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Enable local persistent storage

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Machine-specific data, such as SSH keys, should not be included in the
immutable root filesystem image, as this would prevent multiple machines
running from the same image.  These few files can be stored locally, on
the SD card on eMMC flash.

The first time a machine boots up using this image, its local storage is
initialized.  This involves creating a new filesystem on the block
device and generating SSH host keys.  Once the storage is initialized,
it is remounted read-only.  All subsequent mounts are read-only as well.
This commit is contained in:
Dustin
2022-04-04 20:53:10 -05:00
parent 14d0cdcec1
commit 2a0737ab78
5 changed files with 60 additions and 4 deletions
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overlay/etc/fstab
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@@ -2,4 +2,6 @@ tmpfs /var/lib/rsyslog tmpfs defaults 0 0
tmpfs /var/log tmpfs defaults 0 0
tmpfs /var/lib/systemd tmpfs defaults 0 0
tmpfs /var/lib/NetworkManager tmpfs defaults 0 0
/dev/mmcblk0 /run/storage ext4 ro,noexec,nosuid,nodev,x-systemd.makefs 0 2
overlay /etc/ssh overlay ro,lowerdir=/etc/ssh:/run/storage/ssh,noexec,nodev,nosuid,x-systemd.requires-mounts-for=/run/storage 0 0
/dev/nbd1 swap swap noauto,x-systemd.makefs 0 0