docker out of disk space - mysql

Question

I'm hainvg trouble with docker and volume size. I'm running docker-machine with
three containers. The one giving me trouble is the MySQL container which has a
data-only container for persistance. When I try to import a mysql file, mysql
complains that the table is
full,
which really means that the disk is out of space. Looking at the system, I see
the problem, but don't know how to correct it:
_ _ ____ _ _
| |__ ___ ___ | |_|___ \ __| | ___ ___| | _____ _ __
| '_ \ / _ \ / _ \| __| __) / _` |/ _ \ / __| |/ / _ \ '__|
| |_) | (_) | (_) | |_ / __/ (_| | (_) | (__| < __/ |
|_.__/ \___/ \___/ \__|_____\__,_|\___/ \___|_|\_\___|_|
Boot2Docker version 1.8.1, build master : 7f12e95 - Thu Aug 13 03:24:56 UTC
2015
Docker version 1.8.1, build d12ea79
docker#default:~$ sudo -i
Boot2Docker version 1.8.1, build master : 7f12e95 - Thu Aug 13 03:24:56 UTC
2015
Docker version 1.8.1, build d12ea79
root#default:~# df -h
Filesystem Size Used Available Use% Mounted on
tmpfs 896.6M 112.4M 784.2M 13% /
tmpfs 498.1M 136.0K 498.0M 0% /dev/shm
/dev/sda1 2.8G 2.7G 0 100% /mnt/sda1
cgroup 498.1M 0 498.1M 0% /sys/fs/cgroup
none 462.2G 32.8G 429.5G 7% /Users
/dev/sda1 2.8G 2.7G 0 100%
/mnt/sda1/var/lib/docker/aufs
none 2.8G 2.7G 0 100%
/mnt/sda1/var/lib/docker/aufs/mnt/0a90321d2e941e31385a4c4096e
none 2.8G 2.7G 0 100%
/mnt/sda1/var/lib/docker/aufs/mnt/bca6fc0c017233ed634e7e19284
none 2.8G 2.7G 0 100%
/mnt/sda1/var/lib/docker/aufs/mnt/7e432f020ee8fc9c6a211c810e5
I created the docker-machine like this, which I thought would give me the space I need, but it has not.
docker-machine create --virtualbox-disk-size 4000 -d virtualbox default
I'm creating the mysql image like this
#!/bin/bash
echo "- checking that the image exists"
IMAGE=$(docker images | grep cp_mysql)
if [ -z "$IMAGE" ]; then
echo '- image does not exist, building'
docker build -t cp_mysql -f Dockerfile-app .
fi
echo "- checking if the mysql data volume exists"
DATA_VOL=$(docker ps -a | grep cp_mysql_data)
# if empty
if [ -z "$DATA_VOL" ]; then
echo '- data volume is empty - building'
DATA_VOL=$(docker build -t data -f Dockerfile-data_vol . | tail -n 1 | awk '{print $3}')
docker run --name cp_mysql_data $DATA_VOL
echo "- build data volume: $DATA_VOL"
else
DATA_VOL=$(echo $DATA_VOL | awk '{print $1}')
echo "- data volume is not empty - using existing volume: $DATA_VOL"
fi
echo '- check if existing cp_mysql_app exists'
APP=$(docker ps -a | grep cp_mysql_app)
if [ -z "$APP" ]; then
echo '- the app does not exist, let us create it'
docker run \
--restart=always \
--name cp_mysql_app \
--restart=always \
--volumes-from=cp_mysql_data \
-e MYSQL_USER=cp \
-e MYSQL_PASSWORD=cp \
-e MYSQL_DATABASE=cp \
-e MYSQL_ROOT_PASSWORD=root \
-d \
-p 3306:3306 cp_mysql
else
echo '- the does exist, let us just run it'
docker start cp_mysql_app
fi
Here's my docker info for that machine
docker#default:~$ docker info
Containers: 0
Images: 0
Storage Driver: aufs
Root Dir: /mnt/sda1/var/lib/docker/aufs
Backing Filesystem: tmpfs
Dirs: 0
Dirperm1 Supported: true
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 4.0.9-boot2docker
Operating System: Boot2Docker 1.8.1 (TCL 6.3); master : 7f12e95 - Thu Aug 13 03:24:56 UTC 2015
CPUs: 1
Total Memory: 996.2 MiB
Name: default
ID: XLSE:62WR:VWCR:T2Z6:FSE3:NTLV:EQRT:WLW5:NLPF:HPQH:JQGR:K4LZ
Debug mode (server): true
File Descriptors: 9
Goroutines: 16
System Time: 2015-09-08T16:31:38.029737031Z
EventsListeners: 0
Init SHA1:
Init Path: /usr/local/bin/docker
Docker Root Dir: /mnt/sda1/var/lib/docker
Labels:
provider=virtualbox
What I basically need is unbounded space for /dev/sda1, or to be able to specify a large disk size. I know this stems from my misunderstanding how docker mounts work, but I thought this thread would jump-start my research.
Thanks in advance.

Answer 1

The option --virtualbox-disk-size needs to be entered in MB (see Docker Machine Docs). You created your machine with 4GB. This gives docker 2.8GB for storing images and running containers on /dev/sda1.
The default value for disk size, which is used by docker-machine create, is 20GB (according to docs linked above). Running docker images -a will show you how much disk space is required by the images you pulled. This will give you an indication how much more space you need.
Usually 20GB is a good size to pull several different images and run some containers. So maybe you create a new machine with the default disk size and try to import the mysql file again.