/redis-operator-without-writing-any-code

redis-operator-without-writing-any-code

Usually, when you think about writing a k8s operator, you would probably head off to The Operator Framework and use their operator-sdk to get started right :) Only problem is that it requires you to code in Go.

That sounds complicated. I can't code. I'm just a YAML engineer. Can I still create an operator of my own?

I'm gonna show you how in this post.

Let's create a k8s cluster first

kind create cluster --name demo

To install kind, follow the instructions here.

Setup crossplane

helm repo add crossplane-stable https://charts.crossplane.io/stable
helm repo update
helm install crossplane --namespace crossplane-system --create-namespace crossplane-stable/crossplane --wait
# install kubectl crossplane plugin
curl -sL https://raw.githubusercontent.com/crossplane/crossplane/master/install.sh | sh
sudo mv kubectl-crossplane /usr/local/bin

Crossplane provider Helm: https://github.com/crossplane-contrib/provider-helm

kubectl crossplane install provider crossplane/provider-helm:master

Make them admin

SA=$(kubectl -n crossplane-system get sa -o name | grep provider-helm | sed -e 's|serviceaccount\/|crossplane-system:|g')
kubectl create clusterrolebinding provider-helm-admin-binding --clusterrole cluster-admin --serviceaccount="${SA}"
kubectl apply -f - <<EOF
apiVersion: helm.crossplane.io/v1beta1
kind: ProviderConfig
metadata:
  name: default
spec:
  credentials:
    source: InjectedIdentity
EOF

Create a new XRD type Redis

kubectl apply -f xrd/redis.yaml

Create a new Redis instance

kubectl apply -f my-redis-standalone.yaml
kubectl apply -f my-redis-replication.yaml