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apt install dropbear-initramfs
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/etc/dropbear-initramfs/config
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DROPBEAR_OPTIONS="-p611 -s -j -k -I 60"
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# Add RSA keys here (no ed25519 ?)
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vim /etc/dropbear-initramfs/authorized_keys
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# update initramfs
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update-initramfs -u
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# Set up grub
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vim /etc/default/grub
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# Like:
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GRUB_CMDLINE_LINUX_DEFAULT="ip=client-ip::gw-ip:netmask"
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# Example:
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GRUB_CMDLINE_LINUX_DEFAULT="ip=10.1.1.100::10.1.1.1:255.255.255.0"
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# (Also maybe add numa=off)
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# update grub
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update-grub
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# Set up ~/.ssh/config for client to connect to dropbear/ssh:
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Host sf-001-disk
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Hostname 10.1.1.100
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Port 611
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User root
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PasswordAuthentication no
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IdentityFile ~/.ssh/id_rsa
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# Then when system boots up, ssh to it:
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ssh sf-001-disk
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# When logged in, run:
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cryptroot-unlock
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