Why do we need pod in Kubernetes?

Pods are designed to support multiple cooperating processes (as containers) that form a cohesive unit of service. The containers in a Pod are automatically co-located and co-scheduled on the same physical or virtual machine in the cluster.

What is difference between container and pod?

“A container runs logically in a pod (though it also uses a container runtime); A group of pods, related or unrelated, run on a cluster. A pod is a unit of replication on a cluster; A cluster can contain many pods, related or unrelated [and] grouped under the tight logical borders called namespaces.”

How do PODS communicate in Kubernetes?

How do Pods communicate in Kubernetes?

1. In Kubernetes, each Pod has an IP address. A Pod can communicate with another Pod by directly addressing its IP address, but the recommended way is to use Services.
2. In Kubernetes, each Pod has its own IP address.
3. Multiple containers in the same Pod share the same IP address.

How PODS are created in Kubernetes?

How to Create a Pod in Kubernetes. To begin, you need to launch a Kubernetes cluster. To create a pod using the nginx image, run the command kubectl run nginx –image=nginx –restart=Never . This will create a pod named nginx, running with the nginx image on Docker Hub.

How do pods communicate in Kubernetes?

How pods are created in Kubernetes?

How does flannel work in Kubernetes?

Flannel is an open-source virtual network project managed by CoreOS network designed for Kubernetes. Each host in a flannel cluster runs an agent called flanneld . It assigns each host a subnet, which acts as the IP address pool for containers running on the host.

How does pod to pod communication happen?

Pod-to-Pod communication (on same or across hosts) happens through ARP and L2 switching. We could use bridge CNI plug-in to reuse a L2 bridge for pod containers with the below configuration on node1 (note /16 subnet). kube-bridge needs to be pre-created such that ARP packets go out on the physical interface.