在Kubernetes(K8s)環境中，我們可以通過部署MySQL主從架構來實現數據的高可用性。接下來，我們將介紹如何搭建K8s MySQL主從。

1.創建MySQL服務憑證：

$ kubectl create secret generic mysql-pass --from-literal=password=yourpassword

2.創建MySQL服務：

apiVersion: v1
kind: Service
metadata:
name: mysql
labels:
app: mysql
spec:
ports:
- port: 3306
selector:
app: mysql
clusterIP: None

3.創建MySQL主從部署：

apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: mysql-master
labels:
app: mysql
spec:
replicas: 1
template:
metadata:
labels:
app: mysql
role: master
spec:
containers:
- name: mysql
image: mysql:5.7
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-pass
key: password
ports:
- containerPort: 3306
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim
---
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: mysql-slave
labels:
app: mysql
spec:
replicas: 1
template:
metadata:
labels:
app: mysql
role: slave
spec:
containers:
- name: mysql
image: mysql:5.7
env:
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-pass
key: password
ports:
- containerPort: 3306
volumeMounts:
- name: mysql-persistent-storage
mountPath: /var/lib/mysql
volumes:
- name: mysql-persistent-storage
persistentVolumeClaim:
claimName: mysql-pv-claim

4.創建MySQL主從服務：

apiVersion: v1
kind: Service
metadata:
name: mysql-slave
spec:
ports:
- port: 3306
selector:
app: mysql
role: slave

5.配置MySQL主從：

CHANGE MASTER TO MASTER_HOST='mysql-master.mysql', MASTER_USER='root', MASTER_PASSWORD='root', MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=107;
START SLAVE;

6.檢查MySQL主從狀態：

SHOW MASTER STATUS;
SHOW SLAVE STATUS\G;

通過以上步驟，我們就成功搭建了K8s MySQL主從架構，實現了數據的高可用性。