Questions tagged [galera]
Galera Cluster for MySQL is a true Multimaster Cluster based on synchronous replication.
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Does MariaDB-Galera cluster have error tolerance function on sst_user credential?
We have done the testing and confirmed the following system behavior of MariaDB-Galera clustering:
The first-time bootstrap always needs to get everything correct, including the sst_user credentials ...
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Mariadb active passive failover doesn't work with HAProxy
What is wrong with my HAProxy config?
This thread kind of similar, but still not the same: Haproxy mysql failover load balancing
I have an active-passive Mariadb galera cluster.
Today on the master ...
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MaxScale doesn't connect to Galera Cluster
I am working on a distributed HA cloud system and I have a Galera Cluster with 3 separated servers in Docker Swarm. It works as expected.
I have 3 separated services for the Galera members due to ...
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MariaDB Galera cluster with failed node
A client of mine asked a question that I'm not really sure how to answer correctly. His question is: In case of one node falls out of the cluster, stays offline for a few hours or days and then comes ...
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Galera SQL Cluster - reset & rejoin a node
i have a three node galera cluster.
one of the nodes (its a passive not active used node) died and mysql is not able to start again on this host:
InnoDB: We intentionally generate a memory trap.
...
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Galera cluster node fails with "InnoDB: Conflicting lock on table" error
I have a Galera Cluster (MariaDB 10.5) that consists of 3 nodes (one of which is Arbitrator).
Last week I have two incidents: both nodes just stopped responding and the following was found in logs:
...
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HAProxy inside Kubernetes proxying to MariaDB Galera Cluster VMs having intermittent connectivity if more than one pod
My project at work is having applications running on Kubernetes that connect to MariaDB Galera cluster running on VMs. To manage the connections to the MariaDB, I'm using HAProxy running as pods ...
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MariaDB Galera. Why is replication not working?
I tried a lot of manuals for configuring MariaDB Galera and in all cases replication does not work. I struggled with version 10.5
Today I tried version 10.3 and the only thing that appeared was ...
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Different bin log file index on maria db galera nodes
Setup:
Galera Cluster with 3 nodes running in Docker Containers. In front of every node is a maxscale proxy. Remotely is a replication slave running with bin-log replication where the cluster is ...
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Mariadb Galera Cluster Cannot Start Up
I built a mariadb galera cluster on CentOS7. Below is the galera node information:
10.200.67.27 MariaDB-Node1
10.200.67.29 MariaDB-Node2
10.200.67.26 MariaDB-Node3
However, MariaDB-Node2 and ...
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How to sync table data between two nodes of a mariadb galera cluster?
I built a mariadb galera cluster on CentOS7. Below is the galera node information:
10.200.67.27 MariaDB-Node1
10.200.67.29 MariaDB-Node2
10.200.67.26 MariaDB-Node3
However, MariaDB-Node2 was ...
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mariaDB 10.5.12 access denied for [email protected]
fresh installation of mariaDB 10.5.12 on debian 11 was hardened with 'mysql_secure_installation' script, question "Switch to unix_socket authentication [Y/n]" was answered with 'yes'.
Now ...
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Removing a node from Galera 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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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 / ...
