---
- name: Install webserver on 2 os and display directory contents
  hosts: localhost
  
  tasks:
  - name: Install httpd on redhat os
    yum:
      name=httpd
      state=latest
    when: ansible_os_family == "RedHat"
  - name: Install apache2 on ubuntu
    apt:
      name=apache2
      state=latest
    when: ansible_os_family == "Ubuntu"
  - name: List contents in /etc
      shell: ls /etc
      register: contents
  - name: Print /etc contents
      debug:
        msg: "This is a directory /file in /etc : {{ item }}"
      loop: "{{ contents.stdout_lines }}"

2. There are 2 environment DEV and QA. Both has their own group_vars. Using it, in Dev and QA environment(RHEL/CENTOS) install apache and Dev should run with 80 port and QA should run with 8080 port. Whereas config file locaton for apache conf is /etc/httpd.conf/conf/httpd.conf and line for port is “Listen 80”. This should be done using template module and zinja2 lib.

---
- name: Install dev and qa environment
  hosts: web
  vars_files:
    - ext-vars.yaml
	
  tasks:
  - name: Install httpd
    yum:
      name=httpd
      state=latest
    when: ansible_os_family == "RedHat"
  - name: Install apache2
    apt:
      name=apache2
      state=latest
    when: ansible_os_family == "Ubuntu"  

  - name: Template a file to /etc/file.conf
    ansible.builtin.template:
      src: httpd.conf.j2
      dest: /etc/httpd/conf/httpd.conf
     notify:
      - Start service httpd, if not started

  - name: Start service httpd, if not started
    ansible.builtin.service:
      name=httpd
      state=started

  handlers:
  - name: Start service httpd, if not started
    ansible.builtin.service:
      name=httpd
      state=restarted

2.  Create a playbook and setup a webserver(httpd) and use httpd as a variable decalared using prompt

---
- name: Setup httpd server
  hosts: web
  vars_prompt:
    - name: "packagename"
      prompt: "package-name"

   
  tasks:
  - name: Install httpd
    yum:
      name={{ packagename }}
      state=latest
  - name: Copy file with owner and permissions
    ansible.builtin.copy:
      src: index.html
      dest: /var/www/html/index.html
  - name: Start service httpd, if not started
    ansible.builtin.service:
      name={{ packagename }}
      state=started
  - name: Print the vars
    ansible.builtin.debug:
      msg: package {{ packagename }} installed

3. Create a playbook and setup a webserver(httpd) and find a list of .txt file in some directory and output using register variables

---
- name: Setup httpd server
  hosts: web
  vars:
    packagename: httpd
    servicename: httpd

    name: sreepada
	
  tasks:
  - name: Install httpd
    yum:
      name={{ packagename }}
      state=latest
  - name: Copy file with owner and permissions
    ansible.builtin.copy:
      src: index.html
      dest: /var/www/html/index.html
  - name: Start service httpd, if not started
    ansible.builtin.service:
      name={{ servicename }}
      state=started
  - name: Ansible register variable example
    shell: "find *.txt"
    args:
      chdir: "/home/centos/ansible/sreepada"
    register: find_output
  - debug:
      var: find_output.stdout_lines[0]

4. Create a playbook and setup a webserver(httpd), copy a index.html and interpolate variables in template file decalared in playbook.

---
- name: Setup httpd server
  hosts: web
  vars:
    myname: sreepada


    age: 23
  tasks:
  - name: Install httpd
    yum:
      name=httpd  
      state=latest	  
  - name: Start service httpd, if not started
    ansible.builtin.service:
      name=httpd
      state=started
  - name: Template a file to /var/www/html/
    ansible.builtin.template:
      src: index.html.j2
      dest: /var/www/html/index.html

Ansible is a configuration management tool where the server(s) (hardware and software)configurations can be automated. It is owned by RedHat and is open source and is written in python.

It is easy to use and can run on any machine (linux or windows) ad helps in managing server(s) configuration management

Ansible architecture components:

1.User —>Admin

2. ACS —> Ansible control server—> management node

3. ARS —-> Ansible Remote server (Host 1 ,2 ….n)

It has 3 main components of ACS:

1 . Ansible —> tool which should be installed on linux and has plugins , modules, executables, and config files embedded in it.

2. Ansible Inventory —-> It contains a list of ip addresses of ARS(Ansible remote server)

3. Ansible Playbook —> It is a script containing modules which runs on ARS