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Re: [Linux-cluster] RE: HA Clustering - Need Help



--- Net Cerebrum <netcerebrum gmail com> wrote:

> On 1/29/07, Roger Peña Escobio <orkcu yahoo com>
> wrote:
> >
> >
> > --- Net Cerebrum <netcerebrum gmail com> wrote:
> >
> > > I am now dealing with the issue of configuring
> the
> > > network interfaces. As of
> > > now I have configured ethernet bonding on each
> of
> > > the hosts to achieve
> > > network interface redundancy also. However this
> > > leads to a lot of network
> > > traffic since the same interfaces are being used
> for
> > > heartbeat / monitoring
> > > also. Therefore, I am thinking of using the two
> > > ethernet interfaces
> > > individually, one interface for monitoring and
> the
> > > other one for the LAN
> > > through which the clients will be able to access
> the
> > > hosts. They would be
> > > connected to separate switches and the fence
> devices
> > > would also be on the
> > > monitoring / control network. So I assume that
> the
> > > arrangement would be
> > > something like:
> > >
> > > Node A
> > > eth0 - 192.168.100.1
> > > eth1 - 172.16.1.101
> > > fence device - 192.168.100.11
> > >
> > > Node B
> > > eth0 - 192.168.100.2
> > > eth1 - 172.16.1.102
> > > fence device - 192.168.100.12
> > >
> > > The interfaces eth0 and fence devices would be
> > > connected through a switch,
> > > while the other interfaces (eth1) would be on
> the
> > > LAN where clients would be
> > > accessing them. In addition there would be two
> more
> > > floating / shared IP
> > > addresses 172.16.1.201 for the database server
> and
> > > 172.16.1.202 for the
> > > application server which would be defined in the
> > > Resources section of
> > > Cluster Configuration Tool and would not be
> > > mentioned in /etc/hosts (read
> > > somewhere in the documentation).
> > >
> > > Please let me know if these assumptions are
> correct.
> > > I am just wondering how
> > > does the cluster manager figure out which
> interfaces
> > > to use for heartbeat
> > > and monitoring. I haven't seen any such
> > > configuration option in the
> > > system-config-cluster program.
> > I guess it will use the interface with the right
> IP to
> > reach the nodes ;-) or the one used to reach the
> > default router if the nodes are outside any of its
> > local networks
> > I guess, in your configuration, if the nodes names
> are
> > bounding to IP 192.168.100.x (through DNS or
> > /etc/hosts) then cluster applications will use
> eth0
> > for its traffic
> > am I wrong?
> 
> 
> If that's true then I think we need to specify only
> the monitoring IPs in
> the cluster configuration along with the host names.
> What happens to the
> other set of static IP addresses which belong to the
> interfaces on the LAN
> subnet ? Do they get used anywhere in the
> configuration ? Any ideas ?

you mean yours 172.16.1.x IPs ? the floating IP (the
one that is move between the node during
relocalization) ?
well, I think, again just guessing, that they are not
used for cluster internal comunication not its network
interfases, but ofcourse, should be monitoread by
cluster services.

cu
roger


__________________________________________
RedHat Certified Engineer ( RHCE )
Cisco Certified Network Associate ( CCNA )


 
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