order of irules

The iRule wiki has a page on events you can reference (Click here).

 

 

Event code is triggered as the event occurs. The events are triggered based on profiles on the VIP. For a standard VIP with a TCP and HTTP profile, the following events could be triggered (Click here:

 

 

Request events:

 

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CLIENT_ACCEPTED - clientside - triggered when LTM receives and accepts a connection from a client

 

HTTP_REQUEST - clientside - triggered when an HTTP profiles

 

HTTP_REQUEST_DATA - clientside - triggered if HTTP::collect was called in HTTP_REQUEST

 

LB_SELECTED - clientside - triggered when a node has been selected per the load balancing algorithm

 

LB_FAILED - clientside - triggered when a node couldn't be selected or isn't reachable

 

SERVER_CONNECTED - serverside - triggered when a connection is established with the node

 

HTTP_REQUEST_SEND - serverside - triggered when LTM sends the HTTP request to the node

 

CLIENT_CLOSED - clientside - triggered when the client connection is closed

 

 

Response events:

 

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HTTP_RESPONSE - serverside - triggered when LTM receives the HTTP response from the node

 

HTTP_RESPONSE_DATA - serverside - triggered if HTTP::collect was called in HTTP_RESPONSE

 

SERVER_CLOSED - serverside - triggered when the server connection is closed

 

 

If you have multiple instances of the same event in different rules on the same VIP, then priority comes into play. unRuleY gave a good explanation of priority in this post (Click here). By default all events have a priority of 500. You can manually specify a priority for an event using 'when EVENT_NAME priority PRIORITY_NUMBER' with the priority value being 1 to 1000. The lower the priority value, the higher the precedence for event evaluation. If two events have the same priority in two different rules, the rule which is listed first in the VIP configuration will be evaluated first.

 

 

If you want more specific suggestions for your scenario, try posting the rules you're working with.

 

 

Aaron