CODEWITHSUNDEEP
dockerdockerfile
trivelt
trivelt

Reputation: 1965

How to remove data from docker volume?

I prepared Docker image containing libraries needed for building my other project. I want to have a directory /myLibs with libraries from different projects, e.g:

/myLibs:

Dockerfile:

FROM my-base:1.0
VOLUME /myLibs
COPY projectA/bin/*.so* /myLibs/projectA/bin/
CMD /bin/bash

Built:

docker build -t my-libs:1.0 .

Then I want to update libs in this image every time when I rebuild projectA. So I prepared Dockerfile:

FROM my-libs:1.0  # I changed parent image, because /myLibs/projectB and /myLibs/projectC should remain
VOLUME /myLibs
RUN ls -al /myLibs && rm -rf /myLibs/projectA && ls -al /myLibs
RUN ls -al /myLibs
COPY projectA/bin/*.so* /myLibs/projectA/bin/
CMD /bin/bash

As a result I have old projectA libs in my volume:

Step 4 : RUN ls -al /myLibs && rm -rf /myLibs/projectA && ls -al /myLibs
 ---> Running in 1e3e25084e69
total 12
drwxr-xr-x  3 root root 4096 Jul 16 13:52 .
drwxr-xr-x 75 root root 4096 Jul 16 13:52 ..
drwxr-xr-x  4 root root 4096 Jul 16 13:51 projectA
total 8
drwxr-xr-x  2 root root 4096 Jul 16 13:52 .
drwxr-xr-x 75 root root 4096 Jul 16 13:52 ..
 ---> d5973da5965c
Removing intermediate container 1e3e25084e69
Step 5 : RUN ls -al /myLibs
 ---> Running in 1d93575b50c2
total 12
drwxr-xr-x  3 root root 4096 Jul 16 13:52 .
drwxr-xr-x 75 root root 4096 Jul 16 13:52 ..
drwxr-xr-x  4 root root 4096 Jul 16 13:51 projectA
---> 6d2a48a5b67b

How can I remove files from volume?

Upvotes: 3

Views: 1126

Answers (1)

ldg
ldg

Reputation: 9402

If you want to change the files on rebuild, you probably don't want to do it in the volume. The volume is generally for data you want to persist. Remember the volume mounting will occur after the container builds, so what's probably happening is the volume with the old data is mounting over any changes you are making in the image (re)build.

What are you using /myLibs for? If they are read-only files you want to set up in the build, you might be better off not using a volume and make them part of the image. If you want to modify them, it's probably better to manage that after the build - there is no real reason to rebuild the image if you are just changing files in a networked volume.

Upvotes: 2

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