Seata deployment and microservice integration

Deploy Seata Of tc-server

1. download

First we need to download seata-server package , The address in http/seata.io/zh-cn/blog/download.html

Also prepared Baidu online disk download link for you ：

link ：https://pan.baidu.com/s/1gm3MWasl0AzAVBNb6vUC6Q?pwd=hcd6
Extraction code ：hcd6
– From Baidu network disk super member V6 The share of

2. decompression

Unzip this in a non Chinese Directory zip package , Its directory structure is as follows ：

3. Modify the configuration

modify conf In the catalog registry.conf file ：

The contents are as follows ：

registry {
  # tc Registry class of the service , Choose here nacos, It can also be eureka、zookeeper etc. 
  type = "nacos"

  nacos {
    # seata tc  Service registered to  nacos Service name of , You can customize 
    application = "seata-tc-server"
    serverAddr = "127.0.0.1:8848"
    group = "DEFAULT_GROUP"
    namespace = ""
    cluster = "SH"
    username = "nacos"
    password = "nacos"
  }
}

config {
  #  Read tc The configuration file of the server , From here nacos Configuration center read , So if tc It's clustering , Configuration can be shared 
  type = "nacos"
  #  To configure nacos Address and other information 
  nacos {
    serverAddr = "127.0.0.1:8848"
    namespace = ""
    group = "SEATA_GROUP"
    username = "nacos"
    password = "nacos"
    dataId = "seataServer.properties"
  }
}

Cover ：

4. stay nacos Add the configuration

Particular attention , In order to make tc Clusters of services can share configurations , We chose nacos As a unified configuration center . Therefore, the server configuration file seataServer.properties Documents need to be in nacos Middle match .

The format is as follows ：

The configuration is as follows ：

#  Data storage mode ,db On behalf of the database 
store.mode=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&rewriteBatchedStatements=true
store.db.user=root
store.db.password=root
store.db.minConn=5
store.db.maxConn=30
store.db.globalTable=global_table
store.db.branchTable=branch_table
store.db.queryLimit=100
store.db.lockTable=lock_table
store.db.maxWait=5000
#  Business 、 Log and other configurations 
server.recovery.committingRetryPeriod=1000
server.recovery.asynCommittingRetryPeriod=1000
server.recovery.rollbackingRetryPeriod=1000
server.recovery.timeoutRetryPeriod=1000
server.maxCommitRetryTimeout=-1
server.maxRollbackRetryTimeout=-1
server.rollbackRetryTimeoutUnlockEnable=false
server.undo.logSaveDays=7
server.undo.logDeletePeriod=86400000

#  Transmission mode between client and server 
transport.serialization=seata
transport.compressor=none
#  close metrics function , Improve performance 
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898

The database address 、 user name 、 Passwords need to be changed to your own database information .

5. Create database tables

Particular attention ：tc Services when managing distributed transactions , You need to record transaction related data into the database , You need to create these tables in advance .

Create a new one called seata The database of , Run the following method to create a table

These tables mainly record global transactions 、 Branch business 、 Global lock information ：

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
--  Branch transaction table 
-- ----------------------------
DROP TABLE IF EXISTS `branch_table`;
CREATE TABLE `branch_table`  (
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `transaction_id` bigint(20) NULL DEFAULT NULL,
  `resource_group_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `resource_id` varchar(256) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `branch_type` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `status` tinyint(4) NULL DEFAULT NULL,
  `client_id` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `gmt_create` datetime(6) NULL DEFAULT NULL,
  `gmt_modified` datetime(6) NULL DEFAULT NULL,
  PRIMARY KEY (`branch_id`) USING BTREE,
  INDEX `idx_xid`(`xid`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

-- ----------------------------
--  Global transaction table 
-- ----------------------------
DROP TABLE IF EXISTS `global_table`;
CREATE TABLE `global_table`  (
  `xid` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `transaction_id` bigint(20) NULL DEFAULT NULL,
  `status` tinyint(4) NOT NULL,
  `application_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `transaction_service_group` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `transaction_name` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `timeout` int(11) NULL DEFAULT NULL,
  `begin_time` bigint(20) NULL DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `gmt_create` datetime NULL DEFAULT NULL,
  `gmt_modified` datetime NULL DEFAULT NULL,
  PRIMARY KEY (`xid`) USING BTREE,
  INDEX `idx_gmt_modified_status`(`gmt_modified`, `status`) USING BTREE,
  INDEX `idx_transaction_id`(`transaction_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

SET FOREIGN_KEY_CHECKS = 1;

6. start-up TC service

Get into bin Catalog , Run the seata-server.bat that will do ：

After successful startup ,seata-server Should have registered to nacos Registration Center .

Open the browser , visit nacos Address ：http://localhost:8848, Then go to the service list page , You can see seata-tc-server Information about ：

Microservice Integration seata

1. Introduce dependencies

First , We need to introduce... Into microservices seata rely on ：

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
    <exclusions>
        <!-- Lower version ,1.3.0, Thus eliminate -->
        <exclusion>
            <artifactId>seata-spring-boot-starter</artifactId>
            <groupId>io.seata</groupId>
        </exclusion>
    </exclusions>
</dependency>
<!--seata starter  use 1.4.2 edition -->
<dependency>
    <groupId>io.seata</groupId>
    <artifactId>seata-spring-boot-starter</artifactId>
    <version>${seata.version}</version>
</dependency>

2. Modify the configuration file

Need modification application.yml file , Add some configuration ：

seata:
  registry: # TC Configuration of service registry , According to this information, microservices go to the registry to obtain tc Service address 
    #  Reference resources tc Serve your own registry.conf Configuration in 
    type: nacos
    nacos: # tc
      server-addr: 127.0.0.1:8848
      namespace: ""
      group: DEFAULT_GROUP
      application: seata-tc-server # tc The service is nacos Service name in 
      cluster: SH
  tx-service-group: seata-demo #  Transaction group , According to this, get tc Service cluster name 
  service:
    vgroup-mapping: #  Transaction group and TC service cluster The mapping relation of 
      seata-demo: SH