If i have inside my localhost a log folder at:
/var /logs apache.logs elasticsearch.logs etc... And i want to mount /var/logs directory of my host, into a path inside a Docker container, like /usr/var/logs/ , how do i do that within a dockerfile ? So each time a log file is updated, it would be accessible within the container too. Thank you
You can not mount a volumn in Dockerfile
Because:
Dockerfile will build an image, image is independent on each machine host.
Image should be run everywhere on the same platform for example on linux platform it can be running on fedora, centos, ubuntu, redhat...etc
So you just mount volumn in to the container only. because container will be run on specify machine host.
Hope you understand it. Sorry for my bad English.
You can achieve it in two ways - https://docs.docker.com/storage/bind-mounts/
$ docker run -d -it --name devtest --mount type=bind,source=/var/logs,target=/usr/var/logs image:tag $ docker run -d -it --name devtest -v /var/logs:/usr/var/logs image:tag Try -v option of docker run command.
docker run -itd -v /var/logs:/usr/var/logs image-name
This will mount /var/logs directory of host on to /usr/var/logs directory of container.
Hope this helps.
Update:
To mount directory with source and dest in dockerfile make use of this hack (Not 100% sure though).
RUN --mount=target=/usr/var/logs,type=bind,source=/var/logs 
VOLUME option in dockerfile might help, but there you can't provide source directory on host. Just try this hack mentioned in this answer. stackoverflow.com/questions/26050899/…