OTD Active-Active Failover Group Does Not Work On Oracle Linux 6 Guest vServers In Exalogic Virtual Rack
Last updated on DECEMBER 11, 2017
Applies to:Oracle Traffic Director - Version 220.127.116.11.0 and later
Oracle Exalogic Elastic Cloud Software - Version 18.104.22.168.2 and later
Oracle Virtual Server x86-64
OTD Active-Active failover group does not work on Oracle Linux 6 Guest VM running on Exalogic rack. The same issue does not happen on Exalogic Physical Linux 6 rack or standalone Linux 6 VMs outside of Exalogic.
The normal working scenario is that 2 or more OTD instances are deployed on the nodes which are in the same subnet. Out of these nodes, one will be chosen as active router node and all the other remaining nodes will be backup router nodes. The traffic will be load-balanced among all the OTD instances.
OTD uses Keepalived and Linux Virtual Server (LVS) to perform load balancing and failover tasks.
Issue on Exalogic OTD VM's running OL6 :
The requests routed to the master node are served but we get connection timed out error when requests are routed to remote node. The /var/log/messages shows the following error on the LVS node (that does the MAC rewrite to forward the packets to backup node).
The Error is only noticed on Exalogic VMs and not on Exalogic physical machines. Also, the below error message is only noticed on /var/log/messages of LVS node (master node) only when the request is getting routed to backup node.
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