Learn Docker for free : Docker commands

Table of contents

• Basic Docker Commands

• Advanced Docker Commands

• Docker Tips and Tricks

• Best Practices

• Troubleshooting Tips

Docker has revolutionized the way we develop, test, and deploy applications by providing a lightweight and portable way to package software. As you start working with Docker, it's essential to familiarize yourself with its powerful command-line interface (CLI). In this blog post, we'll delve into the world of Docker commands, sharing tips, tricks, and best practices to help you master the art of containerization.

Basic Docker Commands

Before diving into advanced topics, let's cover some basic Docker commands:

• docker run: Run a new container from an image.

"docker run -it <image_name>"

Replace <image_name> with the name of the image you want to run (e.g., ubuntu:latest).

• docker ps: List all running containers.

"docker ps"

• docker stop: Stop a running container.

"docker stop <container_id>"

• docker rm: Remove a stopped container.

"docker rm <container_id>"

• docker images: List all available Docker images on your system.

"docker images"

Advanced Docker Commands

Now that you're comfortable with the basics, it's time to explore some advanced Docker commands:

• docker run -d: Run a container in detached mode (background).

"docker run -d <image_name>"

• docker exec: Execute a command inside a running container.

"docker exec -it <container_id> <command>"

• docker cp: Copy files between the host machine and a container.

"docker cp <host_file> <container_id>:/<container_path>"

• docker inspect: Inspect the details of a container or image.

"docker inspect -f '{{range .Config.Volumes}}{{println .}}' <image_name>"

• docker network: Manage Docker networks (e.g., create, list, and delete).

"docker network create my_network"

Docker Tips and Tricks

Here are some valuable tips to help you get the most out of Docker:

1. Use the it flag: When running a container, use the it flag to allocate a pseudo-TTY and keep the container's stdin open.

2. Use environment variables: Use environment variables to pass configuration values to your containers.

3. Mount volumes: Mount host directories as read-write or read-only volumes inside containers using the v flag.

4. Port mapping: Map container ports to host ports using the p flag.

5. Use Docker Compose: Manage complex applications with multiple services using Docker Compose.

Best Practices

To get the most out of Docker, follow these best practices:

1. Use a consistent naming convention: Use a consistent naming scheme for your containers and images to avoid confusion.

2. Keep track of container IDs: Keep track of container IDs for easy management (e.g., stopping or removing containers).

3. Regularly update Docker: Regularly update Docker to ensure you have the latest features and security patches.

4. Use a Dockerfile: Use a Dockerfile to define your application's build process and create reproducible images.

5. Monitor system resources: Monitor system resources (e.g., CPU, memory, and network usage) when running multiple containers.

Troubleshooting Tips

When things go awry, use these troubleshooting tips:

1. Check the Docker logs: Check the Docker logs for errors or warnings using "docker logs <container_id>".

2. Use the a flag: Use the a flag with the docker run command to see all output from a container.

3. Inspect container details: Use docker inspect to examine container details, such as environment variables and volumes.

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Suggested by Srinivas B K

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