Kubernetes Network Policies Tutorial for Devops Engineers Beginners and Students
In kubernetes cluster, by default, any pod can talk to any other pod with no restriction hence we need Network Policy to control the traffic flow. Network policy resource allows us to restrict the ingress and egress traffic to/from the pods. Network Policy is a standardized Kubernetes object to control the network traffic between Kubernetes pods, namespaces and the cluster. However, Kubernetes itself does not provide an implementation of Network Policy, it is provided by Container Network Interface (CNI).
Network policies helps you control traffic flow at the IP address or port level i.e., OSI layer 3 or 4 i.e., network or transport layer.?
The Pod can communicate with are 3 other entities.
A. Other Pods,
B. Namespace,
C. IP blocks.
Hence, we use selector to create network policy to communicate with pods and namespaces but we use IP blocks CIDR ranges to create IP based network policies.
Kubernetes network policy is like a firewall in traditional network setup. configuring Kubernetes Network Policy is a simple, effective way for ensuring the network traffic flows as intended.
Let’s see an example, we have frontend UI pods and backend database pods. Now network policies help us controlling the direct traffic to our database pods so that only frontend pods can communicate with the backend database pods. Creating this network policy helped us controlling the unwanted access to our database pods.
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Kubernetes is a popular open-source platform for container orchestration. It enables developers to easily build containerized applications and services. Kubernetes also scale, schedule and monitor those containers. Kubernetes automates operational tasks of container management and includes built-in commands for deploying applications, rolling out changes, scaling up and down, monitoring applications, and more. Kubernetes makes it easier to manage your containerized applications.
To build an application you need to build a bunch of containers and then use Kubernetes to manage those containers. Kubernetes is a system that manages containers i.e., containerized applications where a container could be explained as a lightweight virtual machine.
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Major advantages of Kubernetes are as follow
1.??????Kubernetes Automates Container orchestration
2.??????Automatic Scaling Up and Down.
3.??????Strong Open-Source Communities.
4.??????Cost Efficiencies and Savings.
5.??????Ability to Run Anywhere.
6.??????Multi-Cloud Possibilities.
7.??????Improve Developer Productivity.
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