KubernetesImageCI

Description:
This Docker image sets up a Kubernetes node (either a master or a worker) using Alpine Linux as the base image. It includes all the necessary tools to initialize and manage Kubernetes clusters, such as kubectl, kubeadm, and kubelet, as well as Docker for container management.

This image simplifies the process of deploying Kubernetes clusters, either by initializing a master node or joining a worker node to an existing cluster. The role of the node (master or worker) is determined by environment variables passed during the container's runtime.

Key Features:

• Based on Alpine Linux: Small, efficient, and secure base image.
• Includes kubectl, kubeadm, and kubelet for Kubernetes management.
• Installs and runs Docker within the container for managing containers on Kubernetes nodes.
• Supports both master and worker node roles based on environment variables.
• Automatically sets up a Flannel network for Kubernetes pods when initializing a master node.
• Exposes necessary ports for Kubernetes operation (6443, 2379, 2380, etc.).

Usage:

1. Pull the image:

   docker pull ankoayfeno/kubernetes:latest```

2. Run the Image

The behavior of the container is determined by the environment variables:

To run as a master node:

```bash
docker run -d --name k8s-master \
-e NODE_ROLE=master \
-p 6443:6443 -p 2379:2379 -p 2380:2380 -p 10250:10250 \
ankoayfeno/kubernetes:latest```

To run as a worker node: provide the master node's IP, the token, and the discovery token hash

```bash
docker run -d --name k8s-worker \
-e NODE_ROLE=worker \
-e MASTER_IP=<master-ip> \
-e TOKEN=<your-token> \
-e DISCOVERY_HASH=<your-discovery-hash> \
ankoayfeno/kubernetes:latest```

Exposed Ports

• 6443: Kubernetes API server
• 2379-2380: etcd server client API
• 10250: Kubelet API
• 30000-32767: NodePort services