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Raja_Valavan_37's avatar
Raja_Valavan_37
Icon for Nimbostratus rankNimbostratus
Dec 13, 2018

Graceful shutdown of services by removing pool member

hi all,

 

We are working on graceful shutdown of the services. We use tcp socket based application. The socket server listen on 4 different lpars. we use big ip to perform load balance between pool members on 4 different nodes. As part of graceful shutdown

 

  1. we will remove one node (pool member) from pool
  2. With above step SLB will stop sending new requet to the node

But

 

What will happen to the intransit request being processed on the node that is removed from pool?

 

Will it still get responded to client by SLB?

 

BIG-IP
devops
  • Philip_Jonsson's avatar
    Philip_Jonsson
    Icon for MVP rankMVP
    Dec 13, 2018

    Hey Raja Valavan

     

    To give you an example, I had an FTP server being load-balanced on my LTM. During the FTP transfer I removed the FTP pool member. This did not affect my download and even when my download finished, I could initiate new downloads without any issues (when the pool member was deleted from the pool).

     

    So in my environment it works fine.

     

    But why don't you just use Forced Offline or Disabled? In that case you can be certain that active connections will be unaffected. The difference between the two is:

     

    Disabled - Will allow active and persistent connections

     

    Forced Offline - Will only allow active connections.

     

    K13310: Disabling nodes or pool members for maintenance - AskF5