Run a docker container with bigger storage

By default, the Docker command-line utility docker runs containers with 10G storage, which in most cases is enough, but if the user wants to just run a specific container with bigger storage there is an option for the docker command:

docker run --storage-opt size=50G

The option size=50G will set the docker container storage for the current only run command!

main menu
Root file system with 50G size.

Run a Ubuntu 22.04 Docker container with 50G root storage:

root@srv ~ # docker run --storage-opt size=50G -it ubuntu:22.04 bash
Unable to find image 'ubuntu:22.04' locally
22.04: Pulling from library/ubuntu
e96e057aae67: Pull complete 
Digest: sha256:4b1d0c4a2d2aaf63b37111f34eb9fa89fa1bf53dd6e4ca954d47caebca4005c2
Status: Downloaded newer image for ubuntu:22.04
root@4caab8c61157:/# df -h
Filesystem                                                                                          Size  Used Avail Use% Mounted on
/dev/mapper/docker-253:0-39459726-2f2d655687e5bd39620a2a083960ac969d8163b806152765a1fc166f0a82d3d9   50G  170M   50G   1% /
tmpfs                                                                                                64M     0   64M   0% /dev
tmpfs                                                                                               7.8G     0  7.8G   0% /sys/fs/cgroup
shm                                                                                                  64M     0   64M   0% /dev/shm
/dev/mapper/map-99f55d81-4132-42d4-9515-33d8cc11d3e2                                                3.6T  1.5T  2.2T  40% /etc/hosts
tmpfs                                                                                               7.8G     0  7.8G   0% /proc/asound
tmpfs                                                                                               7.8G     0  7.8G   0% /proc/acpi
tmpfs                                                                                               7.8G     0  7.8G   0% /proc/scsi

It’s worth mentioning this option “–storage-opt size=50G” is different from the “–storage-opt dm.basesize=50G“, the first one is used as a command argument to the docker command-line utility. The second one is used with the dockerd daemon to change the default Docker behavior from 10G to 50G storage. Note, either option cannot change the storage size of the already started container.

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