Tagged Questions

MariaDB Galera Cluster is a synchronous multi-master cluster.

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MariaDB Galera Cluster wsrep_cluster_address not working

I have configured MariaDB galera cluster with three nodes on CentOS-6.5 64bits: db1 - 192.168.1.111 db2 - 192.168.1.112 db3 - 192.168.1.113 My /etc/my.cnf.d/server.cnf file is configured as ...
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0answers
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MariaDB Galera cluster nod won't start

I have configured a MariaDB Galera cluster with three nodes. The master node and one of the slave-master node is up and running, but the third node just won't run. The system specs and cluster config ...
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0answers
54 views

MariaDB Galera Cluster - nodes fail to start

This is a new installation (fresh VM and MariaDB install). For some reason, the nodes are having trouble joining the master server. The master server would pause at Preparing binlog files for ...
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1answer
23 views

Importance of uniformity of hardware for Galera cluster

How important is it for the nodes in a Galera cluster to be identical? I've found this answer which says they should be the same: http://dba.stackexchange.com/a/55224/770 I understand that you ...
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1answer
55 views

Integrity constraint violation in Percona XtraDB Cluster

We have a PHP application that uses AWS Load Balancer that connects to 3 Percona Servers. Before we used a single standard Percona Server and that never happened. The cluster starts throwing Primary ...
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15 views

Understanding flow control in MariaDB Galera Cluster?

I am not clear how node state changed. What is the different between node state: JOINED, SYNCED, DONOR/DESYNCED, CLOSED, DESTROYED. These are all state I see in log. I am using MariaDB Galera Cluster ...
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1answer
58 views

what is the right way to restart a mariadb galera cluster?

I am trying to restart cluster. I have two problems in stopping cluster and starting cluster In stopping cluster, I follow the instruction ...
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1answer
109 views

Upgrading MariaDB Galera cluster from 5.5 to 10.0 - rolling upgrade possible?

I've had a good search around and cannot find much on the topic. We want to upgrade our live MariaDB 5.5 Galera cluster to the MariaDB 10.0 branch, ideally without any downtime. We installed ...
2
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1answer
220 views

Does it make sense to run a cluster of database servers in docker containers?

I'm currently looking into setting up a database cluster (MySQL Galera or Percona) but I have only 2 machines. However, according to many sources I've read (This article from the Mariadb KB), the ...
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2answers
340 views

Galera Cluster with MariaDB 10 and asynchronous slave

So, as it's easier to understand what I'm trying to accomplish with a picture. Here's a picture: I'm really not an expert in database administration, so please be patient. I am working on a setup ...
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2answers
147 views

What is the best choice for MySQL high availability (zero downtime)? [closed]

As I know there are many solutions for MySQL HA, but most of them are congenitally not zero downtime solution, like MHA, AWS RDS... That said, if zero downtime is "must have", the only choice is ...
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1answer
31 views

How can I perform this database backup/sanitization task?

I have a 3-node MariaDB/Galera cluster. I need to do two things: Back up the database regularly (multiple gigs in size) for a normal, in-case-everything-crashes-I-can-restore-from-this backup. Have ...
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1answer
243 views

Using Galera for simple master-master replication

I was reading the documentation and it specifically mentions that a Galera DB cluster must have at least three nodes to achieve Quorum, although our current setup is working with two. I am tasked ...
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0answers
233 views

Percona XtraDB Cluster/MariaDB Galera Cluster - replication suddenly stops working, cluster thinks it is in “Synced” state

We are trying to populate an empty Galera cluster using myloader. We use the latest version of myloader from repo trunk, the command is as follows: /root/mydumper/myloader -d ...
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1answer
382 views

Is it safe to use mysqldump to backup and restore a master-master cluster

Not sure if the specifics matter but just to get it out of the way I am talking about a Galera cluster on XtraDB (MariaDB). I have a master-master setup and am interested in backing up and restoring ...
1
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1answer
198 views

MariaDB Cluster - data consistency for updates and auto_increment

I have two different MariaDB servers and plan to merge data into one database and create MariaDB Cluster with 3 nodes. I read about Galera and multi-master replication - which MariaDB Cluster use and ...
0
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1answer
116 views

MariaDB Galera setup with drastically different amounts of memory used on cluster nodes - why?

We have a 3 node MariaDB Galera cluster. All nodes are identical and the config on each is identical. They have 64GB of RAM each. The output of the following query is 28: SELECT ...