121 lines
4.0 KiB
INI
121 lines
4.0 KiB
INI
#
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# This configuration can be used as an example of how URL-switching may be
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# implemented with current haproxy versions.
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#
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# Right now (version 1.2), haproxy can only select a server based on the cookie
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# provided by the client. While this may sound limitated, it is yet possible to
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# combine this feature to rewrites to provide full URL-switching capabilities.
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#
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# For this, we have to chain 3 levels :
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# - front-end : will match the expected URIs and assign a cookie accordingly ;
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# it uses regexps and could match on anything else (Host:,
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# cookies, ...)
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# - switch : will select a back-end depending on the cookie above
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# - back-ends : will perform the load balancing between multiple servers for
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# the same group. Note that this level can be omitted if there
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# is only one server for each backend.
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#
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# Logging is performed at the lower level (back-ends) so that local server
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# problems can be identified quickly with the timers. The client's IP is
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# propagated in the X-Forwarded-For: header.
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#
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global
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daemon
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maxconn 6000 # warning: this has to be 3 times the expected value!
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log 192.168.0.1 local0
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defaults
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mode http
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balance roundrobin
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option dontlognull
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option httpclose
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retries 1
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redispatch
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maxconn 2000
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contimeout 5000
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clitimeout 50000
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srvtimeout 50000
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#
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# This is the instance the client connects to.
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#
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listen frontend 10.20.30.40:80
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option forwardfor # add 'X-Forwarded-For: IP'
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# remove an eventual 'backend' cookie the client might have sent
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reqidel ^Cookie:\ backend=
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# add cookie 'backend=2' for any HTTP method followed by
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# '/img' only or '/img/' followed by anything.
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reqirep ^[^:\ ]*\ /img[/\ ].* \0\nCookie:\ backend=2
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# add cookie 'backend=3' for any HTTP method followed by
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# '/home' only or '/home/' followed by anything.
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reqirep ^[^:\ ]*\ /home[/\ ].* \0\nCookie:\ backend=3
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# send everything to next stage
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server switch 127.0.0.2:8000
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#
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# This instance is only seen by the 'frontend' instance above. It receives all
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# of its traffic.
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#
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listen switch 127.0.0.2:8000
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# cookie name 'backend' inserted by the 'frontend' instance above
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cookie backend
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# default server 'backend1' gets the default traffic.
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server backend1 127.0.0.3:8001
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# those servers get traffic only if their cookie is present because
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# they are tagged 'backup'.
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server backend2 127.0.0.3:8002 cookie 2 backup
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server backend3 127.0.0.3:8003 cookie 3 backup
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#
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# Backend 1 for dynamic contents.
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# It is made of 4 apache servers which we can test thanks to a CGI script.
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#
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listen backend1 127.0.0.3:8001
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log global
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option httplog
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capture request header X-Forwarded-For len 15
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option httpchk /cgi-bin/testhost.pl
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server apache1 192.168.1.1:80 maxconn 100 check inter 2000 fall 3
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server apache2 192.168.1.2:80 maxconn 100 check inter 2000 fall 3
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server apache3 192.168.1.3:80 maxconn 100 check inter 2000 fall 3
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server apache4 192.168.1.4:80 maxconn 100 check inter 2000 fall 3
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#
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# backend 2 for images (/img).
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# It is made of 3 Tux servers which we test by requesting the /img/logo.png
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# file which should be present when file-systems are mounted.
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#
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listen backend2 127.0.0.3:8002
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log global
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option httplog
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capture request header X-Forwarded-For len 15
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option httpchk /img/logo.png
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server tux5 192.168.1.5:80 check inter 2000 fall 3
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server tux6 192.168.1.6:80 check inter 2000 fall 3
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server tux7 192.168.1.7:80 check inter 2000 fall 3
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#
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# backend 3 for home directories (/home). These are the same machines as for
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# dynamic content, except that a different server is bound to another port.
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# We test the service by checking that the file "/home/webmaster/started"
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# exists.
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#
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listen backend3 127.0.0.3:8003
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log global
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option httplog
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capture request header X-Forwarded-For len 15
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option httpchk /home/webmaster/started
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server light1 192.168.1.1:8080 check inter 2000 fall 3
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server light2 192.168.1.2:8080 check inter 2000 fall 3
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server light3 192.168.1.3:8080 check inter 2000 fall 3
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server light4 192.168.1.4:8080 check inter 2000 fall 3
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