Show Table of Contents
9.2. IP Virtual Server (IPVS)
Red Hat Enterprise Linux 6.5 introduces a new sync message protocol format. This new format is provided to prevent interruptions to business services caused by persistent connections on backup server nodes timing out prematurely, causing inconsistent state in the case of failover to a backup server node.
This new format is not compatible with versions of Red Hat Enterprise Linux 6.4 or earlier, or kernel versions prior to kernel-2.6.32-406.el6. Upgrade backup nodes before upgrading the master node.
To continue using the old format for sync messages, for example if you need to upgrade the master node prior to the backup nodes, set the value of
/proc/sys/net/ipv4/vs/sync_version to 0.
Where did the comment section go?
Red Hat's documentation publication system recently went through an upgrade to enable speedier, more mobile-friendly content. We decided to re-evaluate our commenting platform to ensure that it meets your expectations and serves as an optimal feedback mechanism. During this redesign, we invite your input on providing feedback on Red Hat documentation via the discussion platform.