The best way to share volume with config data between multiple Docker containers
One could use read-only volumes. 


docker run -d \
  -it \
  --name=nginxtest \
  -v nginx-vol:/usr/share/nginx/html:ro \
  nginx:latest



If one would like to use the same volume in multiple containers then one could specify the following when running each container:

-v vol:/usr/share/nginx/html:ro


Note: one could use ro to ensure that the volume is read-only to prevent that multiple containers will write at the same time to the same volume and prevent issues.