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03-client-tools.md

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Installing the Client Tools

First identify a system from where you will perform administrative tasks, such as creating certificates, kubeconfig files and distributing them to the different VMs.

If you are on a Linux laptop, then your laptop could be this system. In my case I chose the master-1 node to perform administrative tasks. Whichever system you chose make sure that system is able to access all the provisioned VMs through SSH to copy files over.

Access all VMs

Here we create an SSH key pair for the vagrant user who we are logged in as. We will copy the public key of this pair to the other master and both workers to permit us to use password-less SSH (and SCP) go get from master-1 to these other nodes in the context of the vagrant user which exists on all nodes.

Generate Key Pair on master-1 node

ssh-keygen

Leave all settings to default.

View the generated public key ID at:

cat ~/.ssh/id_rsa.pub

Add this key to the local authorized_keys (master-1) as in some commands we scp to ourself

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

Copy the output into a notepad and form it into the following command

cat >> ~/.ssh/authorized_keys <<EOF
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQD...OUTPUT-FROM-ABOVE-COMMAND...8+08b vagrant@master-1
EOF

Now ssh to each of the other nodes and paste the above from your notepad at each command prompt.

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:

Reference: https://kubernetes.io/docs/tasks/tools/install-kubectl/

Linux

wget https://storage.googleapis.com/kubernetes-release/release/v1.24.3/bin/linux/amd64/kubectl
chmod +x kubectl
sudo mv kubectl /usr/local/bin/

Verification

Verify kubectl version 1.24.3 or higher is installed:

kubectl version -o yaml

output

kubectl version -o yaml
clientVersion:
  buildDate: "2022-07-13T14:30:46Z"
  compiler: gc
  gitCommit: aef86a93758dc3cb2c658dd9657ab4ad4afc21cb
  gitTreeState: clean
  gitVersion: v1.24.3
  goVersion: go1.18.3
  major: "1"
  minor: "24"
  platform: linux/amd64
kustomizeVersion: v4.5.4

The connection to the server localhost:8080 was refused - did you specify the right host or port?

Don't worry about the error at the end as it is expected. We have not set anything up yet!

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