[Linux-HA] ping groups and heartbeat

[Nick Woolley]

Hi,

 

This is a repost of a message originally sent out on the 20th December.
There haven’t been any replies yet and we were wondering if it was missed
during the festive season.

 

We’re using heartbeat over two Ethernet links on two individual NICs. We
can't use comm communication as the nodes are in two physically different
locations.

 

We have our setup working great for all failure scenarios apart from when
both NIC links fail.  In this instance it is possible for us to get a
split-brain between nodes.

 

Ideally we need it so that if connectivity to the internet is broken on both
NIC one and NIC two, heartbeat would always be secondary - no one can get to
it, so I want to force it to become a secondary node - kind of like STONITH,
but self inflicted.

 

We are using heartbeat version 2.0.7 but using configuration options as
defined for version 1.  Our configuration is shown below:

 

logfacility local0

keepalive 2

warntime 10

deadtime 120

initdead 120

ucast eth0 10.16.1.C

ucast eth0 10.16.1.D

ucast eth1 Y.Y.Y.P

ucast eth1 X.X.X.Q

node node1

node node2

ping Y.Y.Y.Z X.X.X.W 10.16.1.E

respawn hacluster /usr/lib64/heartbeat/ipfail udpport 694 auto_failback off

 

We are thinking that we could add a ping group of on node 1:

 

pinggroup other_node Y.Y.Y.P 10.16.1.C Y.Y.Y.Z X.X.X.W

 

And on node 2:

 

pinggroup other_node Y.Y.Y.Q 10.16.1.D Y.Y.Y.Z X.X.X.W

 

This is enough to monitor connectivity to the other nodes and the internet
but we want this to trigger a "service heartbeat restart" rather than use
ipfail.  Ipfail won't work as connectivity between the two nodes of the
cluster will have been lost, and there is no-other communicable node to
ipfail against.

 

Is it possible to setup a pinggroup to run a different script (say one that
sets heartbeat secondary) on failure of all nodes?  We still need ipfail to
work for the other ping nodes.

 

I basically need to ensure that an isolated node - one that is isolated from
the other heartbeat node, and the both internet connections is always
secondary.

 

Is this possible or do I have to use some third party software to do it like
mon?

 

Any help would be much appreciated.

 

Many thanks,

Nick Woolley

 


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