docker data volume container (corresponding persistent)

Docker Profile

# What is: 
    Similar redis of RDB and AOF, (more popular to say the equivalent of mobile hard disk) 

# can do 
    1 , container persistence
     2, between the container inherit + persistence 

# how to use 
    a direct command to add (-v)
　　　　# Docker RUN -v host directory: image name directory container (docker run -it image name, this memory comparison) 
           Example: RUN Expediting IT Docker -v / myVolume: / containVolume CentOS   
   
       1.1 provided read-only access to the container (the host can be modified container Read only) 
          Docker RUN -v host directory: container directories: RO-only image name Read 
          Docker RUN Expediting IT -v / myVolume: / containVolume: RO CentOS  

     2, was added DockerFile    

 

 

Second, the use

1, the command added

[root @ linuxxx ~] # Docker RUN -it -v / myVolume: / containVolume CentOS 

# can automatically create a new directory 
# After you perform this sentence, has produced a binding relationship, 
you can use docker inspect ID Check Volumes or hostconfig 


respectively host vessel and into the respective end of file 
[@ linuxxx the root /] # CD myVolume / # native Linux end, host 
[@ linuxxx the root myVolume] # CAT b.txt 
a123qwer 

[@ f3c17a0046ed the root /] # CD containVolume / # container end 
[ @ f3c17a0046ed containVolume root] # vi b.txt        

# conclusion: either the host or create a file container or, modify the file or, can share resources
 
------------------ -------------------- # when the container exit, modified during which the host before reconnecting, is valid for container


[root @ c23bbbea6835 /] # Exit 
Exit 

# to the host, 
[root @ linuxxx myVolume] # Touch c.txt 
[root @ linuxxx myVolume] # vi c.txt added 123 # 


# to the container, and re-visit the 
[root @ ~ linuxxx] # Docker get PS # -l ID, 

[root @ linuxxx ~] #  
[root @ linuxxx ~] # Docker Start run # f3c17a0046ed container 
f3c17a0046ed 
[root @ linuxxx ~] # Docker into the container the attach f3c17a0046ed # 
[root @ f3c17a0046ed /] #  
[root @ f3c17a0046ed /] # cd containVolume / # to enter the bindings file
[@ f3c17a0046ed the root containVolume] #  
[@ f3c17a0046ed the root containVolume] # LL 
Total. 8 
-rw-R & lt -. r-- the root. 1 the root. 9-Aug. 6 11:40 b.txt
 -rw-R & lt - r--. 1. Aug 6 11:50 4 root root c.txt 
[root @ f3c17a0046ed containVolume] # CAT c.txt          
123 

Conclusion: after the introduction of the container, still shared with the host resources

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2, DockerFile add

# The above command add mode, supports only shared host and the container data 

# Because the host directory depend on the particular host, can not guarantee that all of the host there are specific directory 

usage:
     1 , create mydocker folder in the root directory and into the
     2 , can be added one or more data volumes to the mirror in the vOLUME command Dockerfile
     3 , the image generating build,
     . 4 , the container RUN
    

 

 

 

[root @ linuxxx ~] # mkdir / mydocker # Create a folder 
[root @ linuxxx ~] # cd / mydocker / # to enter the folder 
[root @ linuxxx mydocker] # vi Dockerfile # write
 
---------- ----------------------------------------- # valume the Test # write the contents of the FROM CentOS 
VOLUME [ " / datavolume1 " , " / datavolume2 " , " / datavolume3 " ,] 
the CMD echo " Finished, sucess1 -------- " 
the CMD / bin / the bash
 ------------- ------------------------------------------


# Binding 
 [@ linuxxx the root mydocker] # Docker Build -f / mydocker / Dockerfile pdun -t / CentOS. 

[@ Linuxxx the root mydocker] # Docker Images      
the REPOSITORY the TAG ID CREATED the IMAGE SIZE 
pdun / CentOS Latest 751b5f9475e5. 3 minutes ago Member 202MB 

[the root mydocker @linuxxx] # Docker RUN -it pdun / CentOS 

# can see if the successful creation of two containers 
[root @ 3c1a4034ed22 /] # LL 
drwxr-XR-the X-. 2 root root 6 Aug 6 14:02 datavolume1 
drwxr -xr- X. 2. 6-Aug. 6 the root the root 14:02 datavolume2 

#Into the container, create a file 
[root @ 3c1a4034ed22 /] # cd / datavolume1 
[root @ 3c1a4034ed22 datavolume1] # pwd 
/ datavolume1 
[root @ 3c1a4034ed22 datavolume1] # Touch contioner01.txt
 
-------------- -------------------------------------------------- -------- 
we did not create the host, come from 
let's open a new terminal 
[root @ linuxxx ~] # Docker PS 
CONTAINER PORTS the STATUS ID the IMAGE cREATED the COMMAND NAMES 
3c1a4034ed22 pdun / CentOS          " / bin / -c SH / bin / bash "    8 minutes ago Member Up 8 minutes                            angry_aryabhata
c44b284600fd        redis               "docker-entrypoint.s…"   5 hours ago         Up 5 hours          6379/tcp            vibrant_spence
[root@linuxxx ~]# 
[root@linuxxx ~]# docker inspect 3c1a4034ed22 

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