ANSIBLE| HAPROXY | LOADBALANCER

What is Ansible?

• Ansible is the simplest way to automate apps and IT infrastructure. Application Deployment + Configuration Management + Continuous Delivery

What is HAPROXY?

• HAProxy is free, open-source software that provides a high availability load balancer and proxy server for TCP and HTTP-based applications that spread requests across multiple servers.

What is Load Balancer?

•  Load balancing is the process of distributing network traffic across multiple servers

----------------------------------Architecture of HAPROXY----------------------------------------

We are going to create an Ansible playbook to Configure Reverse Proxy i.e. Haproxy and update its configuration file automatically each time a new Managed node.

In this practical, I used 4 EC-2 instances as shown in the below images and we are configuring a Load_balancer and two apache web-server.

In the ansible main, ANSIBLE is installed.

• Create an inventory file

[loadBalancer]
65.0.94.232 ansible_user=ec2-user ansible_connection=ssh

[Web]
13.126.196.102 ansible_user=ec2-user ansible_connection=ssh
13.233.31.153  ansible_user=ec2-user ansible_connection=ssh

Now to connect to all the ec2 instances we have to perform privilege escalation in the ansible configuration file ansible.cfg and also specify the private key to make a successful ssh connection.

Now let's create roles

First, let's understand what are roles in ansible.

• Roles provide a framework for fully independent, or interdependent collections of variables, tasks, files, templates, and modules

Create a directory mkdir /etc/ansible/roles

  ansible-galaxy init webserver


  asnible-galaxy init load_balancer

The above command will create two roles "webserver" and "Load_balancer"

The main playbook will contain

 hosts: web
  roles:
  - role: webserver



- hosts: LoadBalancer
  roles:
  - roles: load_balancer

• First, let's create a playbook for Web-Server in /etc/anisble/roles/webserver/tasks/main.yml

 - name:"Installing Httpd"
    package:
      name: "httpd"
      state: present
 - name: "copy the content"
   copy:
      src: "/root/ansible/webfiles/ansible.html"
      dest: /var/www/html/
 - name: "restart httpd"
   service:
      name: "httpd"
      state: started

• Install the HaProxy in the controller node.

yum install haproxy

In the configuration file of HaProxy, we are going to use port no 8080 for the Load_Balancer and we use Jinja and extract the hostname of each ec2 instance

{% for host in group['web'] %}
     server app{{ loop.index }}  {{ host }}:80 check
{% endfor %}

• Second, create a playbook for Load balancer inside /etc/anisble/roles/Load_Balancer/tasks/main.yml

- name: "Installing Haproxy"
  package:
     name: "haproxy"
     state: present
- name: "Copying the Haproxy file"
  template:
     src: "/root/ansible/haproxy/haproxy.cfg"
     dest: /etc/haproxy/
  notify: Load_balancer restart
- name: "restart haproxy"
  service:
     name: "haproxy"
     

     state: "started"

Now let's run the final playbook

Let's check if the Load_balancers are running or not.

First, I was connected to server 1 and then the server 2.

Reference - Amit Sharma

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