By TinyCyanCrab
I’m testing the Galera cluster.
The environment is Centos 7.2. DB is MySQL 5.6.
The success message was confirmed using the following instructions.
/etc/init.d/mysql start --wsrep-new-cluster
Starting MySQL… SUCCESS!
But if you check the cluster size, it says 0.
mysql -uroot -p -e “SHOW STATUS LIKE ‘wsrep_cluster_size’”
Enter password: ±-------------------±------+ | Variable_name | Value | ±-------------------±------+ | wsrep_cluster_size | 0 | ±-------------------±------+
The cnf file of the initial node I set is as follows.
/etc/my.cnf.d/galera.cnf
[mysqld] binlog_format=ROW default-storage-engine=innodb innodb_autoinc_lock_mode=2 bind-address=0.0.0.0
Galera Provider Configuration
wsrep_on=ON wsrep_provider=/usr/lib64/galera-3/libgalera_smm.so
Galera Cluster Configuration
wsrep_cluster_name=“test_cluster” wsrep_cluster_address=“gcomm://”
Galera Synchronization Configuration
wsrep_sst_method=rsync
Galera Node Configuration
wsrep_node_address=“my node_1 ip” wsrep_node_name=“galera1”
I turned off both firewall and selinux.
Please tell me the solution.
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Hi @
It’s hard to troubleshoot it like that, quick searches have showed me similar issues which have been resolved like:
- Check if /etc/mysql/my.cnf is missing the line
!includedir /etc/mysql/mysql.conf.d/ - Make sure both servers have the exact same version of MySQL.
Hello,
For MySQL and CentOS 7, I could suggest following the steps from this tutorial here:
https://bobbyiliev.com/blog/galera-cluster-mariadb-10-1-on-centos-7-server
However, as a side note, keep in mind that both MySQL 5.6 and CentOS 7 are both EOL, meaning that they are no longer officially supported and no security updates will be released. So if you are setting this up for a production system, I would advise going for a tech stack that is still supported.
For example, you could set up a Galera Cluster with MariaDB on Ubuntu 20.04 Server as described here:
Best,
Bobby
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