On 14/05/18 21:53, Michael Di Domenico wrote:
Can you expand on "image stored on lustre" part? I'm pretty sure i understand the gist, but i'd like to know more.
I didn't set this part of the system up, but we have a local chroot on the management nodes disk that we add/modify/remove things from and then when we're happy we have a script that will sync that out to the master copy on a Lustre filesystem. The compute nodes boot a RHEL7 kernel with custom initrd, that includes the necessary OPA and Lustre kernel modules & config to get the networking working and access the Lustre filesystem, the kernel then pivots its root filesystem from the initrd to the master copy on Lustre via overlayfs2 to ensure the compute node sees it as read/write but without the possibility of it modifying the master (as the master is read-only in overlayfs2). It's more complicated than that, but that's the gist.. Does that help? All the best! Chris -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
