curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
sudo git clone https://github.com/ahmetb/kubectx /opt/kubectx
sudo ln -sf /opt/kubectx/kubectx /usr/local/bin/kubectx
sudo ln -sf /opt/kubectx/kubens /usr/local/bin/kubens
curl -s https://raw.githubusercontent.com/k3d-io/k3d/main/install.sh | bash
echo "alias k=kubectl" >> ~/.bashrc
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc
source ~/.bashrc
k3d registry create mycluster-registry --port 5000
k3d cluster create mycluster --registry-use mycluster-registry:5000
kubens
sudo su -
echo "127.0.0.1 k3d-mycluster-registry" >> /etc/hosts
exit
sudo cat /etc/hosts
kubens
k get all
sudo apt-get update
sudo apt-get install python3-pip
sudo pip3 install virtualenv
sudo virtualenv venv
source venv/bin/activate
pip3 install -r requirements.txt
docker build -t welcome_image .
docker tag welcome_image k3d-mycluster-registry:5000/welcome_image:v0.1
docker push k3d-mycluster-registry:5000/welcome_image:v0.1
docker image ls
1.
python3 src/app.py
2.
docker run -p 9091:9091 k3d-mycluster-registry:5000/welcome_image:v0.1
3.
docker-compose up
4.
make run
5.
kubectl apply -f deployment.yml
kubectl get pod,svc
kubectl port-forward svc/app-welcome-svc 8080:9091
virtualenv -p python3 venv
source venv/bin/activate
pip3 install pytest
pip3 install pytest-html
pytest -v -s --junit-xml=report.xml --html=report.html (run all test cases in all files)
pytest -v -s -k 1st --junit-xml=report.xml (run only test cases having '1st' in the test case name in the all test files) -k <>
pytest -v -s -m smoke --junit-xml=report.xml (run only test cases maked as 'smoke' in the all test files) -m <>
Note 1: 'test_1stTest_4' will always be skipped
Note 2: fixture method setup() defined in conftest.py file will always be executed fisrt before the test related to that fixture,
so setup() method will be executed befote 'test_1stTest_fistureTest' and 'test_2ndTest_2' test run.
similarly we can wrap all tests (which are dependent on fixture method) into a class (see test_app3.py) and mark that class as usefixtures.
Note 3: we can pass data from fixture method also we can parametrize our test case (see conftest.py and test_app3.py)
=> Stop and remove all containers:
docker stop $(docker ps -q)
docker rm $(docker ps -aq)
docker image prune -a
=> Docker Debug:
docker logs [container_id]
docker exec -it [container_id] bash
docker inspect [container_id]
docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' [container_id]
docker stats
docker info
docker image ls
docker ps
kubectl get event
kubectl get pod <POD_NAME>
kubectl describe pod <POD_NAME>
kubectl explain pods <POD_NAME>
kubectl logs -f <POD_NAME>
To see cpu/memory load:
Kubectl top node
Kubectl top pod
Kubectl descibe PodMetrics <POD_NAME>
To Debug container:
Kubectl exec -it <POD_NAME> -- /bin/bash
Now since kubernetes v1.25 we can use Ephemeral Containers to debug application.
kubectl debug <POD_NAME> -it –image=alpine –target=<CONTAINER_NAME>
kubectl cp :</path/to/remote/file> </path/to/local/file>
To test if internet connectivity is there or not from pods:
kubectl run curl-test --image=curlimage/curl:latest --attach --quiet --restart=Never --rm -- \
curl --fail --show-error --silent --max-time 10 --head https://google.com
helm repo add argo https://argoproj.github.io/argo-helm
helm repo update
helm search repo argo
helm pull argo/argo-cd --version 5.26.0 --untar --untardir argocd
helm upgrade --install my-argo-cd argo/argo-cd --version 5.26.0 --dry-run
helm uninstall my-argo-cd
helm rollback my-argo-cd
helm ls
helm history
helm show
helm show values argo/argo-cd > values.yaml
helm dependency list
helm dependency update
helm template . --validate
helm template . --values values.yaml --debug
helm template . --values values.yaml --show-only templates/deployment.yaml | less
helm lint
yamllint <yaml file>