What methods does docker use to identify containers?

Docker uses the following four methods to identify containers: 1. Unique and immutable 64-bit container ID; 2. Customizable container name; 3. Marking different versions of Docker image labels; 4. Container ports map to host ports.

Docker uses the following 4 ways to identify containers:

1. Container ID

• Each container has a unique, randomly generated 64-digit hexadecimal string ID.
• This ID is assigned when the container is created and remains unchanged throughout the container life cycle.
• You can view the container ID through the docker ps command.

2. Container name

• When creating a container, you can specify a name for the container.
• Container names must be unique and cannot contain special characters.
• You can view the container name through the docker ps command.

3. Image tags

• Docker images can be tagged with different versions or variants.
• When creating a container, you can specify the image tag to use.
• You can view the image tag used by the container through the docker ps --format '{{.Image}}' command.

4. Port Mapping

• Containers can expose ports to allow access from the host.
• When creating a container, you can specify port mapping to map the container port to the host port.
• You can view the port mapping of the container through the docker ps -p command.

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