MySQL

MySQL is a popular SQL open source database for a wide range of popular web-based applications including WordPress.

Before you start, ensure you have Ondat installed and ready on a Kubernetes cluster. See our guide on how to install Ondat on Kubernetes for more information.

Deploying MySQL on Kubernetes

You can find the latest files in the Ondat use cases repository

git clone https://github.com/storageos/use-cases.git storageos-usecases

StatefulSet defintion

apiversion: apps/v1
kind: statefulset
metadata:
 name: mysql
spec:
 selector:
   matchlabels:
     app: mysql
     env: prod
 servicename: mysql
 replicas: 1
 ...
 spec:
     serviceaccountname: mysql
      ...
      volumemounts:
       - name: data
         mountpath: /var/lib/mysql
         subpath: mysql
       - name: conf
         mountpath: /etc/mysql/mysql.conf.d
   ...
volumeclaimtemplates:
 - metadata:
     name: data
     labels:
       env: prod
   spec:
     accessmodes: ["readwriteonce"]
     storageclassname: "storageos"
     resources:
       requests:
         storage: 5gi

This excerpt is from the StatefulSet definition. This file contains the VolumeClaim template that will dynamically provision storage, using the Ondat storage class. Dynamic provisioning occurs as a volumeMount has been declared with the same name as a VolumeClaim.

Move into the MySQL examples folder and create the objects
```
cd storageos-usecases
kubectl create -f ./mysql
```

Confirm MySQL is up and running.

$ kubectl get pods -w -l app=mysql
NAME        READY    STATUS    RESTARTS    AGE
mysql-0     1/1      Running    0          1m

Connect to the MySQL client pod and connect to the MySQL server through the service

$ kubectl exec client -- mysql -h mysql-0.mysql -e "show databases;"
Database
information_schema
mysql
performance_schema

Configuration

If you need custom startup options, you can edit the ConfigMap file 15-mysqld-configmap.yaml with your desired MySQL configuration settings.