Hi, We are using F5 for load balancing and we have 2 instances running. If one of the instance is down, will the f5 server know and route all the requests to the second server? Can anyone explain how it works. Thanks in advance!

Hi shubhamv5, What do you mean by 2 instances.can you share more details.

We have two independent apps running to handle the requests coming on to our server. These requests come to f5 load balancer. I need to understand what will happen if one of the app is down.

These apps are working on the same IPs and Ports?

IPs are same and ports are different.

Hi shubhamv5, Different Ports means different pools, so you can configure two pools, one for each instance, and configure different health monitors.Both instances will be independent from each other.

How f5 handles when an app is down

11 Replies

kolom
Altostratus
Oct 01, 2018
Hi shubhamv5,

What do you mean by 2 instances.can you share more details.
shubhamv5_37337
Nimbostratus
Oct 01, 2018
We have two independent apps running to handle the requests coming on to our server. These requests come to f5 load balancer. I need to understand what will happen if one of the app is down.
kolom
Altostratus
Oct 01, 2018
These apps are working on the same IPs and Ports?
shubhamv5_37337
Nimbostratus
Oct 01, 2018
IPs are same and ports are different.
kolom_265617
Cirrostratus
Oct 01, 2018
Hi shubhamv5,

Different Ports means different pools, so you can configure two pools, one for each instance, and configure different health monitors.Both instances will be independent from each other.
- shubhamv5_37337
  Nimbostratus
  Oct 01, 2018
  The ports are different but in the console I see that both the apps are in same pool. Is it possible to have different health monitors for both of them. Please find the attached image. It looks like both have different health monitors.
- kolom_265617
  Cirrostratus
  Oct 01, 2018
  You can assign different health monitors for different members within the same pool.
  
  Pool > Pool_Name > Memebers > member_name , switch to Advanced configuration.
  
  Under health monitors choose "Member Specific" , and apply the required monitor.
  
  you may also need to check the "Availability Requirement" option under pool configuration.
kolom
Altostratus
Oct 01, 2018
Hi shubhamv5,

Different Ports means different pools, so you can configure two pools, one for each instance, and configure different health monitors.Both instances will be independent from each other.
- shubhamv5_37337
  Nimbostratus
  Oct 01, 2018
  The ports are different but in the console I see that both the apps are in same pool. Is it possible to have different health monitors for both of them. Please find the attached image. It looks like both have different health monitors.
- kolom
  Altostratus
  Oct 01, 2018
  You can assign different health monitors for different members within the same pool.
  
  Pool > Pool_Name > Memebers > member_name , switch to Advanced configuration.
  
  Under health monitors choose "Member Specific" , and apply the required monitor.
  
  you may also need to check the "Availability Requirement" option under pool configuration.
nathe
Cirrocumulus
Oct 01, 2018
This article explains the "Action on Service Down" feature in regards pool members going down and traffic being re-routed. Does this help?

K15095: Overview of the Action On Service Down feature

Rgds N