Docker identifies a container by: Container name: Unique identifier, specified at creation. Container ID: A unique identifier generated by Docker. Summary: A unique identifier generated based on image content. Tags: Key-value pairs, used to organize and identify containers. Extended Network Alias: A unique alias used to find between multiple containers. Docker Swarm service name: The name of the service collection that refers to a specific container. Docker Engine API: Allows reference to containers by name, ID, or digest.
How Docker identifies containers
Docker provides a variety of ways to identify containers, including:
1. Container name
The container name is a unique identifier, specified when creating the container. It must comply with the following rules:
- Length between 1 and 63 characters
- Only include lowercase letters, numbers, underscores and hyphens
- Can't start with numbers
- Must be unique
2. Container ID
The container ID is a long string generated by Docker. It is a unique identifier for the container, even if the container has been stopped or deleted.
3. Summary
A summary is a unique identifier used to identify the container image. It is generated based on the content of the image, including code, libraries, and dependencies.
4. Tags
Tags are key-value pairs used to organize and identify containers. They can be attached to the container image and to the container itself.
5. Extended network alias
In Docker Compose, you can specify an extended network alias for the container. These aliases can be used between multiple containers to facilitate discovery of each other.
6. Docker Swarm Service Name
In Docker Swarm, a service is a collection of container groups. A specific container can be referenced based on the service name.
7. Docker Engine API
The container can be referenced using the container name, ID, or digest through the Docker Engine API.
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