How to exit docker container without closing the container

Two methods for docker to exit the container without closing the container: 1. Press the "Ctrl P Q" button to exit the container, and you can exit normally without closing the container; 2. After exiting, you can use the "docker restart" command to restart the container. After entering the container with the attach command, restart httpd and radosgw, and use wget to verify whether radosgw is successfully restarted.

The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.

How docker exit the container without closing the container

Method 1: If you want to exit normally without closing the container, please press Ctrl P Q to exit the container

The following example exits the container without closing it

Method 2: If you use exit to exit, the container will be closed after exiting. You can use the following process to recover

• Use the docker restart command to restart the container

• Use the docker attach command to enter the container

• Restart httpd (service httpd restart) and radosgw (/etc/init.d/ceph-radosgw restart), and use wget to verify whether radosgw is restarted successfully

Expand knowledge

In fact, we can configure it when starting the container and add the -d parameter to start the container. Of course, this command is only limited to starting new containers. It is not possible to start closed containers. .

docker run -d: Run the container in the background and return the container ID

The following example uses docker -d to start the container and exit

Here you may find that the container is still dead after using the -d command to exit. A hands-on friend may find that just using docker run -d to start the container is also dead.

Here In fact, what you need to understand is the running mechanism of the container. The Docker container runs in the background and must have a foreground process. Here we let the container have a foreground program to run, so that the container can survive after -d startup

I use nohup to run a process in the background that pings Baidu every 1000 seconds. In addition, you can also use "while true; do echo hello world; sleep 1; done" to output hello world infinitely.

In addition, even if there is a process running in the background, if you enter the container and enter exit to exit, the running of the container will still be terminated, please bear in mind.

Recommended learning: "docker video tutorial"

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