Re: corosync binds to localhost instead of correct IP

Dan Frincu <df.cluster@xxxxxxxxx> · Tue, 25 Jun 2013 10:49:52 +0300

Hi,
On Tue, Jun 25, 2013 at 10:37 AM, Athanasios Kostopoulos <athanasios.kostopoulos@xxxxxxxxxxxxxxxx> wrote:

Dear list,

I have the following problem when trying to implement a two-node failover cluster, using Hetzner as the hosting provider.

my corosync.conf is as follows:

# Please read the corosync.conf.5 manual page
compatibility: whitetank

totem {
	version: 2

	secauth: off
	interface {
		member {
			memberaddr: 144.76.91.XXX

		}
		member {
			memberaddr: 5.9.121.XXX
		}

		ringnumber: 0
		bindnetaddr: 5.9.121.0
		mcastport: 5405

		ttl: 1
	}
	transport: udpu
}

logging {
	fileline: off

	to_logfile: yes
	to_syslog: yes
	debug: on
	logfile: /var/log/cluster/corosync.log

	debug: off
	timestamp: on
	logger_subsys {
		subsys: AMF

		debug: off
	}
}

the problem is that 5.9.121.XXX binds correctly (and appears under crm_mon to be a part of the cluster)
udp        0      0 5.9.121.XXX:5405         0.0.0.0:*                           8281/corosync

but 144.76.91.XXX fails and binds to localhost instead.

udp        0      0 127.0.0.1:5405          0.0.0.0:*                           7889/corosync   

You're not supposed to use the same bindnetaddr in both places, it's relevant only at node level for UDPU (your use case). On the node where you have the 144.* address, use that as bindnetaddr.

Regards,
Dan

Analysis of tcpdump logs indicates that 144.76.91.XXX replies to 5.9.121.XXX with an ICMP type 3 (destination unreachable), code 3 (port unreachable).

corosync -f output will print repeatedly:

Jun 24 12:53:28 corosync [TOTEM ] Totem is unable to form a cluster because of an operating system or network fault. The most common cause of this message is that the local firewall is configured improperly.

UDP traffic is enabled between the 2 hosts, no firewalls are currently in place and I am using Debian (thus no SELinux).

Any ideas for a work around between this issue? Is it even possible to create a cluster with 2 machines on different subnets or do I need to order servers within the same subnet?

Thanks in advance for any replies.

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-- 
Dan FrincuCCNA, RHCE

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