Docker - 卷组管理(三)

偏执的太偏执、 2021-12-20 15:31 221阅读 0赞

## 一、不指定宿主机目录 ##

首先运行一个nginx容器  
docker run -d --name mynginx -p 8080:80 -v /usr/share/nginx/html nginx  
\--name 指定容器名字  
\-v 表示把docker里面的目录/usr/share/nginx/html映射出来

通过inspect命令查看宿主机对应的目录  
docker inspect mynginx  
省略部分输出  
"Mounts": \[  
     \{  
         "Type": "volume",  
         "Name": "fd6a85bb7a90ad465de3c5720d65576bff273b15b112cd3e62bb0d9d3f4a0c7a",  
         "Source": "/var/lib/docker/volumes/fd6a85bb7a90ad465de3c5720d65576bff273b15b112cd3e62bb0d9d3f4a0c7a/\_data",  
         "Destination": "/usr/share/nginx/html",  
         "Driver": "local",  
         "Mode": "",  
         "RW": true,  
         "Propagation": ""  
     \}  
\]  
可以看到docker里面的目录/usr/share/nginx/html对应到宿主机的目录为/var/lib/docker/volumes/354d406d5ec7f55bf445d70ac5f0534e1d185207a3f0b37e381af531a1d9ce37/\_data

修改宿主机的文件  
cd /var/lib/docker/volumes/354d406d5ec7f55bf445d70ac5f0534e1d185207a3f0b37e381af531a1d9ce37/\_data  
ls  
50x.html  index.html  
vi index.html  
<html>  
<p1>hello, I am nginx.</p1>  
</html>

进入到docker目录  
docker exec -it mynginx /bin/bash  
cd /usr/share/nginx/html/  
cat index.html  
<html>  
<p1>hello, I am nginx.</p1>  
</html>  
可以看到docker里面同步也进行了更改，打开网页[http://10.40.16.61:8080/][http_10.40.16.61_8080]

[![1][]][1 1]

## 二、指定宿主机目录 ##

cd /tmp  
mdkir html  
vi html/index.html  
<html>  
<p1>hello, I change index file.</p1>  
</html>

docker run -d --name mynginx1 -p 8081:80 -v $PWD/html:/usr/share/nginx/html nginx  
$PWD表示当前路径

通过inspect命令查看宿主机对应的目录  
docker inspect mynginx1  
省略部分输出  
"Mounts": \[  
     \{  
         "Type": "bind",  
         "Source": "/tmp/html",  
         "Destination": "/usr/share/nginx/html",  
         "Mode": "",  
         "RW": true,  
         "Propagation": "rprivate"  
     \}  
\]

打开网页[http://10.40.16.61:8081/][http_10.40.16.61_8081]

[![2][]][2 1]

## 三、卷组给多个容器共享 ##

mkdir myvolumes  
cd myvolumes  
mkdir data  
docker create -v $PWD/data:/var/mydata --name data\_container centos  
\# docker create只创建容器但不运行

docker run -it --volumes-from data\_container centos /bin/bash  
\# -it以交互方式运行  
mount | grep data  
/dev/sda2 on /var/mydata type xfs (rw,relatime,attr2,inode64,noquota)  
可以看到容器data\_container的/var/mydata目录同样也在新的容器的下  
cd /var/mydata  
touch nothing  
exit

ls /data  
nothing  
可以看到宿主机下面也有nothing这个文件，可以实现卷组给多个容器共享

转载于:https://www.cnblogs.com/ddzj01/p/10986216.html

[http_10.40.16.61_8080]: http://10.40.16.61:8080/
[1]: /images/20211220/e9d311016b764193b97e335eaaa9d17d.png
[1 1]: https://img2018.cnblogs.com/blog/1399177/201906/1399177-20190606174255846-317076602.png
[http_10.40.16.61_8081]: http://10.40.16.61:8081/
[2]: /images/20211220/eb1d102026684694bba6ab1f740b112d.png
[2 1]: https://img2018.cnblogs.com/blog/1399177/201906/1399177-20190606174257251-1025347991.png