Hi, the following patches add a new command line option "rbdboot" that contains all necessary information to connect to a Ceph cluster, mount a RBD image and boot from it.
The RBD image is mounted via the kernel RBD client (rbd.ko) which does not require any special user-space binary. The typical initramfs in Debian with the "most modules" configuration already contains all necessary kernel modules: rbd, aes, and cbc scripts/rbd uses /sys/bus/rbd/add [1] instead of the user-space binary "rbd" to communicate with the kernel. One difference from the NFS boot feature is that NFS allows configuration via initramfs.conf which we did not implement. The reason for this is that we cannot think of any scenario were it would make sense to configure the Ceph connection statically in the initramfs. You need a network connection anyways, so you can pass this information via the command line or dhcp... Paul Emmerich First Colo GmbH [1] https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-bus-rbd Paul Emmerich (2): add support to boot directly from Ceph RBD images man pages: document rbdroot option hook-functions | 4 +- init | 3 + initramfs-tools.8 | 9 +++ scripts/rbd | 178 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 193 insertions(+), 1 deletion(-) create mode 100644 scripts/rbd -- 2.2.1 -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: https://lists.debian.org/[email protected]
