When upgrading from a previous release, please be aware of the following incompatible changes: The default version of Apache httpd is now 2.4. If you use the extraConfig option to pass literal Apache configuration text, you may need to update it — see Apache’s documentation for details. If you wish to continue to use httpd 2.2, add the following line to your NixOS configuration: services.httpd.package = pkgs.apacheHttpd_2_2; The host side of a container virtual Ethernet pair is now called ve-container-name rather than c-container-name.