CentOS7.x使用overlay2文件系统

当我查看docker详细信息时会看到如下警告：

WARNING: devicemapper: usage of loopback devices is strongly discouraged for production use.

         Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.

问题原因：

centos系统docker默认使用存储驱动是devicemapper，而这种存储驱动有两种模式loop-lvm和direct-lvm，不巧默认又使用了比较低效的loop-lvm

解决方案一

使用direct-lvm，配置方式网上很多

解决方案二：

使用overlay文件系统

因为这个方案比较简单，配置步骤如下：
1.加载overlay模块

echo "overlay" > /etc/modules-load.d/overlay.conf
modprobe overlay

lsmod | grep over

reboot

2.删除docker配置信息

rm -rf /var/lib/docker

3.修改docker启动参数

vim /usr/lib/systemd/system/docker.service

#ExecStart=/usr/bin/dockerd

ExecStart=/usr/bin/dockerd --storage-driver=overlay2 -g /opt/docker

4.重启docker

systemctl daemon-reload

systemctl restart docker

5.检测

#docker info

Containers:

Running:

Paused:

Stopped:

Images:

Server Version: 18.06.-ce

Storage Driver: overlay

Backing Filesystem: xfs

Supports d_type: true

Logging Driver: json-file

Cgroup Driver: cgroupfs

Plugins:

Volume: local

Network: bridge host macvlan null overlay

Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog

Swarm: inactive

Runtimes: runc

Default Runtime: runc

Init Binary: docker-init

containerd version: 468a545b9edcd5932818eb9de8e72413e616e86e

runc version: 69663f0bd4b60df09991c08812a60108003fa340

init version: fec3683

Security Options:

seccomp

Profile: default

Kernel Version: 3.10.-862.14..el7.x86_64

Operating System: CentOS Linux  (Core)

OSType: linux

Architecture: x86_64

CPUs:

Total Memory: .7GiB

Name: centos7-hk122

ID: 3AG5:7RUW:OZZF:ZW7Q:FRMQ:AB3M:AQWX:YIJR:H63R:JI5R:DKGS:HDUM

Docker Root Dir: /opt/docker

Debug Mode (client): false

Debug Mode (server): false

Registry: https://index.docker.io/v1/

Labels:

Experimental: false

Insecure Registries:

127.0.0.0/

Live Restore Enabled: false

不再弹出警告信息

巴特西

CentOS7.x使用overlay2文件系统

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