In this hands-on lab, you are working as a DBA and have been tasked with configuring a Write Scalable MariaDB Galera Cluster.
The cluster is already up and running, but you will need to install the Galera Load Balancer and configure it appropriately.
Successfully complete this lab by achieving the following learning objectives:
- Set the root Database User’s Password and Create a Database User Account
The database nodes are running and connected to the cluster, however the
rootuser’s password has not been set.
You must first set the
rootuser’s password by running the
Now you can connect to the database as the
rootuser and create a user account:
mysql -u root -p
Once connected, you can use the following SQL to create a user named
remotewho is able to log in remotely. Be sure to replace mypasswd with a password of your choice:
create user remote identified by 'mypasswd'; grant usage on *.* to 'remote'@'%' identified by 'mypasswd';
- Install the Prerequisite Packages
sudo yum -y install git autoconf automake libtool gcc-c++ nmap-ncat
- Build the Binaries
git clone https://github.com/codership/glb cd glb ./bootstrap.sh ./configure make sudo make install
- Configure and Start Galera Load Balancer
We will start one node. More nodes can be added as necessary.
The least-connection policy is used by default to distribute connections across nodes:
sudo cp /home/cloud_user/glb/files/mysql.sh /usr/local/bin/mysql-check.sh sudo cp /home/cloud_user/glb/files/glbd.sh /etc/init.d/glb sudo vim /etc/sysconfig/glbd # Address to listen for client connections at. Mandatory parameter. # To bind to all interfaces only port should be specified. LISTEN_ADDR="10.0.1.100:13306" # Address for controlling connection. Mandatory part is port. # If not specified control socket will not be opened CONTROL_ADDR="127.0.0.1:4444" # Target servers for client connections, space separated. # Target specification: IP[:PORT[:WEIGHT]] (WEIGHT and PORT optional) # WEIGHT defaults to 1, PORT defaults to LISTEN_ADDR port. DEFAULT_TARGETS="10.0.1.100:3306:1" # Other glbd options if any as they would appear on the command line. OTHER_OPTIONS="--watchdog exec:'/usr/local/bin/mysql-check.sh -uremote -pmypasswd'" sudo service glb start sudo service glb status
- Confirm Connection to Node
Create a new connection:
mysql -u root -P 13306 -h 10.0.1.100 -p
Confirm connection count in GLB:
sudo service glb status
- Add Node and Confirm New Connections Are Routed Correctly
Add the node:
sudo service glb add "10.0.1.110:3306:1"
sudo service glb status