Questions tagged [galera]

Galera Cluster for MySQL is a true Multimaster Cluster based on synchronous replication.

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MariaDB Galera Cluster simultaneously got 2000+ Connections on single node How to trace this issue

I am using MariaDB Galera Cluster (Master/Master) having 5 nodes with specs of 32Core 64GB Ram Ubuntu 20.04 Personal Vm-Machines at own Datacenter Top of these nodes, Haproxy is configured which ...
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Getting error while connecting with other nodes in cluster

I create Galera cluster for mysql 8, when i'm restarting the nodes it is connecting in the cluster but after few seconds its getting disconnected. Please help me to fix this issue. Please see the logs-...
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2answers
283 views

kubernetes mariadb-galera cluster - bitnami helm chart - Readiness probe failed

I am trying to setup a mariadb-galera cluster through the bitnami helm chart in my kubernetes cluster (1 master, 3 nodes). I have modified the myvalues.yaml to include an existingClaim: dbstorage and ...
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29 views

How to restore a Galera Cluster node 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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1answer
31 views

Is it Safe to Use “ufw allow from xx.xx.xx.xx” Command for IP Addresses Which are Faced With UFW_BLOCK?

I have UFW opened on my database servers and I have seen a lot of UFW_BLOCK logs. Is it safe or right to use "ufw allow from xx.xx.xx.xx" and "ufw allow to xx.xx.xx.xx" command for ...
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51 views

WireGuard Failover for MySQL Galera Cluster

I'm setting up four servers across four locations in an attempt to create a geo-redundant MySQL Galera cluster. Two of the servers are behind NAT, and I'm currently attempting to use WireGuard to ...
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1answer
52 views

galera cluster slow on hyperV (faster on ESX)

Solution inline We encountered a strange issue and are basically out of ideas by now: We setup a galera cluster (3 Nodes + MaxScale LB) for a customer and he reported slowness. We were unable to ...
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Firewall Ports for MariaDB Galera

I am trying to secure my MariaDB Galera servers. They are setup and configured to use SSL. wsrep_on = ON wsrep_provider = /usr/lib/galera/libgalera_smm.so wsrep_cluster_name ...
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2answers
131 views

MariaDB galera cluster, add node without interruption

I would like to setup a Galera Cluster with 3 servers. But i have a question who can be a problem : How can i add a new IP in wsrep_cluster_address parameter to allow this new server to be sync in ...
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114 views

How can I use garbd+mariabackup to back up a MariaDB/Galera cluster?

I'm migrating a Galera cluster from MySQL to MariaDB 10.3.27, and as part of the process I'd like to change the backup method from the somewhat fiddly (and blocking) garbd+rsync to garbd+mariabackup. ...
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1answer
36 views

Galera cluster up sync but missing variable wsrep_cluster_size

I have a Galera cluster up running and in sync, but it's missing wsrep_cluster_size, see the command screenshot below. MariaDB [(none)]> show variables like 'wsrep_cluster_size'; Empty set (0.01 ...
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1answer
80 views

Galera Manager on none Amazon environment

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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877 views

Galera + MariaDB: Deadlock: wsrep aborted transaction

I have 1 server configured the galera, 4 servers with mariadb and 1 with haproxy. But when I want to do an update on any server I get the error "Deadlock: wsrep aborted transaction" or "...
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84 views

MariaDB Galera needs openssl 1.0.0 on RHEL 8

I have a RHEL 8.3 installation. It comes with openssl.x86_64 1:1.1.1g-11.el8. However the MariaDB 10.5.7 Galera needs libssl and libcrypto 1.0.0. ldd libgalera_smm.so ldd: warning: you do not have ...
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1answer
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Mixing Galera and MariaDB/MySQL replication

reading about it online, it appears we can use both Galera replication and native MariaDB/MySQL replication together. Can anyone confirm that this is correct? I'm thinking of a scenario where Data ...
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322 views

How Can I Remove a MariaDB Galera Cluster

I have made MariaDB-Galera replication with 3 ubuntu servers, but somethimes I need to delete the created cluster, so I can create a new Galera replication cluster. How can I do that? Or how can I ...
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1answer
96 views

NginX and Galera Cluster are friends?

