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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 public key infrastructure (PKI) and generate TLS certificates.

Download and install cfssl and cfssljson:

OS X

ARCH='arm64'  # replace arm64 with amd64 if needed

curl --location --output cfssl --time-cond cfssl \
  "https://github.com/cloudflare/cfssl/releases/download/v1.6.4/cfssl_1.6.4_darwin_${ARCH}"

curl --location --output cfssljson --time-cond cfssljson \
  "https://github.com/cloudflare/cfssl/releases/download/v1.6.4/cfssljson_1.6.4_linux_${ARCH}"

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

curl --location --output cfssl --time-cond cfssl \
  https://github.com/cloudflare/cfssl/releases/download/v1.6.4/cfssl_1.6.4_linux_amd64

curl --location --output cfssljson --time-cond cfssljson \
  https://github.com/cloudflare/cfssl/releases/download/v1.6.4/cfssljson_1.6.4_linux_amd64

sudo install --mode 0755 cfssl cfssljson /usr/local/bin/

Verification

Verify cfssl and cfssljson version 1.6.4 or higher is installed:

cfssl version

output

Version: 1.6.4
Runtime: go1.18

cfssljson --version

output

Version: 1.6.4
Runtime: go1.18

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 --location --remote-name --time-cond kubectl \
  "https://dl.k8s.io/release/v1.27.4/bin/darwin/${ARCH}/kubectl"

chmod +x kubectl

sudo mv kubectl /usr/local/bin/

Linux

curl --location --remote-name --time-cond kubectl \
  https://dl.k8s.io/release/v1.27.4/bin/linux/amd64/kubectl

sudo install --mode 0755 kubectl /usr/local/bin/

Verification

Verify kubectl version 1.27.4 or higher is installed:

kubectl version --client --short

output

Client Version: v1.27.4
Kustomize Version: v5.0.1

Next: Provisioning Compute Resources