Share and update docker data containers across containers -

i have following containers:

• data container build directly in quay.io github repo, website.
• fpm container
• nginx container

the 3 of them linked , working fine. problem every time change in website (data container) rebuilt (of course) , have remove container , fpm , nginx , recreate them able read new content.

i started "backup approach" i'm copying data container host directory , mounting fpm , nginx containers, way can update data without restarting/removing service.

but idea of moving data data container host, doesn't me. wondering if there "docker way" or better way of doing it.

thanks!

update: adding more context

dockerfile d`ata container definition

from debian  add data/* /home/mustela/  volume /home/mustela/ 

where data has 2 files: hello.1 , hello.2

compiling image:

docker build -t="mustela/data" .

running data container:

docker run --name mustela-data mustela/data

creating container link previous one:

docker run -d -it --name nginx --volumes-from mustela-data ubuntu bash

listing mounted files:

docker exec -it nginx ls /mustela/home

result:

hello.1 hello.2

now, lets rebuild data container image, first adding new files, inside data have hello.1 hello.2 hello.3 hello.4

docker rm mustela-data docker build -t="mustela/data" . docker run --name mustela-data mustela/data 

if ls /home/mustela running container, files aren't being updated:

docker exec -it nginx ls /mustela/home

result:

hello.1 hello.2

but if run new container can see files

docker run -it --name nginx2 --volumes-from mustela-data ubuntu ls /home/mustela

result: hello.1 hello.2 hello.3 hello.4