实战案例：容器数据卷四部曲（三）目录数据卷

一、在宿主机创建容器所使用的目录

root@ubuntu1804:~# mkdir /data/testdir
root@ubuntu1804:~# echo Test page on host > /data/testdir/index.html

二 、查看容器相关目录

root@ubuntu1804:~# docker images "*nginx*"
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx-ubuntu1804    1.20.2              244dd10f1b53        43 hours ago        402MB
nginx-ubuntu1804        1.20.2              99c6261cef9c        43 hours ago        213MBroot@ubuntu1804:~# docker run -it --rm nginx-ubuntu1804:1.20.2 bash
/ # cat /etc/nginx/conf/nginx.conf
...location / {root   /data/nginx/html;index  index.html index.htm;}
...
/ # cat /data/nginx/html/index.html
Test Page nginx-ubuntu1804
/ # exit
root@ubuntu1804:~# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

三、引用宿主机的数据卷启动容器

root@ubuntu1804:~# docker run -d -v /data/testdir:/data/nginx/html/ -p 8001:80 nginx-ubuntu1804:1.20.2
b9aae84935d6b1658440bd5277ec77432e6b8528cb79686596eda236b9c53367
root@ubuntu1804:~# docker run -d -v /data/testdir:/data/nginx/html/ -p 8002:80 nginx-ubuntu1804:1.20.2
10c1921c544c49c6f1f16c7886aadf305935a740d892ccc942e6012c43c2a07b
root@ubuntu1804:~# docker ps
CONTAINER ID        IMAGE                     COMMAND             CREATED             STATUS              PORTS                           NAMES
10c1921c544c        nginx-ubuntu1804:1.20.2   "nginx"             2 seconds ago       Up 1 second         443/tcp, 0.0.0.0:8002->80/tcp   modest_mclaren
b9aae84935d6        nginx-ubuntu1804:1.20.2   "nginx"             6 seconds ago       Up 6 seconds        443/tcp, 0.0.0.0:8001->80/tcp   gifted_haslettroot@ubuntu1804:~# curl  127.0.0.1:8001
Test page on host
root@ubuntu1804:~# curl  127.0.0.1:8002
Test page on host

四、进入到容器内测试写入数据

进入其中一个容器写书数据，其他容器的数据也变化

root@ubuntu1804:~# docker exec -it 3eeb3460e7eb bash
root@3eeb3460e7eb:/# cat /data/nginx/html/index.html
Test page on host
root@3eeb3460e7eb:/# echo Test page v2 on host > /data/nginx/html/index.html
root@3eeb3460e7eb:/# cat /data/nginx/html/index.html
Test page v2 on host# 进入另一个容器看到数据变化
root@ubuntu1804:~# docker exec -it b3382aba0c05 bash
root@b3382aba0c05:/# cat /data/nginx/html/index.html
Test page v2 on host# 访问应用
root@ubuntu1804:~# curl  127.0.0.1:8001
Test page v2 on host
root@ubuntu1804:~# curl  127.0.0.1:8002
Test page v2 on host

五、在宿主机修改数据

root@ubuntu1804:~# echo Test page v3 on host > /data/testdir/index.html
root@ubuntu1804:~# curl  127.0.0.1:8001
Test page v3 on host
root@ubuntu1804:~# curl  127.0.0.1:8002
Test page v3 on hostroot@ubuntu1804:~# docker exec -it 3eeb3460e7eb bash
root@3eeb3460e7eb:/# cat /data/nginx/html/index.html
Test page v3 on hostroot@ubuntu1804:~# docker exec -it b3382aba0c05 bash
root@b3382aba0c05:/# cat /data/nginx/html/index.html
Test page v3 on host

六、只读方法挂载数据卷

默认数据卷为可读可写，加ro选项，可以实现只读挂载，对于不希望容器修改的数据，比如：配置文件，脚本等，可以用此方式甜挂载

docker run -d -v /data/testdir:/data/nginx/html/:ro -p 8003:80 nginx-ubuntu1804:1.20.2
6239e42d735b75c4f2d8aaafdf7b57de466a2d2842fa3e25750979dcd7b49a1droot@ubuntu1804:~# docker exec -it 6239e42d735b bash
root@6239e42d735b:/# cat /data/nginx/html/index.html
Test page v3 on host
root@6239e42d735b:/# echo Test page v4 on host > /data/nginx/html/index.html
bash: /data/nginx/html/index.html: Read-only file system

七、删除容器

root@ubuntu1804:~# docker ps -a
CONTAINER ID        IMAGE                     COMMAND             CREATED              STATUS              PORTS                           NAMES
6239e42d735b        nginx-ubuntu1804:1.20.2   "nginx"             About a minute ago   Up About a minute   443/tcp, 0.0.0.0:8003->80/tcp   quirky_knuth
3eeb3460e7eb        nginx-ubuntu1804:1.20.2   "nginx"             10 minutes ago       Up 10 minutes       443/tcp, 0.0.0.0:8002->80/tcp   angry_davinci
b3382aba0c05        nginx-ubuntu1804:1.20.2   "nginx"             10 minutes ago       Up 10 minutes       443/tcp, 0.0.0.0:8001->80/tcp   dreamy_matsumoto
root@ubuntu1804:~# docker rm -f `docker ps -aq`
6239e42d735b
3eeb3460e7eb
b3382aba0c05
root@ubuntu1804:~# cat /data/testdir/index.html
Test page v3 on host# 新建的容器还可以继续使用原有的数据卷
root@ubuntu1804:~# docker run -d -v /data/testdir:/data/nginx/html/ -p 8004:80 nginx-ubuntu1804:1.20.2
3b0bfc442cd89d890e748b1afad19c2f71bb36b51a3d394ff1e9a9d1a8b3c41f
root@ubuntu1804:~# curl 127.0.0.1:8004
Test page v3 on host