Ansible Linux: installation, inventory file and sample command

sudo pip install markupsafe
sudo pip install xmltodict
sudo pip install pywinrm
sudo pip install ansible

ansible --version

inventory.yml
------------

---
[web]
192.168.57.3

group_vars/web.yml
-------------------
ansible_user: vagrant
ansible_password: vagrant
ansible_port: 5985
ansible_connection: winrm
ansible_winrm_cert_validation: ignore

ansible web -i inventory.yml -m win_ping

--------------------------------

for ubuntu:
sudo apt-get install ansible

for centos:
sudo yum install epel-release   --- enterprise linux softeare repos.
sudo yum install ansible

using python:
sudo yum install gcc
sudo yum install python-setuptools
sudo easy_install pip
sudo yum install python-devel
sudo pip install ansible

inventory file
-----------------
list of ip addresses

ansible all(or)*(or)ipaddress  -i inventory -u vagrant -m ping -k -v

-k --> for password prompt
-v --> debug or verbose mode, level 1
-vv --> level 2 debugging
similarly -vvv

if u get ssh error, theen do a ssh connection to that macchine once.
ssh username@ipaddress

command module:
--------
-m command -a "usr/sbin/yum update -y"

defualt is the command module, so we can skip -m
-a "/sbin/reboot"

command module will run an executable inside a python, shell module runs inside the shell directly, so we can use shell variables.

---


inventory file
===============
web1 ansible_ssh_host=ip_address ansible_ssh_user=user ansible_ssh_pass=password

ansible web1 -i inventory -m ping

inventory file
===============
web1 ansible_ssh_host=ip_address ansible_ssh_user=user ansible_ssh_pass=password
db1 ansible_ssh_host=ip_address ansible_ssh_user=user ansible_ssh_pass=password
web2 ansible_ssh_host=ip_address ansible_ssh_user=user ansible_ssh_pass=password

[webservers]--->group
web1
web2

[dbservers]
db1

[datacenter:children] -->children means contains groups instead of names
webservers
dbservers

ansible webservers -i inventory -m ping
ansible datacenter -i inventory -m ping

--


inventory file
===============
web1 ansible_ssh_host=ip_address
db1 ansible_ssh_host=ip_address

[webservers]
web1


[dbservers]
db1

[datacenter:children]
webservers
dbservers

[datacenter:vars]
ansible_ssh_user=vagrant
ansible_ssh_pass=vagrant