On 3/17/21 12:34 AM, Nico Schottelius wrote:
On 2021-03-16 22:06, Stefan Kooman wrote:
On 3/16/21 6:37 PM, Stephen Smith6 wrote:
Hey folks - thought I'd check and see if anyone has ever tried to use
ephemeral (tmpfs / ramfs based) boot disks for Ceph nodes?
croit.io does that quite succesfully I believe [1].
Same here at ungleich, all our ceph nodes with the exception of the
monitors are PXE booted. And as a matter of fact, 90% of them even
netboot via IPv6 only using ipxe.
Nice, all our Ceph server are 100% installed through iPXE over IPv6, but
not (i)PXE booted.
Modern BIOSes (UEFI) might allow for directly booting from http(s) (also
possible with iPXE). Especially Tianocore (EDK2) for arm64 allows you to
do that. Then you just need a webserver where you can apply logic what
image should be downloaded by a client. And indeed a mechanism to get a
ceph.conf on your hosts, or use DNS magic to accomplish that [1]. Do
take in mind that the less state there is on the Ceph hosts themselves,
the more you rely on external systems to properly boot / configure your
cluster. Carefully think about chicken / egg problems when (certain)
parts of that infrastructure are unavailable.
Gr. Stefan
[1]: https://docs.ceph.com/en/latest/rados/configuration/mon-lookup-dns/
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