导出和导入docker数据容器

Question

I am new to docker and I have a problem when it comes to shipping data containers. Ok, usually we ship images and users can start as may containers from this image as the want, right?

Now I want to ship some data too - so I have made a data container so:

docker create -v /dbdata --name dbdata phusion/baseimage

Next I simply started a bash and inserted some data into my data container

docker run --volumes-from dbdata -i -t phusion/baseimage /bin/bash
echo "foo" > /dbdata/bar.txt
exit

Now I want to allow my team members to use the same data (offline), so I would like to "send" my data container to them. Therefore I have used

docker export dbdata > /tmp/cool_data.tar

But when I re import this with

cat /tmp/data.tar | sudo docker import - dbdata2

I can not use this "container" because it seems to be an image

docker run --volumes-from dbdata2 -i -t phusion/baseimage /bin/bash
FATA[0000] Error response from daemon: Container dbdata2 not found. Impossible to mount its volumes 

How do I export and import data containers correctly?

Answer 1

You need to make a container out of this image first. Run this:

docker create -v /dbdata --name dbdata2 dbdata2

For more details, check out Creating and mounting Data Volume Containers

Answer 2

You can't export and import data in volumes like this - volumes are simply not included in export/import.

You don't need to do this however - just zip or tar the directories the volumes are mapped to and send to your colleagues. They can then make their own data containers using those files.

You may also want to look at flocker , which can help you migrate containers and data.

Answer 3

I'm having good luck with the following Dockerfile:

from scratch

ADD install_theGreatSoftwarePkg /install
VOLUME /install

Then I do a build and create:

docker build -t greatSoftwareInstallImage .
docker create -t --name=greatSoftwareMedia greatSoftwareInstallImage /bin/true