certain vars_files, tasks, and handlers based on a known file structure.

Example project structure:

site.yml
webservers.yml
fooservers.yml
roles/
   common/
     tasks/
     handlers/
     files/
     templates/
     vars/
     defaults/
     meta/
   webservers/
     tasks/
     defaults/
     meta/

Prepare:

Managed Node
  • IP
  • User account
  • Set public SSH key on each node
  • Python > 2.7
Control Machine
  • vim /etc/ansible/ansible.cfg
[defaults]
host_key_checking = False

Let's GO: Hello world

Create an Ansible project
mkdir hello-world
cd hello-world
Inventory: Set host and managed node config
vim /etc/ansible/ansible.cfg

[defaults]
hostfile = hosts

nano hosts

[apache] # Group Name
192.168.10.100 ansible_ssh_user=wongyt
Test connection:
ansible apache -m ping                   #python2
python3 /usr/bin/ansible apache -m ping  #python3

192.168.10.100 | SUCCESS => {
    "changed": false,
    "failed": false,
    "invocation": {
        "module_args": {
            "data": "pong"
        }
    },
    "ping": "pong"
}
Playbook
nano playbook.yaml

---
- hosts: apache  # group name
  become: true   # use sudo
  tasks:         # task array
    - name: install apache2                              # task name
      apt: name=apache2 update_cache=yes state=latest    # apt is ansible module

    - name: enabled mod_rewrite
      apache2_module: name=rewrite state=present
      notify:
        - restart apache2

  handlers:
    - name: restart apache2
      service: name=apache2 state=restarte
Run ansible-playbook
ansible-playbook playbook.yaml                         # python2
python3 /usr/bin/ansible-playbook playbook.yaml        # python3

#if you have another inventory, you can use -i
python3 /usr/bin/ansible-playbook -i hosts playbook.yaml

Reference:

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