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cloud-init: stop persisting zram swap into /etc/fstab (slow cloud boot) #10324

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cloud-init: stop persisting zram swap into /etc/fstab (slow cloud boot) #10324

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16 changes: 16 additions & 0 deletions extensions/cloud-init/config/99-armbian-no-zram-swap.cfg
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Original file line number Diff line number Diff line change
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# Do not let cloud-init persist the (dynamic) zram swap into /etc/fstab.
#
# Armbian sets up zram swap at boot via armbian-zram-config.service. cloud-init's
# `mounts` module otherwise sees that active swap and writes a matching
# "/dev/zram0 none swap ... comment=cloudconfig" line to /etc/fstab. On the next
# boot systemd turns that line into a dev-zram0.swap unit and blocks ~90s on the
# device timeout waiting for /dev/zram0 — which only appears once
# armbian-zram-config runs — before swap.target fails/recovers. Result: a very
# slow boot every time.
#
# Setting the `swap` mount to null removes cloud-init's default swap mount, so it
# leaves zram/swap management to Armbian while keeping the rest of the `mounts`
# module intact. (cc_mounts sanitizes the config before de-duplicating, so this
# suppresses the auto-added default swap entry too.)
mounts:
- [ swap, null ]
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