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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.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.