On 2005-02-02 18:12 -0500, Edward Faulkner wrote: > On Wed, 2 Feb 2005 16:24:49 -0600, Christopher S. Aker <[EMAIL PROTECTED]> > > "Sharing Filesystems between Virtual Machines" > > http://user-mode-linux.sourceforge.net/shared_fs.html > > COW is great if you want each UML to have it's own independent > filesystem, based on the same image. But it sounds like Andre wants a > shared filesystem in which each machine can see each other's changes, > in an NFS-like way. > > Hostfs is probably the way to do this, but I can't vouch for its > security. I'm curious myself.
Exactly. I know what COW files are and I use them, but this is not the problem I'm trying to solve. I have UMLs that need read/write access to a relatively large amount of on-disk data (tens of GB). The volume of shared data is small compared to the volume of non-shared data. COW is designed for the opposite situation. I could create one 50 GB file for each UML and use it as a ubd but that's bound to fail as I don't know in advance how much disk space a given UML will need. I'd rather have one big FS and have all UMLs share it. If I did this with physical machines, I might set up a large filesystem on a server and have all the machines mount it over NFS. There are so many inherent security risks with NFS, however, that I fear that it would nearly negate the security advantages of using UMLs. AFS, Coda and Intermezzo are possible alternatives but they have other drawbacks. I'd like to know how hostfs compares, especially with regards to security (i.e. how hard is it to use hostfs to break into the host). -- Andr� Majorel <URL:http://www.teaser.fr/~amajorel/> Do not use this account for regular correspondence. See the URL above for contact information. ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ User-mode-linux-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
