![]() Notice that this is a little like establishing an SSH session or using SCP. For example: $ docker volume create -driver vieux/sshfs -o -o password=mypassword test-vol We can then create a volume using this volume driver. For this to work, you first have to install the volume driver onto each docker host that needs access to the volume: $ docker plugin install -grant-all-permissions vieux/sshfs One example of which is the vieux/sshfs driver (you can also use an NFS driver) – this allows a docker host to access a volume remotely. To use a shared docker volume we need to use a different volume driver. ![]() A different way to do this is to use a shared volume. Note that using this method, a volume will be created on each docker swarm node that runs a replica of the service. When creating the service you can use the –mount flag: $ docker service create -d -replicas=4 -name nginx-service -mount source=test-vol,target=/app nginx:latest You can also use volumes with Docker services. If we used a volume name that didn’t already exist then a new volume would have been created when the container started. Note: This container was started using a volume that already existed. "Source": "/var/lib/docker/volumes/test-vol/_data", ![]() Running docker inspect against the nginxtest container, the output will show the mounts: "Mounts": [ 2 root root 25 Jul 7 09:11 dataĪnd within it we can see testfile.txt which we created on the docker host earlier: cd ls Now, in the bash shell of the container, we can see the data directory: drwxr-xr-x. With this command, I have started a docker container using the nginx image and attached the test-vol container created earlier, which is mounted to /data. $ docker run -it -name nginxtest -v test-vol:/data nginx:latest /bin/bash You can read about both here, but I will be using the -v option. A volume can be added to a container by using either the -v or the –mount flag. When starting a docker container you can either use an existing volume, or you can have a volume be created when the container is created. $ touch testfile.txt Using Volumes with Docker Containers We can go to this location and create a file: $ cd /var/lib/docker/volumes/test-vol/_data The mountpoint attribute shows the location of the volume and the data within. We can get more information on a docker volume by using the docker inspect command: $ docker inspect test-vol The output will show the name of the volume, and the driver used (more about that later). The docker volumes on the host can be listed with the docker volume list command: $ docker volume list ![]() For example: $ docker volume create test-vol List Docker Volumes and Inspect Docker Volumes How to Create a Docker VolumeĪ docker volume can be created using the docker volume create command. With bind mounts, you can mount any area on the host meaning that the docker host and docker container could both modify the files within. Volumes are usually the best option as non-docker processes shouldn’t be interacting with the data in /var/lib/docker/volumes. You could even mount /etc – but not a good idea! If you did so the container would be able to modify files in that location! Bind Mounts – These allow storage to be mounted from anywhere on the host system.On my Centos system this is /var/lib/docker/volumes. Docker Volumes – These are stored on the host file system that docker manages.There are two ways to save/persist data from docker containers by mounting storage from the docker host system. ![]() Examples of data you likely want to keep include: There a many reasons why you would want to persist container data. Options for Persisting Data in Docker Containers
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