Docker使用LVM存储
默认情况下，Centos下docker使用的为loop模式存储，这个模式只能在测试环境中使用。警告信息如下：
WARNING: Usage of loopback devices is strongly discouraged for production use. Either use `--storage-opt dm.thinpooldev` or use `--storage-opt dm.no_warn_on_loop_devices=true` to suppress this warning.
[*] 添加用于docker存储的硬盘
[*] 创建PV
# pvcreate /dev/sdb
[*] 创建VG
# vgcreate datavg /dev/sdb
[*] 创建LV
# lvcreate -L 90G -n data datavg
# lvcreate -L 5G -n metadata datavg
[*] 修改docker启动参数
# more /lib/systemd/system/docker.service
ExecStart=/usr/bin/docker daemon -g=/docker --insecure-registry repo.fctty.com -H unix:///var/run/docker.sock -H tcp://0.0.0.0:2375 --label label_name=fcrepo --iptables=false --storage-driver=devicemapper --storage-opt dm.datadev=/dev/datavg/data --storage-opt dm.metadatadev=/dev/datavg/metadata
[*] 启动docker
# systemctl daemon-reload
# systemctl start docker
[*] 查看更改后的存储
# docker info
Server Version: 1.11.1
Storage Driver: devicemapper
Pool Name: docker-253:0-381715-pool
Pool Blocksize: 65.54 kB
Base Device Size: 10.74 GB
Backing Filesystem: xfs
Data file: /dev/datavg/data
Metadata file: /dev/datavg/metadata
Data Space Used: 14.09 MB
Data Space Total: 96.64 GB
Data Space Available: 96.62 GB
至此，docker已成功使用LVM磁盘卷了，不再担心存储爆了。
官方文档参考：https://docs.docker.com/engine/userguide/storagedriver/device-mapper-driver/
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