lb.yml

#!/usr/local/bin/ansible-playbook
- hosts: backend
  tasks:
  - name: Install python in target nodes
    command:
      cmd: yum install python3 -y
      creates: /usr/bin/python3
  - name: Install httpd
    package:
      name: httpd
      state: present
  - name: Copy files
    copy:
      content: "I am {{ ansible_facts.default_ipv4['address'] }}"
      dest: /var/www/html/index.html
    notify: Restart httpd
  - name: Start firewall service
    service:
      name: firewalld
      state: started
      enabled: yes
  - name: Add firewall rule
    firewalld:
      port: 80/tcp
      immediate: yes
      permanent: yes
      state: enabled
  handlers:
  - name: Restart httpd
    service:
      name: httpd
      state: restarted
      enabled: yes

- hosts: lb
  vars:
    config_file: /etc/haproxy/haproxy.cfg
  tasks:
  - name: Install Python 3
    command:
      cmd: yum install python3 -y
      creates: /usr/bin/python3
  - name: Install HAProxy
    package:
      name: haproxy
      state: present
  - name: Bind haproxy with port 80
    replace:
      path: "{{ config_file }}"
      regexp: bind \*:5000
      replace: bind *:80
  - name: Removing predefined backend servers
    lineinfile:
      regexp: "    server  app.*"
      dest: /etc/haproxy/haproxy.cfg
      insertafter: "backend app"
      state: absent
  - name: Adding new backend servers
    lineinfile:
      line: "    server  {{ item }} {{ item }}:80 check"
      dest: "{{ config_file }}"
      insertafter: "backend app\n    balance"
    loop: "{{ groups.backend }}"
    notify: Restart haproxy
  - name: Start firewall service
    service:
      name: firewalld
      state: started
      enabled: yes
  - name: Add firewall rule
    firewalld:
      port: 80/tcp
      immediate: yes
      permanent: yes
      state: enabled
  handlers:    
  - name: Restart haproxy
    service:
      name: haproxy
      state: restarted
      enabled: yes