Seata 高可用部署

Seata 的高可用依赖于注册中心、配置中心和数据库来实现

Seata-Server

Seata-Server 需要使用配置中心、注册中心，并把事务数据保存到数据库中，以 Nacos 为例

• 修改application.yml中配置中心、注册中心的配置

seata:
  config:
    # support: nacos, consul, apolyamllo, zk, etcd3
    type: nacos
    nacos:
      server-addr: 127.0.0.1:8848
      group: SEATA_GROUP
      username: xxx
      password: xxx
      ##if use MSE Nacos with auth, mutex with username/password attribute
      #access-key: ""
      #secret-key: ""
      data-id: seataServer.properties
  registry:
    # support: nacos, eureka, redis, zk, consul, etcd3, sofa
    type: nacos
    nacos:
      application: seata-server
      server-addr: 127.0.0.1:8848
      group: SEATA_GROUP
      cluster: default
      username: xxx
      password: xxx
      ##if use MSE Nacos with auth, mutex with username/password attribute
      #access-key: ""
      #secret-key: ""

• 需要修改配置中心上远程配置文件中的以下几个配置(含db与redis,二者选其一 注:redis需seata-server 1.3版本及以上)

service.vgroupMapping.my_test_tx_group=default
store.mode=db|redis
-----db-----
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=jdbc:mysql://127.0.0.1:3306/seata?useUnicode=true
store.db.user=root
store.db.password=123456
----redis----
store.redis.host=127.0.0.1
store.redis.port=6379
store.redis.maxConn=10
store.redis.minConn=1
store.redis.database=0
store.redis.password=null
store.redis.queryLimit=100

• db模式需要在数据库创建 global_table, branch_table, lock_table表

相应的脚本在GitHub 的 /script/server/db/ 目录下

再启动多个seata-server，即可实现其高可用

---

以 Kubernetes 为例，部署文件参考:

apiVersion: v1
kind: Service
metadata:
  name: seata-ha-server
  namespace: default
  labels:
    app.kubernetes.io/name: seata-ha-server
spec:
  type: ClusterIP
  ports:
    - name: service
      port: 8091
      protocol: TCP
    - name: console
      port: 7091
      protocol: TCP
  selector:
    app.kubernetes.io/name: seata-ha-server

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: seata-ha-server
  namespace: default
  labels:
    app.kubernetes.io/name: seata-ha-server
spec:
  replicas: 3
  selector:
    matchLabels:
      app.kubernetes.io/name: seata-ha-server
  template:
    metadata:
      labels:
        app.kubernetes.io/name: seata-ha-server
    spec:
      containers:
        - name: seata-ha-server
          image: docker.io/apache/seata-server:latest
          imagePullPolicy: IfNotPresent
          ports:
            - name: service
              containerPort: 8091
              protocol: TCP
            - name: console
              containerPort: 7091
              protocol: TCP
          resources:
            limits:
              cpu: '2'
              memory: 4Gi
            requests:
              cpu: '1'
              memory: 2Gi
          volumeMounts:
            - name: seata-config
              mountPath: /seata-server/resources/application.yml
              subPath: application.yml
      volumes:
        - name: seata-config
          configMap:
            name: seata-ha-server-config

---

apiVersion: v1
kind: ConfigMap
metadata:
  name: seata-ha-server-config
data:
  application.yml: |
    server:
      port: 7091
    
    spring:
      application:
        name: seata-server
    
    logging:
      config: classpath:logback-spring.xml
      file:
        path: ${log.home:${user.home}/logs/seata}
    
    seata:
      config:
        # support: nacos, consul, apollo, zk, etcd3
        type: nacos
        nacos:
          server-addr: 127.0.0.1:8848
          group: SEATA_GROUP
          username: xxx
          password: xxx
          ##if use MSE Nacos with auth, mutex with username/password attribute
          #access-key: ""
          #secret-key: ""
          data-id: seataServer.properties
      registry:
        # support: nacos, eureka, redis, zk, consul, etcd3, sofa
        type: nacos
        nacos:
          application: seata-server
          server-addr: 127.0.0.1:8848
          group: SEATA_GROUP
          cluster: default
          username: xxx
          password: xxx
          ##if use MSE Nacos with auth, mutex with username/password attribute
          #access-key: ""
          #secret-key: ""