Debugging with Skaffold

What You'll Learn

Deploying a local Kind Cluster
Understanding how to use Skaffold to build and debug

Kind is "Kubernetes in Docker". It allows for a quick local Kubnernetes cluster to be deployed runing inside a Docker container.

Skaffold is a continuous build and deployment tool for Docker images.

Install GO and configure a GOPATH

brew install golang
mkdir ~/gopath
export GOPATH=~/gopath

Install Kubectl cli tool.

brew install kubectl

Install the Kind Cluster

GO111MODULE="on" go get sigs.k8s.io/kind@v0.5.1
$(go env GOPATH)/bin/kind create cluster
export KUBECONFIG="$($(go env GOPATH)/bin/kind get kubeconfig-path --name="kind")"

Check the cluster build with docker ps

docker ps
CONTAINER ID        IMAGE                  COMMAND                  CREATED             STATUS              PORTS                                  NAMES
241d05b3344f        kindest/node:v1.15.3   "/usr/local/bin/entr..."   24 hours ago        Up 24 hours         63338/tcp, 127.0.0.1:63338->6443/tcp   kind-control-plane

Use kubectl to view the cluster

kubectl get pods --all-namespaces                          
NAMESPACE       NAME                                         READY   STATUS    RESTARTS   AGE
kube-system     coredns-5c98db65d4-2s9vm                     1/1     Running   0          24h
kube-system     coredns-5c98db65d4-q5jr8                     1/1     Running   0          24h
kube-system     etcd-kind-control-plane                      1/1     Running   0          24h
kube-system     kindnet-48f9b                                1/1     Running   1          24h
kube-system     kube-apiserver-kind-control-plane            1/1     Running   0          24h
kube-system     kube-controller-manager-kind-control-plane   1/1     Running   0          24h
kube-system     kube-proxy-55llz                             1/1     Running   0          24h
kube-system     kube-scheduler-kind-control-plane            1/1     Running   0          24h
skaffolddebug   skaffoldtest-79c9d68f79-48s7f                1/1     Running   0          4m32s

Building base

To build the base container used to build the example codelabs.

./build_base.sh

Install Skaffold

Install Skaffold cli tool.

brew install skaffold

Skaffold.yaml

If you open skaffold.yaml in the repo you can see it use the ./k8s/deployment.yaml Helm chart to deploy.

Deploying

Once the base is built you can deploy to the Kind cluster using Skaffold.

skaffold deploy

Continuous deployment

Skaffold allows for a continuous build and deployment. This works well for simple builds with small numbers of layer changes.

skaffold dev --port-forward

Verification

open http://localhost:8080

The page should look simiilar to the following picture.
Codelabs

NOTE: Use cmd+shift+r on Mac Chrome to refresh the cache

Building and deploying locally

You now have the ability to test create new codelabs, build and deploy them locally to a kubernetes cluster.