Demystifying Serverless Computing: Understanding And Building Serverless Architectures

5.1 Serverless Containers

Serverless computing and containerization are two powerful technologies that can be combined to unlock even greater capabilities. Let’s explore this exciting combination:

• Exploring Serverless Containers: Serverless containers bring together the agility and scalability of serverless computing with the flexibility and portability of containers. By packaging serverless functions as containers, we can leverage the benefits of both paradigms. Serverless containers offer improved resource utilization, faster cold starts, and simplified deployment workflows.
• Benefits and Use Cases: The marriage of serverless and containers offers several benefits. It enables developers to leverage existing containerized applications and libraries in a serverless context, reducing development effort. Serverless containers also provide consistent execution environments, making it easier to manage dependencies and ensure reproducibility. Use cases for serverless containers include web applications, API services, event-driven processing, and more.

Command Line Tips for Serverless Containers:

• Building a Serverless Container:
  • Use your preferred container build tool (Docker, Buildah, etc.) to create a container image for your serverless function.
  • Example: docker build -t your-container-image:tag .
• Deploying a Serverless Container:
  • Utilize serverless platforms like Knative or OpenFaaS to deploy serverless containers on Kubernetes clusters.
  • Example: kubectl apply -f your-serverless-manifest.yaml

5.2 Kubernetes-based Serverless Platforms

Let’s explore some popular serverless platforms specifically designed for Kubernetes:

• Knative: Knative is an open-source serverless platform built on top of Kubernetes. It provides a set of components to deploy, manage, and scale serverless workloads. Knative allows you to deploy serverless functions as containers and automatically scales them based on incoming request traffic. It also offers event-driven capabilities for seamless integration with other services.
• OpenFaaS: OpenFaaS (Functions as a Service) is another Kubernetes-based serverless platform. It allows you to package functions as containers and deploy them on Kubernetes clusters. OpenFaaS provides a user-friendly experience for building, deploying, and scaling serverless functions. It supports multiple programming languages and offers a rich ecosystem of community-contributed functions.

Command Line Tips for Kubernetes-based Serverless Platforms:

• Installing Knative:
  • Follow the official Knative installation guide for your Kubernetes cluster.
  • Example: kubectl apply -f https://github.com/knative/serving/releases/download/v0.29.0/serving-crds.yaml
• Deploying a Serverless Function with Knative:
  • Use kn (Knative CLI) to deploy your serverless function on a Knative service.
  • Example: kn service create your-function --image=your-container-image:tag
• Installing OpenFaaS:
  • Follow the official OpenFaaS installation guide for your Kubernetes cluster.
  • Example: kubectl apply -f https://github.com/openfaas/faas-netes/releases/download/v0.13.0/namespaces.yml
• Deploying a Serverless Function with OpenFaaS:
  • Use the OpenFaaS CLI (faas-cli) to deploy your serverless function on an OpenFaaS gateway.
  • Example: faas-cli up -f your-function.yml