bind mount共享数据

创建一个共享页面目录

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[root@localhost ~]# mkdir htdocs/
[root@localhost ~]# echo "hello" > htdocs/index.html

然后进行bind mount的方式共享数据

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[root@localhost ~]# docker run -d -p 80 --name web0 --volume /root/htdocs/:/usr/local/apahce2/htdocs httpd
2ac16608128f2ac9462cbded6b0a92b1c210d9c34d7a56278b3b4f6e64e400d9
[root@localhost ~]# docker run -d -p 80 --name web1 --volume /root/htdocs/:/usr/local/apahce2/htdocs httpd
5f2f8214a377541f2c35512bdd241c43d356e32a052bc6a9d683124412b77ea2
[root@localhost ~]# docker run -d -p 80 --name web2 --volume /root/htdocs/:/usr/local/apahce2/htdocs httpd
a51b1477241634d0f66e51c4a7d3d6595128cc30f98c4c70732ed60e6fd92cc8
[root@localhost ~]# docker ps
CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS              PORTS                   NAMES
a51b14772416        httpd               "httpd-foreground"   9 seconds ago       Up 8 seconds        0.0.0.0:32770->80/tcp   web2
5f2f8214a377        httpd               "httpd-foreground"   14 seconds ago      Up 14 seconds       0.0.0.0:32769->80/tcp   web1
2ac16608128f        httpd               "httpd-foreground"   25 seconds ago      Up 24 seconds       0.0.0.0:32768->80/tcp   web0
# 分别访问不同容器映射到主机的端口
[root@localhost ~]# curl 172.16.1.16:32770
hello
[root@localhost ~]# curl 172.16.1.16:32769
hello
[root@localhost ~]# curl 172.16.1.16:32768
hello

卷容器共享数据

volume container：专门为其他容器提供volume的容器
volume container既可以通过bind mount共享数据库，也可以通过manage volume来共享数据

创建一个卷容器

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[root@localhost ~]# docker create --name vc_data --volume /root/htdocs/:/usr/local/apache2/htdocs \
--volume test:/usr/local/apache2/logs busybox
139ec94bf4cc9dc9198e831ac4ff6e39b166d38c7bda2b3993a35130e59ab975

--volume /root/htdocs/:/usr/local/apache2/htdocs：将本地的htdocs目录以bind mount方式挂载到容器中的htdocs目录中
--volume test:/usr/local/apache2/logs：将容器中的logs目录以manage volume的方式映射到物理机本地，volume 名为test

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[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND              CREATED             STATUS              PORTS                   NAMES
139ec94bf4cc        busybox             "sh"                 4 minutes ago       Created                                     vc_data
a51b14772416        httpd               "httpd-foreground"   11 minutes ago      Up 11 minutes       0.0.0.0:32770->80/tcp   web2
5f2f8214a377        httpd               "httpd-foreground"   11 minutes ago      Up 11 minutes       0.0.0.0:32769->80/tcp   web1
2ac16608128f        httpd               "httpd-foreground"   12 minutes ago      Up 12 minutes       0.0.0.0:32768->80/tcp   web0

查看卷列表

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[root@localhost ~]# docker volume ls
DRIVER              VOLUME NAME
local               test

查看卷容器的挂载信息

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[root@localhost ~]# docker inspect vc_data 
	# 找到以下关键信息
	        "Mounts": [
	            {
	                "Type": "bind",  # bind mount 共享数据
	                "Source": "/root/htdocs",
	                "Destination": "/usr/local/apache2/htdocs",
	                "Mode": "",
	                "RW": true,
	                "Propagation": "rprivate"
	            },
	            {
	                "Type": "volume",  # manage volume共享数据
	                "Name": "test",
	                "Source": "/var/lib/docker/volumes/test/_data",
	                "Destination": "/usr/local/apache2/logs",
	                "Driver": "local",
	                "Mode": "",
	                "RW": true,
	                "Propagation": ""
	            }
	        ],

使用卷容器连接其他容器

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[root@localhost ~]# docker run -d -p 80 --volumes-from vc_data --name web3 httpd
	0e352478964ac86658db8e72f796bd188f2f269dbdaf41f69816df94c06ee0b7
[root@localhost ~]# docker run -d -p 80 --volumes-from vc_data --name web4 httpd
	e966b5860bfd9f063e541791adaeef59b01f4c5595ff7462d5cad3d8ccb1e6bd
[root@localhost ~]# docker run -d -p 80 --volumes-from vc_data --name web5 httpd
	390ac7c88206d4c56c1c4dcc7ac9ecda877fcc0587920fe25ffc15a39ef59efc
    
[root@localhost ~]# docker ps
PORTS                   NAMES
0.0.0.0:32773->80/tcp   web5
0.0.0.0:32772->80/tcp   web4
0.0.0.0:32771->80/tcp   web3

访问

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[root@localhost ~]# curl 172.16.1.16:32771
hello
[root@localhost ~]# curl 172.16.1.16:32772
hello
[root@localhost ~]# curl 172.16.1.16:32773
hello