I just got the question to put a connection limit for a single URI path of a virtual server.
The virtual server is used for multiple applications. so like, www.example.com/app1 or /app2.
So If i set the connection limit for the example.com virtual server, the connection limit is set for both app1 and app2. The virtual server has a rewrite profile for this.
Is it possible to set a connection limit for a single application?
The only way I can see it work is an irule, but i'm pretty new to irules, I haven't found anything on the internet about this.
09-Jul-202112:21 - last edited on 04-Jun-202319:23 by JimmyPackets
Hi,
You are looking after limiting L7 requests and not L4 connections which are not aware of the /app1 /app2... paths.
This iRule is a good starting point :
# This iRule limits the number of HTTP Requests from a specified client IP address to 100 HTTP Requests for 5 minutes
# A Data Group IP_Throttle_List will contain the IP addresses that require throttling
when HTTP_REQUEST {
# Check if the IP address is within the defined list of addresses to throttle
if { [class match [IP::client_addr] equals IP_Throttle_List ] } {
# Check if there is an entry for the client_addr in the table
if { [ table lookup -notouch [IP::client_addr] ] != "" } {
# If the value is less than 100 increment it by one
log local0. "Client Throttle: Value present for [IP::client_addr]"
if { [ table lookup -notouch [client_addr] ] < 100 } {
log local0. "Client Throttle: Number of requests from client = [ table lookup -notouch [client_addr] ]"
table incr -notouch [IP::client_addr] 1
} else {
log local0. "Client Throttle: Client has exceeded the number of allowed requests of [ table lookup -notouch [client_addr] ]"
# This else statement is invoked when the table key value for the client IP address is more than 100. That is, the client has reached the 100 request limit
HTTP::respond 200 content {
<html>
<head>
<title>Information Page</title>
</head>
<body>
We are sorry, but the site has received too many requests. Please try again later.
</body>
</html>
}
}
} else {
# If there is no entry for the client_addr create a new table to track number of HTTP_REQUEST. Lifetime is set to 5 minutes
log local0. "Client Throttle: Table created for [IP::client_addr]"
table set [IP::client_addr] 1 300
}
} else {
return
}
}
