How does Kubernetes create a Pod?

When you create a pod in Kubernetes, what happens behind the scenes? How do Kubernetes components work together to generate that pod?

Deepen your knowledge of Kubernetes by understanding how a pod is created and maintained, a process which touches almost every major component in the Kubernetes cluster.

#Kubernetes #Pods #etcd

[ftate]

Great description. I really like that you chose a specific, isolated use case (pod creation), and then you describe exactly what's involved.

[rakeshsrinivasa]

The Best video which explained the Pod creation

[ashok]

I have been learning about Kubernetes for past one week and came across your video and it gave me an deep understanding about various stages of pod creation. Thanks much.

[seiyace]

i was looking for a simple explanation and it was soo difficult to find out. Thank you soo much for this video and the quality of your explanations!!

[Jaket]

This is the greatest video of all time for beginners in Kubernetes.

[aeytube]

honestly the best explanation over web!!

[ReflectionOcean]

Steps in creating a new pod:

1. A user submits a new configuration with kubectl to kube-API Server
2. Kube-API Server writes the configuration to etcd
3. Scheduler compares the configuration to actual state
4. Scheduler informs kube-API Server of which compute node(s) to schedule the workload
5. Kube-API Server requests corresponding Kubelets to create the new pod
6. Kubelet creates a new pod
7. Kubelets report latest status to kube-API Server
8. Kube-API Server updates the actual state in etcd

[AminSoftwareEngineer]

I noticed you didn't mention the Pod state during this process.
Here it is:
1. After Kube-API server returned "created" response to user, the pod's state will be "pending"
2. After scheduler set the node for that pod, Pod's state will be "creating"
3. After Kubelet created the pod, state will be "running"
4. If the pod is failing and restarting, state will be "Crash loop back off"

[aasthamohania]

Best and simple way how pod is created
Thanks a lot

[nishantgupta]

Surely one of the coolest way to explain k8s pod creation 👍👍

[sebastienpiller]

Great introduction to the architecture of k8s. Well explained and clear.

[TheSoulCrisis]

I love the logical processes you cool!

[bshman]

A great explanation, good didatic. Thanks for your contribution 👏

[ManhNguyen-ikkl]

thanks for your explanation. But i am still confused about pod and container. can you explain?

[gouravsalla]

I think one more thing needs to addressed here, that is CNI for communication between pods, we have several of them like weave, calico, flannel etc

[somesekhar]

The Scheduler & Control Manager relies entirely on the information supplied by the API server to execute their functions. In the event of the API server being unavailable, these components would also cease to function. The question arises: in a loosely coupled microservices environment, why do we have separate components that are dependent on others? Why can't the API server itself handle the tasks of both Control and Scheduler, eliminating the need for additional components with interdependencies?

[VijaykumarBisalahalli]

I was prepared for the question explain K8s architecture. But this question came in interview🙂

[ReflectionOcean]

kubelet does a few things:

1. register compute nodes
2. report status
3. start/stop workload

[ReflectionOcean]

kube-proxy is for communication between compute nodes

[SumitSharma-hdcl]

Is the actual state also stored in etcd ? How are the components aware of the actual state ?