[Linux-cluster] corosync issue with two interface directives

[Steven Dake]

On 07/12/2010 07:45 PM, Digimer wrote:
> On 10-07-12 03:38 PM, Dan Frincu wrote:
>> Just a wild stab in the dark, but both your multicast groups result in
>> the same MAC address 01:00:5e:5e:01:01. Now these are supposed to be
>> redundant connections, which means different IP/port/MAC's, different
>> routes, in case one fails the other one takes over. Try changing the
>> multicast groups so that the they differ at the end of the address,
>> rather than at the beginning.
>>
>> You could use 226.94.1.1 for ring 0 and 226.94.1.2 for ring 1. The key
>> thing to remember here is that when building a multicast MAC address,
>> you only use the low order 23 bits of the multicast IP address, thus
>> allowing for overlapping of close high order bits in the multicast IP
>> address.
>>
>> Regards.
>
> Hi Dan,
>
> I tried changing my config file as per your recommendation, but it
> didn't seem to sort out the problem. The 'corosync-objctl' output only
> shows one ring. Oddly though, when I don't start corosync via cman, and
> instead start corosync by itself, both rings are in fact shown...
>
> Also, I must claim ignorance - I am not familiar with how multicast
> addresses map to MAC addresses. Perhaps I am missing something
> fundamental here? I originally extrapolated the second ring's config by
> adapting the first ring which, itself, was adapted from example configs
> available in the docs.
>

Corosync doesn't use /etc/corosync/corosync.conf when started from cman. 
  It uses /etc/cluster/cluster.conf.

Regards
-steve

> Here is my current corosync.conf file:
>
> ------------------------------------------------------------------
> # This is a skeleton example configuration file.
> compatibility: whitetank
>
> # Totem Protocol options.
> totem {
> version: 2
> secauth: off
> threads: 0
> rrp_mode: passive
> interface {
> # This is the back-channel subnet, which is the primary network
> # for the totem protocol.
> ringnumber: 0
> bindnetaddr: 10.0.1.0
> mcastaddr: 226.94.1.1
> mcastport: 5405
> }
> interface {
> # This is the storage network, which acts as a secondary, backup
> # network for the totem protocol.
> ringnumber: 1
> bindnetaddr: 10.0.0.0
> mcastaddr: 227.94.1.2
> mcastport: 5405
> }
> }
>
> logging {
> to_syslog: yes
> fileline: off
> to_stderr: yes
> to_logfile: off
> to_syslog: yes
> #logfile: /var/log/corosync.log
> debug: on
> timestamp: on
> }
>
> amf {
> mode: disabled
> }
> ------------------------------------------------------------------
>