ansible

ansible 

First you have to ephel

enable ephel
--> yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

then update yum
--> yum update -y

Install ansible
---> yum install ansible -y
=============================================================================================================
/etc/ansible/hosts
hosts = inventories
inventories is two types
1. static inventory ------> we have to update all ip's in manually in host file
2. dynamic inventory------> It automatically updating ip's(by using scripts)

Modules
Ex: yum, git, usr
(search ad hoc commands in google)
ansible webservers -m yum -a "name=acme state=present"
module = yum
a = argumental
name = package service (ex. name=httpd, name=nginx)
state = present 
present = install
absent = remove
webservers ---- we defain webserver in hosts
======================================================================================================
to ping localhost
$ansible -m ping localhost

Install apache local server
---> ansible localhost -m yum -a "name=httpd state=present"

Start apache
----> ansible localhost -m service -a "name=httpd state=started"

install apache remote(slave) server 
you neeed ssh (password less) setup

first you have to backup host file in /etc/ansible/host
--->cp host host.backup

go to host and delate all data
then give onathor sarver Ip with group name
Ex:
[slave]
172.**.**.**

to check connection to onathor server 
----> ansible -m ping 172.**.**.** (or) ansible -m ping slave

to install apache in remote server(salve)
----> ansible slsve -m yum -a "name=httpd state=present"

to start apache in remote server(salve)
-----> ansible slave -m yum -a "name=httpd state=restarted"

it automatically installed apache in remote (slave) server