Resize disk usage of a Docker container - docker

Question

Every Docker container will be configured with 10 GB disk space, which is the default configuration of devicemapper in CentOS. So how can I configure every container newly created with more than 10 GB disk space in default? (The host server is installed with CentOS 6 and Docker 1.7.1)

Answer 1

Yes you can. Use the dm.basesize attribute when starting the Docker daemon. For example:
docker daemon --storage-opt dm.basesize=50G ...
More info can be found in the official docs.

Answer 2

(optional) If you have already downloaded any image via docker pull you need to clean them first - otherwise they won't be resized
docker rmi your_image_name
Edit the storage config
vi /etc/sysconfig/docker-storage
There should be something like DOCKER_STORAGE_OPTIONS="...", change it to DOCKER_STORAGE_OPTIONS="... --storage-opt dm.basesize=100G"
Restart the docker deamon
service docker restart
Pull the image
docker pull your_image_name
(optional) verification
docker run -i -t your_image_name /bin/bash
df -h
I was struggling with this a lot until I found out this link http://www.projectatomic.io/blog/2016/03/daemon_option_basedevicesize/
turns out you have to remove/pull image after enlarging the basesize.

Answer 3

For those who use Mac, here's an easier solution:
Click "Preference" from Docker icon in the status bar:
Then navigate to "Disk" tab, adjust the disk image size with the slider. Docker will take a moment to restart.
That's it.

Answer 4

Above answers properly suggest we have to edit dm.basesize attribute of devicemapper,
but proposed solutions are out of date or simply does not work in my case.
First make sure your storage dirver is a devicemapper with:
docker info | grep "Storage Driver"
you can also check current max-size of container with: (default 10 gb)
docker info | grep "Base Device Size"
From devicemapper documentation
1) edit dm.basesize in etc/docker/daemon.json file, or create new one if does not exist
{
"storage-opts": [
"dm.basesize=30G"
]
}
2) restart docker deamon
sudo systemctl stop docker
sudo systemctl start docker
3) run again command below to check if size changed
docker info | grep "Base Device Size"
4) Its important to update current images so change is applied