Change the default images storage location for Docker

The image of Docker and some data are in the/var/lib/docker directory, it occupies the Linux system partition, that is, the following/dev/vda1, when there are multiple mirrors,/dev/vda1 space may be insufficient, We can attach Docker data to a data disk, for example:/dev/vdb directory.

filesystem Type size used Avail use% mounted on
/dev/vda1 xfs 20G 3.8G 16G 20%/
tmpfs tmpfs 921M 0 921M 0%/dev/shm
tmpfs Tmpfs 921M 43M 878M 5%/run
tmpfs Tmpfs 921M 0 921M 0%/sys/fs/cgroup
/dev/vdb XFS 100G 11G 90G 11%/data

The main steps are as follows:
(1) First, back up the Fstab file
sudo cp/etc/fstab/etc/fstab.$ (date +%y-%m-%d)

(2) Stop Docker and sync/var/lib/docker to new location with Rsync.

If rsync is not installed, install using Yum-y intall rsync, stop Docker, service Docker stop, create a directory to mount in the data partition, Mkdir/data/docker sync with rsync tool

rsync-axs/var/lib/docker/. /data/docker/, this may take a long time, depending on the size of the/var/lib/docker,

(3) Modify Fstab

Add the following line to the Fstab in the file and mount the new location to the/var/lib/docker

/data/docker/var/lib/docker None bind 0 0

Within the file, as follows:

[Email protected]06 docker]# Cat/etc/fstab

#
#/etc/fstab
# Created by Anaconda on Thu Jul 31 07:50:13 2014
#
# Accessible filesystems, by reference, is maintained under '/dev/disk '
# See mans Pages Fstab (5), Findfs (8), mount (8) and/or Blkid (8) for more info
#
/DEV/VDA1/XFS Errors=remount-ro 0 1
/swapfile None swap defaults 0 0
/dev/vdb/data XFS defaults,noatime 0 0
/data/docker/var/lib/docker None bind 0 0

(4) Re-mount

Mount–a

(5) Use the following command to check

df/var/lib/docker/
Filesystem 1k-blocks used Available use% mounted on
/dev/vdb 104806400 47204 104759196 1%/var/lib/docker

< EM id= "__mcedel" > (6) enter contain Er view our space

< EM id= "__mcedel" >bash-4.1# df-lht
Filesystem Type Size Used Avail use% mounted on
rootfs rootfs 9.8G 1.4G 7.9G 15%/
Tmpfs tmpfs 921M 0 921M 0%/dev
shm tmpfs 64M 0 64M 0%/dev/shm
/dev/vdb xfs 100G 2.1G 98G 3%/etc/resolv.conf
/dev/vdb xfs 100G 2.1G 98G 3%/etc/hostname
/dev/vdb XFS 100G 2.1G 98G 3%/etc/hosts
Tmpfs tmpfs 921M 0 921M 0%/run/secrets
Tmpfs tmpfs 921M 0 921M 0%/proc/kcore /em>

Before you change the/var/lib/docker path:

bash-4.1# DF-LHT

< EM id= "__mcedel" > filesystem Type Size Used Avail use% mounted on

Rootfs rootfs 9.8G 1.4G 7.9G 15%/

Tmpfs tmpfs 921M 0 921M 0%/dev

< EM id= "__mcedel" > < EM id= "__mcedel" >shm tmpfs 64M 0 64M 0%/dev/shm

< EM id= "__mcedel" >/dev/vda1 xfs 20G 13G 6.9G 66%/etc/resolv.conf

< EM id= "__mcedel" > /dev/vda1 xfs 20G 13G 6.9G 66 %/etc/hostname

< EM id= "__mcedel" >/dev/vda1 xfs 20G 13G 6.9G 66%/etc/hosts

< EM id= "__mcedel" > < EM id= "__mcedel" >tmpfs tmpfs 921M 0 921M 0%/run/secrets

Tmpfs tmpfs 921M 0 921M 0%/proc/kcore

Partition size information in the host:

< EM id= "__mcedel" >[[email protected] ~]# df-lht
Filesystem Type Size used Avail use% mounted on

/DEV/VDA1 xfs 20G 13G 6.9G 65%/

Devtmpfs Devtmpfs 916M 0 916M 0%/dev

< EM id= "__mcedel" > tmpfs tmpfs 921M 0 921M 0%/ Dev/shm

< EM id= "__mcedel" >tmpfs tmpfs 921M 89M 832M 10%/run

< EM id= "__mcedel" > < EM id= "__mcedel" >tmpfs tmpfs 921M 0 921M 0%/sys/fs/cgroup

/dev/vdb xfs 100G 33M 100G 1%/data

Change the default images storage location for Docker