How to use docker to start label

Docker startup label is a way to label Docker containers. Custom labels can be assigned to containers for easy management and identification. This article will introduce how to start labels in Docker and use them.

What is docker startup label?

Docker startup label is a customizable marking mechanism that can be used in Docker containers in the form of labels and key-value pairs. This way, you can assign custom labels to Docker containers, which can be used for container management, grouping, and visualization. The label mechanism can be used to assign more information to containers in Docker, such as version, status, and container usage.

How to start label in Docker?

It is very simple to start label using Docker. You only need to add one or more labels when starting the Docker container. Using the docker run or docker create commands are two common ways to add labels.

Use the docker run command to start label

The following is an example of using the docker run command to add a label label to a Docker container:

docker run -d --name=webapp \
-p 8080:8080 \
--label com.example.version=1.0 \
--label com.example.release-date=20200101 \
nginx:latest

In the example, two label labels are added using the --label flag. The first label is com.example.version=1.0, and the second label is com.example.release-date=20200101. These two label labels were added to the Docker container named webapp.

Use the docker create command to start label

The following is an example of using the docker create command to add a label label to a Docker container:

docker create --name=webapp \
-p 8080:8080 \
--label com.example.version=1.0 \
--label com.example.release-date=20200101 \
nginx:latest

In the example, just use the docker create command to add the label label to the Docker container, and the rest is the same as using the docker run command.

How to use docker to start label?

Docker startup labels have been successfully added to the Docker container. Now you need to know how to use these labels. Starting from Docker version 1.6, you can use the docker inspect command to view the label of the container. Here are a few examples:

Output all labels of the Docker container

docker inspect --format='{{json .Config.Labels}}' <container_name></container_name>

Output the specified Docker container label (such as the "com.example.version" label)

docker inspect --format='{{index .Config.Labels "com.example.version"}}' <container_name></container_name>

The output is All Docker containers with the specified label

docker ps --filter "label=com.example.version=1.0"

The above command can query the list of all Docker containers containing the label label com.example.version=1.0.

Conclusion

Docker startup label is an important feature of the Docker container, which can easily assign labels and key-value pairs to the Docker container. Using the label mechanism, you can assign more metadata to Docker containers. Please label your containers when managing Docker containers for better management and maintenance.

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