Docker (3) 数据卷管理和convoy插件

谁借莪１个温暖的怀抱￠ 2022-12-05 10:28 111阅读 0赞

### 文章目录 ###

*   *   *  Docker数据卷管理
         *   *  docker managed volume
             *  bind mount
             *   *  部署nginx和php
         *  Docker卷插件
         *   *  convoy 插件
             *   *  配置nfs
                 *  配置convoy 插件
                 *  在不同主机间共享卷
                 *  清理存储

### Docker数据卷管理 ###

*  为什么要用数据卷？  
    docker 原生使用的是 联合文件系统 性能差 生命周期与容器相同
 *  数据卷的 优点  
    1， 直接mount到容器中 绕开了分层文件系统  
    2， 性能和主机磁盘相同，并且不会因容器删除而删除  
    3, 修改方便，不用进入容器内部，对容器 侵入小

#### docker managed volume ####

在dockerfile中使用VOLUME 关键字 声明 挂载 称为 docker管理卷

VOLUME ["<路径1>", "<路径2>"...]

#### bind mount ####

在 docker run 中 加上 -v 选项 挂载 称为 bind mount

-v <host path>:<container path>

挂载nginx html

[root@server1 ~]# tree html/
    html/
    └── index.html
    
    0 directories, 1 file
    [root@server1 ~]# docker run -d --name web -v /root/html:/usr/share/nginx/html nginx
    
    [root@server1 ~]# curl 172.17.0.2
    hello world

##### 部署nginx和php #####

*  下载nginx和php镜像  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQxNDAyNQ_size_16_color_FFFFFF_t_70_pic_cnter]
 *  创建存储卷

[root@server1 ~]# docker volume create html
    [root@server1 ~]# docker volume create conf

*  启动容器

[root@server1 ~]# docker run -d --name web -v conf:/etc/nginx/conf.d -v html:/usr/share/nginx/html -p 80:80  nginx
    82559c72a99e8c28a49e70659d92d7667a0259e4e19862b9a44193f6b1fede94
    [root@server1 ~]# docker run -d --name php  -v html:/usr/share/nginx/html php-fpm
    52973c4cd2bd6ee725b51c6dab56126fac7f166da4293704929cc2d95c422406

*  访问  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQxNDAyNQ_size_16_color_FFFFFF_t_70_pic_cnter 1]

### Docker卷插件 ###

docker卷默认使用的是local类型的驱动，只能存在于宿主机，跨主机的volume就需要第三方驱动。  
[docker官方][docker]只提供了插件api，开发者可以根据实际需求定制插件驱动。

#### convoy 插件 ####

##### 配置nfs #####

在server1

[root@server1 ~]#  yum install -y nfs-utils.x86_64
    [root@server1 ~]#  systemctl start rpcbind
    [root@server1 ~]#  cat /etc/exports
    nfsdata *(rw,sync,no_root_squash)
    [root@server1 ~]#  mkdir /nfsdata
    [root@server1 ~]#  systemctl start  nfs
    [root@server1 ~]#  exportfs -rv

在server2

[root@server2 ~]#  yum install -y nfs-utils.x86_64
    [root@server2 ~]#  systemctl start rpcbind
    [root@server2 ~]# mkdir /nfsdata
    [root@server2 ~]# showmount -e server1
    Export list for server1:
    /nfsdata *
    [root@server2 ~]# mount server1:/nfsdata /nfsdata
    [root@server2 ~]# df 
    Filesystem            1K-blocks    Used Available Use% Mounted on
    /dev/mapper/rhel-root   8374272 1942564   6431708  24% /
    devtmpfs                 495252       0    495252   0% /dev
    tmpfs                    507368       0    507368   0% /dev/shm
    tmpfs                    507368    6944    500424   2% /run
    tmpfs                    507368       0    507368   0% /sys/fs/cgroup
    /dev/vda1               1038336  135272    903064  14% /boot
    tmpfs                    101476       0    101476   0% /run/user/0
    server1:/nfsdata        8374272 6077184   2297088  73% /nfsdata

##### 配置convoy 插件 #####

[下载convoy 插件][convoy]

[root@server1 ~]# tar xzf convoy.tar.gz 
    [root@server1 ~]# cd convoy/
    [root@server1 convoy]# cp convoy convoy-pdata_tools /usr/local/bin/

