Jie Yu created MESOS-5776:
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Summary: Add CVMFS provisioner store.
Key: MESOS-5776
URL: https://issues.apache.org/jira/browse/MESOS-5776
Project: Mesos
Issue Type: Task
Reporter: Jie Yu
The goal is to implement this interface:
{code}
Future<ImageInfo> get(const Image& image);
{code}
Where `ImageInfo` contains a vector of image layers which will be used by
provisioner to assemble the rootfs for the container. For CVMFS, we have to use
a mount based backend to fully leverage the on-demand fetching capability.
However, it's unclear if CVMFS fuse driver is compatible with overlayfs (or
aufs), we should assume a bind backend. Because of that, the `get` function
above should only return one layer. Also, the provisioned rootfs will be
readonly. In the future, if we found that CVMFS fuse driver is compatible with
overlay filesystems, we can relax this restriction (the rootfs can be writable).
Another tricky thing is that we need to make sure CVMFS is mounted properly.
CVMFS leverage autofs to do auto mounting and will unmount if it detects no
activity. We should either document how CVMFS should be configured, or use some
way in the code to address that.
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