Book Image

kubectl: Command-Line Kubernetes in a Nutshell

By : Rimantas Mocevicius
Book Image

kubectl: Command-Line Kubernetes in a Nutshell

By: Rimantas Mocevicius

Overview of this book

The kubectl command line tool lets you control Kubernetes clusters to manage nodes in the cluster and perform all types of Kubernetes operations. This introductory guide will get you up to speed with kubectl in no time. The book is divided into four parts, touching base on the installation and providing a general overview of kubectl in the first part. The second part introduces you to managing Kubernetes clusters and working with nodes. In the third part, you’ll be taken through the different ways in which you can manage Kubernetes applications, covering how to create, update, delete, view, and debug applications. The last part of the book focuses on various Kubernetes plugins and commands. You’ll get to grips with using Kustomize and discover Helm, a Kubernetes package manager. In addition to this, you’ll explore how you can use equivalent Docker commands in kubectl. By the end of this book, you’ll have learned how to install and update an application on Kubernetes, view its logs, and inspect clusters effectively.
Table of Contents (16 chapters)
1
Section 1: Getting Started with kubectl
3
Section 2: Kubernetes Cluster and Node Management
6
Section 3: Application Management
10
Section 4: Extending kubectl

Installing kubectl

Let's take a look at how you can install kubectl on macOS, on Windows, and in CI/CD pipelines.

Installing on macOS

The easiest way to install kubectl on macOS is using the Homebrew package manager (https://brew.sh/):

  1. To install, run this:
    $ brew install kubectl
  2. To see the version you have installed, use this:
    $ kubectl version –client --short
    Client Version: v1.18.1

Installing on Windows

To install kubectl on Windows, you could use the simple command-line installer Scoop (https://scoop.sh/):

  1. To install, run this:
    $ scoop install kubectl
  2. To see the version you have installed, use this:
    $ kubectl version –client --short
    Client Version: v1.18.1
  3. Create the .kube directory in your home directory:
    $ mkdir %USERPROFILE%\.kube
  4. Navigate to the .kube directory:
    $ cd %USERPROFILE%\.kube
  5. Configure kubectl to use a remote Kubernetes cluster:
    $ New-Item config -type file

Installing on Linux

When you want to use kubectl on Linux, you have two options:

  • Use curl:
    $ curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
  • If your Linux system supports Docker images, use https://hub.docker.com/r/bitnami/kubectl/.

    Note

    Linux is a very common environment for CI/CD pipelines.