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Home Cloud

Demystifying Serverless Computing: Understanding And Building Serverless Architectures

Paul Balo by Paul Balo
June 28, 2023
in Cloud, Research/How to do it
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4.1 Introduction to Kubernetes

In this section, we will explore the world of Kubernetes, an open-source container orchestration platform. Kubernetes simplifies the management and deployment of containerized applications at scale. Let’s dive into the basics:

  • Understanding Kubernetes: Kubernetes, often referred to as K8s, automates the deployment, scaling, and management of containerized applications. It provides a robust platform for running containers in a clustered environment. With Kubernetes, you can ensure high availability, scalability, and fault tolerance for your applications.
  • Kubernetes Architecture: Familiarize yourself with the key components and concepts of Kubernetes. The control plane, including the API server, controller manager, and scheduler, manages and orchestrates the cluster. Worker nodes, also known as minions, host the containers and execute application workloads. Explore other components such as etcd, which serves as the cluster’s distributed key-value store, and the kubelet, responsible for managing containers on each node.

Here are some command line tips to help you interact with Kubernetes:

  • Installing Kubernetes:
    • For local development and testing, you can use tools like Minikube or Kind.
    • For production environments, follow the installation instructions specific to your cloud provider or use Kubernetes distributions like Kubernetes (K8s) or Red Hat OpenShift.
  • Creating a Kubernetes Cluster:
    • For Minikube: minikube start
    • For Kind: kind create cluster
    • For cloud providers: Refer to their documentation for creating a cluster.

 

4.2 Deploying Containers with Kubernetes

Let’s explore how to deploy containerized applications on a Kubernetes cluster:

  • Creating Kubernetes Objects: Kubernetes uses declarative YAML manifests to define and deploy applications. Create Kubernetes objects such as Pods, Deployments, and Services using YAML files. Define the desired state of your application, including container specifications, resource requirements, and networking configurations.
  • Deploying Applications: Use the kubectl command-line tool to deploy your applications to the Kubernetes cluster. Run the command kubectl apply -f your-deployment.yaml to create and manage the desired resources. Monitor the deployment status using kubectl get pods and kubectl get deployments commands.
  • Scaling and Load Balancing: Kubernetes allows you to scale your application horizontally by adding or removing instances of Pods. Use the kubectl scale command to adjust the number of replicas in a Deployment. Implement load balancing with Services to distribute traffic across multiple Pods, ensuring optimal performance and availability.

Here are some command line tips for managing deployments and scaling:

  • Scaling a Deployment:
    • kubectl scale deployment your-deployment-name --replicas=3
  • Exposing a Deployment as a Service:
    • kubectl expose deployment your-deployment-name --port=80 --target-port=8080

 

4.3 Advanced Kubernetes Concepts

Let’s explore advanced concepts that enhance the capabilities of Kubernetes:

  • Service Discovery and Networking: Kubernetes provides built-in service discovery mechanisms. Learn about Services and Ingress resources to expose applications and manage traffic routing within the cluster. Explore different networking options, including ClusterIP, NodePort, and LoadBalancer, to suit your application requirements.
  • Persistent Storage and Stateful Applications: Kubernetes offers various options for persistent storage to support stateful applications. Explore PersistentVolumes and PersistentVolumeClaims to ensure data persistence across container restarts and node failures. Learn about StatefulSets, which enable managing stateful applications with stable network identities.
  • Rolling Updates and Fault Tolerance: Kubernetes supports seamless rolling updates, allowing you to update your applications without downtime. Learn how to update Deployments using strategies like RollingUpdate or Blue-Green deployments. Explore features like readiness and liveness probes to ensure fault tolerance and application health monitoring.

Command Line Tips for Advanced Kubernetes Concepts:

  • Creating a Service:
    • kubectl expose deployment your-deployment-name --type=LoadBalancer --port=80 --target-port=8080
  • Creating a PersistentVolumeClaim:
    • kubectl apply -f your-pvc.yaml
  • Updating a Deployment:
    • kubectl set image deployment/your-deployment-name your-container-name=your-image:tag


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Paul Balo

Paul Balo

Paul Balo is the founder of TechBooky and a highly skilled wireless communications professional with a strong background in cloud computing, offering extensive experience in designing, implementing, and managing wireless communication systems.

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