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image: add IMDS support in initrd - #320
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This makes built images work in cloud environments for passing credentials/configuration via IMDS, and keeps initrds consistent between all output formats. systemd's IMDS generator enables the imds and networkd units only on a hwdb-matched cloud, so there is no runtime impact in other environments. It still grows the disk footprint by a bit, measurements for the uncompressed boot-demo initrd: Fedora: 93.5 MB → 101.4 MB (+8.5%) Debian: 103.2 MB → 111.7 MB (+8.2%) Arch: unchanged, its systemd already ships both Signed-off-by: Martin Pitt <martin@amutable.com>
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I think this is OK, networking is basic enough that we should just add it to the initrd by default.
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@daandemeyer one more commit coming, I'm just running CI in between to get the arm64 checksums |
Necessary for IMDS/networkd to reach the service on AWS. It adds 90 KB to the boot-demo UKI. Clouds with `virtio_net` are covered already (Hetzner, Oracle VMs, Scaleway, Tencent, Alibaba and Vultr). Azure and GCP's gVNIC types need other drivers. We'll add them later when tine can build images for them. Signed-off-by: Martin Pitt <martin@amutable.com>
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@daandemeyer third commit (udev rule) is in now. Still needs one more round of arm64 checksums, but that's trivial. |
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EBS volumes are NVMe devices whose I/O can stall for longer than the kernel's 30 s timeout, which then fails the root file system. AWS recommends `nvme_core.io_timeout` on the kernel command line, but that also changes the timeout of every NVMe disk on real hardware. So ship the udev rule of `amazon-ec2-utils` instead, which matches only EBS volumes. Signed-off-by: Martin Pitt <martin@amutable.com>
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This makes built images work in cloud environments for passing credentials/configuration via IMDS, and keeps initrds consistent between all output formats.
systemd's IMDS generator enables the imds and networkd units only on a hwdb-matched cloud, so there is no runtime impact in other environments. It still grows the disk footprint by a bit, measurements for the uncompressed boot-demo initrd:
Fedora: 93.5 MB → 101.4 MB (+8.5%)
Debian: 103.2 MB → 111.7 MB (+8.2%)
Arch: unchanged, its systemd already ships both