本次测试的服务器2台，服务器#1(centos7)最为docker容器所在的host，服务器#2(centos6)提供NFS服务
1. #2上配置NFS服务
(1) 安装nfs软件包
yum -y install nfs-utils portmap
(2) 配置 /etc/exports
/home/nfs_share/docker01 10.10.10.127(rw,insecure,sync,no_all_squash,anonuid=65534,anongid=65534) /home/nfs_share/docker01 10.10.10.102(ro,insecure,sync,no_all_squash,anonuid=65534,anongid=65534)
其中 rw是可读写，ro是只读
(3) 重启服务
service rpcbind restart
service nfs restart
exportfs -a
(4) 查看状态
# nfsstat Server rpc stats: calls badcalls badclnt badauth xdrcall 0 0 0 0 0
查看mount的目录
# showmount -e 10.10.10.101 Export list for 10.10.10.101: /home/nfs_share/docker01 10.10.10.102,10.10.10.127
2. #1上安装支持NFS的volume plugin driver
(1) 本次使用的driver是convoy (https://github.com/rancher/convoy)
下载，解压，安装
wget https://github.com/rancher/convoy/releases/download/v0.5.0/convoy.tar.gz tar xzvf convoy.tar.gz cp convoy/convoy convoy/convoy-pdata_tools /usr/local/bin/ mkdir -p /etc/docker/plugins/ bash -c 'echo "unix:///var/run/convoy/convoy.sock" > /etc/docker/plugins/convoy.spec'
(2) 挂载nfs共享目录，启动convoy daemon
mkdir /home/docker/nfs_share mount -t nfs 10.10.10.101:/home/nfs_share/docker01 /home/docker/nfs_share nohup convoy daemon --drivers vfs --driver-opts vfs.path=/home/docker/nfs_share &
nohup.out中有convoy daemon的启动日志：
time="2016-11-30T18:46:32+08:00" level=debug msg="Found existing config. Ignoring command line opts, loading config from /var/lib/rancher/convoy" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg= driver=vfs driver_opts=map[vfs.path:/home/docker/nfs_share] event=init pkg=daemon reason=prepare root="/var/lib/rancher/convoy" time="2016-11-30T18:46:32+08:00" level=debug msg= driver=vfs event=init pkg=daemon reason=complete time="2016-11-30T18:46:32+08:00" level=debug msg="Registering GET, /volumes/" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering GET, /snapshots/" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering GET, /backups/list" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering GET, /backups/inspect" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering GET, /info" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering GET, /volumes/list" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering POST, /volumes/umount" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering POST, /snapshots/create" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering POST, /backups/create" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering POST, /volumes/create" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering POST, /volumes/mount" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering DELETE, /volumes/" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering DELETE, /snapshots/" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering DELETE, /backups" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering plugin handler POST, /VolumeDriver.Get" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering plugin handler POST, /VolumeDriver.List" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering plugin handler POST, /Plugin.Activate" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering plugin handler POST, /VolumeDriver.Create" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering plugin handler POST, /VolumeDriver.Remove" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering plugin handler POST, /VolumeDriver.Mount" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering plugin handler POST, /VolumeDriver.Unmount" pkg=daemon time="2016-11-30T18:46:32+08:00" level=debug msg="Registering plugin handler POST, /VolumeDriver.Path" pkg=daemon
(3) 启动容器测试
docker run -t -i -v test_volume1:/test --volume-driver=convoy centos:6 /bin/bash
现在#2服务器上可以看到docker run建立的test_volume1目录
# ll /home/nfs_share/docker01/ 总用量 8 drwx------. 2 nfsnobody nfsnobody 4096 11月 30 19:11 config drwx------. 2 nfsnobody nfsnobody 4096 11月 30 19:11 test_volume1
在#2服务器上test_volume1生成1个文件测试:
# echo 'Test01-----' > test.txt
在容器里查看：
# ll total 4 -rw-r--r--. 1 root root 12 Nov 30 11:23 test.txt
#1服务器中查看已经挂载的卷
# convoy list { "test_volume1": { "Name": "test_volume1", "Driver": "vfs", "MountPoint": "/home/docker/nfs_share/test_volume1", "CreatedTime": "Wed Nov 30 19:10:51 +0800 2016", "DriverInfo": { "Driver": "vfs", "MountPoint": "/home/docker/nfs_share/test_volume1", "Path": "/home/docker/nfs_share/test_volume1", "PrepareForVM": "false", "Size": "0", "VolumeCreatedAt": "Wed Nov 30 19:10:51 +0800 2016", "VolumeName": "test_volume1" }, "Snapshots": {} } }
注意： convoy delete <volume_name>可以删除卷，删除卷会导致实际的目录和文件被物理删除。