在Kubernetes上部署有状态应用程序(数据库)：
步骤1：部署MySQL服务
apiVersion: v1
kind: Service
metadata:
name: mysql
spec:
ports:
- port: 3306
selector:
app: mysql
clusterIP: None
首先，我们在端口3306上为MySQL数据库部署服务，所有Pod均具有标签键app: mysql。
接下来，创建以下资源：Kubectl create -f mysql_service.yaml
步骤2：部署MySQL Deployment
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: mysql
spec:
selector:
matchLabels:
app: mysql
strategy:
type: Recreate
template:
metadata:
labels:
app: mysql
spec:
containers:
- image: mysql:5.6
name: mysql
env:
# Use secret in real usage
- name: MYSQL_ROOT_PASSWORD
value: password
ports:
- containerPort: 3306
name: mysql
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim
此Deployment在3306端口上创建带有MySQL5.6镜像和密码(使用secret)的Pod。我们还将附加一个持久卷mysql-pv-claim，将在接下来的步骤中进行显示。
创建资源：Kubectl create -f mysql_deployment.yaml
第3步：创建持久卷
apiVersion: v1
kind: PersistentVolume
metadata:
name: mysql-pv-volume
labels:
type: local
spec:
# persistentVolumeReclaimPolicy: Retain
storageClassName: manual
capacity:
storage: 20Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
这将创建一个持久卷，我们将使用它来附加到容器，以确保Pod重启时的数据安全。该持久卷具有ReadWriteOne访问模式，拥有20GB的存储空间，存放路径是 ” /mnt/data “，我们所有的数据都将保存在该路径中。
创建以下资源：Kubectl create -f persistence_volume.yaml
第4步：创建持久卷声明
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 20Gi
该声明从上面创建的“持久卷”中声明20GB，并具有与上面的“持久卷”相同的访问模式。
创建以下资源：Kubectl create -f pvClaim.yaml
完整yaml文件，包含Service, Deployment, PersistentVolume, PersistentVolumeClaim：
apiVersion: v1
kind: Service
metadata:
name: mysql
spec:
ports:
- port: 3306
selector:
app: mysql
clusterIP: None
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
name: mysql
spec:
replicas: 1
selector:
matchLabels:
app: mysql
strategy:
type: Recreate
template:
metadata:
labels:
app: mysql
spec:
containers:
- image: mysql:5.6
name: mysql
env:
# Use secret in real usage
- name: MYSQL_ROOT_PASSWORD
value: password
ports:
- containerPort: 3306
name: mysql
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: mysql-pv-volume
labels:
type: local
spec:
# persistentVolumeReclaimPolicy: Retain
storageClassName: manual
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim
spec:
storageClassName: manual
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
运行：kubectl apply -f mysql.yaml
步骤5：测试MySQL数据库
kubectl exec -it [pod-name] -- mysql -h mysql -ppassword
此命令在运行MySQL的集群中连接到一个Pod，并连接到MySQL服务器。如果连接成功，则说明你的MySQL数据库已启动并正在运行。
参考：
