# Clustering over multiple network interfaces

**URL:** <https://forums.percona.com/t/clustering-over-multiple-network-interfaces/3617>\
**Category:** Percona XtraDB Cluster 5.x\
**Created:** [July 16, 2014, 9:39pm UTC](https://forums.percona.com/t/clustering-over-multiple-network-interfaces/3617 "2014-07-16T21:39:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![greengecko](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/greengecko/32/888_2.png) [@greengecko](https://forums.percona.com/u/greengecko)\
**Post date:** [July 16, 2014, 9:39pm UTC](https://forums.percona.com/t/clustering-over-multiple-network-interfaces/3617/1 "2014-07-16T21:39:53Z")

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I have a happily running 3 node cluster, which is running firewalled to the hilt, no problems at all. I have now networked these 3 nodes to a 4th, but am using a VPN to do so, so each node has gained an extra IP address.

I want to use the VPN connections to create an emergency(!) 4th node, but when just reconfiguring this new node to access the other 3 with the new network addresses by updating wsrep\_cluster\_address for this node, I just get a timeout: it downloads galera.cache and grastate.dat, then i get the following in the error log:

2014-07-17 14:19:29 19672 [Note] WSREP: view((empty))  
2014-07-17 14:19:29 19672 [ERROR] WSREP: failed to open gcomm backend connection: 110: failed to reach primary view: 110 (Connection timed out)  
at gcomm/src/pc.cpp:connect():141  
2014-07-17 14:19:29 19672 [ERROR] WSREP: gcs/src/gcs\_core.c:gcs\_core\_open():202: Failed to open backend connection: -110 (Connection timed out)  
2014-07-17 14:19:29 19672 [ERROR] WSREP: gcs/src/gcs.c:gcs\_open():1291: Failed to open channel ‘MYCHANNEL’ at ‘gcomm://192.168.93.210,192.168.93.220,192.168.93.230,192.168.93.1’: -110 (Connection timed out)  
2014-07-17 14:19:29 19672 [ERROR] WSREP: gcs connect failed: Connection timed out  
2014-07-17 14:19:29 19672 [ERROR] WSREP: wsrep::connect() failed: 7  
2014-07-17 14:19:29 19672 [ERROR] Aborting

2014-07-17 14:19:29 19672 [Note] WSREP: Service disconnected.  
2014-07-17 14:19:30 19672 [Note] WSREP: Some threads may fail to exit.  
2014-07-17 14:19:30 19672 [Note] Binlog end  
2014-07-17 14:19:30 19672 [Note] /usr/sbin/mysqld: Shutdown complete

The new node is the 192.168.93.1, and .210, .220 and .230 are the new interfaces on the existing nodes. wsrep\_cluster\_address has been updated on 2 of the 3 existing nodes with the 192.168.93.1 address in addition to the 3 existing external IP addresses and restarted - .210 hasn’t.

Is what I’m trying to do possible? Do I need to add all 7 of the IP addresses, and if so, can it handle multiple connections to the same node ok?

Any suggestions gratefully received… am square eyed from docs!

Cheers,

Steve

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<div class="post-metadata">

**Author:** ![greengecko](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/greengecko/32/888_2.png) [@greengecko](https://forums.percona.com/u/greengecko)\
**Post date:** [July 16, 2014, 10:00pm UTC](https://forums.percona.com/t/clustering-over-multiple-network-interfaces/3617/2 "2014-07-16T22:00:25Z")

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Gah… it was the Galeria 2/3 thing that bit me! All running fine now, with the above configuration.