How do I make docker data persistent using volumes?
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To make docker persistent, docker containers use volumes.
This command will create a container with a volume, and touch a file in that volume.
$ docker run --name training -v /trainingdocs alpine touch /trainingdocs/class1
You can inspect the container using the inspect command: first get the container id.
$ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 23f00b24aa59 alpine "touch /trainingdo..." 5 seconds ago Exited (0) 5 seconds ago training
Inspect the container. List just the Mounts section.
"Mounts": [ { "Type": "volume", "Name": "af5f9fd9cb153f5e9554aaba4e7428283d42fc2307ae2df84b387739a91ee09d", "Source": "/var/lib/docker/volumes/af5f9fd9cb153f5e9554aaba4e7428283d42fc2307ae2df84b387739a91ee09d/_data", "Destination": "/trainingdocs", "Driver": "local", "Mode": "", "RW": true, "Propagation": "" } ],
List your file in the volume.
sudo ls /var/lib/docker/volumes/af5f9fd9cb153f5e9554aaba4e7428283d42fc2307ae2df84b387739a91ee09d/_data class1
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