Configure a monitor/irule to check a webpage health only after login using a test credentials

Finally, I did it! Staging, UA, DEV environment pools are running currently using this custom health monitor and I have been implementing this in the production environment without any issues.

Configuration:

Create new health monitor with the following settings:

From the F5 GUI:

Send string: POST /Account/SignIn HTTP/1.1\r\nHost: host.domain.com\r\nConnection: Close\r\nContent-Length:10\r\nAuthorization: Basic ZjU6ZjVwYXNzd2Q=\r\n\r\0123456789

Receive string: 302 Found

Interval: 10 seconds (use whichever is acceptable)

Timeout: 31 seconds (use whichever is acceptable)

Since we need the monitor to login to the website with the credentials we provide, do the following:

To generate the encrypted auth string like in the send string above:

1. Log in to the BIG-IP command line.
2. Generate an encrypted auth string by using the following syntax:

   echo -n 'username:password' | base64

   For example, if you used the user name f5 and the password f5passwd, the output would appear as follows:

   ZjU6ZjVwYXNzd2Q=

To test the monitor before applying it to the corresponding pool on F5, you can test using the below commands:

From F5 CLI:

tmsh

run /ltm monitor http <health monitor name> destination <dest_ip>
show /ltm monitor http <health monitor name> test-result

Happy learning!