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What is Pod in kubernetes. Explain 15 points with image as an example
- It is an atomic scheduling unit in a Kubernetes cluster.
- It is a logical unit.
- Every container running in the cluster nodes will be wrapped up by the POD.
- In one POD there can be multiple container running. It is called tight coupling.
- Prefered way is run one container in one POD. It is called loose coupling.
- Each POD will have its own IP address.
- There will be POD nw connecting all the PODS in a cluster irrespective of the nodes.
- Can communicate with each container by <POD IP>:<Container port>
- All the contaniers in a POD can share the POD environment like networking.
- PODs can specify the shared storage volumes and every container in the POD can access it.
- Inside the POD the containers can communicate using localhost.
- Containers with in the POD can also communicate using any IPC mechanism.
- Containers with in different PODs can’t communicate using any IPC mechanism, without some special configuration.
- POD has only two states: Pending and Running.
- PODs can’t be re-deployed. So all the data associated with PODS will be lost once, it is down.