cluster.md

We administrate all our operations through the use of kubectl.

Prerequisites

Read up on the following materials,

• K8s Concepts

• kubectl cheatsheet

Requirements

• kubectl Installation Guide

Setup

To access the K8s cluster, you will need to have a k3s.yaml credential file. It can be obtained by ssh into the master node of the cluster, under the directory /etc/rancher/k3s/k3s.yaml.

Once you have obtained the k3s.yaml file, make the following modification,

# Update with the IP of the master node
- server: https://localhost:6443
+ server: https://123.123.123.123:6443

After the modification, this file is ready for use. Update your shell to always use this file,

export KUBECONFIG=/.../k3s.yaml

To confirm it working,

kubectl get pods --all-namespaces

Common Operations

See all nodes in cluster

kubectl get nodes

See a specific node

kubectl describe node robotics-rover1

See all deployed pods

• Notice that -n clouddesktop-prod refers to the clouddesktop-prod k8s namespace

kubectl -n clouddesktop-prod get pods

See a specific pod

kubectl -n clouddesktop-prod describe pod julianho-clouddesktop-deployment-abc123efg-123abc

Draining a node

kubectl drain robotics-rover2