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](https://github.com/cloudflare/cfssl), [cfssljson](https://github.com/cloudflare/cfssl), and [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl).
## Install CFSSL
The `cfssl` and `cfssljson` command line utilities will be used to provision a [PKI Infrastructure](https://en.wikipedia.org/wiki/Public_key_infrastructure) and generate TLS certificates.
Download and install `cfssl` and `cfssljson` from the [cfssl repository](https://pkg.cfssl.org):
### OS X
```
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curl -o cfssl https://pkg.cfssl.org/R1.2/cfssl_darwin-amd64
curl -o cfssljson https://pkg.cfssl.org/R1.2/cfssljson_darwin-amd64
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```
```
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chmod +x cfssl cfssljson
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```
```
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sudo mv cfssl cfssljson /usr/local/bin/
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```
Some OS X users may experience problems using the pre-built binaries in which case [Homebrew](https://brew.sh) might be a better option:
```
brew install cfssl
```
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### Linux
```
wget -q --show-progress --https-only --timestamping \
https://pkg.cfssl.org/R1.2/cfssl_linux-amd64 \
https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
```
```
chmod +x cfssl_linux-amd64 cfssljson_linux-amd64
```
```
sudo mv cfssl_linux-amd64 /usr/local/bin/cfssl
```
```
sudo mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
```
### Verification
Verify `cfssl` version 1.2.0 or higher is installed:
```
cfssl version
```
> output
```
Version: 1.2.0
Revision: dev
Runtime: go1.6
```
> The cfssljson command line utility does not provide a way to print its version.
## 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/v1.10.2/bin/darwin/amd64/kubectl
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```
```
chmod +x kubectl
```
```
sudo mv kubectl /usr/local/bin/
```
### Linux
```
wget https://storage.googleapis.com/kubernetes-release/release/v1.10.2/bin/linux/amd64/kubectl
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```
```
chmod +x kubectl
```
```
sudo mv kubectl /usr/local/bin/
```
### Verification
Verify `kubectl` version 1.10.2 or higher is installed:
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```
kubectl version --client
```
> output
```
Client Version: version.Info{Major:"1", Minor:"10", GitVersion:"v1.10.2", GitCommit:"81753b10df112992bf51bbc2c2f85208aad78335", GitTreeState:"clean", BuildDate:"2018-04-27T09:22:21Z", GoVersion:"go1.9.3", Compiler:"gc", Platform:"linux/amd64"}
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```
Next: [Provisioning Compute Resources](03-compute-resources.md)