Add initial configuration for Google Compute Engine
This commit is contained in:
Rob Vermaas
parent
f74ca42ba6
commit
f7b256a221
5
nixos/modules/virtualisation/google-compute-config.nix
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5
nixos/modules/virtualisation/google-compute-config.nix
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{ config, pkgs, modulesPath, ... }:
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{
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imports = [ "${modulesPath}/virtualisation/google-compute-image.nix" ];
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}
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158
nixos/modules/virtualisation/google-compute-image.nix
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158
nixos/modules/virtualisation/google-compute-image.nix
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{ config, pkgs, ... }:
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with pkgs.lib;
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{
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imports = [ ../profiles/headless.nix ../profiles/qemu-guest.nix ];
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system.build.googleComputeImage =
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pkgs.vmTools.runInLinuxVM (
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pkgs.runCommand "google-compute-image"
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{ preVM =
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''
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mkdir $out
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diskImage=$out/disk.raw
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truncate $diskImage --size 10G
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mv closure xchg/
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'';
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postVM =
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''
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PATH=$PATH:${pkgs.gnutar}/bin:${pkgs.gzip}/bin
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pushd $out
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tar -Szcf disk.raw.tar.gz disk.raw
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rm $out/disk.raw
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popd
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'';
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buildInputs = [ pkgs.utillinux pkgs.perl ];
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exportReferencesGraph =
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[ "closure" config.system.build.toplevel ];
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}
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''
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# Create partition table
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${pkgs.parted}/sbin/parted /dev/vda mklabel msdos
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${pkgs.parted}/sbin/parted /dev/vda mkpart primary ext4 1 10G
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${pkgs.parted}/sbin/parted /dev/vda print
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. /sys/class/block/vda1/uevent
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mknod /dev/vda1 b $MAJOR $MINOR
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# Create an empty filesystem and mount it.
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${pkgs.e2fsprogs}/sbin/mkfs.ext4 -L nixos /dev/vda1
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${pkgs.e2fsprogs}/sbin/tune2fs -c 0 -i 0 /dev/vda1
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mkdir /mnt
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mount /dev/vda1 /mnt
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# The initrd expects these directories to exist.
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mkdir /mnt/dev /mnt/proc /mnt/sys
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mount --bind /proc /mnt/proc
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mount --bind /dev /mnt/dev
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mount --bind /sys /mnt/sys
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# Copy all paths in the closure to the filesystem.
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storePaths=$(perl ${pkgs.pathsFromGraph} /tmp/xchg/closure)
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mkdir -p /mnt/nix/store
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echo "copying everything (will take a while)..."
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cp -prd $storePaths /mnt/nix/store/
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# Register the paths in the Nix database.
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printRegistration=1 perl ${pkgs.pathsFromGraph} /tmp/xchg/closure | \
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chroot /mnt ${config.nix.package}/bin/nix-store --load-db
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# Create the system profile to allow nixos-rebuild to work.
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chroot /mnt ${config.nix.package}/bin/nix-env \
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-p /nix/var/nix/profiles/system --set ${config.system.build.toplevel}
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# `nixos-rebuild' requires an /etc/NIXOS.
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mkdir -p /mnt/etc
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touch /mnt/etc/NIXOS
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# `switch-to-configuration' requires a /bin/sh
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mkdir -p /mnt/bin
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ln -s ${config.system.build.binsh}/bin/sh /mnt/bin/sh
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# Install a configuration.nix.
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mkdir -p /mnt/etc/nixos /mnt/boot/grub
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cp ${./google-compute-config.nix} /mnt/etc/nixos/configuration.nix
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# Generate the GRUB menu.
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ln -s vda /dev/sda
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chroot /mnt ${config.system.build.toplevel}/bin/switch-to-configuration boot
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umount /mnt/proc /mnt/dev /mnt/sys
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umount /mnt
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''
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);
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fileSystems."/".label = "nixos";
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boot.kernelParams = [ "console=ttyS0" "panic=1" "boot.panic_on_fail" ];
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boot.initrd.kernelModules = [ "virtio_scsi" ];
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# Generate a GRUB menu. Amazon's pv-grub uses this to boot our kernel/initrd.
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boot.loader.grub.device = "/dev/sda";
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boot.loader.grub.timeout = 0;
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# Don't put old configurations in the GRUB menu. The user has no
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# way to select them anyway.
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boot.loader.grub.configurationLimit = 0;
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# Allow root logins only using the SSH key that the user specified
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# at instance creation time.
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services.openssh.enable = true;
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services.openssh.permitRootLogin = "without-password";
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# Force getting the hostname from Google Compute.
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networking.hostName = mkDefault "";
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# Always include cryptsetup so that NixOps can use it.
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environment.systemPackages = [ pkgs.cryptsetup ];
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# Prevent logging in as root without a password. This doesn't really matter,
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# since the only PAM services that allow logging in with a null
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# password are local ones that are inaccessible on Google Compute machines.
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security.initialRootPassword = "!";
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# Configure default metadata hostnames
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networking.extraHosts = ''
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169.254.169.254 metadata.google.internal metadata
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'';
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users.extraUsers.root.openssh.authorizedKeys.keys = ["ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCt9GBbtWUTDacovm2O6qDw/SsmUmwYBu3k+6kx8/Xv7IJK5uqxhNTBc0MfADBV6EMZVDkaw+rDeRvcDuEzz2r/CP/x1vVDiwWYjyU2uOZEHFKh15W/1qC9fwBIikcbgm+8R33kmpFr9AChP4KWR+4T3jf0AYknZ3pbZ5GPCTWmWeOR4PVhtusDt0/cfWrENrA0mFo37xohn5lFsbrJ5/rMuhWglTuHIQFGwECqbYPvyxDLZxAfqg1Wc1AJAW8xRuJafvPyuxsj+qJu+MfKpAcxSoXDtldPxCFF6e/4j0Ey/kz435fJS/AjSJwmeurOQ/vB+tm2Db1wLWc1669S46Kl rbvermaa@propowerrrr"];
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# fetch authorized keys for root user
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systemd.services.fetch-root-authorized-keys =
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{ description = "Fetch authorized_keys for root user.";
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wantedBy = [ "multi-user.target" ];
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before = [ "sshd.service" ];
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after = [ "network.target" ];
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path = [ pkgs.curl ];
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script =
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''
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# Don't download the SSH key if it has already been downloaded
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if ! [ -e /root/.ssh/authorized_keys ]; then
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echo "obtaining SSH key..."
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mkdir -p /root/.ssh
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curl -o /root/authorized-keys-metadata http://metadata/0.1/meta-data/authorized-keys
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if [ $? -eq 0 -a -e /root/authorized-keys-metadata ]; then
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cat /root/authorized-keys-metadata | cut -d: -f2- > /root/key.pub
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if ! grep -q -f /root/key.pub /root/.ssh/authorized_keys; then
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cat /root/key.pub >> /root/.ssh/authorized_keys
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echo "new key added to authorized_keys"
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fi
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chmod 600 /root/.ssh/authorized_keys
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rm -f /root/key.pub /root/authorized-keys-metadata
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fi
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fi
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'';
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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};
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}
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