How to restart docker exit

When using Docker, we often encounter situations where some containers run abnormally or exit. At this time, we need to restart the container to restore normal operation. This article will introduce how to restart a container in Docker.

Docker is an open source application container engine that allows developers to easily build, publish and run distributed applications. Using Docker allows you to more efficiently manage applications and the environments they depend on, while also providing greater portability and scalability.

In Docker, container is the most basic running unit. It is a lightweight virtualization technology that can run multiple isolated containers on the same physical machine. Each container has its own Independent operating system, file system and network interface.

When a container runs abnormally or exits, we need to restart it to restore normal operation. Here are two different ways to restart a container.

Method 1: Use the docker restart command

The docker restart command can restart a running container. The syntax of this command is as follows:

docker restart [OPTIONS] CONTAINER [CONTAINER...]

Among them, OPTIONS is an optional parameter, and CONTAINER is the name or ID of one or more containers that need to be restarted.

Here is an example:

docker restart mycontainer

In the above command, we restarted the container named mycontainer. If the container is running, the restart command will take effect immediately.

Method 2: Use docker start and docker stop commands

If we want to stop a container first and then start it, we can use docker stop and docker start commands. The syntax of these two commands is as follows:

docker stop [OPTIONS] CONTAINER [CONTAINER...]
docker start [OPTIONS] CONTAINER [CONTAINER...]

Among them, OPTIONS is an optional parameter, and CONTAINER is the name or ID of one or more containers that need to be stopped or started.

Here is an example:

docker stop mycontainer
docker start mycontainer

In the above example, we first stopped the container named mycontainer using the docker stop command and then restarted the container using the docker start command.

It should be noted that using the docker stop command to stop the container will cause the container's status to change to Exited. If you directly use the docker start command to start the container, the container may not be started. At this time we need to use the docker run command to re-create the container, or use the --attach option of the docker start command to attach to the standard output and error output of the container:

docker start --attach mycontainer

Summary

In In Docker, we can use the docker restart command or the docker stop and docker start commands to restart the container. No matter which method is used, we should pay attention to the status changes of the container to ensure that the container can start normally. In addition, we can use the docker logs command to view the container's logs to help us find out why the container is running abnormally.

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