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My most used K8S commands

Deployments

kubectl get deployments -n <namespace>

You can hide headers with --no-headers

kubectl get deployments 
    --no-headers
    -n <namespace>

You can select custom columns, for example to show deployments with available replicas

kubectl get deployments
  -o custom-columns="NAME:.metadata.name, REPLICAS:.status.availableReplicas"
  -n <namespace>

Cron Jobs

kubectl get cronjobs -n <namespace>

You can check the last scheduled time, last successful time and suspended info for all cron jobs with : 

kubectl get cronjobs 
   -o custom-columns="NAME:.metadata.name, LAST_SCHEDULED:.status.lastScheduleTime, LAST_SUCCESSFUL=.status.lastSuccessfulTime, ON_HOLD:.spec.suspend"
   -n <namespace>

Jobs

kubectl get jobs -n <namespace>

You can get the latest jobs sorted by creation timestamp for a given cron job (by filtering by label)

kubectl get jobs 
    -l app.kubernetes.io/component=<cron-job-name>
    --sort-by=.metadata.creationTimestamp
    -n <namespace>

To return the latest job status for a given cron job, you can run the following command 

kubectl get jobs 
    -l app.kubernetes.io/component=<cron-job-name>
    --sort-by=.metadata.creationTimestamp
    -o jsonpath='{.items[-1].status.conditions[-1].type}'
    -n <namespace>

Trigger/Launch job

kubectl create job <job-name> 
    --from=cronjob/<cron-job-name>
    -n <namespace>

Pods

kubectl get pods -n <namespace>

You can get logs of a given pod 

kubectl get logs <pod-name> -n <namespace>

Tip : You can save terminal output with command > file.txt, for example 

kubectl get logs <pod-name> -n <namespace> > pod-logs.txt

Or you can even append it into an existing file with command >> existing-file.txt, for example 

kubectl get logs <pod-name> -n <namespace> >> pod-logs.txt

You can get more details about the pods with the following command : 

kubectl describe pod <pod-name> -n <namespace>