Docker container drive does not match available hard drive space on host -


i have loaded new custom image remote redhat 7 docker host instance. when running new container, container not attempt use entire disk. following output of df -h on container:

      rootfs                9.8g  9.3g     0 100% /     /dev/mapper/docker-253:0-67515990-5700c262a29a5bb39d9747532360bf6a346853b0ab1ca6e5e988d7c8191c2573                           9.8g  9.3g     0 100% /     tmpfs                 1.9g     0  1.9g   0% /dev     shm                    64m     0   64m   0% /dev/shm     /dev/mapper/vg_root-lv_root                            49g   25g   25g  51% /etc/resolv.conf     /dev/mapper/vg_root-lv_root                            49g   25g   25g  51% /etc/hostname     /dev/mapper/vg_root-lv_root                            49g   25g   25g  51% /etc/hosts     tmpfs                 1.9g     0  1.9g   0% /proc/kcore     tmpfs                 1.9g     0  1.9g   0% /proc/timer_stats

but host system has more space:

      filesystem                   size  used avail use% mounted on     /dev/mapper/vg_root-lv_root   49g   25g   25g  51% /     devtmpfs                     1.9g     0  1.9g   0% /dev     tmpfs                        1.9g     0  1.9g   0% /dev/shm     tmpfs                        1.9g  8.5m  1.9g   1% /run     tmpfs                        1.9g     0  1.9g   0% /sys/fs/cgroup     /dev/mapper/vg_root-lv_home  9.8g   73m  9.7g   1% /home     /dev/sda1                    497m   96m  402m  20% /boot

it seems if docker assigning 9.8 gigs of /home mapping entire drive of container. wondering if there reason seeing this?

problem

i able resolve problem. issue not related volume being mounted container (ie not mounting home volume root volume on container). problem occurred because docker uses device-mapper in redhat manage file systems of it's containers. default, containers start 10g of space. in general, docker use aufs manage file systems of containers. case on debian based versions of linux, redhat uses device-mapper instead.

solution

luckily, device-mapper size configurable in docker. first, had stop service, , remove of images/containers. (note: there no coming this, backup images needed).

sudo service stop docker && sudo rm -irf /var/lib/docker

then, start docker instance manually desired size parameters:

sudo docker -d --storage-opt dm.basesize=[desired_size]

in case, increased container size 13g:

sudo docker -d --storage-opt dm.basesize=13g

then docker still running, pull/reload desired image, start container, , size should match desired size.

next, set docker systemd service file startup desired container size. required docker service start containers desired size. edited options variable in /etc/sysconfig/docker file. looks this:

options='--selinux-enabled --storage-opt dm.basesize=13g'

finally, restart docker service:

sudo service stop docker

references

[1] https://jpetazzo.github.io/2014/01/29/docker-device-mapper-resize/ - how discovered redhat uses device-mapper, , device-mapper has 10g limit.

[2] https://docs.docker.com/reference/commandline/cli/ - found storage options in dockers documentation.


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