docker devicemapper 扩容
查看当前大小: 100G
$ ls -lh /var/lib/docker/devicemapper/devicemapper/ total 82G -rw------- 1 root root 100G Dec 4 14:06 data -rw------- 1 root root 2.0G Dec 4 14:05 metadata
扩容到200G
$ truncate -s 200G /var/lib/docker/devicemapper/devicemapper/data
查看扩容后磁盘文件大小(内存中大小暂未改变)
$ ls -lh /var/lib/docker/devicemapper/devicemapper/ total 82G -rw------- 1 root root 200G Dec 4 14:07 data -rw------- 1 root root 2.0G Dec 4 14:07 metadata reload
从命令行调用区块设备控制程序
$ echo $[ $(sudo blockdev --getsize64 /dev/loop0) / 1024 / 1024 / 1024 ] 100
losetup用来将loopdevice与档案或blockdevice联结、分离.以及查询loopdevice目前的状况,如只给定loop_device的参数.则秀出loopdevice目前的状况
$ losetup -c /dev/loop0 $ echo $[ $(sudo blockdev --getsize64 /dev/loop0) / 1024 / 1024 / 1024 ] 200 Reload the devicemapper thin pool $ dmsetup status | grep ' thin-pool ' | awk -F ': ' {'print $1'} docker-252:0-5637144768-pool $ dmsetup table docker-252:0-5637144768-pool 0 209715200 thin-pool 7:1 7:0 128 32768 1 skip_block_zeroing $ dmsetup suspend docker-252:0-5637144768-pool $ dmsetup reload docker-252:0-5637144768-pool --table '0 419430400 thin-pool 7:1 7:0 128 32768 1 skip_block_zeroing' $ dmsetup resume docker-252:0-5637144768-pool
扩容完成查看效果(200G)
$ docker info Containers: 21 Running: 20 Paused: 0 Stopped: 1 Images: 118 Server Version: 17.05.0-ce Storage Driver: devicemapper Pool Name: docker-252:0-5637144768-pool Pool Blocksize: 65.54kB Base Device Size: 64.42GB Backing Filesystem: xfs Data file: /dev/loop0 Metadata file: /dev/loop1 Data Space Used: 87.43GB Data Space Total: 214.7GB Data Space Available: 127.3GB Metadata Space Used: 99.05MB Metadata Space Total: 2.147GB Metadata Space Available: 2.048GB Thin Pool Minimum Free Space: 21.47GB
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