Questions tagged [galera]

MariaDB Galera Cluster is a synchronous multi-master cluster.

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How to configure ProxySQL with Galera to allow using user-defined variables?

My original use case was more complicated, involving calling stored procedures with user-defined variables and getting a result back in the variable, but even this simple thing doesn't work: SELECT @x;...
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Monitor existing cluster using Galera Manager throwing: deployment status error: DB IP address must be provided

I am trying to monitor my existing galera cluster using galera manager. I installed galera manager and chose Monitor existing cluster. I added the ssh keys provided in the manager in the respective ...
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gtid_binlog_pos variable contains two values

I am trying to setup a master-slave replication with galera-cluster (choose 1 node as the primary master) and a standalone mariadb server (slave). I have successfully setup the replication and data is ...
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Mariadb galera cluster with galera load balancer and master-slave replication: Errorno 1062 handler error HA_ERR_FOUND_DUPP_KEY

I have the following setup in my environment. Galera cluster with 2 nodes: db01 and db02. Server with galera load balancer installed: glb01, applications/clients connect to the cluster via port 8010 ...
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WSREP connection to peer timed out, no messages seen in PT3S

I'm running 3 node Galera cluster using MariaDB-server-10.3.13-1.el7.centos.x86_64 and periodically seeing following errors in logs. I did google about this error but didn't find any good answer. Does ...
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How to Tune MariaDB Database System With Right Parameters

I have a MariaDB Galera 3-Node Cluster as the DB system but since I built, it is working with the default parameters. I only changed the parameter as max_connections=3000. It has been about 6 months ...
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Steps to remove node from percona cluster

I have to update the os on a few servers and I need to remove a db from the cluster. wsrep_cluster_address='gcomm://192.168.2.59,192.168.2.60,192.168.2.61,192.168.2.62,192.168.2.63' Do I remove the ...
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Where Should I Install Galera Load Balancer? On Cluster Nodes?

I want to install Galera Load Balancer for my 3-Node Galera Cluster, but where should I install the galera load balancer? Can I install on the cluster nodes or should I build a new server for galera ...
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How to Prevent the Connections for MariaDB Galera-Cluster When There is Only One Active Node?

I was using "rsync" as the wsrep_sst_method in my galera.cnf files on 3-Node Galera Cluster. When it was so, the system served when there was at least 2 active node. So when any two node ...
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MariaDB Galera 3-Node Cluster Sometimes Doesn't Serves

I have 3 Node MariaDB Galera cluster. I am using "mariabackup" as the wsrep_sst_method, but the database system doesn't work properly. I can say that sometimes there are 100 connection ...
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Galera Cluster Crashes together?

Hello I'm currently having trouble with my galera cluster. It was working fine earlier but suddenly all of the Nodes crashed. I have 3 local nodes and 1 node on the cloud. During the time it went down ...
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Is Mysql creating any temp table , when running Mysql delete query?

Server details We have one Galera cluster Mariadb with 3 nodes . On primary node database size is 200GB & diskspace size is 400GB . On other 2 secondary nodes database size is 200GB & ...
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Galera: I want to add "Node X" to my cluster but use "Node Y" to transfer the data

I'm having quite a problem with adding a node to my current Galera cluster. Right now I have 4 nodes on my cluster: 3 of them are on my local and 1 currently on the cloud. I successfully synced my ...
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mariaDB with a 3 node galera cluster is eating more and more RAM

I am running mariaDB 10.3.29 in a 3 node Galera Cluster on 3 VMs with 14G RAM each. Despite configuring to best knowledge, it continues to eat more and more RAM and after around 3 months the machines ...
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Correct way to setup wsrep_notify in MariaDB

I have been running 5 cluster nodes in MariaDB 10.4/galera setup for quite sometime without any wsrep_notify_cmd configuration. To test basic functionality, I added the notify script script and ...
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What will happens if read from a node which just suffering a net partition in Galera sql?

Suppose this mode, I have 3 node with Galera sql, each node is a master. I call them A,B,C. If I have a transaction like update, what will happens if I execute the transaction at node A, but the node ...
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How Can I Find the Problems Occurred on MySQL-MariadbDB Systems?

