Increase container volume(disk) size

Docker Engine General
1

Hi,

Can someone please let me know how to increase the volume(disk) size of container ?.

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.

2

Please someone help me on this. Still I’m wondering to get my problem resolved completely

3

Read https://jpetazzo.github.io/2014/01/29/docker-device-mapper-resize/ and the more recent http://jpetazzo.github.io/assets/2015-03-03-not-so-deep-dive-into-docker-storage-drivers.html#1

4

With Centos 7 I did the following to increase the default size of the containers

Modify the docker config in /etc/sysconfig/docker-storage to add the line:
DOCKER_STORAGE_OPTIONS= - -storage-opt dm.basesize=20G
service docker stop
rm /var/lib/docker NOTE THIS DELETES ALL IMAGES etc. SO MAKE A BACKUP
service docker start
docker load < [each_save_in_backup.tar]
docker run -i -t [imagename] /bin/bash

In the bash prompt of the docker container “df -k” should show 20GB / file system size now.

5

With respect to resizing existing containers, I am not able to get the resize2fs command to succeed.

Can anyone shed additional light on this?

6

I have installed docker on Linux machine. Then i pulled an image of Red Hat Linux 7. I tried the above approach but was unable to increase the size. Does anyone have any idea regarding this?

7

I am wondering if you could give me some pointerss on a docker issue that I am facing. I am trying to increase the default fs size for containers created on OEL 7.1/docker 1.6.1 combination. I have tried setting

DOCKER_STORAGE_OPTIONS= --storage-opt dm.basesize=20G

in /etc/sysconfig/docker-storage

and also followed the instructions on the below link for reseting the sparse file size

https://jpetazzo.github.io/2014/01/29/docker-device-mapper-resize/

but even after the above, my ‘docker info’ is showing 'Data Space Total: 107.4 GB’ and new container’s default size is 10G. Any pointers?.

8

–storage-driver=devicemapper --storage-opt dm.basesize=20G

9

No such file. No such file.

10

Hi
I am using docker 17.05.0-c ubuntu 16.04
/etc/sysconfig/docker-storage this file does now exist

Does anyone know how to resize the docker volume?

11

Just create it. i did it, restarted docker and worked

12

I have had hell understanding the resize2fs.
that’s how I got it working :

First, my context is as follow :
I store my container’s volume in a file image.
Then I try to resize it.

#make a 2GB file that will be used as a filesystem
truncate -s 2G my_fs

# format file as an ext4 filesystem
mkfs.ext4 ./my_fs

# mount the filesystem in my_dir
mkdir ./my_dir
sudo mount -o loop ./my_fs  ./my_dir

my_dir can now be mounted in a docker container using the volume option

if the container is running out of space
pause the container with docker container pause 0123456789

first, find the loop device where my_dir is mounted:
lsblk

then

#add 3GB to the filesystem
truncate -s +3G 

sudo partprobe -s /dev/loop0
sudo losetup -c /dev/loop0

# check the size of the partition : 
sudo fdisk -l /dev/loop0

#resize the filesystem :
sudo resize2fs /dev/loop0

#check the new size
df -h /dev/loop0

#voila !!

now unpause the container with docker container unpause 0123456789

13

just upgrade to overlay2!

14

Can you please explain why overlay2 is the better system? I have overlay2 enabled with WSL.

Do you know if this means there is no default size limit on disk images with overlay2 storage?