<%3Fxml version="1.0" encoding="UTF-8"%3F> Cialis viagra levitra » Prescription Point | Canadian Pharmacy | Canada Medicine. , 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.

]]> http://www.techrawr.com/2009/09/18/using-the-acl-in-haproxy-for-load-balancing-named-virtual-hosts/feed/ 6 Cialis viagra levitra » Prescription Point | Canadian Pharmacy | Canada Medicine. http://www.techrawr.com/2008/02/26/tips-on-load-balancing-a-joomla-cluster-with-haproxy/ http://www.techrawr.com/2008/02/26/tips-on-load-balancing-a-joomla-cluster-with-haproxy/#comments Tue, 26 Feb 2008 10:48:44 +0000 Matt http://blog.mattbeckman.com/2008/02/26/tips-on-load-balancing-a-joomla-cluster-with-haproxy/ For the past several weeks, I have been working with Joomla in a clustered environment. We have a single load-balancer running HAProxy that sends requests to two web servers synchronized with unison. One server is a hybrid and includes both the MySQL database as well as Apache2/PHP5. The other web server is strictly Apache2/PHP5. We have been renting two super fast dedicated servers temporarily until we acquire some new hardware, so I had to make do with what few servers I had.

cialis viagra levitraHaving written this blog post almost a full year ago, I have since then completely switched all of my Joomla websites to the automatically : Scale My Site. Since doing so, we haven’t had to deal with HAProxy, load balancing, or anything with regard to scaling due to the hosting cloud’s seamlessly clustered environment. I highly recommend anyone reading this article right now to check out to get load balancing/scaling for your Joomla website without breaking a sweat.

The load balancer is located at our own colo. I followed the tutorial on to set up two servers at our colo in an ActivePassive fashion using Heartbeat for redundancy.

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Since I’m using only two web servers and one needs to serve database requests, I decided to set weights in HAProxy so that the hybrid server receives half as many requests as the dedicated web server. Here is an example of what my haproxy.cfg file contains:

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

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

listen webfarm 63.123.123.100:80
    mode http
    balance roundrobin
    cookie SERVERID insert nocache indirect
    option forwardfor
    option httpchk HEAD /check.txt HTTP/1.0

    # Stats
    stats enable
    stats auth admin:password

    # Web Node
    server SBNode1 63.123.123.101:80 cookie Server1 weight 20 check
    # Web + MySQL Node
    server SBNode2 63.123.123.102:80 cookie Server2 weight 10 check

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Many people understand that it’s a super big pain to work with the administrator control panel in a Joomla clustered environment. First of all, you’ll keep getting kicked out every few page requests, even while using sticky/persistent load balancing. Second, working with backend WYSIWYG rich-text editors is nearly impossible. I figured out how to do it, and here’s what I did.

  1. Decide upon the management node
  2. Give the management node a public host entry in DNS (e.g. node1.yourdomain.com)
  3. Open configuration.php for editing
  4. Locate the “live site” variable ($mosConfig_live_site)
  5. Replace with “http://” . $_SERVER["HTTP_HOST"];
  6. Save

Using the current host as the live site allows you to use node1.yourdomain.com as an access point for the control panel. You cialis viagra levitrawork in the control panel without doing this, but you will run into tons of problems with rich-text editors and custom components that request the live site URL in their underlying code.

cialis viagra levitra Recently, I implemented a load balancing solution using HAProxy that used the ACL system to send all traffic with /administrator/ in the URL to one “master” node, and it provided a way around the Joomla configuration change mentioned above. Check out this for more info.

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