Kubernetes Best Practices to Know

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Kubernetes Best Practices to Know

Kubernetes is a powerful container orchestration platform that helps automate the deployment, scaling, and management of containerized applications. To ensure smooth operation and optimize your Kubernetes deployments, it’s essential to follow best practices.

Read Also – How to install Kubernetes with Kubeadm

Here are some Kubernetes best practices along with examples and images to illustrate them:

  1. Use Declarative Object Configuration:
    Instead of making manual changes to the cluster, define the desired state using declarative YAML or JSON configuration files. For example, here’s a YAML configuration file for a Deployment that creates three replicas of an application:
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: my-app-deployment
   spec:
     replicas: 3
     selector:
       matchLabels:
         app: my-app
     template:
       metadata:
         labels:
           app: my-app
       spec:
         containers:
           - name: my-app-container
             image: my-app-image:latest
Kubernetes Best Practices to Know
  1. Implement RBAC (Role-Based Access Control):
    Use RBAC to control access to your Kubernetes cluster. Define roles and permissions to restrict access based on user roles and responsibilities. For example, here’s an example of defining a role and role binding in a YAML configuration file:
   kind: Role
   apiVersion: rbac.authorization.k8s.io/v1
   metadata:
     name: my-role
     namespace: my-namespace
   rules:
   - apiGroups: [""]
     resources: ["pods", "services"]
     verbs: ["get", "list", "create", "update", "delete"]

   ---

   kind: RoleBinding
   apiVersion: rbac.authorization.k8s.io/v1
   metadata:
     name: my-role-binding
     namespace: my-namespace
   subjects:
   - kind: User
     name: john@example.com
   roleRef:
     kind: Role
     name: my-role
     apiGroup: rbac.authorization.k8s.io
  1. Utilize Namespaces Effectively:
    Create separate namespaces for different environments or projects. For example, you can create namespaces for development, staging, and production environments. Here’s an example of creating a namespace using the kubectl create namespace command:
   kubectl create namespace development
https://devopslover.com/how-to-install-kubernetes-with-kubeadm/
  1. Implement Network Policies:
    Use Kubernetes network policies to define rules for network traffic within your cluster. This helps control communication between pods and services. Here’s an example of a network policy that allows traffic only from pods labeled with app: my-app:
   apiVersion: networking.k8s.io/v1
   kind: NetworkPolicy
   metadata:
     name: my-network-policy
   spec:
     podSelector:
       matchLabels:
         app: my-app
     ingress:
     - from:
       - podSelector: {}
  1. Implement Pod Disruption Budgets (PDB):
    Define Pod Disruption Budgets to control the number of pods that can be evicted simultaneously during disruptions. This ensures application availability during updates. Here’s an example of a PDB that allows at least two replicas of a Deployment to be available:
apiVersion: policy/v1
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Mahesh Wabale
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