MariaDB Galera cluster on IPv6

MariaDB Galera

I try to set as much IPv6-only infrastructure as possible and the same goes for a new MariaDB Galera cluster I had to build.

According to the release notes MariaDB 10.1 should have IPv6 support, but it didn’t work out for me. I wouldn’t get my Galera cluster to work over IPv6-only.

Galera

I tracked the root-cause down to Galera not parsing the addresses properly and it had to be tweaked a bit.

Configuration

With the configuration posted below I was able to get a MariaDB 10.1 setup working on IPv6-only.

[mysqld]
query_cache_size=0
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
innodb_doublewrite=1
query_cache_type=0

bind-address = ::

wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so

wsrep_cluster_name="ns01"
wsrep_cluster_address="gcomm://ns011.XXX.eu,ns012.XXX.nl,ns013.XXX.info"

wsrep_sst_method=rsync

wsrep_node_name="ns011"

wsrep_provider_options = "gmcast.listen_addr=tcp://[::]:4567; ist.recv_addr=[2a00:f10:121:XX:XX:a0ff:fe00:1bc7]:4568"
wsrep_node_address = "[2a00:f10:121:XX:XX:a0ff:fe00:1bc7]:4567"
wsrep_sst_receive_address = "[2a00:f10:121:XX:XX:a0ff:fe00:1bc7]:4444"

This resulted in the Galera cluster functioning properly on a IPv6-only network. It’s indeed a bit more configuration then with IPv4, but that will probably be resolved in a future release.

The MariaDB status properly shows being connected over IPv6:

MariaDB [(none)]> show status like 'wsrep_incoming_addresses';
+--------------------------+--------------------------------------------------------------------------------------------------------------------+
| Variable_name            | Value                                                                                                              |
+--------------------------+--------------------------------------------------------------------------------------------------------------------+
| wsrep_incoming_addresses | [2a00:f10:121:XX:XX:a0ff:fe00:1bc7]:3306,[2a00:f10:400:XX:XX:d8ff:fe00:2ef]:3306,[2a00:1d20:3:XX:XX:c01:3:53]:3306 |
+--------------------------+--------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

MariaDB [(none)]>

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Wido den Hollander

I am the CTO at PCextreme B.V. and i will keep this blog just to post some interesting information about my daily work on Linux (and other) systems.