I have built a three-node galera cluster, so it is a Master-Master replication structure. But sometimes the first node goes down and I can't find the problem causing this. I am only looking at /var/...
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Maxscale configuration for read write split between galera nodes and replicas

I have a 3 node Galera Cluster. One of the Galera Cluster nodes is master to a slave and this slave is master to another two slaves. (see picture below). I would like to configure Maxscale so writes ...
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ERROR 1180 (HY000): Got error 5 during COMMIT

We're using Galera cluster and I'm running below statement to make a new table: create table tab2 select distinct id , report from my_table ; It runs for sometime and after that it fails/cancel ...
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Mariadb galera cluster on asymmetric IP addresses fails IST/SST

I have a 3-node WAN cluster. The nodes are connected to each-other by VPN without a central server so as to avoid a single point of failure. Instead, each node is an openvpn server with another as ...
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Mariadb Galera [ERROR] mysqld got signal 11 ;

I have a galera mariadb cluster on 3 centos 8 linux servers. Each server crashes several times a week. I have 16 Go RAM on one server and 60 Go ram on other servers. Each wsrep recovery takes about 12 ...
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Is it possible to join MySQL 8.0 to a cluster of MySQL 5.7

I have a MySQL 5.7 (5.7.19-17-57-log Percona XtraDB Cluster) cluster using Galera, but I am in the middle of upgrading to 8.0 -- 8.0.23-14 Percona Server (GPL), Release '14'. I wasn't sure if it was ...
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MariaDB Galera Arbitrator failing to sync with SSL

So the scenario is this. I have already setup a 4 node MariaDB Galera cluster (10.5). I'm also adding on top a 5th Galera Arbitrator and everything syncs and connects just fine. However when I enable ...
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ERROR 1047 (08S01): WSREP has not yet prepared node for application use

I have 3 node MySQL Galera cluster in Production, Today when we hit large DDoS on our network cause some issue and assuming some kind of network separation caused following issue on node-1 ERROR 1047 (...
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How to restore a Galera Cluster from backup

I have a 5 node cluster, with 3 running as VMs on different hosts, and 2 nodes as physical machines. We had a power failure which took down the cluster, and I was not able to get any node to restart (...
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galera_new_cluster hangs with galera_recovery

My cluster crashed and i cannot restart the first node with galera_new_cluster. The nodes are distributed geographically in France with medium latency of 12ms. It remains on /usr/bin/galera_recovery ...
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Galera - why can't I use port 4567 for replication?

I have two Galera clusters in two different datacenters. I want to replicate cluster c1(using c1-1 node as replication master) to cluster c2 (using c2-1 node as replication slave). Everything works ...
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Can we use proxysql 2.x for load balancing multiple Galera clusters?

We have recently introduced proxysql 2.x for loadbalancing a galera cluster in production environment. It is working great so far. I have been tasked to separate staging cluster which is currently in ...
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How to limit impact of a bad application on MariaDB Galera Cluster with MaxScale?

I have a Galera Replication cluster with three MariaDB nodes where a Maxscale Active-Passive cluster in front provides a single node image to tis clients. I have a bad behaving client, which opens ...
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Galera cluster slightly slower than single database?

I recently set up a MariaDB galera cluster for our production. I used sysbench to benchmark the cluster against the old database which is on a single server. On my PRD Galera Cluster I got the ...
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Automatically and robustly restarting a Galera cluster

Galera clusters, somewhat famously, have a requirement that nodes need to be shut down and brought back up again in a certain order. There are a few questions here and on other sites about recovering ...
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Galera Manager web gui for mariadb

I want to create a MariaDB 10.4 multi-master cluster on four Ubuntu 20.04 nodes. As you know Galera manager provides a web GUI interface for the cluster and it's handy for monitoring and add or remove ...
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Why setting up new galera cluster with mariabackup as sst starts but all other nodes failed with same error?

I did a fresh reinstallation of mariadb-server on all the nodes (I removed using sudo apt purge mariadb-*) I started the first node using sudo galera_new_cluster it went fine and is still running. but ...
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How to setup Galera Cluster when nodes are located multiple sites?

