Kubernetes
Kubernetes is an open-source container orchestration platform designed to automate the deployment, scaling, and management of containerized applications. Originally developed by Google, it is now maintained by the Cloud Native Computing Foundation (CNCF). Kubernetes allows developers to define application components and their relationships using declarative configuration files, making it easier to manage complex systems. It provides features such as automated rollouts and rollbacks, service discovery, load balancing, self-healing, and horizontal scaling. By abstracting the underlying infrastructure, Kubernetes enables consistent and efficient application operations across various environments, including on-premises data centers and public cloud platforms.
Kubernetes is an open-source container orchestration platform designed to automate the deployment, scaling, and management of containerized applications. Originally developed by Google, it is now maintained by the Cloud Native Computing Foundation (CNCF). Kubernetes allows developers to define application components and their relationships using declarative configuration files, making it easier to manage complex systems. It provides features such as automated rollouts and rollbacks, service discovery, load balancing, self-healing, and horizontal scaling. By abstracting the underlying infrastructure, Kubernetes enables consistent and efficient application operations across various environments, including on-premises data centers and public cloud platforms.
- Architecture and Core Concepts
- Clusters: A set of nodes (machines) running containerized applications.
- Nodes: Worker machines (physical or virtual) in a cluster.
- Control Plane: Manages the Kubernetes cluster (e.g., API server, scheduler, controller manager).
- Kubelet: Agent on each node that ensures containers are running.
- Workloads and Scheduling
- Pods: The smallest deployable unit; a group of one or more containers.
- Deployments: Manages stateless applications and ensures the desired number of Pods are running.
- StatefulSets: Manages stateful applications with persistent identity and storage.
- DaemonSets: Ensures a copy of a Pod runs on all (or some) nodes.
- Jobs & CronJobs: Run batch or scheduled tasks.
- Networking
- Services: Abstracts access to a set of Pods; includes ClusterIP, NodePort, LoadBalancer.
- DNS: Internal service discovery using DNS names.
- Ingress & Ingress Controller: Manages external HTTP/S access to services.
- Storage
- Volumes: Persistent storage attached to Pods.
- Persistent Volumes (PV) and Persistent Volume Claims (PVC): Decouples storage from Pod lifecycle.
- Storage Classes: Defines different types of storage (e.g., SSD, HDD).
- Configuration Management
- ConfigMaps: Inject configuration data into Pods.
- Secrets: Store sensitive information like passwords and tokens securely.
- Environment Variables: Pass config data into containers.
- Security
- RBAC (Role-Based Access Control): Controls access to cluster resources.
- Network Policies: Control traffic between Pods.
- Pod Security Standards: Enforce security guidelines at the Pod level.
- Service Accounts: Assign identities to Pods for API access.
- Monitoring and Logging
- Metrics Server: Provides resource usage data.
- Prometheus + Grafana: Popular monitoring stack.
- Logging Tools: E.g., Fluentd, Elasticsearch, Loki.
- Helm and Package Management
- Helm: Package manager for Kubernetes, helps deploy complex applications using “charts.”
- Scaling and Auto-healing
- Horizontal Pod Autoscaler: Scales Pods based on CPU or custom metrics.
- Cluster Autoscaler: Scales the number of nodes in a cluster.
- Liveness and Readiness Probes: Ensure Pods are healthy and ready to serve traffic.
- CI/CD Integration
- Integrates with Jenkins, ArgoCD, Flux, and other tools for continuous delivery pipelines.
What is Kubernetes?
Kubernetes is an open-source platform for automating the deployment, scaling, and management of containerized applications.
Who developed Kubernetes?
Originally developed by Google and now maintained by the Cloud Native Computing Foundation (CNCF).
What are containers?
Containers are lightweight, portable units that bundle application code with all dependencies, ensuring consistent environments across systems.
What is a Pod in Kubernetes?
A Pod is the smallest deployable unit in Kubernetes. It can contain one or more tightly coupled containers.
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