Developing and Orchestrating Microservices with Docker and Kubernetes - Day 2

Welcome to Day 2 of learning microservices! Today, we will focus on setting up Docker, which will be crucial for containerizing our microservices.

On Day 1, we introduced the concept of microservices, exploring their benefits and characteristics. You can find it here: https://shorturl.at/qsCG0

1. Docker Overview:

Docker is an open-source platform that simplifies the process of building, deploying, and managing applications using containerization. Containers provide lightweight, isolated environments that encapsulate an application and its dependencies.

2. Installing Docker:

- For Windows: Visit the Docker website (https://www.docker.com/get-started) and download the Docker Desktop for Windows installer. Follow the installation instructions provided.

- For Mac: Similarly, visit the Docker website (https://www.docker.com/get-started) and download the Docker Desktop for Mac installer. Follow the installation instructions.

3. Docker Terminology:

To work effectively with Docker, familiarize yourself with some key terms:

- Images: Read-only templates used to create Docker containers. Images contain the application code, runtime, libraries, and dependencies.

- Containers: Runnable instances of Docker images. Containers are isolated and have their own filesystem, networking, and processes.

- Dockerfile: A text file that contains instructions for building a Docker image. It defines the environment, dependencies, and steps to set up the application.

- Docker Compose: A tool for defining and running multi-container Docker applications. It uses YAML files to configure the services, networks, and volumes required for the application.

4. Basic Docker Commands:

Here are a few essential Docker commands to get you started:

- `docker run`: Runs a container based on a specific image.

- `docker build`: Builds a Docker image from a Dockerfile.

- `docker pull`: Pulls an image from a registry (e.g., Docker Hub).

- `docker images`: Lists the available Docker images on your system.

- `docker ps`: Lists the running Docker containers.

- `docker stop`: Stops a running container.

- `docker rm`: Removes a container.

5. Hands-on Exercise:

Now that you have Docker installed, let's try a simple exercise:

- Open a terminal or command prompt and run `docker run hello-world`. This command pulls the `hello-world` image from Docker Hub and runs it in a container.

- Explore other Docker commands, such as `docker images` and `docker ps`, to get a sense of the images and containers present on your system.

Take some time to experiment with Docker and get familiar with the basic commands. In the next session, we'll dive into containerizing our microservices using Docker.