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knowledge-base/KB/Linux/Server/Docker Volume Migration.md

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1. Stop existing deployment
2. Create a dedicated named docker volume with `docker volume create target-vol`
3. Copy existing contents
```shell
# copy
docker run -d --rm --name temp -v target-vol:/mnt alpine tail -f /dev/null
docker cp /opt/.../. temp:/mnt
# once finished
docker stop temp
```
4. Adapt existing deployment
```shell
# dedicated volumes section
volumes:
target-vol:
external: true
# change any mount paths
volumes:
- target-vol:/....
```
5. Adapt any backup scripts which would point to the old data host directory