kube-ansible

Kubernetes Deployment with HAProxy Load Balancer using Ansible

This Ansible playbook is designed to automate the deployment of Kubernetes in a production environment, using HAProxy as the front-facing load balancer to distribute traffic among Kubernetes nodes for high availability and scalability.

Prerequisites

Before running this playbook, ensure you have the following prerequisites met:

• Ansible installed on your control machine.
• SSH access configured to all target nodes.
• Target nodes have internet access for downloading necessary packages.
• Python installed on all nodes for Ansible modules to execute properly.

Configuration

The playbook relies on inventory and variable files for configuration to match your specific environment requirements.

Inventory File

Update the inventory/k8s-servers.ini file to include the IP addresses or hostnames of your Kubernetes nodes under the appropriate groups. For example:

Variable Files

Customize variables in the inventory/group_vars/all.yml file (or any other variable file you're using) to fit your deployment settings, such as Kubernetes version, network settings, and HAProxy configuration.

Running the Playbook

Change your inventory file to inventory/k8s-servers.ini and put your hosts in it

For Install kubernetes you need some preinstall task, for preinstall follow these steps

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml  --become --become-method=sudo -t preinstall

After that you should install prerequired packages for kubernetes:

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml  --become --become-method=sudo -t k8s

For initialize kubernetes, follow these steps: (It's for new cluster)

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml  --become --become-method=sudo -t init_k8s

For join master(s) node to cluster, follow these steps:

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml  --become --become-method=sudo -t join_master

For join worker(s) node to cluster, follow these steps:

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml  --become --become-method=sudo -t join_worker

If you like to use haproxy for loadbalancing in your kubernetes you can use these bellow step.

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml --become --become-method=sudo -t lb

and for finilize use

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml --become --become-method=sudo -t postinstall

And also you can limit your task to specific host:

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml  --become --become-method=sudo -t join_worker -l k8s-test-worker1

Finaly you should run postinstall task:

ansible-playbook -i inventory/k8s-servers.ini kubernetes.yml  --become --become-method=sudo -t postinstall