nova-image: use wget instead of cloud-init (via EC2 API)
The Openstack metadata service exposes the EC2 API. We use the existing `ec2.nix` module to configure the hostname and ssh keys of an Openstack Instance. A test checks the ssh server is well configured. This is mainly to reduce the size of the image (700MB). Also, declarative features provided by cloud-init are not really useful since we would prefer to use our `configuration.nix` file instead.
This commit is contained in:
Antoine Eiche
parent
bf041c3f1d
commit
2858b35100
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@ -1,4 +1,4 @@
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{ lib, ... }:
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{ pkgs, lib, ... }:
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with lib;
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@ -6,6 +6,8 @@ with lib;
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imports = [
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../profiles/qemu-guest.nix
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../profiles/headless.nix
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# The Openstack Metadata service exposes data on an EC2 API also.
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./ec2-data.nix
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];
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config = {
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@ -26,35 +28,41 @@ with lib;
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passwordAuthentication = mkDefault false;
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};
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services.cloud-init.enable = true;
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systemd.services.nova-init = {
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path = [ pkgs.wget ];
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description = "Fetch Metadata on startup";
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wantedBy = [ "multi-user.target" ];
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before = [ "apply-ec2-data.service" ];
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wants = [ "network-online.target" ];
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after = [ "network-online.target" ];
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script =
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''
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metaDir=/etc/ec2-metadata
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mkdir -m 0755 -p "$metaDir"
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# Put /tmp and /var on /ephemeral0, which has a lot more space.
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# Unfortunately we can't do this with the `fileSystems' option
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# because it has no support for creating the source of a bind
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# mount. Also, "move" /nix to /ephemeral0 by layering a unionfs-fuse
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# mount on top of it so we have a lot more space for Nix operations.
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echo "getting Openstack instance metadata (via EC2 API)..."
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if ! [ -e "$metaDir/ami-manifest-path" ]; then
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wget --retry-connrefused -O "$metaDir/ami-manifest-path" http://169.254.169.254/1.0/meta-data/ami-manifest-path
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fi
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/*
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boot.initrd.postMountCommands =
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''
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mkdir -m 1777 -p $targetRoot/ephemeral0/tmp
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mkdir -m 1777 -p $targetRoot/tmp
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mount --bind $targetRoot/ephemeral0/tmp $targetRoot/tmp
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if ! [ -e "$metaDir/user-data" ]; then
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wget --retry-connrefused -O "$metaDir/user-data" http://169.254.169.254/1.0/user-data && chmod 600 "$metaDir/user-data"
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fi
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mkdir -m 755 -p $targetRoot/ephemeral0/var
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mkdir -m 755 -p $targetRoot/var
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mount --bind $targetRoot/ephemeral0/var $targetRoot/var
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if ! [ -e "$metaDir/hostname" ]; then
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wget --retry-connrefused -O "$metaDir/hostname" http://169.254.169.254/1.0/meta-data/hostname
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fi
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mkdir -p /unionfs-chroot/ro-nix
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mount --rbind $targetRoot/nix /unionfs-chroot/ro-nix
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mkdir -p /unionfs-chroot/rw-nix
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mkdir -m 755 -p $targetRoot/ephemeral0/nix
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mount --rbind $targetRoot/ephemeral0/nix /unionfs-chroot/rw-nix
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unionfs -o allow_other,cow,nonempty,chroot=/unionfs-chroot,max_files=32768 /rw-nix=RW:/ro-nix=RO $targetRoot/nix
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'';
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boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];
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*/
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if ! [ -e "$metaDir/public-keys-0-openssh-key" ]; then
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wget --retry-connrefused -O "$metaDir/public-keys-0-openssh-key" http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key
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fi
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'';
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restartIfChanged = false;
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unitConfig.X-StopOnRemoval = false;
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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};
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};
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}
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61
nixos/tests/common/ec2.nix
Normal file
61
nixos/tests/common/ec2.nix
Normal file
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@ -0,0 +1,61 @@
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{ pkgs, makeTest }:
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with pkgs.lib;
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{
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makeEc2Test = { name, image, userData, script, hostname ? "ec2-instance", sshPublicKey ? null }:
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let
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metaData = pkgs.stdenv.mkDerivation {
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name = "metadata";
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buildCommand = ''
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mkdir -p $out/1.0/meta-data
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ln -s ${pkgs.writeText "userData" userData} $out/1.0/user-data
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echo "${hostname}" > $out/1.0/meta-data/hostname
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echo "(unknown)" > $out/1.0/meta-data/ami-manifest-path
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'' + optionalString (sshPublicKey != null) ''
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mkdir -p $out/1.0/meta-data/public-keys/0
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ln -s ${pkgs.writeText "sshPublicKey" sshPublicKey} $out/1.0/meta-data/public-keys/0/openssh-key
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'';
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};
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in makeTest {
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name = "ec2-" + name;
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nodes = {};
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testScript =
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''
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my $imageDir = ($ENV{'TMPDIR'} // "/tmp") . "/vm-state-machine";
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mkdir $imageDir, 0700;
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my $diskImage = "$imageDir/machine.qcow2";
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system("qemu-img create -f qcow2 -o backing_file=${image}/nixos.qcow2 $diskImage") == 0 or die;
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system("qemu-img resize $diskImage 10G") == 0 or die;
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# Note: we use net=169.0.0.0/8 rather than
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# net=169.254.0.0/16 to prevent dhcpcd from getting horribly
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# confused. (It would get a DHCP lease in the 169.254.*
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# range, which it would then configure and prompty delete
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# again when it deletes link-local addresses.) Ideally we'd
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# turn off the DHCP server, but qemu does not have an option
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# to do that.
