haproxy/tests/conf/test-backlog.cfg

# This is a test configuration.
# It is used to check that the backlog queue works as expected.

global
	maxconn    200
        stats timeout 3s

frontend backlog_def
        mode       http
        timeout    client  15s
        maxconn    100
        bind       :8000
        option     httpclose

frontend backlog_max
        mode       http
        timeout    client  15s
        maxconn    100
	backlog    100000
        bind       :8001
        option     httpclose
[MINOR] add support for the "backlog" parameter Add the "backlog" parameter to frontends, to give hints to the system about the approximate listen backlog desired size. In order to protect against SYN flood attacks, one solution is to increase the system's SYN backlog size. Depending on the system, sometimes it is just tunable via a system parameter, sometimes it is not adjustable at all, and sometimes the system relies on hints given by the application at the time of the listen() syscall. By default, HAProxy passes the frontend's maxconn value to the listen() syscall. On systems which can make use of this value, it can sometimes be useful to be able to specify a different value, hence this backlog parameter. 2008-01-06 09:55:10 +00:00			`# This is a test configuration.`
			`# It is used to check that the backlog queue works as expected.`

			`global`
			`maxconn 200`
			`stats timeout 3s`

			`frontend backlog_def`
			`mode http`
			`timeout client 15s`
			`maxconn 100`
			`bind :8000`
			`option httpclose`

			`frontend backlog_max`
			`mode http`
			`timeout client 15s`
			`maxconn 100`
			`backlog 100000`
			`bind :8001`
			`option httpclose`