boot in 2761ms

notes.txt

- This run was on a c5.large which had been booted up before
- Set MODULES=dep in /etc/initramfs-tools/initramfs.conf
- Deleted a bunch of initramfs-tools hooks, including especially: iscsi mdadm lvm2
- Removed a bunch of stock ubuntu services
  * snapd
  * ec2-instance-connect
  * cryptsetup-initramfs
  * udisks2
  * unattended-upgrades
  * plymouth
  * cloud-init
  * ntfs-3g
- cloud-init will probably need to be reinstalled: too useful
  * but I think it's still ok to `systemctl mask cloud-init-local`

plot.svg

various config

# ls -l /efi/vmlinuz.efi /efi/initrd.img 
-rwx------ 1 root root  9740071 Jul 13 11:02 /efi/initrd.img
-rwx------ 1 root root 14792416 Jul 13 07:59 /efi/vmlinuz.efi

# cat /efi/loader/entries/ubuntu.conf
title   Ubuntu 21.04
linux   /vmlinuz.efi
initrd  /initrd.img
options root=LABEL=rootfs rw console=ttyS0

# sfdisk -d /dev/nvme0n1
label: gpt
label-id: 66A473BB-60DA-4E91-AE02-A3E453008407
device: /dev/nvme0n1
unit: sectors
first-lba: 34
last-lba: 16777182
sector-size: 512

/dev/nvme0n1p1 : start=        2048, size=     1046529, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, uuid=962B618E-8B0D-4D4E-ADA3-B358774F21E5, name="EFI system partition"
/dev/nvme0n1p2 : start=     1050624, size=    15726559, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, uuid=9FC088B3-4BB7-444B-8FB1-1DA55C3D39AD, name="Linux filesystem"

# ls -l /dev/disk/by-label/
total 0
lrwxrwxrwx 1 root root 15 Jul 13 11:29 EFI -> ../../nvme0n1p1
lrwxrwxrwx 1 root root 15 Jul 13 11:26 rootfs -> ../../nvme0n1p2

# systemd --version
systemd 247 (247.3-3ubuntu3.1)
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +ZSTD +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=hybrid

# uname -a
Linux ip-172-31-61-134 5.11.0-1011-aws #11-Ubuntu SMP Thu Jun 17 01:42:24 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux