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This article focuses on "how to create, start and stop Docker containers". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to create, start and stop Docker containers.

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

For example, we can start a container and print out the current calendar.

[root@rocketmq-nameserver4 ~] # docker run my/python:v1 cal # # my/python:v1 is the image name and tag

We can also start a bash interactive terminal by specifying parameters.

[root@rocketmq-nameserver4 ~] # docker run-it my/python:v1 / bin/bash

The parameter-t tells docker to assign a pseudo terminal and bind it to the standard input of the container, and-I keeps the standard input of the container open.

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

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

two。 Create and start a container using an image

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

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

5. Assign an ip address to the container from the address pool

6. Execute a user-specified application

7. The container is terminated after execution

My/sinatra:v2 is based on the modified image of training/sinatra image, and training/sinatra is the image on the public repository.

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 will print "hello test", and the container will be terminated, but it does not disappear. You can use "docker ps-n 5" to take a look at the first five container. The first one is the container that has just been executed, and 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.

At this point, I believe that you have a deeper understanding of "how to create, start, and stop Docker containers". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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