[root@server1 convoy]# convoy daemon --drivers vfs --driver-opts vfs.path=/nfsdata &
    [1] 10734
    [root@server1 convoy]# DEBU[0000] Creating config at /var/lib/rancher/convoy    pkg=daemon
    DEBU[0000]                                               driver=vfs driver_opts=map[vfs.path:/nfsdata] event=init pkg=daemon reason=prepare root=/var/lib/rancher/convoy
    DEBU[0000]                                               driver=vfs event=init pkg=daemon reason=complete
    DEBU[0000] Registering POST, /volumes/umount             pkg=daemon
    DEBU[0000] Registering POST, /snapshots/create           pkg=daemon
    DEBU[0000] Registering POST, /backups/create             pkg=daemon
    DEBU[0000] Registering POST, /volumes/create             pkg=daemon
    DEBU[0000] Registering POST, /volumes/mount              pkg=daemon
    DEBU[0000] Registering DELETE, /backups                  pkg=daemon
    DEBU[0000] Registering DELETE, /volumes/                 pkg=daemon
    DEBU[0000] Registering DELETE, /snapshots/               pkg=daemon
    DEBU[0000] Registering GET, /volumes/                    pkg=daemon
    DEBU[0000] Registering GET, /snapshots/                  pkg=daemon
    DEBU[0000] Registering GET, /backups/list                pkg=daemon
    DEBU[0000] Registering GET, /backups/inspect             pkg=daemon
    DEBU[0000] Registering GET, /info                        pkg=daemon
    DEBU[0000] Registering GET, /volumes/list                pkg=daemon
    DEBU[0000] Registering plugin handler POST, /VolumeDriver.Create  pkg=daemon
    DEBU[0000] Registering plugin handler POST, /VolumeDriver.Remove  pkg=daemon
    DEBU[0000] Registering plugin handler POST, /VolumeDriver.Mount  pkg=daemon
    DEBU[0000] Registering plugin handler POST, /VolumeDriver.Unmount  pkg=daemon
    DEBU[0000] Registering plugin handler POST, /VolumeDriver.Path  pkg=daemon
    DEBU[0000] Registering plugin handler POST, /VolumeDriver.Get  pkg=daemon
    DEBU[0000] Registering plugin handler POST, /VolumeDriver.List  pkg=daemon
    DEBU[0000] Registering plugin handler POST, /Plugin.Activate  pkg=daemon
    [root@server1 convoy]# mkdir /etc/docker/plugins
    [root@server1 convoy]# echo "unix:///var/run/convoy/convoy.sock" > /etc/docker/plugins/convoy.spec
    [root@server1 convoy]# ll /etc/docker/plugins/convoy.spec 
    -rw-r--r-- 1 root root 35 Sep 10 18:12 /etc/docker/plugins/convoy.spec

##### 在不同主机间共享卷 #####

创建卷：

[root@server1 plugins]# convoy create vol1
    DEBU[0340] Calling: POST, /volumes/create, request: POST, /v1/volumes/create  pkg=daemon
    DEBU[0340]                                               event=create object=volume opts=map[VolumeType: VolumeIOPS:0 PrepareForVM:false Size:0 BackupURL: VolumeName:vol1 VolumeDriverID:] pkg=daemon reason=prepare volume=vol1
    DEBU[0340] Created volume                                event=create object=volume pkg=daemon reason=complete volume=vol1
    DEBU[0340] Response:  vol1                               pkg=daemon
    vol1
    [root@server1 plugins]# convoy list
    {
        
            "vol1": {
        
                    "Name": "vol1",
                    "Driver": "vfs",
                    "MountPoint": "",
                    "CreatedTime": "Thu Sep 10 19:28:47 +0800 2020",
                    "DriverInfo": {
        
                            "Driver": "vfs",
                            "MountPoint": "",
                            "Path": "/nfsdata/vol1",
                            "PrepareForVM": "false",
                            "Size": "0",
                            "VolumeCreatedAt": "Thu Sep 10 19:28:47 +0800 2020",
                            "VolumeName": "vol1"
                    },
                    "Snapshots": {
        }
            }
    }

运行nginx

docker run -d --name web -v vol1:/usr/share/nginx/html nginx

写入测试页：

[root@server1 plugins]# echo hello world > /nfsdata/vol1/index.html 
    [root@server1 plugins]# curl localhost
    hello world

共享vol1

[root@server2 packages]# curl localhost
    hello world

假如server1 docker宕掉 server2 数据不受影响 可以无损迁移容器

##### 清理存储 #####

在server2中：

convoy delete vol1  #先删除所有占用存储的容器
    umount /nfsdata  # 卸载磁盘

[root@server2 packages]# convoy delete vol1
    DEBU[1284] Calling: DELETE, /volumes/, request: DELETE, /v1/volumes/  pkg=daemon
    DEBU[1284]                                               event=delete object=volume pkg=daemon reason=prepare volume=vol1
    DEBU[1284] Cleaning up /nfsdata/vol1 for volume vol1     pkg=vfs
    DEBU[1284]                                               event=delete object=volume pkg=daemon reason=complete volume=vol1
    
    [root@server2 packages]# umount /nfsdata/
    [root@server2 packages]# convoy list
    {
        }
    [root@server2 packages]# docker volume ls
    DEBU[1321] Handle plugin list volume: POST /VolumeDriver.List  pkg=daemon
    DEBU[1321] Successfully got volume list for docker.      pkg=daemon
    DEBU[1321] Response:  {
        }                                 pkg=daemon
    DRIVER              VOLUME NAME

在server1中：

[root@server1 plugins]# convoy list
    {
        }
    [root@server1 plugins]# docker volume ls
    DEBU[1578] Handle plugin list volume: POST /VolumeDriver.List  pkg=daemon
    DEBU[1578] Successfully got volume list for docker.      pkg=daemon
    DEBU[1578] Response:  {
        }                                 pkg=daemon
    DRIVER              VOLUME NAME
    [root@server1 plugins]# fg
    convoy daemon --drivers vfs --driver-opts vfs.path=/nfsdata     (wd: ~)
    ^CCaught signal interrupt: shutting down.
    DEBU[1586] Cleaning up environment...                    pkg=daemon
    ERRO[1586] http server erroraccept unix /var/run/convoy/convoy.sock: use of closed network connection  pkg=daemon

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQxNDAyNQ_size_16_color_FFFFFF_t_70_pic_cnter]: /images/20221123/53235e89e6314a43a6dc9c9914bc998e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzQxNDAyNQ_size_16_color_FFFFFF_t_70_pic_cnter 1]: /images/20221123/6e447ba572ba4dd58c70fc53f2b6ca57.png
[docker]: https://docs.docker.com/engine/extend/legacy_plugins/#volume-plugins
[convoy]: https://link.jianshu.com/?t=https://github.com/rancher/convoy