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my $startCommand = "qemu-kvm -m 768";
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$startCommand .= " -device virtio-net-pci,netdev=vlan0";
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$startCommand .= " -netdev 'user,id=vlan0,net=169.0.0.0/8,guestfwd=tcp:169.254.169.254:80-cmd:${pkgs.micro-httpd}/bin/micro_httpd ${metaData}'";
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$startCommand .= " -drive file=$diskImage,if=virtio,werror=report";
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$startCommand .= " \$QEMU_OPTS";
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my $machine = createMachine({ startCommand => $startCommand });
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${script}
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'';
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};
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snakeOilPrivateKey = ''
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-----BEGIN OPENSSH PRIVATE KEY-----
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b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
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QyNTUxOQAAACDEPmwZv5dDPrMUaq0dDP+6eBTTe+QNrz14KBEIdhHd1QAAAJDufJ4S7nye
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EgAAAAtzc2gtZWQyNTUxOQAAACDEPmwZv5dDPrMUaq0dDP+6eBTTe+QNrz14KBEIdhHd1Q
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AAAECgwbDlYATM5/jypuptb0GF/+zWZcJfoVIFBG3LQeRyGsQ+bBm/l0M+sxRqrR0M/7p4
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FNN75A2vPXgoEQh2Ed3VAAAADEVDMiB0ZXN0IGtleQE=
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-----END OPENSSH PRIVATE KEY-----
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'';
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snakeOilPublicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMQ+bBm/l0M+sxRqrR0M/7p4FNN75A2vPXgoEQh2Ed3V EC2 test key";
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}
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@ -6,6 +6,8 @@
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with import ../lib/testing.nix { inherit system pkgs; };
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with pkgs.lib;
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with import common/ec2.nix { inherit makeTest pkgs; };
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let
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image =
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(import ../lib/eval-config.nix {
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@ -39,65 +41,10 @@ let
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];
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}).config.system.build.amazonImage;
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makeEc2Test = { name, userData, script, hostname ? "ec2-instance", sshPublicKey ? null }:
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let
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metaData = pkgs.stdenv.mkDerivation {
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name = "metadata";
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buildCommand = ''
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mkdir -p $out/1.0/meta-data
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ln -s ${pkgs.writeText "userData" userData} $out/1.0/user-data
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echo "${hostname}" > $out/1.0/meta-data/hostname
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echo "(unknown)" > $out/1.0/meta-data/ami-manifest-path
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'' + optionalString (sshPublicKey != null) ''
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mkdir -p $out/1.0/meta-data/public-keys/0
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ln -s ${pkgs.writeText "sshPublicKey" sshPublicKey} $out/1.0/meta-data/public-keys/0/openssh-key
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'';
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};
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in makeTest {
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name = "ec2-" + name;
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nodes = {};
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testScript =
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''
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my $imageDir = ($ENV{'TMPDIR'} // "/tmp") . "/vm-state-machine";
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mkdir $imageDir, 0700;
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my $diskImage = "$imageDir/machine.qcow2";
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system("qemu-img create -f qcow2 -o backing_file=${image}/nixos.qcow2 $diskImage") == 0 or die;
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system("qemu-img resize $diskImage 10G") == 0 or die;
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# Note: we use net=169.0.0.0/8 rather than
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# net=169.254.0.0/16 to prevent dhcpcd from getting horribly
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# confused. (It would get a DHCP lease in the 169.254.*
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# range, which it would then configure and prompty delete
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# again when it deletes link-local addresses.) Ideally we'd
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# turn off the DHCP server, but qemu does not have an option
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# to do that.
