Meaning of virtual_ipaddress_excluded in keepalived configuration

keepalivedload balancingvrrp

I had some problems with my keepalived configuration and found the answer in this post: Keepalived for more than 20 virtual addresses

But I am not sure about the difference between virtual_ipaddress and virtual_ipaddress_excluded? Can anyone explain this to me? The doc says:

virtual_ipaddress_excluded { # VRRP IP excluded from VRRP packets

Best Answer

virtual_ipaddress and virtual_ipaddress_excluded both list IP addresses that keepalived may bring up and down on the server but those defined as excluded (i.e. listed in virtual_ipaddress_excluded) are not listed in the VRRP packet itself (source).

Apart from this, I'd be curious to know the purpose of listing / not listing the VIPs in the VRRP packets. Maybe it's just a matter of packet size / amount of traffic, since virtual_ipaddress_excluded is not limited to 20 IP addresses.

Related Solutions

Keepalived – random re-elections

The problem is that you use the default state MASTER for the backup nodes. They should state BACKUP.

  vrrp_instance VIP_61 {
      interface bond0
      virtual_router_id 61
      state BACKUP
      priority 98
      ...

Hope this solves your mistery.

Multimaster Keepalived Configuration with Virtual IP and Load Balancing – Guide

After some investigations, I found CLUSTERIP extension of IPTABES useful for this purpose. Just google it.

For me, at first, it was a bit hard to configure and get the system up. But finally based on a PDF document by Michael Schwartzkopff I managed to do. Unfortunately I forgot the link on the web. However I have the document, just in case. More information might be useful on another question of mine in this regard:

iptable CLUSTERIP doesn't work

Best Answer

Related Solutions

Keepalived – random re-elections

Multimaster Keepalived Configuration with Virtual IP and Load Balancing – Guide

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