Pods
Pod is the smallest unit of deployment to interact with in a K8s cluster.
Can be created/deleted/deployed
Represents one running process on your cluster
A pod contains:
Docker application container
Storage resources
Unique IP
Options to govern how containers should run
Features of a pod
Multiple Docker containers can run in a pod
Pod represents one single unit, a single instance of the application in K8s
It is tightly coupled and shares resources.
Ephemeral, disposable
Never self starts (by scheduler) or self heals
Higher level constructs to add pod stability called controllers
Pod States
Pending - accepted by K8s system, but container creation is pending
Running - scheduled on a node and all of its containers are created, with at least one in running state
Succeeded - all containers in the pod have exited with exit status 0 (successful execution, will not be restarted)
Failed - all containers in the pod have exited with exit status 0, but one failed with non-zero status
CrashLoopBackOff - container fails to start for some reason and K8s tries over n over again to restart
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