dm.fs
参数dm.fs可以指定容器的rootfs的文件系统,但只支持ext4/xfs:
func NewDeviceSet(root string, doInit bool, options []string) (*DeviceSet, error) {
...
case "dm.fs":
if val != "ext4" && val != "xfs" {
return nil, fmt.Errorf("Unsupported filesystem %s\n", val)
}
devices.filesystem = va
这是为什么呢?下面是docker dm的维护者Alexander Larsson的描述:
Additionally we ensure that DISCARD support is enabled in the filesystem so that any files removed in the conttainer filters down to the loopback file making it sparse again.
参考这里
一句话,因为ext4/xfs支持DISCARD。这样,如果容器中删除了文件,空间就会马上还给Thin pool,因为Thin provisioning是支持DISCARD操作的。但是,默认情况下Thin pool是底层是稀疏文件/var/lib/docker/devicemapper/devicemapper/data,所以,只有Host的文件系统支持DISCARD,才能保证稀疏文件空间释放。
Host为ext3
# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
dbyin/tlinux1.2 latest 8297f05d459f 41 hours ago 399.6 MB
dbyin/httpd latest 93e711fab1c1 7 weeks ago 412.7 MB
centos latest 61038e6e3195 3 months ago 236.4 MB
我们可以查看稀疏文件的真正大小:
# ls -lsh /var/lib/docker/devicemapper/devicemapper/data
1.6G -rw------- 1 root root 200G Nov 12 11:52 /var/lib/docker/devicemapper/devicemapper/data
# dmsetup status
yy_pool: 0 409600 thin-pool 0 13/65536 0/3200 - rw no_discard_passdown
docker-8:1-696417-base: 0 41943040 thin 928768 41943039
docker-8:1-696417-pool: 0 419430400 thin-pool 73 633/524288 26115/3276800 - rw no_discard_passdown
我们删除一个image
# docker rmi dbyin/httpd
可以看到稀疏文件并没有变小:
# ls -lsh /var/lib/docker/devicemapper/devicemapper/data
1.6G -rw------- 1 root root 200G Nov 12 11:52 /var/lib/docker/devicemapper/devicemapper/data
# dmsetup status
docker-8:1-696417-base: 0 41943040 thin 928768 41943039
docker-8:1-696417-pool: 0 419430400 thin-pool 73 490/524288 18758/3276800 - rw no_discard_passdown
no_discard_passdown表示dm层不会将DISCARD传给底层的设备(loopback device),只删除映射关系。
Host为ext4
[root@yy3 ~]# dmsetup status
docker-253:1-8790943-pool: 0 209715200 thin-pool 339 876/524288 32432/1638400 - rw discard_passdown queue_if_no_space
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alt="" />
可以看到这里为discard_passdown,表示dm会将DISCARD传给底层设备(loopback device),queue_if_no_space表示如果thin pool没有空闲空间后,IO请求会被排队。另外,error_if_no_space表示如果thin pool没有空闲空间后,直接报错。
[root@yy3 ~]# ls -slh /var/lib/docker/devicemapper/devicemapper/data
2.5G -rw-------. 1 root root 100G Nov 12 06:14 /var/lib/docker/devicemapper/devicemapper/data
[root@yy3 ~]# docker rmi dbyin/httpd
[root@yy3 ~]# ls -slh /var/lib/docker/devicemapper/devicemapper/data
2.0G -rw-------. 1 root root 100G Nov 12 06:15 /var/lib/docker/devicemapper/devicemapper/data
可以看到删除image前后,稀疏文件大小的变化。
dm.blkdiscard
docker还提供这个参数,默认值为true,即删除image后,会调用DISCARD,真正释放HOST上空间。
func (devices *DeviceSet) deleteDevice(info *DevInfo) error {
if devices.doBlkDiscard {
// This is a workaround for the kernel not discarding block so
// on the thin pool when we remove a thinp device, so we do it
// manually
if err := devices.activateDeviceIfNeeded(info); err == nil {
if err := BlockDeviceDiscard(info.DevName()); err != nil {
log.Debugf("Error discarding block on device: %s (ignoring)", err)
}
}
}
...
}
func BlockDeviceDiscard(path string) error {
...
if err := ioctlBlkDiscard(file.Fd(), 0, size); err != nil {
return err
}
...
}
func ioctlBlkDiscard(fd uintptr, offset, length uint64) error {
var r [2]uint64
r[0] = offset
r[1] = length
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, BlkDiscard, uintptr(unsafe.Pointer(&r[0]))); err != 0 {
return err
}
return nil
}
主要参考
https://www.kernel.org/doc/Documentation/device-mapper/thin-provisioning.txt https://github.com/docker/docker/tree/master/daemon/graphdriver/devmapper