宿主机与容器共享数据卷-数据持久化

docker run -it -v /宿主机绝对路径目录:/容器内目录 镜像名 #-v:数据卷 ，默认可读写

[root@weblamp /]# docker run -it -v /myDataVolume:/dataVolumeContainer centos
[root@4770fe12d568 /]#
[root@4770fe12d568 /]# ll
total 60
-rw-r--r-- 1 root root 12076 Dec 5 01:37 anaconda-post.log
lrwxrwxrwx 1 root root 7 Dec 5 01:36 bin -> usr/bin
drwxr-xr-x 2 root root 4096 Jan 11 09:21 dataVolumeContainer
drwxr-xr-x 5 root root 380 Jan 11 09:21 dev
drwxr-xr-x 47 root root 4096 Jan 11 09:21 etc
drwxr-xr-x 2 root root 4096 Apr 11 2018 home
lrwxrwxrwx 1 root root 7 Dec 5 01:36 lib -> usr/lib
lrwxrwxrwx 1 root root 9 Dec 5 01:36 lib64 -> usr/lib64
drwxr-xr-x 2 root root 4096 Apr 11 2018 media
drwxr-xr-x 2 root root 4096 Apr 11 2018 mnt
drwxr-xr-x 2 root root 4096 Apr 11 2018 opt
dr-xr-xr-x 101 root root 0 Jan 11 09:21 proc
dr-xr-x--- 2 root root 4096 Dec 5 01:37 root
drwxr-xr-x 11 root root 4096 Dec 5 01:37 run
lrwxrwxrwx 1 root root 8 Dec 5 01:36 sbin -> usr/sbin
drwxr-xr-x 2 root root 4096 Apr 11 2018 srv
drwxr-xr-x 13 root root 0 Jan 11 09:16 sys
drwxrwxrwt 7 root root 4096 Dec 5 01:37 tmp
drwxr-xr-x 13 root root 4096 Dec 5 01:36 usr
drwxr-xr-x 18 root root 4096 Dec 5 01:36 var
[root@4770fe12d568 /]#

#宿主机里查看
[root@weblamp /]# ls
bin cgroup dev home lib64 media myDataVolume proc sbin srv tmp var
boot data etc lib lost+found mnt opt root selinux sys usr

#测试容器停止后，修改主机myDataVolume目录里面的数据，验证数据同步功能
[root@weblamp /]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS
NAMES
4770fe12d568 centos "/bin/bash" 17 hours ago Up 7 minutes
adoring_poitras

#使用inspect 命令查看是否绑定数据卷

[root@weblamp /]# docker inspect 4770fe12d568 

"Driver": "devicemapper",
"ExecDriver": "native-0.2",
"MountLabel": "",
"ProcessLabel": "",
"Volumes": {
"/dataVolumeContainer": "/myDataVolume"
},
"VolumesRW": {
"/dataVolumeContainer": true
},
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": [
"/myDataVolume:/dataVolumeContainer"
],
"ContainerIDFile": "",
"LxcConf": [],
"Memory": 0,
"MemorySwap": 0,
------------------------------
docker run -it -v /宿主机绝对路径目录:/容器内目录:ro 镜像名 #容器里面的目录只读
#使用dockerFile实现数据的持久化存储

[root@weblamp ~]# mkdir /mydocker
[root@weblamp ~]# cd /mydocker/
[root@weblamp mydocker]# pwd
/mydocker
[root@weblamp mydocker]# vim Dockerfile
[root@weblamp mydocker]# cat Dockerfile
# volume test
FROM centos
VOLUME ["/dataVolumeContainer1","/dataVolumeContainer2"]
CMD echo "finished,-----------successl"
CMD /bin/bash
# . 表示当前目录
[root@weblamp mydocker]# docker build -f /mydocker/Dockerfile -t alvin/centos .
Sending build context to Docker daemon 2.048 kB
Sending build context to Docker daemon
Step 0 : FROM centos
---> ab9a80ab07d0
Step 1 : VOLUME /dataVolumeContainer1 /dataVolumeContainer2
---> Running in 1df5eaf31283
---> 6ce40a69a0fc
Removing intermediate container 1df5eaf31283
Step 2 : CMD echo "finished,-----------successl"
---> Running in 6fe6f3cc0f5d
---> 6c9583d31017
Removing intermediate container 6fe6f3cc0f5d
Step 3 : CMD /bin/bash
---> Running in 831931db7316
---> d7609a14297c
Removing intermediate container 831931db7316
Successfully built d7609a14297c

[root@weblamp mydocker]# docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
alvin/centos latest d7609a14297c About a minute ago 201.8 MB
atguigu/mytomcat 1.1 4a262f07577c 25 hours ago 462.5 MB
hello-world latest 9f5834b25059 11 days ago 1.84 kB
tomcat latest 0260919306ba 13 days ago 462.4 MB
nginx latest 62d0e0b67f32 2 weeks ago 109.2 MB
centos latest ab9a80ab07d0 5 weeks ago 201.8 MB

