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 Topic: Easy HTTP load balancing with Apache |
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Steffen
Moderator
Joined: 15 Oct 2005
Posts: 3094
Location: Hilversum, NL, EU
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 Posted: Sun 20 Dec '09 12:18 Post subject: Easy HTTP load balancing with Apache |
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Usually a single AMP system is enough to serve - let's say - around 500 concurrent users. Sometimes more, sometimes less, strongly depending on the particular web application, the overall architecture of your system, of course the hardware itself, and how you define "concurrent users".
Nevertheless, if your server gets too slow, you'll need to take actions. You may upgrade your server up to the maximum (aka vertical scaling), optimize your software (aka refactoring), and finally add more servers (aka horizontal scaling). The whole process of horizontal scaling is quite complex and far too much for a single blog post, but here's a first shot. Others will follow.
Read more.....at http://blogs.sun.com/oswald/entry/easy_http_load_balancing_with
Steffen |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7373
Location: Germany, Next to Hamburg
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| Posted: Tue 05 Jan '10 11:17 Post subject: |
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Well I tried that on my linux test box and while restarting using graceful I get some errors
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[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(8) failed in child 10552 for worker proxy:reverse
[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(0) failed in child 10552 for worker http://servera
[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(2) failed in child 10552 for worker http://serverb
[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(4) failed in child 10552 for worker http://serverc
[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(6) failed in child 10552 for worker http://serverd
[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(1) failed in child 10552 for worker http://servera
[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(3) failed in child 10552 for worker http://serverb
[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(5) failed in child 10552 for worker http://serverc
[Sun Dec 20 16:43:16 2009] [error] proxy: ap_get_scoreboard_lb(7) failed in child 10552 for worker http://serverd
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