[PYTHON] [Ansible installation procedure] From installation to execution of playbook

What you can achieve with this post

--Create Controller / Target node by node in Virtualbox --The range is from the controller to the Target by sending ansible playbook to the initial construction of the Target. --Change host name --Package installation (vim, git) --Ansible is installed as a module of virtualenv

Construction environment

Common

• Host OS : MacOS 10.9.5
• VirtualBox : 4.3.12
• Vagrant : 1.8.5

Constitution

• Control Node : 192.168.56.151
  • OS : CentOS 7.0
  • python : 2.7.5
  • ansible : 2.2
• Target Node : 192.168.56.152
  • OS : CentOS 7.0
  • python : 2.7.5

What is ansible?

Overview / Features

--Python configuration management automation tool --In the form of defining the termination condition, it is characterized by idempotent guarantee (some commands need to be guaranteed by themselves) --Highly readable in YAML format playbook --Since there is no agent, the introduction cost is low (it is OK if SSH and python are included in the management target) ――It goes well with the use of self-made scripts that have already been created. ――Module development / role development at 3rd Party is active, and most of what I want to do is in Documents / ansible-galaxy. - modules : http://docs.ansible.com/ansible/modules.html - roles : https://galaxy.ansible.com/ --Push type configuration management is common -Convert YAML format playbook to python and distribute / execute to managed target

ansible term

Environment

Controller / Target: Create general user (ansible)

Created by general users

useradd -s /bin/bash -m ansible
passwd ansible
#Grant sudo privileges
echo "ansible ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers.d/ansible

Controller: Public key authentication settings

su - ansible
cd ~
ssh-keygen
ssh-copy-id -i .ssh/id_rsa.pub 192.168.56.152 (Target Node IP address)

Controller: Install required packages

Install command

su - ansible
sudo yum -y install epel-release
sudo yum -y install gcc libffi-devel python-devel openssl-devel python-pip
sudo pip install --upgrade pip

#Not required if virtualenv is not used
sudo pip install virtualenv
#Not required if virtualenv is not used
cd ~
virtualenv venv
source venv/bin/activate

pip install "ansible==2.2"

Controller: Create working directory

Creating a working directory

su - ansible
cd ~
mkdir -p practice/{inventory,{group,host}_vars,roles,playbooks}
touch practice/{inventory/inventory.ini,group_vars/all.yml}

Controller: Creating an Inventory file

Creating an Inventory file

su - ansible
cd ~/practice
vim inventory/inventory.ini

inventory/inventory.ini

[practice_servers]
practice01 ansible_host=192.168.56.152 #Target Node 

Controller: Ansible communication confirmation

Communication confirmation

#Confirm that the server information of Target Node is returned as Response
ansible practice_servers -i inventory/inventory.ini -m setup

Controller: Playbook creation

Playbook creation

su - ansible
cd ~/practice
vim playbooks/initial_setting.yml

~/practice/playbooks/initial_setting.yml

---
- hosts: practice_servers
  become: yes #Implement sudo on Target server
  become_user: root　#Performed on behalf of the root user

  tasks:
    - name: 1. Set hostname
      hostname:
        name: practice01

    - name: 2. Install required packages
      yum:
        name: "{{ item }}"
      with_items: 
        - vim
        - git

Run playbook

Run playbook

su - ansible
cd ~/practice
ansible-playbook -i inventory/inventory.ini playbooks/initial_setting.yml

reference

Vagrantfile used for construction

Controller

Vagrant.configure("2") do |config|
  # Basic VM settings
  config.vm.box = "CentOS7.0"
  config.vm.box_download_insecure = true
  config.vm.hostname = 'controller'
  config.vm.network "private_network",ip:"192.168.56.151"
	config.vm.network :public_network, bridge: 'en0: Wi-Fi (AirPort)'
  config.vm.network :forwarded_port, id: "ssh", guest: 22, host: 2151
	config.ssh.insert_key = false

  # Virtual box setting
  config.vm.provider "virtualbox" do |vb|
    vb.customize ["modifyvm", :id, "--ostype", "Redhat_64"]
    vb.name = "ansible_controller"
    vb.memory = 512
    vb.cpus = 1
  end
end

Target_Node

Vagrant.configure("2") do |config|
  # Basic VM settings
  config.vm.box = "CentOS7.0"
  config.vm.box_download_insecure = true
  config.vm.hostname = 'practice'
  config.vm.network "private_network",ip:"192.168.56.152"
	config.vm.network :public_network, bridge: 'en0: Wi-Fi (AirPort)'
  config.vm.network :forwarded_port, id: "ssh", guest: 22, host: 2152
	config.ssh.insert_key = false

  # Virtual box setting
  config.vm.provider "virtualbox" do |vb|
    vb.customize ["modifyvm", :id, "--ostype", "Redhat_64"]
    vb.name = "practice"
    vb.memory = 512
    vb.cpus = 1
  end
end