changing SNAT pool every week by iRule

I didn't ~exactly write it to your specifications. ;) The above iRule is based on weeks of the year (1-52). The "%W" means the week of the year starting on Monday, so every Monday the value would cycle (next week). We'll take the modulus 4 of that number to get a value between 0 and 3. Example:

 

 

Week = Value

 

1 = 1

 

2 = 2

 

3 = 3

 

4 = 0

 

5 = 1

 

6 = 2

 

...

 

50 = 2

 

51 = 3

 

52 = 0

 

 

A few additional points:

 

 

1. This runs on every client request (CLIENT_ACCEPTED or HTTP_REQUEST). Also consider that at midnight on Sunday, should someone be in an active session, the snat/snatpool would change. I'm not 100% certain what the affect of that would be mid-session.

 

 

2. This is a VIP-global setting, so when you say "server A using using snatpool A", understand that the snat/snatpool is applied to all servers in the pool.

 

 

3. It's still possible to get it to rotate on a Wednesday, but would require a little extra work.

 

 

4. Because this calculation is triggered on every client request, you may not want to log all of that.