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 thedocker runordocker createcommands are two common ways to add labels.

Use thedocker runcommand to start label

The following is an example of using thedocker runcommand 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--labelflag. The first label iscom.example.version=1.0, and the second label iscom.example.release-date=20200101. These two label labels were added to the Docker container namedwebapp.

Use thedocker createcommand to start label

The following is an example of using thedocker createcommand 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 thedocker createcommand to add the label label to the Docker container, and the rest is the same as using thedocker runcommand.

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 thedocker inspectcommand 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}}' 

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

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

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 labelcom.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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