I am setting up a web app that runs on 2 sites and shares db, Initially I setup 1 Galera Cluster with all nodes in it, but sometimes SST on bringing node up takes lot of time and service start times ...
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How redo log transferred in galera SST

the galera replication can initiate a node with SST(mysql and mariadb) or mariadbbackup(with MariaDB 10.1 and above) . a SST operation works with rsync and transfer data to new node and then apply ...
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My Galera Cluster does not connect across AWS regions

I am building a MariaDB Galera Cluster, on AWS, EC2. Using MariaDB 10.5 and Galera 4. I have two nodes in the California region, named galera_ca and galera_ca2, and a third node in Oregon name ...
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Master node of galera cluster is not in sync, how should I sync them?

master node server id 10 SHOW STATUS LIKE 'wsrep_local_state_comment'; +---------------------------+----------------+ | Variable_name | Value | +---------------------------+-------...
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Mariadb galera cluster master node started and reporting 2 nodes but second node service says activating mariadb

I managed to start the master node mariadb galera cluster, then I started the second node and I check on the first master node; $ sudo mysql -u root -p -e "SHOW STATUS LIKE 'wsrep_cluster_size'&...
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please help starting mariadb galera cluster node

I am getting thsi error: Starting MariaDB 10.4.17 database server... WSREP: Failed to start mysqld for wsrep recovery: '2020-11-23 21:48:20 0 [Note] /usr/sbin/mysqld (mysqld 10.4.17-MariaDB-1:10.4.17+...
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How to increase donor speed on mariadb galera cluster?

hi currently i have database with size 200gb and my every node at 1Gb/s so when 1 node is down and then 2 node will be donor i config mariadb donor with wsrep_sst_method = rsync method. but it's take ...
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How to hot merge MariaDb databases from multiple servers into a single one

Current Configuration I currently have 3 servers: server australia with the database canberra servers belgium and germany are a galera cluster with the database bruxelles. Target Configuration My ...
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Does commit after a normal select can call any fsync or flush operations?

I'm using Mariadb 10.2.16. 3 Node cluster. Coms counts taken at particular time for all 3 (insert,update,commit). Com_inserts are in 1.1K Com_updates are in 1.6k Com_commit are in 10K When ...
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Is it possible to replicate different Galera MAIN-MAIN clusters (MariaDB) with another Galera MAIN-MAIN cluster but as MAIN-SECONDARY asynchronously?

We are a small team of developers and we usually deal with single database access locally or remotely. We are working on a project that needs to have not only replication on the local network (we'll ...
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Percona xtradb cluster 5.7 solution on AWS and on premise. Not all nodes are connected to

We have 3 nodes cluster. 2 in virginia and 1 in ohio. The cluster is working fine we do not have any issues. But nothing pop out when we started doing extensive monitoring using datadog. It shows that ...
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Recover MariaDB & Galera from crash

I have two servers in the same network. Both are ubuntu servers with LAMP. My main server crashed today because of a power failure, after the server restarted MariaDB was totally unresponsive. All the ...
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Best way to prevent lock wait timeout exceeded try restarting transaction

I'm not totally savvy about databases, I just know the basics. We encountered this problem while trying to query something from our database. This query occurs every 10 seconds. This is the first I ...
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386 views

Help setting up Galera Arbitrator

I am testing a MariaDB Galera Cluster set up with only 2 nodes, I have three servers haproxy, node1 and node2 . I was able to set it up and it worked fine until testing phase. There are two types of ...
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Mysql replication between 3 + 1 nodes

Suppose I have the following configuration for mysql 5.6 replication. Nodes A B C D Nodes A,B,C have wsrep_cluster_address set to respective ip's of nodes A,B and C. Then node D has ...
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Need help with some recovery

So i've gone and did something terribly wrong out of haste and not thinking properly. I have a PXC (percona cluster. I guess mysql cluster with Galera?) running with just 1 one being bootstrapped (...
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Galera Mariadb Multi-Master Replication [closed]

I am trying to setup a cluster of 3 servers in 3 different locations; Dallas-US, London-UK, Mumbai-India. On each location I have setup a webserver and db server. On db server I have configured Galera ...

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