What does "STATIONARY_IP" do?

[Greg Evans_1]

Hi All,

I'm just wondering how exactly does the "STATIONARY_IP" directive in a cluster configuration affect the operation of the cluster?

[Kent Ostby · Accepted solution]

The STATIONARY_IP directive indicates a lan card that you are using Serviceguard that you do NOT wish to use as a HEARTBEAT lan.



Best regards,

Kent M. Ostby

[Jeff Schussele]

Hi Greg,

The STATIONARY_IP is an IP that does not float with a package when it fails over - hence the term.
But, this IP can be backed up by another NIC so that if that the original NIC, cable or switch port fails, the MAC & IP can move to the standby port & keep that IP up.
But the bottom line is that a stationary IP will always stay on that system.

HTH,
Jeff

[Michael Steele_2]

Except for admin. purposes the Stat. IP is virtually unused. The Stat. IP has minaimal is any cluster responsibilities. The cluster and cluster failover is controlled by the MAC addresses of the cluster nodes. For example, cmquercl tests the cluster config. file by MAC via linkloop and then builds the cluster binaries only after success.

[Stuart Abramson_2]

I never use it at all.

[Jeff Schussele]

Hi Michael & Stuart,

We use it here frequently.
We use it for nodes that need their "public" IP backed up by a failover NIC.
A frequent use is a single-node cluster where all MC/SG is being used for is NIC(s) failover - no pkgs at all.

But you could also use it to backup the NIC that would also assert the floating pkg IP as well.

If we want NIC redundancy we don't have much choice but MC/SG - except for maybe APA, but it's not quite the same thing & failover is certainly not APA's forte. So we use MC/SG.

My 2 cents,
Jeff