Runtime error on Alpine Linux

[centromere]

When building and running from the alpine:latest Docker image, the following error occurs:

zpool_latency_vdev_scrub_histo_seconds_bucket{name="tank",vdev="root",le="+Inf"} 14168517
zpool_latency_vdev_scrub_histo_seconds_sum{name="tank",vdev="root"} 0
zpool_latency_vdev_scrub_histo_seconds_count{name="tank",vdev="root"} 14168517
error: can't get vdev_trim_histo

I do not have any SSDs attached to this machine, so perhaps that's why it isn't working. When I remove the TRIM-related lines, the application runs to completion.

[richardelling]

This can happen if the runtime ZFS kernel module does not match the compiled header files.
Can you share the version of the ZFS kernel module: modinfo zfs | grep version ?

[centromere]

version:        0.7.5-1ubuntu16.8
srcversion:     A3222A8FEA8707E8E568D80

[richardelling]

ok, trim support appears in ZFS version 0.8.0. So the binary must have been compiled in a
version 0.8.x or later system.

Ideally, the runtime is the same version of ZFS as compile time. If they are not the same,
then it is possible to cause zpool_prometheus to break for other incompatibility reasons.

That said, I think we can be a little bit smarter about backwards compatibility. I'll take a look
at it this week. Either way, there will need to be a recompilation of zpool_prometheus for
your container.

Long term, I plan to contribute zpool_prometheus into the OpenZFS mainline. Once that
happens there will always be a zpool_prometheus compiled to match the corresponding
ZFS kernel module.