On Tue, Feb 01, 2022 at 07:41:08PM +0100, Willy Tarreau wrote:
> - master-worker: some simplifications were applied to the way the new
> process connects to the old one to retrieve listening sockets. In the
> past it would rely on "-x" on the command line, or would try to connect
> to the first socket that had the "expose-fd listener" statement. Now
> the new process will simply reuse the existing worker socket to
> retrieve the old socket FDs so that it will work even without a stats
> socket. As such "-x" is no more used in master mode.
To be a bit more precise, the "-x" option is still used internally, it
is now able to use the internal socketpairs which are used
between the master and the workers. So after a reload you would see
something like this:
68684 pts/14 S+ 0:00 ./haproxy -W -f haproxy.cfg
68703 pts/14 Sl+ 0:00 ./haproxy -sf 68686 -x sockpair@3 -W -f
haproxy.cfg
The biggest benefit is that you don't have to configure anything
anymore to do a hitless reload.
--
William Lallemand
