Ben Clayton Tech

Just a bunch of random stuff

DevopsKubernetes

Kubernetes Tips

  • kubectl get pods -n (namespace) | grep -v Running | grep -v Completed  – This will get a list of pods in a problem state.
  • kubectl describe pod (pod name) -n (namespace) – This will get additional info on the pod
  • kubectl get pods -n (namespace) –sort-by=.status.startTime – This will list pods by age
  • watch ‘kubectl get pods -n (namespace) | grep -v Running | grep -v Completed’ This will watch the pods come up and show which ones aren’t running or completed 
  • kubectl config use-context ## Switch the current context – a context is a set of Kubernetes resources or a cluster
  • kebectl get services  This will list all the services in the namespace
  • kubectl get pods –all-namespaces ##This will get all the pods in all the namespaces in a specific context

  • kubectl cluster-info  Get the information on the cluster
  • kubectl get nodes   Get the information on the nodes on the backend
  • kubectl create deployment (name) –image=repo/container
  • kubectl expose deployment (name) –port=80 –type=Nodeport
  • kubectl cluster-info dump  Dumps a ton of information about the cluster
  • kubectl get pv (get a list of persistent volumes)
  • kubectl get pv -o yaml (get a list of persistent volumes in yaml format)
  • spec:
  •    accessModes:
  •      – ReadWriteOnce
       capacity:
          storage: 3Gi
          hostPath:
             path: /mnt/data3
             type: “”
         persistentVolumeReclaimPolicy: Retain
         storageClassName: manual
         volumeMode: Filesystem
  • kubectl get pv –sort-by=.spec.capacity.storage
  • kubectl exec (pod) -n (namespace) — (exec). perform a command in a pod ..  for example kubectl exec benspod -n bensnamespace — cat /etc/resolv.conf
  • kubectl apply -f deployment.yml (creates a deployment based on a specific yaml file)
  • kubectl delete service (name.svc) -n (namespace)
  • You can either use Declarative text to spin up a deployment like the previous example or Imperative like this kubectl create deployment (deployment) — image=nginx
  • kubectl create deployment (deployment) –image=nginx –dry-run -o yaml
  • –dry-run -o yaml (Shows the output without actually creating the object in the cluster)
  •  

I just completed the Launch Single Node Kubernetes Cluster scenario on Katacoda! https://www.katacoda.com/courses/kubernetes/launch-single-node-cluster

 

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