Table of contents
This blog post offers a clear explanation of key cloud technologies: Docker, Kubernetes, AWS, GCP, and Helm Charts. It explores what each tool does, how they work together, and provides real-world examples to illustrate their use cases. Additionally, the post includes common commands used with each tool for beginners to get started.
What are Docker/ Kubernetes/ Minikube/ Helm Charts/ AWS/ GCP?
Docker
A tool that packages applications and their dependencies into containers, making them easy to move and run anywhere.
Example: Imagine you're developing a website. With Docker, you can package your website code, database, and web server into a container. This container can then run on your laptop, your friend's computer, or a server in the cloud - always working the same way.
Kubernetes
A system for managing and scaling containerized applications across multiple servers.
Example: Let's say you have a popular mobile game. Kubernetes can help you manage multiple instances of your game servers. When more players join, Kubernetes can automatically start more game servers. When fewer players are online, it can shut down unnecessary servers to save resources.
Minikube
Minikube is a lightweight Kubernetes implementation that creates a VM on your local machine and deploys a simple cluster containing only one node. It's designed for users looking to try out Kubernetes or develop with it day-to-day on local machines.
AWS (Amazon Web Services)
A cloud computing platform offering various services like storage, databases, and computing power.
Example: Netflix uses AWS to store its vast library of movies and TV shows, and to stream content to millions of users worldwide. They don't need to build and maintain their own data centers - AWS provides the infrastructure.
GCP (Google Cloud Platform)
Similar to AWS, but provided by Google.
Example: Snapchat uses GCP to process the millions of photos and videos shared by its users every day. GCP provides the computing power and storage needed to handle this massive amount of data.
Helm Chart
A package manager for Kubernetes that helps you install and manage applications on a Kubernetes cluster.
Example: Let's say you want to set up a WordPress blog on Kubernetes. Instead of manually configuring everything, you can use a Helm Chart for WordPress. This chart will automatically set up the WordPress application, its database, and all necessary configurations in your Kubernetes cluster.
How are Docker/ Kubernetes/ Minikube/ Helm Charts/ AWS/ GCP related?
- Docker creates containers that can run on any system.
- Kubernetes manages these containers, helping them work together.
- Minikube: Local, single-node Kubernetes cluster for development and testing.
- AWS and GCP are cloud platforms where you can run Kubernetes and Docker containers.
- Helm Charts make it easier to install and manage applications on Kubernetes.
In simple terms
- Docker packages your app
- Kubernetes organizes and runs your app containers
- Minikube allows local Kubernetes development.
- AWS or GCP provide the computers to run everything
- Helm Charts help you set up apps on Kubernetes quickly
These technologies work together to make it easier for developers to create, deploy, and manage applications in the cloud.
Relationship example
Imagine you're launching a new social media app. You might:
- Use Docker to package your app
- Use Kubernetes to manage multiple instances of your app as it grows
- Run your Kubernetes cluster on AWS or GCP
- Use Helm Charts to easily deploy and update different components of your app (like the database, backend, and frontend) on Kubernetes
This combination allows you to easily scale your app to millions of users without having to manage individual servers yourself.
Common commands used for Docker, Kubernetes, Minikube, and Helm Chart
Docker Commands
- Build an image:
docker build -t my-image:tag . - Run a container:
docker run -d --name my-container my-image:tag - List running containers:
docker ps - Stop a container:
docker stop my-container - Remove a container:
docker rm my-container
Kubernetes Commands
- Apply a configuration:
kubectl apply -f my-config.yaml - Get pods:
kubectl get pods - Describe a pod:
kubectl describe pod my-pod - Create a deployment:
kubectl create deployment my-app --image=my-image:tag - Scale a deployment:
kubectl scale deployment my-app --replicas=3
Minikube commands
- Start Minikube:
minikube start - Stop Minikube:
minikube stop - Check status:
minikube status - Access Kubernetes dashboard:
minikube dashboard - SSH into Minikube VM:
minikube ssh - Get Minikube IP:
minikube ip - List addons:
minikube addons list - Enable addon:
minikube addons enable [addon-name] - Disable addon:
minikube addons disable [addon-name] - Delete Minikube cluster:
minikube delete - Use Docker daemon:
eval $(minikube docker-env) - Open service in browser:
minikube service [service-name] - Get Kubernetes config:
minikube kubectl -- get po -A - Update Minikube:
minikube update-check
Helm Chart Commands
- Install a chart:
helm install my-release my-chart - Upgrade a release:
helm upgrade my-release my-chart - List releases:
helm list - Uninstall a release:
helm uninstall my-release - Create a new chart:
helm create my-chart
These commands cover basic operations in each tool. Remember, there are many more commands and options available for each. As you work more with these technologies, you'll become familiar with additional commands and their specific use cases.
By understanding Docker, Kubernetes, AWS/GCP, and Helm Charts, developers can leverage the power of cloud computing to build, deploy, and manage applications more efficiently. This combination offers scalability, simplified management, and cost-effectiveness for modern cloud development.