Listening UNIX socket is not deleted when stopping Unicorn?

Iñaki Baz Castillo ibc at
Thu Dec 31 09:57:57 EST 2009

El Lunes, 28 de Diciembre de 2009, Eric Wong escribió:
> > Hi, I listen into an UNIX socket but after stopping Unicorn the socket
> > is not removed. Is it the expected behavior?
> Yes.
> Otherwise it's subject to race conditions where the socket
> owned by a new/replacement process gets its socket unlinked.
> Currently Unicorn unlinks any existing socket on the FS before
> attempting to bind to it for the following reasons:
> * I consider this less error-prone, especially when people aren't
>   storing sockets in a directory that's cleared on reboots (like /tmp).
> * This can also be desirable behavior since it can be used to do
>   transparent upgrades/binary replacements in cases where it's less
>   convenient to use USR2+QUIT,  if you're switching between Ruby
>   installations for example.

Hi, just a question:

Then is it totaly safe to delete the socket before starting Unicorn? 
I expect the answer is yes as Unicorn does it.


Iñaki Baz Castillo <ibc at>

More information about the mongrel-unicorn mailing list