Will data be lost if you stop the docker container?

Stop the docker container and the data will not be lost. When the docker container stops and exits, it will be in the exited state. The data in it will not be lost and can be viewed through "docker ps -a"; only when the container is deleted, the data will be cleared along with the deletion of the container.

The operating environment of this tutorial: linux5.9.8 system, docker-1.13.1 version, Dell G3 computer.

Stop the docker container and the data will not be lost.

When the docker container stops and exits, it will be in the exited state, which is equivalent to shutting down the virtual machine, so there will be no data loss.

At this time, you can view it through docker ps -a, and you can also start it through docker start. Only deleting the container will clear the data.

Only after docker rm, deleting the container will clear the data.

Create a container and then delete the container. The data will also be deleted when the container is deleted.

How to delete the container without deleting the data when creating the container dockerrun-vhost_dir:containere_dirThis can solve your problem!

Extended knowledge: When the container is restarted, the log or database data generated during the running of the container will be cleared.

Solution:

Docker can permanently store data by mounting the host disk directory.

1. Execute Docker Volume when creating a container

Use the docker run command to run a Docker container, use the image ubuntu/nginx, and mount the local directory /tmp/source to the container directory /tmp /destination

docker run -itd --volume /tmp/source:/tmp/destination --name test ubuntu/nginx bash

Created a Docker container based on the ubuntu/nginx image.

The name of the specified container is test, specified by the ––name option.

Docker Volume is specified by the ––volume (can be abbreviated as -v) option. The /tmp/source directory of the host corresponds to the /tmp/destination directory in the container.

2. View Docker Volume

Use the docker inspect command to view the detailed information of the Docker container:

docker inspect --format=’{{json .Mounts}}'test | python -m json.tool[{“Destination”: “/tmp/destination”,“Mode”: “”,“Propagation”: “”,“RW”: true,“Source”: “/tmp/source”,“Type”: “bind”}]

Use the --format option to selectively view the required containers information. .Mount is the Docker Volume information of the container.

python -m json.tool can format and display the output json string.

Source represents the directory on the host, that is, /tmp/source.

Destination is the directory in the container, that is, /tmp/destination.

3. Local files can be synchronized to the container

Create a new hello.txt file in the local/tmp/source directory

touch /tmp/source/hello.txtls /tmp/source/hello.txt

hello.txt file in the container/tmp Visible in the /destination/ directory

Use the docker exec command to execute commands in the container.

docker exectest ls /tmp/destination/hello.txt

So modifications to the directory /tmp/source/ on the host machine can be synchronized to the container directory /tmp/destination/.

4. Container files can be synchronized to the host machine

Create a new world.txt file in the container/tmp/destination directory

docker exec test touch /tmp/destination/world.txtdocker exec test ls /tmp/destination/hello.txtworld.txt

The world.txt file is in the host machine/tmp Visible in the /source/ directory

ls /tmp/source/hello.txt world.txt

Recommended learning: "docker video tutorial"

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