table of contents
fair(7) | Miscellaneous Information Manual | fair(7) |
NAME¶
fair
—
DESCRIPTION¶
fair
is a load balancer for TCP connections. It can be
used to distribute incoming connections for SMTP, HTTP or any other TCP
service to multiple hosts, distributing the load as evenly as possible.
fair
consists of two daemons. The
carrousel
is the front-end; it keeps track of
back-end hosts and their status, and forwards incoming connections to the
back-ends in such a way that the load is distributed fairly. The
transponder
runs on the back-end hosts, it registers
with the carrousel and sends it status information. The TCP connections
forwarded by the carrousel
are not sent to the
transponder
daemons but are sent directly to the
desired service running on the back-end host. Both daemons share a single
configuration file.
EXAMPLES¶
The following example shows how to set upfair
to
service HTTP connections and to distribute them over back-ends in the
192.168.1.0/24 subnet.
The configuration file /etc/fair.conf contains the following:
WorkerService = http BalancerService = http AllowUDP = ^192.168.1.[0-9]+$
On www.example.com, the front-end server receiving the incoming HTTP connections, just run:
carrousel
On each of the back-ends run:
transponder www.example.com
SEE ALSO¶
carrousel(8), transponder(8), fair.conf(5)2005-05-25 | Debian GNU/Linux |