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> , , , > Using the ACL in HAProxy for Load Balancing Named Virtual Hosts

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September 18th, 2009

Until recently, I wasn’t aware of the ACL system in HAProxy, but once I found it I realized that I have been missing a very important part of load balancing with HAProxy!

While the full configuration settings available for the ACL are listed in the , the below example includes the basics that you’ll need to build an HAProxy load balancer that supports multiple host headers.

Here is a quick example haproxy configuration file that uses ACLs:

global
    log 127.0.0.1 local0
    log 127.0.0.1 local1 notice
    maxconn 4096
    user haproxy
    group haproxy
    daemon

defaults
    log global
    mode http
    option httplog
    option dontlognull
    retries 3
    option redispatch
    maxconn 2000
    contimeout 5000
    clitimeout 50000
    srvtimeout 50000

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backend www_example_com
    balance roundrobin
    cookie SERVERID insert nocache indirect
    option httpchk HEAD /check.txt HTTP/1.0
    option httpclose
    option forwardfor
    server Server1 10.1.1.1:80 cookie Server1
    server Server2 10.1.1.2:80 cookie Server2

backend www_domain_com
    balance roundrobin
    cookie SERVERID insert nocache indirect
    option httpchk HEAD /check.txt HTTP/1.0
    option httpclose
    option forwardfor
    server Server1 192.168.5.1:80 cookie Server1
    server Server2 192.168.5.2:80 cookie Server2

In HAProxy 1.3, the ACL rules are placed in a “frontend” and (depending on the logic) the request is proxied through to any number of “backends”. You’ll notice in our frontend entitled “http-in” that I’m checking the host header using the hdr_end feature. This feature performs a simple check on the host header to see if it ends with the provided argument.

You can find the rest of the Layer 7 matching options by searching for “7.5.3. Matching at Layer 7″ in the configuration doc I linked to above. A few of the options I didn’t use but you might find useful are path_beg, path_end, path_sub, path_reg, url_beg, url_end, url_sub, and url_reg. The *_reg commands allow you to perform RegEx matching on the url/path, but there is the usual performance consideration you need to make for RegEx (especially since this is a load balancer).

The first “use_backend” that matches a request will be used, and if none are matched, then HAProxy will use the “default_backend”. You can also combine ACL rules in the “use_backend” statements to match one or more rules. See the configuration doc for more helpful info.

If you’re looking to use HAProxy with SSL, that requires a different approach, and I’ll blog about that soon.

Categories: , , , Tags: , , , ,
  1. Moschops
    March 16th, 2010 at 10:14 |
    |

    Thanks for this post – the HAProxy docs are a huge laundry list of options so it was really helpful to see a concrete example of how to do a multi-backend configuration with ACLs.

  2. Joey
    April 25th, 2010 at 19:28 |
    |

    Hi,Matt,thanks for the sharing. you mentioned about the HAProxy with SSL, do you have some information about this? I tested the HAProxy with SSL use the TCP mode,but have some questions about the session persistence ,if you can give me some suggestions that’s will be good.Thanks.

  3. mandm
    February 18th, 2011 at 07:51 |
    |

    Matt, this is an awesome article, eagerly waiting to read the haproxy with SSL article and much better if it also mentions about using ACL’s in TCP mode

  1. September 24th, 2009 at 14:06 |
  2. November 18th, 2010 at 04:24 |
  3. January 30th, 2011 at 18:56 |

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