ANSIBLE

 

What is ansible ?

It is a configuration management tool , open source .

Uses YAML scripting .

Works on push management .

Required architecture :

We need to create 1 master node and 3 server nodes

Create an instance ,

Instance name : ansible_master

Select ubuntu server 22.04 as amazon machine image .

Allocate port — 22

Launch the instance ,

we have launched 1 master node , we need 3 server nodes

select the instance > actions > image and templates > launch more like these

Launch 3 instances with the same configurations ,

And launch instance

Change the name of the 3 — instances ,

Connect to the ansible master instance ,

Click on the instance > connect

Use command ,

sudo apt update

Now install ansible ,

After configuring the master , we need to ssh with the nodes (node 1 , node 2, node 3)

Now lets connect with ansible_server_2 ,

Go to the master server ,

use command

ssh-keygen to generate id_rsa.pub

Copy the key from id_rsa.pub

Now go to the ansible _server_2 instance ,

Go to .ssh > authorized_keys

And paste the public key here ,

Save and exit.

Do the same for ansible_server_1 and ansible_server_3 ,

Copy and paste the key from id_rsa.pub(ansible_master) — authorized_keys (ansible_server_1)

Copy and paste the key from id_rsa.pub(ansible_master) — authorized_keys (ansible_server_3)

Now go to the ansible_master

Use the command ,

ssh ubuntu@52.221.219.146 (public ip address of ansible_server_2)

Now we have connected from one server to another server , this is called secured shell (ssh).

Now we have to create an inventory file ,

Go to ansible and create hosts ,

vim hosts

Now add the servers inside the inventory ,

Now the servers are ready in the inventory .

To install python by default in all the servers ,

Save and exit .

Now lets check if the inventory / host file is correct ,

ansible-inventory — list -y

We get this error because our host file is in different directory ,

/home/ubuntu/ansible

Use the command ,

ansible-inventory — list -y -i /home/ubuntu/ansible/hosts

we have got all the details of the server .

Now lets ping all the servers with a module .

What is module ?

module is a command or set of commands to be executed on client side .

ansible all -m ping -i /home/ubuntu/ansible/hosts

Now to check memory usage ,

ansible all -a “free -h” -i /home/ubuntu/ansible/hosts

To check server uptime ,

ansible servers -a “uptime” -i /home/ubuntu/ansible/hosts

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