[root@weblamp mydocker]# docker images alvin/centos
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
alvin/centos latest d7609a14297c 2 minutes ago 201.8 MB
[root@weblamp mydocker]# docker run -it alvin/centos
[root@801c9707dbc5 /]# pwd
/
[root@801c9707dbc5 /]# ll
total 64
-rw-r--r-- 1 root root 12076 Dec 5 01:37 anaconda-post.log
lrwxrwxrwx 1 root root 7 Dec 5 01:36 bin -> usr/bin
drwxr-xr-x 2 root root 4096 Jan 12 07:50 dataVolumeContainer1
drwxr-xr-x 2 root root 4096 Jan 12 07:50 dataVolumeContainer2
drwxr-xr-x 5 root root 380 Jan 12 07:50 dev
drwxr-xr-x 47 root root 4096 Jan 12 07:50 etc
drwxr-xr-x 2 root root 4096 Apr 11 2018 home
lrwxrwxrwx 1 root root 7 Dec 5 01:36 lib -> usr/lib
lrwxrwxrwx 1 root root 9 Dec 5 01:36 lib64 -> usr/lib64
drwxr-xr-x 2 root root 4096 Apr 11 2018 media
drwxr-xr-x 2 root root 4096 Apr 11 2018 mnt
drwxr-xr-x 2 root root 4096 Apr 11 2018 opt
dr-xr-xr-x 99 root root 0 Jan 12 07:50 proc
dr-xr-x--- 2 root root 4096 Dec 5 01:37 root
drwxr-xr-x 11 root root 4096 Dec 5 01:37 run

[root@801c9707dbc5 /]# cd dataVolumeContainer1
[root@801c9707dbc5 dataVolumeContainer1]# ll
total 0
[root@801c9707dbc5 dataVolumeContainer1]# touch aa.txt

#去宿主机里查看对应的目录
[root@weblamp /]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS
NAMES
801c9707dbc5 alvin/centos "/bin/sh -c /bin/bas 50 minutes ago Up 50 minutes
hopeful_tesla
[root@weblamp /]# docker inspect 801c9707dbc5

"Name": "/hopeful_tesla",
"RestartCount": 0,
"Driver": "devicemapper",
"ExecDriver": "native-0.2",
"MountLabel": "",
"ProcessLabel": "",
"Volumes": {
"/dataVolumeContainer1":
"/var/lib/docker/volumes/273ea5a64df76b1bc4197bedc88750dfc9228fcec7e5f12981d515c845fcb72c/_data",
"/dataVolumeContainer2":
"/var/lib/docker/volumes/5b528cf1db7f80bb0be92021dd60cd73426c0dc28b19ca343507e37cff6a0182/_data"
},
"VolumesRW": {
"/dataVolumeContainer1": true,
"/dataVolumeContainer2": true
},
"AppArmorProfile": "",

[root@weblamp /]# cd /var/lib/docker/volumes/273ea5a64df76b1bc4197bedc88750dfc9228fcec7e5f12981d515c845fcb72c/_data
[root@weblamp _data]# ll
total 0
-rw-r--r-- 1 root root 0 Jan 12 16:41 aa.txt
[root@weblamp _data]#

#容器数据卷
[root@weblamp /]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS
NAMES
[root@weblamp /]# docker run -it --name dc01 alvin/centos
[root@d739c8114ccb /]# ll
total 64
-rw-r--r-- 1 root root 12076 Dec 5 01:37 anaconda-post.log
lrwxrwxrwx 1 root root 7 Dec 5 01:36 bin -> usr/bin
drwxr-xr-x 2 root root 4096 Jan 12 08:49 dataVolumeContainer1
drwxr-xr-x 2 root root 4096 Jan 12 08:49 dataVolumeContainer2
drwxr-xr-x 5 root root 380 Jan 12 08:49 dev

[root@d739c8114ccb /]# cd dataVolumeContainer2
[root@d739c8114ccb dataVolumeContainer2]# pwd
/dataVolumeContainer2

[root@d739c8114ccb dataVolumeContainer2]# touch dc01add.txt
[root@d739c8114ccb dataVolumeContainer2]# ll
total 0
-rw-r--r-- 1 root root 0 Jan 12 08:50 dc01add.txt

ctrl+p+q
[root@d739c8114ccb dataVolumeContainer2]# [root@weblamp /]#
[root@weblamp /]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS
NAMES
d739c8114ccb alvin/centos "/bin/sh -c /bin/bas 3 minutes ago Up 3 minutes
dc01

#--volumes-from 容器间传递数据共享
[root@weblamp /]# docker run -it --name dc02 --volumes-from dc01 alvin/centos 
[root@319fc3eac74c /]#
[root@319fc3eac74c /]# ll
total 64
-rw-r--r-- 1 root root 12076 Dec 5 01:37 anaconda-post.log
lrwxrwxrwx 1 root root 7 Dec 5 01:36 bin -> usr/bin
drwxr-xr-x 2 root root 4096 Jan 12 08:49 dataVolumeContainer1
drwxr-xr-x 2 root root 4096 Jan 12 08:50 dataVolumeContainer2
drwxr-xr-x 5 root root 380 Jan 12 08:54 dev
drwxr-xr-x 47 root root 4096 Jan 12 08:54 etc

#容器之间配置信息的传递，数据卷的生命周期一直持续到没有容器使用它为止。删除其中一个共享不受影响

# dockerfile 就是镜像的文件构建文件
# dockerfile编写 --->docker buile --->docker run

[root@319fc3eac74c /]# cd dataVolumeContainer2
[root@319fc3eac74c dataVolumeContainer2]# pwd
/dataVolumeContainer2
[root@319fc3eac74c dataVolumeContainer2]# ll
total 0
-rw-r--r-- 1 root root 0 Jan 12 08:50 dc01add.txt
[root@319fc3eac74c dataVolumeContainer2]#