Move docker bind-mount to volume

Question

Actually, I run my containers like this, for example :

docker run -v /nexus-data:/nexus-data sonatype/nexus3
              ^

After reading the documentation, I discover volumes that are completely managed by docker. For some reasons, I want to change the way to run my containers, to do something like this :

docker run -v nexus-data:/nexus-data sonatype/nexus3
              ^

I want to transfer my existing bind-mount to volumes.

But I don't want to lose the data into /nexus-data folder, is there a possibility to transfer this folder, to the new volume, whitout restart everything ? Because I've also Jenkins and Sonar containers for example, I just want to change the way to have persistent data. The is a proper way to do this ?

Answer 1

You can try out following steps so that you will not loose your current nexus-data.

#>docker run -v nexus-data:/nexus-data sonatype/nexus3
#>docker copy /nexus-data/. <container-name-or-id>:/nexus-data/
#>docker stop <container-name-or-id>
#>docker start <container-name-or-id>

docker copy will copy data from your host-machine's /nexus-data folder to container's FS /nexus-data folder which is your mounted volume.

Let me know if you face any issue while performing following steps.