Jenkins puts lots of temporary data (that's not part of the actual state, but automatically created) into the jenkins_home volume, by uncompressing the war there.
This unnecessarily bloats up the jenkins_home volume (about 200MB!), which is very unpleasant when running many instances and for backups.
I see several options for solving that problem:
- dont uncompress it at all
- mount it via fuse-zip
- uncompress to some tmpfs
- uncompress to an extra volume (which can be easily disposed)