When you create docker machine, you can nominate the memory size: docker-machine create -d virtualbox -virtualbox-memory 4096 default. Docker-machine stop VBoxManage modifyvm default -cpus 2 VBoxManage modifyvm default -memory 4096 docker-machine start. Answered Jul 26, 2018 by Kalgi. Apache Flink® is a powerful open-source distributed stream and batch processing framework. Docker Desktop provides binfmtmisc multi-architecture support, which means you can run containers for different Linux architectures such as arm, mips, ppc64le, and even s390x. This does not require any special configuration in the container itself as it uses qemu-static from the Docker for Mac VM. Once I deployed the container, I just look at the disk space allocated to docker. Just 10GB has allocated to this. Is there any option to set the disk size to 100GB?. I have 1TB Hard disk size root@fa10q3907qab # df -h Filesystem Size Used Avail Use% Mounted on rootfs 9.8G 878M 8.4G 10% / Thanks.
Sometime back I wrote a feature for docker to allow expanding Base device size on daemon restart. This feature has been included in Docker 1.10, so you can try it out now.
Before we jump further into this article, I would like to point out that this feature is only available for devicemapper storage and does not apply to other storage drivers like overlay, btrfs, aufs, etc.
Base Device Size
If you do
docker info
, you will see base device size in the output.So what is this base device size? The first time docker is started, it sets up a base device with a default size of 10 GB. All future images and containers would be a snapshot of this base device.
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Base size is the maximum size that a container/image can grow to. By default we limit containers to 10G. In Devicemapper, new container/images take zero size and grow up to the maximum size. Changing the base size will not actually change the physical usage of containers unless they grow larger than 10 GB.
Many users add Volumes instead of growing the base device, which is why they haven’t used this feature yet. However, there are times when Volumes might not be suitable for your needs.
I will give you an example of growing it. For the purpose of this article, let’s use Fedora as an example image.
Let’s start a container on this Fedora image:
As we can see in the above container, the device size of this container is 10 GB. We can also check this using the
docker inspect
command with some filters:As we can see the container device size in docker inspect output is also 10 GB (10737418240 / 10243 ).
![High High](/uploads/1/1/9/3/119357346/924311783.jpg)
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Increasing the Base Device Size on daemon Restart
What if I want my container rootfs (device) size to be 20 GB? I cannot do that since the base device size is set to 10 GB. With this feature we can expand the Base device size on daemon restart to 20 GB. Note I used the word “expand” and not “change”, which means we cannot set the base device size to 5 GB (less than the existing base device size: 10GB) on daemon restart.
We have changed the base device size to 20 GB on daemon restart. Let’s double check it using the
docker info
command:As we can see, the base device has been expanded. Now let’s start a Fedora container and see if we get the new container rootfs size:
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Checking it using
docker inspect
:Why is the container still showing 10GB of container rootfs size? Shouldn’t we be getting 20 GB? This is expected behavior. Since our new container is based on our old Fedora image, which is based on the old base device size, the new container would not get a 20-GB device size unless we update the image.
So let’s remove the existing Fedora image and update it from the registry.
And start a container on this new Fedora image:
As we can see, the container rootfs size is now 20GB. This feature would allow us to expand the base device size on daemon restart, which means all future images and containers (based on those new images) will be of new size.
However, there are certain limitations to this solution.
Limitations
- All new containers would not have the increased rootfs size. As we saw above even after restarting the daemon with the new base device size (–storage-opt dm.basesize=20G), we would still need to update all the existing images in order for new containers to reap benefits of this new size.
- With this approach the heaviest application (container) would dictate the size for the rest of the containers, e.g., if I want to have 100 containers on my infrastructure and one of them is a data intensive application requiring 100 GB of space, I would have to set the base device size (dm.basesize=100G) to 100 GB. Even though there are 99 other containers that only needed 200 MB of space each.
Since these limitations are fairly serious, I have developed a better solution where we can grow the container rootfs at docker create/run time. I am trying to get that feature merged upstream and make it available in docker 1.12.
Please comment on the pull request if you are interested. Once the PR is merged upstream, I will write a blog post about it.
Question: How to find the running docker storage device when docker is using the device-mapper storage driver and then check the size of it?
1. Please run the “docker info” command to display docker system-wide information which contains the docker storage info.
2. We can also use “lsblk” and “blkid” to check the layout and UUID of the docker storage.
3. We can find the actual loopback-mounted sparse files on the file system.
4. We can also use “losetup” to query the mapping of the loop devices for docker storage.
Hence, from the above output, we can find that the docker storage is running in loop mode. This is indicated by the fact that the data loop file and a metadata loop file are on files under /var/lib/docker/devicemapper. These are loopback-mounted sparse files. Therefore the size of these displayed sparse files is much bigger than their actual size on the disk.