/k8s-deploy-note

k8s deploy note (digital ocean)

Warning

I just learned Kubernetes in one night. My notes are just for myself.

push image to registry

docker tag hello registry.digitalocean.com/hello/hello
docker push registry.digitalocean.com/hello/hello

connect cluster

doctl kubernetes cluster kubeconfig save {your-cluster}

check cluster

kubectl config get-contexts

create deployment

kubectl apply -f k8s/deployment.yaml

check pod

kubectl get pod

create service

In this case, use cluster ip

kubectl apply -f k8s/service.yaml

check srvice

kubectl get services

install ingress

In this case, k8s/nginx-values.yaml to expose custom port at load-balancer

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm repo update
helm install ingress-nginx ingress-nginx/ingress-nginx -f k8s/nginx-values.yaml
kubectl apply -f k8s/ingress.yaml

check ingress

kubectl get service --namespace default ingress-nginx-controller --output wide

install cert-manager

kubectl create namespace cert-manager
helm repo add jetstack https://charts.jetstack.io
helm repo update
helm install cert-manager jetstack/cert-manager --namespace cert-manager --version v1.10.1 --set installCRDs=true
kubectl apply -f k8s/issuer.yaml

check cert

kubectl describe certificate {your-cert}

auto scale

follow https://docs.digitalocean.com/products/kubernetes/how-to/set-up-autoscaling

kubectl apply -f k8s/hpa.yaml

check auto scale

kubectl top nodes
kubectl get hpa

Others

update nginx value

helm upgrade --install ingress-nginx ingress-nginx/ingress-nginx -f k8s/nginx-values.yaml

re-deploy

kubectl rollout restart deployment

Reference

https://www.digitalocean.com/community/tutorials/how-to-set-up-an-nginx-ingress-on-digitalocean-kubernetes-using-helm

https://serverfault.com/questions/1094259/how-do-i-create-a-kubernetes-service-that-routes-traffic-to-different-pods-based

https://docs.digitalocean.com/products/kubernetes/how-to/configure-load-balancers/