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kubernetes-the-hard-way/docs/02-client-tools.md

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Installing the Client Tools

In this lab you will install the command line utilities required to complete this tutorial: cfssl, cfssljson, and kubectl.

Install CFSSL

The cfssl and cfssljson command line utilities will be used to provision a PKI Infrastructure and generate TLS certificates.

Download and install cfssl and cfssljson:

OS X

curl -o cfssl https://github.com/cloudflare/cfssl/releases/download/v1.4.1/cfssl_1.4.1_darwin_amd64
curl -o cfssljson https://github.com/cloudflare/cfssl/releases/download/v1.4.1/cfssljson_1.4.1_darwin_amd64

chmod +x cfssl cfssljson

sudo mv cfssl cfssljson /usr/local/bin/

Some OS X users may experience problems using the pre-built binaries in which case Homebrew might be a better option:

brew install cfssl

Linux

wget -q --show-progress --https-only --timestamping \
  -O cfssl https://github.com/cloudflare/cfssl/releases/download/v1.4.1/cfssl_1.4.1_linux_amd64
wget -q --show-progress --https-only --timestamping \
  -O cfssljson https://github.com/cloudflare/cfssl/releases/download/v1.4.1/cfssljson_1.4.1_linux_amd64

chmod +x cfssl cfssljson

sudo mv cfssl cfssljson /usr/local/bin/

Verification

Verify cfssl and cfssljson version 1.4.1 or higher is installed:

cfssl version

output

Version: 1.4.1
Runtime: go1.12.12

cfssljson --version

Version: 1.4.1
Runtime: go1.12.12

Install kubectl

The kubectl command line utility is used to interact with the Kubernetes API Server. Download and install kubectl from the official release binaries:

OS X

curl -o kubectl https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/darwin/amd64/kubectl

chmod +x kubectl

sudo mv kubectl /usr/local/bin/

Linux

wget https://storage.googleapis.com/kubernetes-release/release/v1.21.0/bin/linux/amd64/kubectl

chmod +x kubectl

sudo mv kubectl /usr/local/bin/

Verification

Verify kubectl version 1.21.0 or higher is installed:

kubectl version --client

output

Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.0", GitCommit:"cb303e613a121a29364f75cc67d3d580833a7479", GitTreeState:"clean", BuildDate:"2021-04-08T16:31:21Z", GoVersion:"go1.16.1", Compiler:"gc", Platform:"linux/amd64"}

Next: Provisioning Compute Resources