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my $startCommand = "qemu-kvm -m 768";
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$startCommand .= " -device virtio-net-pci,netdev=vlan0";
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$startCommand .= " -netdev 'user,id=vlan0,net=169.0.0.0/8,guestfwd=tcp:169.254.169.254:80-cmd:${pkgs.micro-httpd}/bin/micro_httpd ${metaData}'";
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$startCommand .= " -drive file=$diskImage,if=virtio,werror=report";
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$startCommand .= " \$QEMU_OPTS";
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my $machine = createMachine({ startCommand => $startCommand });
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${script}
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'';
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};
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snakeOilPrivateKey = ''
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-----BEGIN OPENSSH PRIVATE KEY-----
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b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
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QyNTUxOQAAACDEPmwZv5dDPrMUaq0dDP+6eBTTe+QNrz14KBEIdhHd1QAAAJDufJ4S7nye
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EgAAAAtzc2gtZWQyNTUxOQAAACDEPmwZv5dDPrMUaq0dDP+6eBTTe+QNrz14KBEIdhHd1Q
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AAAECgwbDlYATM5/jypuptb0GF/+zWZcJfoVIFBG3LQeRyGsQ+bBm/l0M+sxRqrR0M/7p4
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FNN75A2vPXgoEQh2Ed3VAAAADEVDMiB0ZXN0IGtleQE=
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-----END OPENSSH PRIVATE KEY-----
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'';
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snakeOilPublicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMQ+bBm/l0M+sxRqrR0M/7p4FNN75A2vPXgoEQh2Ed3V EC2 test key";
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in {
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boot-ec2-nixops = makeEc2Test {
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name = "nixops-userdata";
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inherit image;
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sshPublicKey = snakeOilPublicKey; # That's right folks! My user's key is also the host key!
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userData = ''
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@ -142,6 +89,7 @@ in {
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boot-ec2-config = makeEc2Test {
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name = "config-userdata";
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inherit image;
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sshPublicKey = snakeOilPublicKey;
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# ### http://nixos.org/channels/nixos-unstable nixos
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60
nixos/tests/nova-image.nix
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60
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@ -0,0 +1,60 @@
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{ system ? builtins.currentSystem,
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config ? {},
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pkgs ? import ../.. { inherit system config; }
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}:
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with import ../lib/testing.nix { inherit system pkgs; };
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with pkgs.lib;
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with import common/ec2.nix { inherit makeTest pkgs; };
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let
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image =
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(import ../lib/eval-config.nix {
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inherit system;
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modules = [
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../maintainers/scripts/openstack/nova-image.nix
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../modules/testing/test-instrumentation.nix
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../modules/profiles/qemu-guest.nix
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];
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}).config.system.build.novaImage;
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in
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makeEc2Test {
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name = "nova-ec2-metadata";
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inherit image;
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sshPublicKey = snakeOilPublicKey; # That's right folks! My user's key is also the host key!
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userData = ''
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SSH_HOST_ED25519_KEY_PUB:${snakeOilPublicKey}
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SSH_HOST_ED25519_KEY:${replaceStrings ["\n"] ["|"] snakeOilPrivateKey}
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'';
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script = ''
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$machine->start;
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$machine->waitForFile("/etc/ec2-metadata/user-data");
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$machine->waitForUnit("sshd.service");
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$machine->succeed("grep unknown /etc/ec2-metadata/ami-manifest-path");
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# We have no keys configured on the client side yet, so this should fail
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$machine->fail("ssh -o BatchMode=yes localhost exit");
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# Let's install our client private key
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$machine->succeed("mkdir -p ~/.ssh");
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$machine->succeed("echo '${snakeOilPrivateKey}' > ~/.ssh/id_ed25519");
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$machine->succeed("chmod 600 ~/.ssh/id_ed25519");
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# We haven't configured the host key yet, so this should still fail
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$machine->fail("ssh -o BatchMode=yes localhost exit");
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# Add the host key; ssh should finally succeed
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$machine->succeed("echo localhost,127.0.0.1 ${snakeOilPublicKey} > ~/.ssh/known_hosts");
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$machine->succeed("ssh -o BatchMode=yes localhost exit");
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# Just to make sure resizing is idempotent.
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$machine->shutdown;
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$machine->start;
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$machine->waitForFile("/etc/ec2-metadata/user-data");
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'';
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}
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