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Entry level of simple irules writing

2022-07-19 06:49:00 【Did you learn to waste today】

There may be a mistake , Please also point out
irules effect ： The system has more refined customization requirements for data control ; There are higher requirements for the functional support of standard protocols
irules Use TCL sentence ：

#： notes , With ; Or end of line feed

[ command ]( When commands are nested, use [])

：： Global variable declarator

class： Global array variables , Four types ：address（IP Address ）、string（ character string ）、integer（ The number ）、external fail（ External file ）;
matchclass： Match statement , Parameters 2 For matching conditions ,1 and 3 For matching parameters
Permutation character ：$
（ example

set a 100 
set b $a
 take a The value of b

）, There is no need to ：$

In double quotes ：{} Chinese characters are treated as ordinary characters
（ example ：

set b {
    $a + 2}
expr $b*4
 The result is a+2*4
 If you want to output the result as （a+2）*4
set b {
    [expr$a+2]}
expr $b*4

）
The operator

Irules Contains Events ：

When HTTP_REQUEST{
    }
When HTTP_RESPONSE{
    }

[HTTP::uri]：HTTP representative HTTP agreement ,uri It means to take the uri,：： Denotes subordination ,uri Belong to HTTP Command system
Common logic systems ：

if{
    }{
    
}elseif{
    
}
else{
    
}


Switch（options）<>{
    
Case string:
<>
Break;
Default:
<>
Break;
}

Output log：log[<facility>.<level>]<message>

# Notice the space indent

Simple Irules：
1、 Delete response Header Head content

when HTTP_RESPONSE {
     
	 log local0. "Removing unwanted headers - $RequestedURL"  
	HTTP::header remove "Server" 
	 HTTP::header remove "X-Powered-By"  
	HTTP::header remove "X-Pad"
 }

2.1、 load ： According to different addresses assigned to different pool

 when HTTP_REQUEST {
    
	if {
     [IP::addr [IP::remote_addr] equals 10.10.X.0/24] }  {
    
		Log local0. "Load balancing to in_network_http_pool"  
		pool /Common/in_network_http_pool  
	}  else  {
    
		log local0. "Load balancing to out_network_http_pool"  
		pool /Common/out_network_http_pool  
	}
}

2.2、 According to the different uri Load to different pool

When HTTP_REQUEST{
    
	If{
     [HTTP::uri] contains “ data ” }{
    
		Pool   Appoint pool
	}else{
    
		Pool  all_pool}
	}
}

3、 Insert X-Forward-for

when HTTP_RESPONSE {
      
 HTTP::header insert X-Forwarded-For [IP::remote_addr]] 
}

4、 Modify the return content of the page

when HTTP_RESPONSE {
    
    if {
     [HTTP::status] eq "404" } {
    
     log local0. "HTTP 404 on $RequestedURL"  
        HTTP::respond 200 content "<html> <head><title>Apology Page</title></head> <body>Oops,I got lost（ The modified page ）</body> </html>" 
     event disable
    }
}

5、 Disable Events

event disable

6、 Add priority

 when HTTP_RESPONSE priority 100 {

7、 Redirect

When HTTP_REQUEST{
    
	If{
     [HTTP::uri] contains “ keyword ”}{
    
		HTTP::redirect”https://[HTTP::host][HTTP::uri]”
	}
}

8、 Include keyword access a, Otherwise visit b：

When HTTP_REQUEST{
    
	If{
     [HTTP::uri] contains “ keyword ”}{
    
		HTTP::redirect”https://a.com”
	}else{
    
		HTTP::redirect”https://b.com}
	}
}

9.1、 Conversation retention be based on header head
example ：

header baotou 
When HTTP_REQUEST{
    
	If{
     [HTTP::header “header Field in header ”] !=”” }{
    
		Persist uie [HTTP::header “header Field in header ”]
	}
}

9.2、 be based on cookie（session ID） Conversation retention

10、 Example

when HTTP_REQUEST {
    
       if {
     [IP::addr [IP::remote_addr] equals 10.10.4.0/24] } {
     
           log local0. "Load balancing to in_network_http_pool"  
           pool /Common/in_network_http_pool  
           } else {
    
               log local0. "Load balancing to out_network_http_pool" 
               pool /Common/out_network_http_pool 
           }
               log local0. "Inserting XFF header for [IP::remote_addr]"
               HTTP::header insert X-Forwarded-For [IP::remote_addr]
               set RequestedURL [HTTP::host][HTTP::uri]
               }
when HTTP_RESPONSE {
    
    if {
     [HTTP::status] eq "404" } {
    
     log local0. "HTTP 404 on $RequestedURL"  
        HTTP::respond 200 content "<html> <head><title>Apology Page</title></head> <body>Oops,I got lost</body> </html>" 
     event disable
    }
}

Reference resources ：《Irules Programming book 》

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https://yzsam.com/2022/200/202207170519391955.html

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