[Pacemaker] CoroSync's UDPu transport for public IP addresses?

[Dejan Muhamedagic]

Hi,

On Mon, Dec 29, 2014 at 06:11:49AM +0300, Dmitry Koterov wrote:
> Hello.
> 
> I have a geographically distributed cluster, all machines have public IP
> addresses. No virtual IP subnet exists, so no multicast is available.
> 
> I thought that UDPu transport can work in such environment, doesn't it?
> 
> To test everything in advance, I've set up a corosync+pacemaker on Ubuntu
> 14.04 with the following corosync.conf:
> 
> totem {
>   transport: udpu
>   interface {
>         ringnumber: 0
>         bindnetaddr: ip-address-of-the-current-machine
>         mcastport: 5405
>   }

You need to add the member directives too. See corosync.conf(5).

Thanks,

Dejan

> }
> nodelist {
>   node {
>     ring0_addr: node1
>   }
>   node {
>     ring0_addr: node2
>   }
> }
> ...
> 
> (here node1 and node2 are hostnames from /etc/hosts on both machines).
> After running "service corosync start; service pacemaker start" logs show
> no problems, but actually both nodes are always offline:
> 
> root at node1:/etc/corosync# crm status | grep node
> OFFLINE: [ node1 node2 ]
> 
> and "crm node online" (as all other attempts to make crm to do something)
> are timed out with "communication error".
> 
> No iptables, selinux, apparmor and other bullshit are active: just pure
> virtual machines with single public IP addresses on each. Also tcpdump
> shows that UDB packets on port 5405 are going in and out, and if I e.g.
> stop corosync at node1, the tcpdump output at node2 changes significantly.
> So they see each other definitely.
> 
> And if I attach a gvpe adapter to these 2 machines with a private subnet
> and switch transport to the default one, corosync + pacemaker begin to work.
> 
> So my question is: what am I doing wrong? Maybe UDPu is not suitable for
> communications among machines with public IP addresses only?

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