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nova-image: use wget instead of cloud-init (via EC2 API)

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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
2019-01-28 11:59:18 +01:00
parent bf041c3f1d
commit 2858b35100
4 changed files with 160 additions and 83 deletions
Download Patch File Download Diff File Expand all files Collapse all files
nixos/modules/virtualisation/nova-config.nix
+35 -27
View File
@@ -1,4 +1,4 @@
{ lib, ... }:
{ pkgs, lib, ... }:
with lib;
@@ -6,6 +6,8 @@ with lib;
imports = [
../profiles/qemu-guest.nix
../profiles/headless.nix
# The Openstack Metadata service exposes data on an EC2 API also.
./ec2-data.nix
];
config = {
@@ -26,35 +28,41 @@ with lib;
passwordAuthentication = mkDefault false;
};
services.cloud-init.enable = true;
systemd.services.nova-init = {
path = [ pkgs.wget ];
description = "Fetch Metadata on startup";
wantedBy = [ "multi-user.target" ];
before = [ "apply-ec2-data.service" ];
wants = [ "network-online.target" ];
after = [ "network-online.target" ];
script =
''
metaDir=/etc/ec2-metadata
mkdir -m 0755 -p "$metaDir"
# Put /tmp and /var on /ephemeral0, which has a lot more space.
# Unfortunately we can't do this with the `fileSystems' option
# because it has no support for creating the source of a bind
# mount. Also, "move" /nix to /ephemeral0 by layering a unionfs-fuse
# mount on top of it so we have a lot more space for Nix operations.
echo "getting Openstack instance metadata (via EC2 API)..."
if ! [ -e "$metaDir/ami-manifest-path" ]; then
wget --retry-connrefused -O "$metaDir/ami-manifest-path" http://169.254.169.254/1.0/meta-data/ami-manifest-path
fi
/*
boot.initrd.postMountCommands =
''
mkdir -m 1777 -p $targetRoot/ephemeral0/tmp
mkdir -m 1777 -p $targetRoot/tmp
mount --bind $targetRoot/ephemeral0/tmp $targetRoot/tmp
if ! [ -e "$metaDir/user-data" ]; then
wget --retry-connrefused -O "$metaDir/user-data" http://169.254.169.254/1.0/user-data && chmod 600 "$metaDir/user-data"
fi
mkdir -m 755 -p $targetRoot/ephemeral0/var
mkdir -m 755 -p $targetRoot/var
mount --bind $targetRoot/ephemeral0/var $targetRoot/var
if ! [ -e "$metaDir/hostname" ]; then
wget --retry-connrefused -O "$metaDir/hostname" http://169.254.169.254/1.0/meta-data/hostname
fi
mkdir -p /unionfs-chroot/ro-nix
mount --rbind $targetRoot/nix /unionfs-chroot/ro-nix
mkdir -p /unionfs-chroot/rw-nix
mkdir -m 755 -p $targetRoot/ephemeral0/nix
mount --rbind $targetRoot/ephemeral0/nix /unionfs-chroot/rw-nix
unionfs -o allow_other,cow,nonempty,chroot=/unionfs-chroot,max_files=32768 /rw-nix=RW:/ro-nix=RO $targetRoot/nix
'';
boot.initrd.supportedFilesystems = [ "unionfs-fuse" ];
*/
if ! [ -e "$metaDir/public-keys-0-openssh-key" ]; then
wget --retry-connrefused -O "$metaDir/public-keys-0-openssh-key" http://169.254.169.254/1.0/meta-data/public-keys/0/openssh-key
fi
'';
restartIfChanged = false;
unitConfig.X-StopOnRemoval = false;
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
};
};
};
}