String authorizedKeys = OpenSshUtils.serialize(sshKeyPair.getPublic()) + " unittest";
Files.write(authorizedKeysPath, authorizedKeys.getBytes(Charsets.UTF_8));
sshContext = new SshContextImpl("root", privateKey.toFile());
Configuration configuration = ConfigurationImpl.from(workdir.toFile(), properties);
server = CloudServer.build(configuration);
server.start();
}