MySQL is a common relational database management system. As a branch of MySQL, MariaDB is compatible with MySQL and is becoming increasingly popular. In a Kubernetes environment, you can use Prometheus to monitor MySQL and MariaDB database using the open-source MySQL exporter. This document describes how to use Prometheus to monitor MySQL and MariaDB.
Introduction to MySQL Exporter
The MySQL exporter reads database status data from MySQL or MariaDB, converts it to Prometheus metric format, and opens it to the HTTP interface. In this case, Prometheus can collect and monitor these metrics.
Directions
Deploying the MySQL exporter
Note
Before deploying the MySQL exporter, ensure that MySQL or MariaDB has been deployed in the cluster, outside the cluster, or in the cloud service used.
Deploying MySQL
The following example shows how to deploy MySQL to a cluster from the Marketplace.
1. Log in to the TKE console and select Marketplace in the left sidebar.
2. On the Marketplace page, search for and click MySQL.
3. On the Application Details page, click Create Application.
4. On the Create Application page, enter the necessary information and click Create.
5. After the application is created, select Application in the left sidebar and view the details of the application on the page displayed.
6. Run the following command to check whether MySQL runs properly:
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
mysql-698b898bf7-4dc5k 1/1 Running 0 11s
7. Run the following command to obtain the root password:
$ kubectl get secret -o jsonpath={.data.mysql-root-password} mysql | base64 -d
6ZAj33yLBo
Deploying the MySQL exporter
After deploying MySQL, deploy the MySQL exporter as follows:
1. Run the following commands in sequence to create a MySQL exporter account and log in to MySQL:
$ kubectl exec -it mysql-698b898bf7-4dc5k bash
$ mysql -uroot -p6ZAj33yLBo
2. Run the following command to create an account. mysqld-exporter/123456 is used as an example.
CREATE USER'mysqld-exporter' IDENTIFIED BY '123456' WITH MAX_USER_CONNECTIONS 3;
GRANT PROCESS, REPLICATION CLIENT, REPLICATION SLAVE, SELECT ON *.* TO 'mysqld-exporter';
flush privileges;
3. Use the YAML file to deploy the MySQL exporter. An example is as follows:
Note
Replace the account, password, and MySQL connection address in DATA_SOURCE_NAME with real ones.
After deploying the MySQL exporter, configure monitoring data collection to ensure that data exposed by the MySQL exporter can be collected. The following example shows ServiceMonitor definition (The cluster must support ServiceMonitor definition to configure collection rules):
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: mysqld-exporter
spec:
endpoints:
interval: 5s
targetPort: 9104
namespaceSelector:
matchNames:
- default
selector:
matchLabels:
app: mysqld-exporter
The following example shows a native Prometheus configuration:
