数据卷dockerfile

dockerfile就是用来构建docker镜像的构建文件

写入命令脚本

通过这个脚本可以生成镜像，镜像是一层一层的，脚本一个个的命令，每个命令都是一层

[root@iZmu0fa4hv0jwzZ home]# mkdir docker-test-volume
[root@iZmu0fa4hv0jwzZ home]# ls
admin  ceshi  docker-test-volume  mysql
[root@iZmu0fa4hv0jwzZ home]# cd docker-test-volume/
[root@iZmu0fa4hv0jwzZ docker-test-volume]# vim dockerfile1
FROM centos
VOLUME ["/volume01","/volume02"]
CMD echo "---end---"
CMD /bin/bash
[root@iZmu0fa4hv0jwzZ docker-test-volume]# cat dockerfile1
FROM centos
VOLUME ["/volume01","/volume02"]
CMD echo "---end---"
CMD /bin/bash

 

　　

通过文件构建镜像

[root@iZmu0fa4hv0jwzZ docker-test-volume]# docker build -f ./dockerfile1 -t test/centos:1.0 .
Sending build context to Docker daemon  2.048kB
Step 1/4 : FROM centos
 ---> 300e315adb2f
Step 2/4 : VOLUME ["/volume01","/volume02"]
 ---> Running in 02359ee32d02
Removing intermediate container 02359ee32d02
 ---> f41d0aec0515
Step 3/4 : CMD echo "---end---"
 ---> Running in 549ca07d5fb2
Removing intermediate container 549ca07d5fb2
 ---> a72f1ec90a37
Step 4/4 : CMD /bin/bash
 ---> Running in 40583b2eae36
Removing intermediate container 40583b2eae36
 ---> b3b4d08ec5a9
Successfully built b3b4d08ec5a9
Successfully tagged test/centos:1.0

　　

[root@iZmu0fa4hv0jwzZ docker-test-volume]# docker images
REPOSITORY    TAG       IMAGE ID       CREATED         SIZE
test/centos   1.0       b3b4d08ec5a9   4 minutes ago   209MB
tomcat02      1.0       c93f6d59c630   15 hours ago    672MB
tomcat        9.0       5505f7218e4d   4 days ago      667MB
nginx         latest    d1a364dc548d   3 weeks ago     133MB
mysql         5.7       2c9028880e58   5 weeks ago     447MB
centos        latest    300e315adb2f   6 months ago    209MB

 

 启动自己写的容器

[root@iZmu0fa4hv0jwzZ docker-test-volume]# docker images
REPOSITORY    TAG       IMAGE ID       CREATED          SIZE
test/centos   1.0       11bfc295e9b3   15 seconds ago   209MB
tomcat02      1.0       c93f6d59c630   15 hours ago     672MB
tomcat        9.0       5505f7218e4d   4 days ago       667MB
nginx         latest    d1a364dc548d   3 weeks ago      133MB
mysql         5.7       2c9028880e58   5 weeks ago      447MB
centos        latest    300e315adb2f   6 months ago     209MB
[root@iZmu0fa4hv0jwzZ docker-test-volume]# docker run -it 11bfc295e9b3 /bin/bash
[root@f8871c5b6c95 /]# 

 

　启动成功，查看目录

[root@f8871c5b6c95 /]# ls -l
total 0
lrwxrwxrwx   1 root root   7 Nov  3  2020 bin -> usr/bin
drwxr-xr-x   5 root root 360 Jun 21 04:29 dev
drwxr-xr-x   1 root root  66 Jun 21 04:29 etc
drwxr-xr-x   2 root root   6 Nov  3  2020 home
lrwxrwxrwx   1 root root   7 Nov  3  2020 lib -> usr/lib
lrwxrwxrwx   1 root root   9 Nov  3  2020 lib64 -> usr/lib64
drwx------   2 root root   6 Dec  4  2020 lost+found
drwxr-xr-x   2 root root   6 Nov  3  2020 media
drwxr-xr-x   2 root root   6 Nov  3  2020 mnt
drwxr-xr-x   2 root root   6 Nov  3  2020 opt
dr-xr-xr-x 116 root root   0 Jun 21 04:29 proc
dr-xr-x---   2 root root 162 Dec  4  2020 root
drwxr-xr-x  11 root root 163 Dec  4  2020 run
lrwxrwxrwx   1 root root   8 Nov  3  2020 sbin -> usr/sbin
drwxr-xr-x   2 root root   6 Nov  3  2020 srv
dr-xr-xr-x  13 root root   0 Jun 21 04:29 sys
drwxrwxrwt   7 root root 145 Dec  4  2020 tmp
drwxr-xr-x  12 root root 144 Dec  4  2020 usr
drwxr-xr-x  20 root root 262 Dec  4  2020 var
drwxr-xr-x   2 root root   6 Jun 21 04:29 volume01
drwxr-xr-x   2 root root   6 Jun 21 04:29 volume02

 

可以发现我们自动挂载的数据卷目录，这个卷和外部一定有一个同步的目录

在容器内创建一个container.txt文件

[root@8dded46b27dd /]# cd volume01
[root@8dded46b27dd volume01]# ls
[root@8dded46b27dd volume01]# touch container.txt
[root@8dded46b27dd volume01]# ls
container.txt

 

在主机中查看镜像挂载目录

[root@iZmu0fa4hv0jwzZ ~]# docker ps
CONTAINER ID   IMAGE          COMMAND       CREATED              STATUS              PORTS     NAMES
8dded46b27dd   11bfc295e9b3   "/bin/bash"   About a minute ago   Up About a minute             frosty_kilby
[root@iZmu0fa4hv0jwzZ ~]# docker inspect 8dded46b27dd

 

可以看见mounts中有创建的数据卷

"Mounts": [
            {
                "Type": "volume",
                "Name": "1596e8f6dc06936b2b731603def387e1a64c45f609b61a8658472ad580fbf7c7",
                "Source": "/var/lib/docker/volumes/1596e8f6dc06936b2b731603def387e1a64c45f609b61a8658472ad580fbf7c7/_data",
                "Destination": "/volume01",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            },
            {
                "Type": "volume",
                "Name": "96975303ff0d506b1828cb0c1490423e2fc0934f6b73ba0bb30df01b2b28d4f4",
                "Source": "/var/lib/docker/volumes/96975303ff0d506b1828cb0c1490423e2fc0934f6b73ba0bb30df01b2b28d4f4/_data",
                "Destination": "/volume02",
                "Driver": "local",
                "Mode": "",
                "RW": true,
                "Propagation": ""
            }
        ],

 

转到主机的同步目录

[root@iZmu0fa4hv0jwzZ ~]# cd /var/lib/docker/volumes/1596e8f6dc06936b2b731603def387e1a64c45f609b61a8658472ad580fbf7c7/_data
[root@iZmu0fa4hv0jwzZ _data]# ls
container.txt

 

可以发现主机中存在容器中创建的文件