MySQL Deployment¶

1. Introduction¶

MySQL is a lightweight relational database management system developed by MySQL AB in Sweden and currently owned by Oracle Corporation. Currently, MySQL is widely used on medium and small websites on the Internet due to its small size, fast speed, low total cost of ownership, open-source nature, and free availability. Most medium and small website developments choose Linux + MySQL as their website database.

MySQL is a relational database management system that stores data in different tables rather than in a single large repository, which increases speed and flexibility.

2. Prerequisites¶

A Kubernetes cluster has been deployed
The OpenEBS storage plugin driver has been deployed

root@k8s-node01 /etc]# kubectl  get pods -n kube-system|grep openebs
openebs-localpv-provisioner-6b56b5567c-k5r9l   1/1     Running   0          23h
openebs-ndm-jqxtr                              1/1     Running   0          23h
openebs-ndm-operator-5df6ffc98-cplgp           1/1     Running   0          23h
openebs-ndm-qtjxm                              1/1     Running   0          23h
openebs-ndm-vlcrv                              1/1     Running   0          23h

3. Preparation for Installation¶

Since MySQL consumes significant resources and requires exclusive use of cluster resources, we need to configure cluster scheduling in advance.

4. Cluster Label Configuration¶

Execute commands to label the cluster:

# According to the cluster plan, label the k8s node that needs to deploy the MySQL service (single node)
# xxx represents the actual node in the cluster used to deploy the MySQL service
kubectl label nodes xxx mysql=true

Check the labels:

kubectl get nodes --show-labels  | grep 'mysql'

5. Cluster Taint Configuration¶

Execute commands to set taints on the cluster:

Tips

If the MySQL service is not planned to run on a dedicated node, you do not need to taint the node; this step can be skipped.

kubectl taint node  xxxx infrastructure=middleware:NoExecute

6. Configure StorageClass¶

Configure a dedicated StorageClass for MySQL:

# Copy the following YAML content into the k8s cluster and save it as a YAML file. Modify it according to your actual situation before deployment.
apiVersion: storage.k8s.io/v1
allowVolumeExpansion: true
kind: StorageClass
metadata:
  annotations:
    cas.openebs.io/config: |
      - name: StorageType
        value: "hostpath"
      - name: BasePath
        value: "/data/mysql"  # This path can be modified based on actual conditions. Ensure sufficient storage space and that the path exists.
  name: openebs-mysql  # The name must be unique within the cluster. Modify it before deployment in the file /etc/kubeasz/guance/infrastructure/yaml/mysql.yaml 
provisioner: openebs.io/local
reclaimPolicy: Retain
volumeBindingMode: WaitForFirstConsumer

Ensure that the /data/mysql directory has sufficient disk capacity.

Configure data storage space:

# Modify as needed in /etc/kubeasz/guance/infrastructure/yaml/mysql.yaml
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-data
spec:
  accessModes:
  - ReadWriteOnce
  volumeMode: Filesystem
  resources:
    requests:
      storage: 10Gi  # Set the storage size according to actual usage
  storageClassName:  openebs-mysql

7. Installation¶

# The default root administrator password is "mQ2LZenlYs1UoVzi"
# You can modify it before installation via /etc/kubeasz/guance/infrastructure/yaml/mysql.yaml


# Create namespace
kubectl  create  ns middleware
# Deploy MySQL service
kubectl  apply  -f /etc/kubeasz/guance/infrastructure/yaml/mysql.yaml  -n middleware

8. Verification of Deployment and Configuration¶

8.1 Check Container Status¶

[root@k8s-node01 /etc/kubeasz/guance/infrastructure/yaml]# kubectl  get pods -n middleware  |grep mysql
mysql-75499f6fcd-6tc7l      1/1     Running   0          4m36s

8.2 Verify Service¶

Verify MySQL Service Availability

# The default root administrator password is "mQ2LZenlYs1UoVzi"
# You can modify it before installation via /etc/kubeasz/guance/infrastructure/yaml/mysql.yaml

[root@k8s-node01 /etc/kubeasz/guance/infrastructure/yaml]# kubectl  exec -it -n middleware  mysql-xxxxx  -- mysql -uroot  -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.7.40 MySQL Community Server (GPL)

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owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| FT2.0              |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)