Establishing SSH Connection between ANSIBLE-SERVER & NODES & pushing Files to NODES:

• Go to AWS account → Create 3 EC2 instances in same AZ

• take access of all machines via putty

• Now go inside ansible server and download ansible package

  • ec2-user
  • sudo su
  • wget

• now do ls

  • yum install epel-release-latest.7.noarch.rpm -y (epel = extra packages for enterprise linux)
  • yum update -y

• Now we have to install all the packages one by one

  • Yum install git python python-level python.pip openssl ansible -y

• Now go to hosts file inside ansible server and paste private-ip of node1 & node2

  • vi /etc/ansible/hosts

• Now this hosts file is only working after updating ansible.cfg file

  • vi etc/ansible/ansible.cfg

    uncommented

    inventory = /etc/ansible/hosts

    sudo-user = root

• Now create one user, in all the three instances

  • adduser ansible (ansible = username)

• Now sett password for this user

  • passwd ansible (ansible = username)

• Now switch as ansible user

  • su [ansible@ip] ansible

• this ansible user dont have sudo priviledges right now if you want to give sudo priviledge to ansible user

  • vi sudo

  • Now go inside this file,

    # # Allow root to run any commands anywhere
    root      ALL=(ALL)    ALL
    ansible   ALL=(ALL)  NOPASSWD: ALL
    

• Now do this thing in other nodes also

• Now go to ansible server and try to install httpd package as a ansible user

  • sudo yum install httpd -y

• Now, establish connection between server and node , go to ansible server

  • ssh 172.31.41.240

    o/p: permission denied

• Now we have to do some changes in sshd-config file go to ansible server

  • vi /etc/ssh/sshd_config

• Do some changes & saved the file

• Do this work in Node1 & Node2 also