K8s-MyTips.txt

for the autocomplete
source <(kubectl completion bash | sed 's/kubectl/k/g')

#see all the parameters very usefull than k8s docs
kubectl explain pods.spec.containers --recursive | less
kubectl explain services.spec --recursive | less

#get the pod events
k describe pod hazelcast | grep -i events -A 10

k api-resources -o wide

#no need to wait for the pod to be deleted 
kubectl delete po <pod name> <optional -n namespace> --wait=false

kubectl run busybox --image=busybox:1.28 --command sleep 7000 -o yaml --dry-run=client  > busybox.yaml

all about 1.18

export do="--dry-run=client -o yaml"
k run pod1 --image=nginx $do

k run pod1 --image=busybox -oyaml --dry-run=client

kubectl expose deployment webapp --type=LoadBalancer --name=web-service

#creating a new namespace 

kubectl create ns web

#create a deployment using webfront

k create deploy webfront-deploy --image=nginx:1.7.8  --dry-run -o yaml >webfrontpod.yaml

	kubectl create deployment nginx --image nginx --dry-run=client -o yaml > deploy.yaml  edit deploy.yaml for any replica number changes and apply to create a deployment with 2 replicas.
	
    kubectl run nginx --image=nginx --dry-run=client -o yaml > pod.yaml  to create a pod as pod.yaml
	
    kubectl expose pod/deployment --name nginx-service --type ClusterIP --port 80 --target-port 80 --dry-run=client -o yaml > svc.yaml to expose a pod or deployment
		
    kubectl create secret generic db-secret --from-literal=password=confidential  (no need to encode the secret, its encoded on its own this way)
	
    journalctl -u kubelet to get kubelet service logs
		
    systemctl status kubelet , systemctl restart kubelet  and systemctl daemon-reload
		
    kubeadm init --config=/location/of/kubeadm.config  to create a kubeadm cluster with provided config

    /etc/systemd/system/kubelet.service.d

    journalctl -u kube-controller-manager.service --no-pager | tail -50
 
    journalctl -u kube-scheduler.service --no-pager | tail -50

    k auth can-i watch pods --as=john --namespace=development

    my custom coloums
    kubectl -n admin2406 get deployment -o custom-columns=DEPLOYMENT:.metadata.name,CONTAINER_IMAGE:.spec.template.spec.containers[].image,READY_REPLICAS:.status.readyReplicas,NAMESPACE:.metadata.namespace --sort-by=.metadata.name > /opt/admin2406_data