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This article mainly explains "what is the method of creating, starting, and stopping Docker container". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the method of creating, starting, and stopping Docker container".

1. A container is an application or a group of applications that run independently, and their operating environment. Container is an important concept in Docker.

2. There are three ways to start the docker container

a. Interactive mode, create a new container based on the image and launch

Use the docker run command to start the container, and the standard operations for docker to run in the background include

Check whether the specified image exists locally. If it does not exist, download it from the public repository.

Create and start a container using an image

Assign a file system and mount a readable and writable layer outside the read-only mirror layer

To bridge a virtual interface container from the bridge interface configured by the host host

Assign an ip address to the container from the address pool

Execute a user-specified application

The container is terminated after execution

B. in a short-lived way, start and run a terminated container directly.

You can use the docker start command to get a terminated container up and running directly.

[root@rocketmq-nameserver4 ~] # docker run my/python:v1 / bin/echo hello test

Hello test

After the command is executed, the console prints "hello test" and the container terminates, but it does not disappear.

You can use "docker ps-n 5" to take a look at the first five new container. The first one is the container that has just been executed. You can execute it again: docker start container_id

But this time the console does not see "hello test", only see ID, use the logs command to see: docker logs container_id.

You can see two "hello test" because the container has been run twice.

C, daemon mode, guardian operation

That is to say, let the software run as a long-term service, this is SAAS!

For example, we start the centos background container and print the calendar for the day every other second.

$docker run-d centos / bin/sh-c "while true;do echo hello docker;sleep 1 done"

After startup, we use docker ps-n 5 to view the container information

To view the output in the launched centos container, you can use the following ways:

$docker logs $CONTAINER_ID # # View its output outside container

$docker attach $CONTAINER_ID # # connect to the container for real-time viewing:

3. Termination container

Use docker stop $CONTAINER_ID to terminate a running container. And you can use docker ps-a to see the container that terminates the state.

The container that terminates the state can be restarted using docker start.

Use the docker restart command to restart a container.

Thank you for reading, the above is "what is the method of creating, starting, and stopping Docker container". After the study of this article, I believe you have a deeper understanding of what the method of creating, starting, and stopping Docker container is, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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