So I've found NginX's official tutorial, how to use NginX Plus as the proxy for the MariaDB Cluster. However, if I do this with my standard NginX (not the Plus edition) I constantly get the error ...
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9 views

Why is mysql failing on boot, but not after restarting using galera?

I'm using mysql and I've setup a galera cluster with two machines. I have a problem where after I configured galera using the config bellow, and rebooting the machine, mysql fails to start and because ...
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190 views

MariaDB Galera Cluster Rolling Upgrade - Replication Warning WSREP tx protocol version

I am upgrading a MariaDB Galera cluster from MariaDB 10.1.44 up to MariaDB 10.4.13 on Red Hat. I upgraded 1 member of the cluster and of course ran mysql_upgrade --skip-write-binlog when the software ...
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1answer
48 views

MariaDB crashing

We have a MariaDB cluster using Galera for replication. As of late (last 2-3 weeks) both have been crashing. Below is a sample backtrace [Thread debugging using libthread_db enabled] Using host ...
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0answers
28 views

Galera replication when two nodes can't communicate

Let's say I have a 3 nodes Galera cluster with MariaDB composed of servers A, B and C. Server A and server B can't communicate between each other but both servers can communicate with Server C. How ...
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41 views

Can not stop mysqld after database upgrade

I have an old Galera cluster (MySQL 5.5) that I am upgrading to Percona XtraDB (MySQL 5.7) on Ubuntu 18.04 LTS. I have successfully imported the database with xtrabackup and synced the cluster - so ...
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1answer
335 views

Several MaxScale instances connected to one MariaDB Galera Cluster

In short, I have one MariaDB Galera Cluster consisting of 3 nodes. I have 3 independent servers on which MaxScale running. Are there any disadvantages to connecting three independent MaxScale ...
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1answer
289 views

Import of .SQL file is very slow with HeidiSQL

I have a database on a MariaDB server that I need to copy on a Galera Cluster on other machines. I used HeidiSQL to create a dump file which is pretty fast actually. The database is about 500Mb. ...
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1answer
346 views

mariadb galera cluster, resync nodes behind

I've followed this tutorial, and have a 3 server cluster set up behind a NGINX reverse proxy. https://www.digitalocean.com/community/tutorials/how-to-configure-a-galera-cluster-with-mariadb-on-...
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Trying to install MySQL with WSREP API by Ansible

I am trying to install a galera cluster (mysql with wsrep 5.7) on a centos 7.7 with ansible. My rule file: - name: Start the MySQL Daemon (first time) service: name: mysqld enabled: yes ...
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Create MariaDB cluster across 2 seperated OpenShift clusters

Good day, I am looking to create a MariaDB cluster in OpenShift/Kubernetes. The caveat, is that my cluster need to be ''spanned'' across 2 seperated OpenShift/Kubernetes clusters. I am trying to ...
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1answer
51 views

Is it safe to patch Galera without updating MariaDB?

I've been running MariaDB Galera Cluster for some time and only today realised that despite having identical versions of the MariaDB on all nodes, my versions of the Galera plugin are all different. ...
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Εxponentially growing Innodb_row_lock_time on “master” node of MariaDB 10.3 Galera cluster

I've been trying to investigate issues with an application failing, and I have reason to believe that the culprit lies somewhere in the database backend. To this end, I started collecting metrics from ...
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1answer
548 views

MariaDB Galera Cluster over IPSec

I am working on the expandation of my server infrastrucutre, so I orderd Servers in a second datacenter which I want to use as failover location. For better identifiaction I will use "ffm1" for the ...
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1k views

Galera throws “WSREP has not yet prepared …” error but nodes are working

Yesterday we moved from 2 node Galera to 4 node Galera with a brand new infrastructure. But after we move the database, Galera started throwing "WSREP has not yet prepared node for application use" ...
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1answer
140 views

Connecting to MariaDB Galera Cluster takes a long time

I have a 5 node production MariaDb 10.3 Galera cluster that has been running for well over a year. In the last few weeks, it now takes more than 10 seconds for any client to establish a database ...
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1answer
235 views

Can a galera node weight (pc.weight) be a non-integer?

