Learn Terraform

Useful Resources

https://www.youtube.com/watch?v=E2pP1MOfo3g

Preamble

Install minikube as per the instructions online.
I tried using minikube kubectl ... for all the commands but some don't work.
If you come across this install kubectl - I used:

curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl

You'll then want to start the server with:

minikube start

Another thing you may want is bash auto-completion, see https://kubernetes.io/docs/tasks/tools/included/optional-kubectl-configs-bash-linux/

Checking status

minikube status

First steps

Reduce typing use alias k=kubectl

Then rehearse:

k version       # get version information
k cluster-info  # check cluster
k get all       # check what is running

Now start a simple pod with:

k create -f ./nginx-pod.yaml --save-config

NOTE: The --save-config adds the configuration into the annotations see this by: k get pod basic-nginx -o json
Now check what's running again with: k get all
Expose the port to the local machine using:

k port-forward pod/basic-nginx 8088:80

Now delight in your newly running nginx instance here: http://localhost:8088

More commands

k describe pod              # also gets events
k apply -f <filename>       # reconfigures or creates resources
k exec <pod-name> -it sh    # get a shell in the pod
k edit -f <filename>        # edit resource
k delete -f <filename>      # delete resource

Probes

Diagnostic to check what's happening in the pod using a probe, two types:

Liveliness
Readiness

Failed Pods are then subject to the restart policy.

Actions are of the following types:

ExecAction
TCPSocketAction
HTTPGetAction ... these actions can return Success, Failure or Unknown

This can be defined in the spec part of the YAML:

spec:
    containers:
    - name: basic-nginx
      image: nginx:alpine
      livenessProbe:
        httpGet:
          path: /index.html
          port: 80
        initialDelaySeconds: 15
        timeoutSeconds: 2
        periodSeconds: 5
        failureThreshold: 1