[Nix-dev] nscd startup

[Rickard Nilsson]

Hi,

I have noticed that nscd might start before /etc/resolv.conf has been  
written (I think this is the cause), which results in hostname lookup  
failures after login. It takes a while until the name resolution works,  
even though the network works during all this time. Presumably nscd thinks  
the hostnames are unavailable, and doesn't try querying the name servers  
until some time-to-live has passed. I fixed this on my system by not  
starting the nscd job on the "startup" event, but rather on "ip-up":


--- a/modules/services/system/nscd.nix
+++ b/modules/services/system/nscd.nix
@@ -42,7 +42,7 @@ in
      jobs.nscd =
        { description = "Name Service Cache Daemon";

-        startOn = "startup";
+        startOn = if config.networking.interfaces != [] then "ip-up" else  
"startup";

          environment = { LD_LIBRARY_PATH = nssModulesPath; };


This works much more reliably on my system. If you think this is a  
sensible solution to the problem, I would be happy if it could be  
committed.


Best regards,
   Rickard Nilsson