If you haven’t yet, check the first part here
K8 Architecture Summary Pt2
What happens when we submit a pod manifest to the API server?
Before any event, the Controler Manager, Scheduler and the Kubelet are in “watching mode” waiting for a new event for their respective resources types in the API Server
Deployment manifest created
Now you executed the command
kubectl create -f deployment.yaml
This happens next:
- The API Server verifies the Deployment specifications
- Stores it in etcd
- Returns a response to
After the following chain of events takes place
What a running pod is?
When we run
kubectl run nginx --image=nginx a few interesting things happens:
- Nginx container Running
- Pod Infrastructure Container (pause container) running
The Pause Container
The pause container is the container that holds all containers in the pod together. All containers in the pod share the same network and Linux namespaces, the Pod Infrastructure Container holds all these namespaces.