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Plesk and failover between two systems (same IP configured on two servers)

Discussion in 'Plesk 10.x for Linux Issues, Fixes, How-To' started by Thomas Becker, Nov 22, 2012.

  1. Thomas Becker

    Thomas Becker Basic Pleskian

    Sep 11, 2009
    Likes Received:
    I have a simple problem but I do not know how to fix it.
    I have two systems with Plesk and Postfix on CentOS 6. On both systems there is the same domain and IP configured:

    System A:
    Customer with Domain customer.com and IP

    System B (failover):
    Customer with Domain customer.com and IP
    Mail service and DNS switched off for customer.com in Plesk

    This is because of the case of a server failure. In such case we can simply switch the routing of the IP from System A to System B and the website customer.com is available again.

    The problem is that Postfix on System B seems to reject mails from System A to any domain on System B. In mail log on System A there is something like "service not available". This is default behavior of Plesks Postfix integration and the anti-spam mechanisms if a system is not authorized to send mails.
    When I remove the IP from System B in Plesk (Tools & Settings --> IP Addresses), the mails are delivered.

    Plesk seems to write the IP in some config files but which one?
    If I know the behavior I can figure out how to solve this.
    Any idea how to proceed?

    Many Thanks.
    Last edited: Nov 22, 2012