升级centos7的内核为支持aufs的内核，并重新安装docker，使它的storage driver为aufs
升级内核
- 下载aufs的rpm安装包 kernel-ml-aufs.tgz
- 解压安装rpm -ivh 安装即可
- centos7修改 /etc/default/grub 中GRUB_DEFAULT=saved 为GRUB_DEFAULT=0，表示之后启动安装第一个内核启动
- grub2-mkconfig -o /boot/grub2/grub.cfg 使上面的修改生效
- reboot 系统
- uanme -r 查看结果3.10.5-3.el6.x86_64
- grep aufs /proc/filesystems 查看结果nodev aufs
升级内核成功
此时如果之前没有安装过docker，直接安装docker即可，如果之前已经安装过docker
docker info
删除docker
- yum list installed | grep docker
- yum remove 相应的包
- rm -rf /var/lib/docker
docker info
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0
Server Version: 1.12.6
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Backing Filesystem: xfs
Dirs: 0
Dirperm1 Supported: false
Logging Driver: journald
Cgroup Driver: systemd
Plugins:
Volume: local
Network: overlay bridge null host
Swarm: inactive
Runtimes: docker-runc runc
Default Runtime: docker-runc
Security Options: seccomp
Kernel Version: 3.10.5-3.el6.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64