Difference between revisions of "KTCPVS HHTTP"
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== Introduction == | == Introduction == | ||
| − | The hhttp scheduler in KTCPVS is to assign jobs to servers according to the | + | The hhttp scheduler in [[KTCPVS]] is to assign jobs to servers according to the |
| − | specified content-based scheduling rules | + | specified content-based scheduling rules, in which regular expression |
matches are hashed and the virtual server is selected based on the | matches are hashed and the virtual server is selected based on the | ||
resulting hash value. | resulting hash value. | ||
| Line 8: | Line 8: | ||
== Using the KTCPVS HHTTP scheduler == | == Using the KTCPVS HHTTP scheduler == | ||
| − | In the example, | + | In the following example, [[KTCPVS]] [[load balancer]] is used to forward requests to different users |
web pages /users/<username>/.* to different web servers, in which | web pages /users/<username>/.* to different web servers, in which | ||
server is selected based on the hash value of username. The tcpvsadm | server is selected based on the hash value of username. The tcpvsadm | ||
| Line 21: | Line 21: | ||
tcpvsadm --add-rule -i web --pattern="/users/([^/]+)/.*" -m 1 -r 192.168.0.12:80 | tcpvsadm --add-rule -i web --pattern="/users/([^/]+)/.*" -m 1 -r 192.168.0.12:80 | ||
| − | The configuration file is as follows: | + | Here, the option '''-m 1''' in tcpvsadm command means the first matched parameter in the request URI for regular expression. The scheduler computes the hash value of the first matched parameter and dispatch request to the i''th'' server, in which '''i''' is its hash value % the server number. |
| + | |||
| + | The configuration file of this settting is as follows: | ||
Virtual web { | Virtual web { | ||
listen = 0.0.0.0:webcache | listen = 0.0.0.0:webcache | ||
| Line 36: | Line 38: | ||
rule = pattern "/users/([^/]+)/.*" match 1 use server 192.168.0.10:www | rule = pattern "/users/([^/]+)/.*" match 1 use server 192.168.0.10:www | ||
} | } | ||
| + | |||
| + | [[Category:Content-Based Scheduling|Hash]] | ||
| + | [[Category:KTCPVS|Hash]] | ||
Latest revision as of 03:35, 14 October 2006
Introduction
The hhttp scheduler in KTCPVS is to assign jobs to servers according to the specified content-based scheduling rules, in which regular expression matches are hashed and the virtual server is selected based on the resulting hash value.
Using the KTCPVS HHTTP scheduler
In the following example, KTCPVS load balancer is used to forward requests to different users web pages /users/<username>/.* to different web servers, in which server is selected based on the hash value of username. The tcpvsadm commands are as follows:
tcpvsadm -A -i web -s hhttp tcpvsadm -a -i web -r 192.168.0.10:80 tcpvsadm -a -i web -r 192.168.0.11:80 tcpvsadm -a -i web -r 192.168.0.12:80 tcpvsadm --add-rule -i web --pattern="/users/([^/]+)/.*" -m 1 -r 192.168.0.10:80 tcpvsadm --add-rule -i web --pattern="/users/([^/]+)/.*" -m 1 -r 192.168.0.11:80 tcpvsadm --add-rule -i web --pattern="/users/([^/]+)/.*" -m 1 -r 192.168.0.12:80
Here, the option -m 1 in tcpvsadm command means the first matched parameter in the request URI for regular expression. The scheduler computes the hash value of the first matched parameter and dispatch request to the ith server, in which i is its hash value % the server number.
The configuration file of this settting is as follows:
Virtual web {
listen = 0.0.0.0:webcache
scheduler = hhttp
startservers = 8
maxclients = 256
minspareservers = 6
maxspareservers = 18
server = 192.168.0.12:www 1
server = 192.168.0.11:www 1
server = 192.168.0.10:www 1
rule = pattern "/users/([^/]+)/.*" match 1 use server 192.168.0.12:www
rule = pattern "/users/([^/]+)/.*" match 1 use server 192.168.0.11:www
rule = pattern "/users/([^/]+)/.*" match 1 use server 192.168.0.10:www
}
