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Kubernetes Commands

Kubectl Commands

Create and run a config file

kubectl apply -f <>

List all resources

  • Need to specify namespaces
kubectl get all
kubectl get all -A
kubectl get pods -n ingress-nginx

kubectl port-forward

Information about service

kubectl describe

Port Forward

kubectl port-forward <service> <port>

Scale

kubectl scale <deployment.apps/> --replicas=2

Create Secret

kubectl get secrets
kubectl delete secret gitlab-registry

kubectl create secret docker-registry gitlab-registry \
--docker-server=registry.gitlab.com \
--docker-username=<> \
--docker-password=<>

Delete all

kubectl delete all --all

Create a database inside k8s-postgres

kubectl exec -it postgres-backend-0 -- psql -U admin -d postgres -c "CREATE DATABASE \"backend-pqsl-db\";"

kubectl exec -it postgres-backend-0 -- /bin/bash
psql -U admin postgres

Check resources

kubectl get pods --all-namespaces | grep metrics-server
kubectl top pod
kubectl top node
microk8s kubectl top pod <pod_name>

Restart Pod

kubectl delete pod my-pod
kubectl rollout restart deployment my-deployment

Helm

Setup

sudo snap install helm --classic

Add repo

helm repo add gitlab https://charts.gitlab.io

List repo

helm repo list

Search repo

helm search repo gitlab

Install a helm chart

helm install --namespace gitlab-runner gitlab-runner -f values.yaml gitlab/gitlab-runner
helm install

Uninstall helm

helm uninstall -n gitlab-runner gitlab-runner

Minikube

Setup

minikube start

Kubernetes dashboard

minikube addons list
minikube enable dashboard
minikube dashboard

Minicube Ip

E.g http://192.192.00.00:30000/

minikube ip

Ingress Controller

minikube addons enable ingress

Ingress

  • When tesing ingress locally
openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout backend.minikube.key -out backend.minikube.crt -subj "/CN=backend.minikube/O=backend"
kubectl create secret tls backend-tls-secret --key backend.minikube.key --cert backend.minikube.crt
echo "$(minikube ip) backend.minikube" | sudo tee -a /etc/hosts

Metrics

minikube addons enable metrics-server

Remove minikube

minikube delete
rm -rf ~/.minikube