问题
I have 2 docker containers running on my system.
I wanted to copy the data from one container to another container from my host system itself.
i know that to copy data from container to host we have to use
docker cp <Source path> <container Id>:path in container
Now i am trying to copy the data directly from one container to another, is there any way to do that ??
i tried doing this.
docker cp <container-1>:/usr/local/nginx/vishnu/vishtest.txt <container-2>:/home/smadmin/vishnusource/
but the above command failed saying its not supported.
i should not copy the data to my local machine, thats my requirement.
anybody have an idea to do this, thanks in advance ?
回答1:
You should use volume for that.
First, create a volume:
docker volume create --name shared
Then, run containers like this:
docker run -v shared:/shared-folder <container-1>
docker run -v shared:/shared-folder <container-2>
This way, /shared-folder will be synced between these two containers.
Read more about it here
Hope it helps
回答2:
The docker cp command only works between a container and the host, not between two containers. To use that, you'd need to have a copy on the host.
The ideal solution if the two containers should remain in sync is to store the data inside a volume:
docker run --name container-1 -v vishnu-source:/usr/local/nginx/vishnu/ ...
docker run --name container-2 -v vishnu-source:/home/smadmin/vishnusource/ ...
You can also abuse pipes and docker exec to move files between the two if both containers include tar (you can change the . in the first command to vishtest.txt to only copy that one file):
docker exec container-1 tar -cC /usr/local/nginx/vishnu . \
| docker exec -i container-2 tar -xC /home/smadmin/vishnusource/
回答3:
This is what I use to copy folders between dockers using a single command:
docker exec container-1 tar -c -f- folder/path/from/root | \
docker exec -i container-2 tar -x -f-
来源：https://stackoverflow.com/questions/44119507/copying-data-from-and-to-docker-containers