设定docker容器的磁盘大小
查找到资料可以对docker容器磁盘大小进行设置，已知方法有两种，基于xfs文件系统的和devicemapper设置的，对比了一下，基于xfs方式的更适合，下面开始操作：
由于我系统是ubuntu18的。默认文件系统是ext4,所以我先把一块磁盘转为xfs：
cat /etc/fstab 查看文件系统格式
umount -v /home 取消磁盘挂载 或者 umount -v /dev/sdb
mkfs.xfs -f /dev/sdb 格式化为xfs
mount -o pquota,prjquota /dev/sdb /data/ 挂载到/data/目录
这里挂载配额类型如下:
-
根据用户(uquota/usrquota/quota)
-
根据组(gquota/grpquota) ；
-
根据目录(pquota/prjquota)(不能与grpquota同时设定)
然后参看cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
#
# / was on /dev/sdb2 during installation
UUID=8f3ddd57-8ff0-4246-9ebe-2e3fe67af716 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sdb1 during installation
UUID=6876-8F90 /boot/efi vfat umask=0077 0 1
# swap was on /dev/sdb3 during installation
UUID=7d5607fe-48f5-466f-b26b-e4b15245bde5 none swap sw 0 0
我这里有点问题，显示还是原来的/home目录，而且还是ext4，不知道为什么，有大佬知道的请教一下,用df -T命令查看是正常的
后来知道了，更改/etc/fstab才会重启自动挂载，不然只是临时挂载。
用blkid 查看挂载磁盘的UUID，然后修改/etc/fstab如下：
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
#
# / was on /dev/sdb2 during installation
UUID=8f3ddd57-8ff0-4246-9ebe-2e3fe67af716 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sdb1 during installation
UUID=6876-8F90 /boot/efi vfat umask=0077 0 1
# swap was on /dev/sdb3 during installation
UUID=7d5607fe-48f5-466f-b26b-e4b15245bde5 none swap sw 0 0
UUID=bb75e51b-643d-48b3-a79e-1f43b02c3e49 /data xfs defaults,prjquota 0 0
~# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
udev devtmpfs 131618204 0 131618204 0% /dev
tmpfs tmpfs 26333868 1412 26332456 1% /run
/dev/sda2 ext4 767830784 4758668 723994948 1% /
tmpfs tmpfs 131669324 0 131669324 0% /dev/shm
tmpfs tmpfs 5120 0 5120 0% /run/lock
tmpfs tmpfs 131669324 0 131669324 0% /sys/fs/cgroup
/dev/sda1 vfat 194348 256 194092 1% /boot/efi
tmpfs tmpfs 26333864 0 26333864 0% /run/user/0
/dev/sdb xfs 1951194260 2053256 1949141004 1% /data
mount|grep data查看挂载信息
root@ubuntu:~# mount|grep data
/dev/sdb on /data type xfs (rw,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota)
设置docker存储目录到/data/docker/有两种方式
1，把原来docker存储目录/var/lib/docker软链接到新建的/data/docker/目录下
mkdir -p /data/docker/
cd /var/lib/
mv docker docker.bak
ln -s /data/docker/ .2，停止docker服务
# systemctl stop docker.service
修改/etc/docker/daemon.json文件值，文件不存在需手动创建
# vim /etc/docker/daemon.json
新增以下信息：
{
"data-root": "/data/docker"
}
启动docker服务# systemctl start docker.service
#docker info 验证Docker Root Dir的值 是否已修改为/opt/docker/data
在启动容器时设置参数--storage-opt size=20G 就可以设置容器磁盘大小了：
docker run -idt --storage-opt size=20G ubuntu用df -T查看：
df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
udev devtmpfs 131618204 0 131618204 0% /dev
tmpfs tmpfs 26333868 1412 26332456 1% /run
/dev/sda2 ext4 767830784 4758668 723994948 1% /
tmpfs tmpfs 131669324 0 131669324 0% /dev/shm
tmpfs tmpfs 5120 0 5120 0% /run/lock
tmpfs tmpfs 131669324 0 131669324 0% /sys/fs/cgroup
/dev/sda1 vfat 194348 256 194092 1% /boot/efi
tmpfs tmpfs 26333864 0 26333864 0% /run/user/0
/dev/sdb xfs 1951194260 2053256 1949141004 1% /data
overlay overlay 20971520 8 20971512 1% /data/docker/overlay2/97a2804d81b显示已经成功了。
可以通过命令xfs_quota设置来为用户和目录分配配额，也可以通过命令来查看配额信息：
xfs_quota -x -c 'limit bsoft=10M bhard=10M dsfwe' /data xfs_quota -x -c 'report' /data/