Now you should patched from 10.3 to 10.4: mysql -V You can install it from the mariadb repo, too: apt install software-properties-common dirmngrĪdd-apt-repository 'deb buster main'Īpt install mariadb-client mariadb-server Mysql Ver 15.1 Distrib 10.3.22-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2 In the next post i will describe how to create an Loadbalancer with HAProxy for your Galera Cluster.Īnd remember that replication is not a replacement for backup! Upgradeĭebian Buster currently delivers version 10.3 of MariaDB and Galera-3. You may want to use Load Balancing for your new cluster. Login as root and check if the second database is also available: show databases On the first node start the database again: systemctl start mariadbĪfter the database running again. Now create a second database: create database test_db2 Login into the second node and check the cluster with “show status like ‘wsrep_%’ ” wsrep_cluster_size 2 Now stop database on the first node: systemctl stop mariadb Now login into DB console on the other nodes and check if the database is available: mysql -u root -p Now create a database on the first node and confirm the status on the other nodes. Check “wsrep_cluster_size” which should be “3”. You should now see your cluster confiuguration. Login into DB console as the cluster root user: mysql -u root -pĬonfirm if Cluster settings are OK. Note: This may take a little bit longer than usual! Third node Restart MariaDB systemctl restart mariadb Open “/etc/mysql//50-server.cnf” again and add the following lines: Now initialize Galera cluster: systemctl stop mariadb Wsrep_provider=/usr/lib/galera/libgalera_smm.so On your first node open “/etc/mysql//50-server.cnf” again and add the following lines: ![]() It is important that the other nodes can reach the each other. Or change it to one ore more specific addresses. Open “/etc/mysql//50-server.cnf” and change the “bind_address” attribute: #bind-address = 127.0.0.1 Removing privileges on test database.īy default mysql listens only on the local 172.0.0.1 interface. Secure each installation with the configuration script by running: mysql_secure_installation The nodes have the following IP adresses: 172.16.201.139, 172.16.201.140 and 172.16.201.141 Installationįirst install MariaDB on all nodes: apt -y install mariadb-server mariadb-client Every node has identical hardware and software. ln -s /etc/apparmor.d/ /etc/apparmor.d/disable/ (Like Ubuntu) AppArmor can prevent mysqld from opening additional ports or running scripts. Semanage port -a -t mysqld_port_t -p tcp 4568 Semanage port -a -t mysqld_port_t -p udp 4567 Semanage port -a -t mysqld_port_t -p tcp 4567 Semanage port -a -t mysqld_port_t -p tcp 4444 Or open ports for galera: semanage port -a -t mysqld_port_t -p tcp 3306 If you have SELinux (Security-Enhanced Linux) enabled on your server, it may block some operations of mysqld.ĭisable SELinux for mysqld: semanage permissive -a mysqld_t This allows all nodes with an ip of the subnet “172.16.201.0/24” to connect to port 3306 via TCP. Or allow a complete subnet (like your internal network): iptables -A INPUT -p tcp -s 172.16.201.0/24 -dport 3306 -m conntrack -ctstate NEW,ESTABLISHED -j ACCEPT This allows the node with ip “172.16.201.139” to connect to port 3306 via TCP. Iptables -A OUTPUT -p tcp -sport 3306 -m conntrack -ctstate ESTABLISHED -j ACCEPT Here is an example to allow only the other cluster nodes: iptables -A INPUT -p tcp -s 172.16.201.139 -dport 3306 -m conntrack -ctstate NEW,ESTABLISHED -j ACCEPT Here is an example for “ufw” firewall: sudo ufw enable I used a seperate internal network so i can just open the ports. Make sure that your cluster nodes can communicate over this ports. * 4567 TCP / UDP (Galera Cluster Communications) ![]() The nodes need to be equal configurated and with the identical software. Multiple nodes with an odd number of nodes. You need a Linux or Unix Operating System. Like true Multi-Master configuration, synchronous replication, conflict detection and impromes the maintenance of your MariaDB servers with automatic provisioning, node isolation and rolling upgrades. Galera give you some nice cluster features.
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