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Docker Container - Volume and Data Recovery

DZone 's Guide to

Docker Container - Volume and Data Recovery

This code snippet helps you recover data from a crashed or exited container.

· Cloud Zone ·
Free Resource

data

Here's how to recover some of your data from stopped containers.

In this article, we will look at how to run a Docker container using volume mount and recover data from the Docker volume when a container is crashed/exited.

You may also enjoy:  How to Back Up Your Data Volumes to Docker Hub

Run the Docker Container With Volume Using the -v parameter

Syntax:

docker run -dit --name <containerName> -v <volumeName>:<directoryName> -p 8080:8080 --env-file <env-file.env> <dockerImageName>


Sample command volume for /opt directory:

docker run -dit --name testcontainer -v opt-vol:/opt -p 8080:8080 --env-file properties.env <dockerImageName>



 -dit runs the container in detached mode. For interactive mode use -it.
 -p helps to expose specified ports. If port is already in use, try with other port of host to connect.

List the active Docker containers

docker ps


List the active/exited Docker containers

docker ps -a


If the above container "testcontainer" is exited, then run another container (testcontainer1) with a new volume "opt-vol-1" for /opt directory.

docker run -dit --name testcontainer1 -v opt-vol-1:/opt -p 8080:8080 --env-file properties.env <dockerImageName>


Use the docker cp command to copy the data from existing container volume "opt-vol" to currrent container /opt   once the new container is up.

docker cp /var/lib/docker/volumes/opt-vol/_data/confighome/config <new-containerID-testcontainer1>:/opt/confighome/


List the Docker volume:

docker volume ls


Inspect Docker volume:

docker volume inspect <volumeName>

docker volume inspect opt-vol

Note: Fill the values in your environment in angle brackets.

Further Reading


Demystifying the Data Volume: Storage in Docker


Docker Images and Containers

Topics:
docker ,docker container ,data recovery ,storage ,volume ,cloud

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