linux-centos7-docker-container storage for permanent preservation

Docker container
The Docker drawback is that the container is deleted, all the data in the container is deleted,
So for the long-term preservation of data requires an external data volume, or data container
According to my understanding ... is to attach a directory on the physical machine to the container and let the container use the physical directory to store the data
The command is also very simple, that is
-V Local directory: The container directory can not be created by itself, it will automatically create a directory without
-v/aaa:/aaa
Sometimes the physical machine does not shut down selinux, the container may not have permission, this time need to open the container to the privilege is --privileged=true to allow the container to use the Mount directory, or to turn off SELinux can
setenforce 0 temporary closure
Or have a permanent shutdown

Vim/etc/sysconfig/selinux

Selinux=disabled

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You can see the messages hanging in the Docker details

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If a separate-v/var only specifies the container directory,
A directory supply mount is automatically generated in the Docker local directory, but the name is hard to remember

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The longest piece of code in the middle is the directory name, is how to generate not understand, anyway not remember

--volumes-from container Name
using this command, you can directly use the data volume container that has been generated, which is equivalent to the container specified by-V, which is the same as the newly generated container.
can simplify the command, save each boot container to use-V a long string, if it is multiple-V will be very messy to generate a data volume container will be much easier

use the Docker command to back up files in a container directory, or the entire directory
Docker Run
-rm Delete container, delete this container directly after backup
--volumes-from container name specifies which container to back up
- v Local: Container directory
Image Name
Tar cvf compression
/Container directory/name. tar/directories or files that need to be backed up
Complete Command Example

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restore is also simple, just need to change  CVF   to  XVF can   do not have to specify the directory reply, Directly select the backed up tar file to

docker rm-v      -V is to directly delete the data volume associated with the container, but requires that the data volume must not be occupied , you cannot delete the
using-V must be the case that data is completely unnecessary, otherwise losing data is a horrible thing

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linux-centos7-docker-container storage for permanent preservation