Name		Name	Last commit message	Last commit date
Latest commit History 10 Commits
config-maps		config-maps
consume-config-maps		consume-config-maps
deployment		deployment
docker		docker
env-from		env-from
env-variables		env-variables
external-service		external-service
host-path		host-path
ingress		ingress
init-containers		init-containers
persistant-volume		persistant-volume
resouces		resouces
scheduling		scheduling
secrets		secrets
services		services
README.md		README.md

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Kubernetes-traning

Namespace

export NAMESPACE=<your_namespace>
kubectl get namespaces
kubectl create namespace $NAMESPACE
kubectl config set-context kube-foundation --namespace=$NAMESPACE

Deployment

kubectl create deployment nginx --image=nginx
kubectl get deploy
kubectl get rs
kubectl get pods -o wide
kubectl get pods --show-labels
kubectl get deploy -o json
kubectl get deploy -o yaml
kubectl delete deploy nginx

From template

kubectl apply -f deployment/nginx_deployment.yaml --record
kubectl get deploy
kubectl rollout status deployment nginx
kubectl get rs
kubectl get pods -o wide --show-labels=true
kubectl describe deploy/nginx

Labels

kubectl label pod … app-
kubectl get pods -o wide --show-labels=true
kubectl label pod ... app=nginx

Service

Deploy busybox in default namespace

kubectl -n default create deploy busybox --image=yauritux/busybox-curl -- /bin/sh -c "while true; do sleep 30; done;"

Check DNS name

kubectl -n default exec -it $(kubectl -n default get pods | grep busybox | awk '{print $1}') sh
curl nginx.cdp
exit

Deploy service

cat services/nginx_service.yaml
kubectl apply -f services/nginx_service.yaml
kubectl get services
kubectl get ep
kubectl -n default exec -it $(kubectl -n default get pods | grep busybox | awk '{print $1}') sh
curl nginx.cdp

Headless service

cat services/nginx_headless_service.yaml
cat services/nginx_headless_service.yaml | kubectl replace --force -f -
kubectl -n default exec -it $(kubectl -n default get pods | grep busybox | awk '{print $1}') sh
curl nginx.cdp
nslookup nginx.cdp
cat services/nginx_service.yaml | kubectl replace --force -f -

External service

cat external-service/external_service.yaml
kubectl apply -f external-service/external_service.yaml
kubectl -n default exec -it $(kubectl -n default get pods | grep busybox | awk '{print $1}') sh
curl service.cdp
nslookup service.cdp
exit
cat external-service/external_ep.yaml
kubectl apply -f external-service/external_ep.yaml
kubectl -n default exec -it $(kubectl -n default get pods | grep busybox | awk '{print $1}') sh
curl service.cdp
exit

NodePort

kubectl patch svc nginx -p '{"spec": {"type":"NodePort"}}'
kubectl get svc

Ingress

cat ingress/nginx-ingress.yaml
kubectl apply -f ingress/nginx-ingress.yaml

Applications

Dry-run

kubectl create deployment nginx1 --image=nginx --dry-run=true
kubectl create deployment nginx1 --image=nginx --dry-run=true –o yaml > nginx.yaml

Environments

cat env-variables/nginx_deployment_env.yaml
kubectl apply -f env-variables/nginx_deployment_env.yaml
kubectl describe deploy nginx
kubectl exec -it $(kubectl get pods | grep nginx | awk '{print $1}' | head -1) bash
echo $DEMO_KUBERNETES

Envs from

cat env-from/nginx_deployment_envFrom.yaml
kubectl apply -f env-from/nginx_deployment_envFrom.yaml
kubectl describe deploy nginx
kubectl exec -it $(kubectl get pods | grep nginx | awk '{print $1}' | head -1) bash
env | grep NAMESPACE

Scheduling

Node selector

kubectl get nodes --show-labels
cat scheduling/nginx_nodeselector.yaml
kubectl apply -f scheduling/nginx_nodeselector.yaml
kubectl label node kube-slave2 type=node-selector
kubectl get pods -o wide
kubectl delete -f scheduling/nginx_nodeselector.yaml

Node affinity

cat scheduling/nginx_nodeaffinity_preffered.yaml
kubectl apply -f scheduling/nginx_nodeaffinity_preffered.yaml
kubectl get pods -o wide
cat scheduling/nginx_nodeaffinity_required.yaml
kubectl apply -f scheduling/nginx_nodeaffinity_required.yaml
kubectl get pods -o wide
kubectl label node kube-slave1 type=node-affinity
kubectl get pods -o wide
kubectl edit deployments nginx-node-affinity(show anti-affinity operator NotIn)
kubectl get pods -o wide
kubectl delete -f scheduling/nginx_nodeaffinity_required.yaml

Pod affinity

cat scheduling/redis_podantiaffinity.yaml
kubectl apply -f scheduling/redis_podantiaffinity.yaml
kubectl get pods -o wide
kubectl scale deployment redis-cache --replicas=4
kubectl get pods -o wide
kubectl scale deployment redis-cache --replicas=2
kubectl get pods -o wide
cat scheduling/webserver_podaffinity.yaml
kubectl apply -f scheduling/webserver_podaffinity.yaml
kubectl scale deployment web-server --replicas=4
kubectl get pods -o wide
kubectl delete -f scheduling/redis_podantiaffinity.yaml
kubectl delete -f scheduling/webserver_podaffinity.yaml

Taint and tolerations

kubectl get node kube-master -o jsonpath='{.spec.taints[]}{"\n"} '
kubectl get node kube-master -o jsonpath='{.spec.taints[?(@.key=="kubernetes.io/role")].value}{"\n"}'
cat scheduling/redis_toleration.yaml
kubectl apply -f scheduling/redis_toleration.yaml
kubectl get pods -o wide
kubectl scale deployment redis-cache --replicas=4
kubectl get pods -o wide
kubectl taint node kube-master cdp=test:NoSchedule
kubectl get pods -o wide
kubectl taint node kube-master cdp-
kubectl taint node kube-master cdp=test:NoExecute
kubectl get pods -o wide
kubectl taint node kube-master cdp-
kubectl delete -f scheduling/redis_toleration.yaml

Logs

kubectl logs $(kubectl get pods | grep nginx | awk '{print $1}' | head -1)

Compute resourses

cat resouces/nginx_resources.yaml
kubectl apply -f resouces/nginx_resources.yaml
kubectl describe pods $(kubectl get pods | grep nginx-resources | awk '{print $1}' | head -n 1)
kubectl delete -f resouces/nginx_resources.yaml

Deployment update

kubectl set image deploy nginx nginx=nginx:1.133 --record=true
kubectl rollout status deploy nginx
kubectl get pods
kubectl rollout history deploy nginx
kubectl rollout history deploy nginx --revision=2
kubectl rollout undo deploy nginx
kubectl rollout undo deploy nginx --to-revision=1

Kubectl explain

kubectl explain pods.spec.containers

Config maps

kubectl create configmap nginx-config --from-file=config-maps/index.html --from-literal=special.how=very
cat consume-config-maps/nginx_deployment_env.yaml
kubectl apply -f consume-config-maps/nginx_deployment_env.yaml
cat consume-config-maps/nginx_deployment_volume.yaml
kubectl apply -f consume-config-maps/nginx_deployment_volume.yaml

Secrets

kubectl create secret generic db-user-pass --from-file=username=secrets/username.txt --from-file=password=secrets/password.txt
kubectl get secret db-user-pass -o yaml
kubectl get secret db-user-pass -o jsonpath='{.data.password}‘
kubectl get secret db-user-pass -o jsonpath='{.data.password}' | base64 -d