Instead of installing software manually in client/server machine manually will be using ansible for that in automated way.

For example: Need to install java and Maven in multiple machin, we can use ansible.

But with ansible just do the 
  >>  ssh setup between master and client machine where you want to do the configuration in automated way.
  >> create inventory file or host file which will be understanable by ansible and it will connect to those server and perform tasks.

Creating three servers:
====================  
  server 1    ===> master
  server 2 ,3 ==> node

    Step 1:   Generate ssh key on master and copy pub key of master to all node/client/slave machines.

    Step 2:   Install ansible only on master and not on nodes
    
    In master:
    
        amazon-linux-extras install ansible2

        check the ansible installation is done properly:

    Step 3:   create inventory file(either in /stc/ansible/ or in your local path-->name of the file -hosts) for mentioning the ipaddr of node machine
              
              /etc/ansible/hosts -- is called inventory file
    
              -- We will create a grouping 
              
                [webservers]
                node1ip
                node2ip

              -- its possible to give domain name in inventory file but location should be placed in /etc/hosts
    
    
    Step 4: Check with ping command in ansible for webservers connection

    Step 5: Play with Ansible adhoc commands for better understanding
    
     (Sample adhocs are >> Rebooting server >>managing files >> Managing Packages >> Managing user & groups >> Managing services >>Gathering facts)
     
     Sample adhoc for java installation:

    command: ansible -m yum -a 'name=java-1.8.0-openjdk state=present' webservers

    get_url:    ansible -m get_url -a 'url=https://downloads.apache.org/tomcat/tomcat-8/v8.5.61/bin/apache-tomcat-8. dest=/opt mode=0777' webservers

    unarchive:  ansible -m unarchive -a 'src=/opt/apache-tomcat-8.5.61.tar.gz dest=/opt remote_src=yes' webservers

- name: sample
  hosts: webservers
  remote_user: root   ===> remote user is root
  become: true        ===>  allowing root user to execute this playbook, if false then permission denied to remote user for execution 

Command: ansible-palybook -v ansible_practice1.yml --syntax-check

    Run https://github.com/logambigaik/ansible/blob/main/install-dockerpkg-in-ansible.yml to fix the issue.

Instal docker with pip  -for docker login issue

    - hosts: localhost
      tasks:
      - name: create
        docker_container:
            name: webappcontainer
            image: klogambigai/stackdemo:latest
            state: present
            exposed_ports:
            - 8000:80