Learning Kubernetes

Summary

• what is kubectl
• where we use it
• configuration
• initial commands

Getting Started with Kubectl

What is kubectl

• cli tool to interface with kube control plane
• written in go
• available on windows, osx, linux

What is kubectl

• kubectl has a lot of subcommands
• Start with basics; learn more as we go

Why use kubectl?

• Everything can be done with API
• CLI frontend to API

Why use kubectl?

• Manual Troubleshooting, observation
• Automation

Getting Started with Kubectl

configuration

• tell kubectl what cluster to communicate with
• what credentials to communicate with
• can be configured to use kubectl with many different clusters and users

Important Components

• clusters
• credentials
• contexts

kubectl config

• set
• set-cluster
• set-credential
• set-context

Command Line

kubectl config --set-cluster ourcluster
--certificate-authority=./ourca.crt
--embed-certs=true
--server=https://ourserver.org:6443

kubectl config set-credentials admin-ourcluster
--token= eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9u...

kubectl config set-context ourcluster
--user=admin-ourcluster
--cluster=ourcluster