docker_volumes

# To Check storage driver in your system
$ docker info |grep Storage
 Storage Driver: overlay2

# To check docker’s local storage area
$ docker info |grep "Docker Root Dir"
 Docker Root Dir: /var/lib/docker
 
 # To Change the storage driver
 sudo systemctl stop docker
 
 $ sudo cat daemon.json
{
  "storage-driver": "devicemapper"
}

Start the docker daemon

sudo systemctl start docker

NOTE: Changing storage driver wiped out all the image

# To create a volume
$ docker volume create mytestvol

# To verify it
$ docker volume ls

# Run a container using this Volume

$ docker container run -dt --name mytestvol -v mytestvol:/etc centos bash

# Check the location of Volume in Host system
$ docker volume inspect mytestvol |grep Mountpoint

# Creating data container
docker create -v myvolshare --name myvolshare  centos bash

# Share it with other container

docker container run -dt --volumes-from myvolshare --name mytest centos bash

# To delete a volume
$ docker volume rm mytestvol


# Bind mount the volume
docker run -dt --name mybindmount -v ~/index:/usr/share/nginx/html -p 8080:80 nginx

# Different way to specify bind mount
docker container run -dt --name mybindmount01 --mount type=bind,source=/home/cloud_user/index,target=/usr/share/nginx/html -p 8081:80 nginx

# Read only bind mount
docker container run -dt --name mybindmount03 --mount type=bind,source=/home/cloud_user/index,target=/usr/share/nginx/html,readonly -p 8082:80 nginx

# Remove all unused local volumes
$ docker volume prune


# Create the volume using Dockerfile
FROM busybox
RUN mkdir /mytestvol
RUN echo "testing volume" >> /mytestvol/test.txt
VOLUME /mytestvol

# Build the image
docker build -t mytestvol .

# Run the container using this Volume
docker container run -dt --name mytestvol 95aed0e870d1 sh

# Verify the volume
docker volume ls

# Assign a name to your volume
docker container run -dt --name mytestvol01 -v testvol:/mytestvol 95aed0e870d1 sh

# Verify the volume
docker volume ls