CODEWITHSUNDEEP
dockerdockerfile
Ganesh Satpute
Ganesh Satpute

Reputation: 3951

Docker: Mount directory from one container to another

I have two docker images. One of the docker image (from first container), when ran, generates some files, which needs to be consumed by the another container.

Can I do this?

Upvotes: 41

Views: 46984

Answers (4)

Ky Nguyen
Ky Nguyen

Reputation: 45

For me, I just use the --volumes-from to mount 2 or more volumes from one container to one another Dockerfile1

FROM alpine:3.7

MAINTAINER john "[email protected]"

ENV REFRESHED_AT=2021-02-01 \

VOLUME ["/mount1", "/mount2"]

CMD ["tail", "-f", "/dev/null"]

EXPOSE 80

Dockerfile2

FROM ubuntu:16.04

MAINTAINER john "[email protected]"

ENV REFRESHED_AT=2021-02-01 \

VOLUME ["/mount1", "/mount2"]

CMD ["tail", "-f", "/dev/null"]

EXPOSE 80

You build 2 of them, then you create the first container by creating a folder in or outside the Dockerfile. For the second container, you just need to issue this attribute --volumes-from <first container>. This method means that the second container will mount 2 mountpoint from the first container to the second container.

Upvotes: 0

Wolfgang Fahl
Wolfgang Fahl

Reputation: 15604

Oracle had a an example on their website in 2015 (which is not available any more). Based on this i created

https://github.com/BITPlan/docker-stackoverflowanswers/tree/master/33232991

Dockerfile.data

# Dockerfile that modifies ubuntu to create a data volume container
FROM ubuntu:14.04
RUN mkdir -p /var/www/html
RUN echo "This is the content for file1.html" > /var/www/html/file1.html
RUN echo "This is the content for file2.html" > /var/www/html/file2.html
RUN echo "This is the content for index.html" > /var/www/html/index.html
VOLUME /var/www/html
ENTRYPOINT /usr/bin/tail -f /dev/null

for the data image and

Dockerfile

# Ubuntu image
FROM ubuntu:14.04

for the image to test the use of the other data only volume.

docker build -t bitplan/dataonly:0.0.1 -f Dockerfile.data . 
docker build -t bitplan/dataexample:0.0.1 .

builds these images

and they both show in my images list now:

docker images | grep data

wf@mars:~/source/docker/stackoverflow2>    docker images | grep data
bitplan/dataonly          0.0.1               aa6aeb923f55        9 minutes ago       188.4 MB
bitplan/dataexample       0.0.1               a005e6b7dd01        7 days ago          188.4 MB

running and testing is done with

docker run -d --name html bitplan/dataonly:0.0.1
docker run --volumes-from html bitplan/dataexample:0.0.1 ls /var/www/html

which shows:

0ebb78f209169fb7d281bb6b06851b33af7a98488c3a38cf25ac92fe983fff43
file1.html
file2.html
index.html

Upvotes: 18

Manuel J. Garrido
Manuel J. Garrido

Reputation: 2414

Rene's answer works, but you could share data without using the host's directory (container1 ==> container2):

docker run -v /data/myfolder --name container1 image-name-1
docker run --volumes-from container1 image-name-2

Upvotes: 31

Rene M.
Rene M.

Reputation: 2690

It's very simple. You have to share one directory to two different containers, then have both access to the same data in that directory.

docker run -v myfolder:/data/myfolder image-name-1
docker run -v myfolder:/data/myfolder image-name-2

Upvotes: 9

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