Public bug reported:
Currently, open-iscsi ships a /lib/modules-load.d/open-iscsi.conf which
hard-codes the iscsi_tcp and ib_iser modules. However, we ship open-
iscsi as part of the standard ubuntu-server seed, but not all images
that derive from this seed have kernels that include the ib_iser module.
In particular, we've noticed that the Raspberry Pi kernel does not.
This is noticeable because if a module doesn't exist, the systemd-
modules-load service fails, and leaves the system boot in a degraded
mode per systemd.
And unfortunately ib_iser has no modaliases, so it's not as if this is
something that can be switched to udev autoloading.
Options for resolving this:
- get the kernel team to set CONFIG_INFINIBAND_ISER=m on all kernels. But
this would increase kernel memory consumption unconditionally on possibly
memory-constrained arm systems, for no real value. (A spot check on another
arch shows roughly 750K; not huge but not nothing)
- drop ib_iser from debian/open-iscsi.kmod (why does use of iscsi dictate
loading a particular infiniband module? there's nothing in the debian/changelog
that explains)
- vary the contents of /lib/modules-load.d/open-iscsi.conf (only sensible if
we believe that this module would never be useful on any armhf)
- remove open-iscsi from the server seed; historically, this is blocked by
older versions of MAAS depending on mounting ephemeral images via iscsi, but
perhaps the depends on open-iscsi could be made architecture-dependent, if only
armhf is affected by this problem and MAAS doesn't support any armhf targets?
This needs input from the Server Team.
** Affects: open-iscsi (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1833586
Title:
open-iscsi unconditionally requires ib_iser module which is not built
on all Ubuntu kernels
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