0. Basic Concepts

1. Images

1. Download

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docker search redis     # Search for an image
docker pull redis       # Pull the image, usually enough for most cases
docker pull redis:5.0.8 # Or pull a specific version

2. View and Delete

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docker images           # List locally downloaded images
docker rmi 'IMAGE ID'   # Delete a local image

2. Containers

1. Create and Run a Container

After the image is downloaded, use it to create a container:

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docker run -itd --name my_redis -p 6480:6379 redis --requirepass "password" # Create and run the container
docker ps -a    # List all containers

At this point Redis is installed successfully. Now let’s briefly break down the container creation command.

First, -itd, based on my own understanding:

• i enables input, so you can interact with the container after it starts.
• t attaches a terminal inside the container.

These two flags are commonly used together. If you want to understand the difference clearly, try creating three CentOS containers separately with -i, -t, and -it.

• d runs the container in the background after it is created.

--name my_redis gives the container a name.

-p 6480:6379 maps port 6379 inside the container, which is Redis’s default port, to port 6480 on the host. That means you can connect to Redis through 127.0.0.1:6480.

--requirepass "password" sets a password for Redis. If you only use Redis locally, you can choose not to set one.

2. Restart and Stop a Container

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docker stop 'CONTAINER ID'      # Stop a container
docker start 'CONTAINER ID'     # Start a container
docker restart 'CONTAINER ID'   # Restart a container
# 'CONTAINER ID' can also be replaced with the container name, such as "my_redis"

3. Delete a Container

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docker rm -f 'CONTAINER ID'     # Delete the container