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docker(5)容器数据卷(挂载)

juneyale 2022-01-27 阅读 46

出现的问题

Docker容器删除后,在容器中产生的数据不在了

希望Docker容器和外部机器可以直接交换文件

作用

1:容器数据持久化
2 :外部机器和容器间接通信
3 :容器之间数据交换

数据卷的配置

创建启动容器时,使用-v参数设置数据卷

docker run ... -v 宿主机目录(文件):容器内目录(文件)  --privileged=true

加上 --privileged=true的目的是为了避免出现权限不足,在容器里面使用不了ls等命令
注意事项:

控制台1执行界面

[root@localhost ~]# docker ps
CONTAINER ID        IMAGE                                                    COMMAND             CREATED             STATUS              PORTS               NAMES
d68a5648e52b        tomcat                                                   "catalina.sh run"   24 hours ago        Up 24 hours                             k8s_mytomcat.d8eff6f_mytomcat-kx737_default_dc3c5bc1-6154-11ec-b449-000c29e87ea6_408ba1e4
66640b2ae677        tomcat                                                   "catalina.sh run"   24 hours ago        Up 24 hours                             k8s_mytomcat.d8eff6f_mytomcat-lr7bh_default_dc3c6d5f-6154-11ec-b449-000c29e87ea6_0a6a0d17
84eaca90d55e        192.168.156.130:5000/google_containers/pause-amd64.3.0   "/pause"            24 hours ago        Up 24 hours                             k8s_POD.796d050f_mytomcat-kx737_default_dc3c5bc1-6154-11ec-b449-000c29e87ea6_74e395a7
caaa68970d72        192.168.156.130:5000/google_containers/pause-amd64.3.0   "/pause"            24 hours ago        Up 24 hours                             k8s_POD.796d050f_mytomcat-lr7bh_default_dc3c6d5f-6154-11ec-b449-000c29e87ea6_ef3bbdf9
[root@localhost ~]# pwd
/root
[root@localhost ~]# docker run -it --name=c1 -v /root/data:/root/data_container --privileged=true  centos /bin/bash
[root@fce71c82a7bd /]# cd /root
[root@fce71c82a7bd ~]# ls
anaconda-ks.cfg  anaconda-post.log  data_container  original-ks.cfg
[root@fce71c82a7bd ~]# cd data_container/
[root@fce71c82a7bd data_container]# ls
test.txt
[root@fce71c82a7bd data_container]# 

控制台2执行界面

Last login: Tue Dec 21 14:31:48 2021 from 192.168.156.1
[root@localhost ~]# ls
anaconda-ks.cfg  data  initial-setup-ks.cfg  公共  模板  视频  图片  文档  下载  音乐  桌面
[root@localhost ~]# cd data/
[root@localhost data]# ls
[root@localhost data]# touch test.txt
[root@localhost data]# ls
test.txt

通过上面的配置之后,容器和其宿主机之间便可以进行文件的同步

而且删除容器之后,宿主机挂载的目录里面的内容还是在的

持久化的功能实现:

两个容器进行通信

两个容器通过挂载同一个宿主机目录实现文件数据的共享

控制台1执行界面:

[root@localhost ~]# docker ps
CONTAINER ID        IMAGE                                                    COMMAND             CREATED             STATUS              PORTS               NAMES
d68a5648e52b        tomcat                                                   "catalina.sh run"   24 hours ago        Up 24 hours                             k8s_mytomcat.d8eff6f_mytomcat-kx737_default_dc3c5bc1-6154-11ec-b449-000c29e87ea6_408ba1e4
66640b2ae677        tomcat                                                   "catalina.sh run"   24 hours ago        Up 24 hours                             k8s_mytomcat.d8eff6f_mytomcat-lr7bh_default_dc3c6d5f-6154-11ec-b449-000c29e87ea6_0a6a0d17
84eaca90d55e        192.168.156.130:5000/google_containers/pause-amd64.3.0   "/pause"            24 hours ago        Up 24 hours                             k8s_POD.796d050f_mytomcat-kx737_default_dc3c5bc1-6154-11ec-b449-000c29e87ea6_74e395a7
caaa68970d72        192.168.156.130:5000/google_containers/pause-amd64.3.0   "/pause"            24 hours ago        Up 24 hours                             k8s_POD.796d050f_mytomcat-lr7bh_default_dc3c6d5f-6154-11ec-b449-000c29e87ea6_ef3bbdf9
[root@localhost ~]# pwd
/root
[root@localhost ~]# docker run -it --name=c1 -v /root/data:/root/data_container --privileged=true  centos /bin/bash
[root@fce71c82a7bd /]# cd /root
[root@fce71c82a7bd ~]# ls
anaconda-ks.cfg  anaconda-post.log  data_container  original-ks.cfg
[root@fce71c82a7bd ~]# cd data_container/
[root@fce71c82a7bd data_container]# ls
test.txt
[root@fce71c82a7bd data_container]# touch com.txt 
[root@fce71c82a7bd data_container]# 

控制台2执行界面:

[root@localhost ~]# cd data/
[root@localhost data]# ls
[root@localhost data]# touch test.txt
[root@localhost data]# ls
test.txt
[root@localhost data]# docker ps
CONTAINER ID        IMAGE                                                    COMMAND             CREATED             STATUS              PORTS               NAMES
7da1d8ee3d2c        centos                                                   "/bin/bash"         2 minutes ago       Up 2 minutes                            c1
d68a5648e52b        tomcat                                                   "catalina.sh run"   23 hours ago        Up 23 hours                             k8s_mytomcat.d8eff6f_mytomcat-kx737_default_dc3c5bc1-6154-11ec-b449-000c29e87ea6_408ba1e4
66640b2ae677        tomcat                                                   "catalina.sh run"   23 hours ago        Up 23 hours                             k8s_mytomcat.d8eff6f_mytomcat-lr7bh_default_dc3c6d5f-6154-11ec-b449-000c29e87ea6_0a6a0d17
84eaca90d55e        192.168.156.130:5000/google_containers/pause-amd64.3.0   "/pause"            23 hours ago        Up 23 hours                             k8s_POD.796d050f_mytomcat-kx737_default_dc3c5bc1-6154-11ec-b449-000c29e87ea6_74e395a7
caaa68970d72        192.168.156.130:5000/google_containers/pause-amd64.3.0   "/pause"            23 hours ago        Up 23 hours                             k8s_POD.796d050f_mytomcat-lr7bh_default_dc3c6d5f-6154-11ec-b449-000c29e87ea6_ef3bbdf9
[root@localhost data]# ls
com.txt  test.txt
[root@localhost data]# 

控制台3执行界面:

[root@localhost ~]# docker run -it --name=c2 -v /root/data:/root/data --privileged=true  centos /bin/bash
[root@49cdd030a98e /]# cd /root/data/
[root@49cdd030a98e data]# ls
test.txt
[root@49cdd030a98e data]# ls
com.txt  test.txt
[root@49cdd030a98e data]# 
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