In a MariaDB Galera cluster, you can assign a weight to each node, from 0-255. However, the documentation does not specify if this is allowed to be a decimal number (like 1.5). In other areas, it does ...
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1answer
845 views

Restart Galera Cluster - all nodes with same sequence number

I have a 3 node Galera cluster running MariaDB on Ubuntu 18. I ran a few batch files to add data to the database, then shut down each node as this cluster is being relocated to a different subnet at a ...
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1answer
466 views

MySQL Cluster -> Galera MariaDB Cluster Replication not working, but no errors

I am setting up a database migration between a 2-node master cluster running MySQL Cluster 7.2 (MySQL 5.5) and a 2-node slave cluster (plus arbitrator) running MariaDB 10.3 with Galera clustering. I ...
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2k views

Failed to read uuid:seqno and wsrep_gtid_domain_id from joiner script?

I have a Galera Cluster in production which hosts 3 nodes. Nodes are Debian 9.5. I did some stupid stuff and edited my.cnf and corrupted some stuff. I reverted it back after long hours of fighting. 2 ...
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1answer
449 views

How likely is a Split Brain situation when dealing with Galera clusters?

Assuming I have a server setup where a quorum vote is always satisfied, how likely will a Split Brain situation occur with Galera? My understanding is Galera does its best to avoid it, but does that ...
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1answer
217 views

MariaDB 10.3.10 Galera Cluster not syncing InnoDB table definition

I have a 3 node multimaster MariaDB Galera Cluster that is not syncing a modification to an InnoDB table definition. Server version: 10.3.10-MariaDB MariaDB Server wsrep_provider_version: 25.3.24(...
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100 views

configure pacemaker for galera

I have a galera / mariaDB cluster of two nodes on two remote sites that works perfectly. I want to set up a solution that would pause one of the two servers / node if the ping to an external IP was ...
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1answer
4k views

How to recover Galera cluster node

I'm running a three node, multi-master Galera cluster under MariaDB. One of the nodes has crashed due to a hardware fault (node3) and for whatever reason this crashed one of the healthy nodes too (...
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571 views

Converting Mariadb Galera Cluster into Simple Master Slave Replication Cluster

Now we have this project to convert our Mariadb Galera Cluster (3 nodes) to Simple Master Slave cluster (One master and two slaves). So our goal to get rid of Galera and make our setup just async / ...
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1answer
3k views

Does a Galera equivalent for Postgres exist? [closed]

I've been working with Galera for a number of months and like the failover along with the redundancy. I've got a Postgres DB that is in testing and will probably move to production. Is there a Galera ...
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4answers
887 views

mysql (Perconadb) Galera/Xtrabackup cluster join fails with “Invalid Argument”

I have a MySQL Galera cluster, using Perconadb and Xtrabackup. The nodes can start stand-alone, or can join the cluster if only an IST is required. However, if an SST is required, then this runs to ...
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1answer
74 views

PHP can't connect to 127.0.0.1 or localhost to galera but can iva mysql cmd

I am having an issue with MySQL where I can't connect via localhost or 127.0.0.1, I get "Access denied ". On the same box if I use mysql -p -h localhost -u mysuser -p'mypassword' or mysql -p -h 127....
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1answer
762 views

Galera or master/slave MariaDB

What would be the recommended choice for database replication with failover? I know this is a broad question but I'm curious what the general experiences are when it comes to real life setups. As far ...
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1k views

Mariadb 10.1 - 1 of 3 nodes will not restart

Here is the scenario, had to make a config change to Mariadb in a 3 node cluster. I edited the config file, and shut down the node with: # service mysqld stop Made the change on the other 2 nodes ...
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243 views

Moving entire database server to Galera cluster

We currently have more or less the following setup: Three individual MySQL database servers (individual Linux machines) with 15 to 50 logical databases and 20 to 50 GB of data Galera cluster (MariaDB)...
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2answers
4k views

Why is keepalived running two MASTER nodes in my Sticky VIP configuration?

I have keepalived setup (floating VIP) in front of haproxy on each of my three-node galera cluster nodes. When I restart keepalived on any given node, sometimes I end up with two nodes running in ...
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1answer
857 views

Mariadb tuning - slow writes

Background: I have a a website I am migrating from a stand alone MariaDB server to a MariaDB galera cluster. Part of this had me convert the tables from a large number of MyISAM to InnoDB. For what it ...
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1answer
1k views

MariaDB Galera cluster - 3rd node can not start/connect

I am in the process of trying to set up a MariaDB galera cluster. The first 2 nodes went fine, have them started, connected. On the third node, it won't start/connect. # service mysql start ...