一、Seata

Seata 是一款开源的分布式事务解决方案，致力于提供高性能和简单易用的分布式事务服务。Seata 将为用户提供了 AT、TCC、SAGA 和 XA 事务模式，为用户打造一站式的分布式解决方案。

下面将使用Docker 主要依靠docker-compose 工具来进行Seata Server集群的安装，在安装前请确保服务器环境已经安装Docker 和 docker-compose，由于我们将信息注册到注册中心nacos中，请也确保已经安装nacos。

关于nacos的集群环境可以参考：

Docker 搭建 Nacos集群：https://blog.csdn.net/qq_43692950/article/details/122031557

seata官网：http://seata.io

二、Seata Server 集群搭建

集群安装架构：

主机	角色
192.168.40.130	mysql，seata-server1
192.168.40.167	seata-server2
192.168.40.168	seata-server3

首先在Nacos中新建配制文件：

Data ID：seataServer.properties
Group：SEATA_GROUP
配制内容：

transport.type=TCP
transport.server=NIO
transport.heartbeat=true
transport.enableTmClientBatchSendRequest=false
transport.enableRmClientBatchSendRequest=true
transport.rpcRmRequestTimeout=5000
transport.rpcTmRequestTimeout=10000
transport.rpcTcRequestTimeout=10000
transport.threadFactory.bossThreadPrefix=NettyBoss
transport.threadFactory.workerThreadPrefix=NettyServerNIOWorker
transport.threadFactory.serverExecutorThreadPrefix=NettyServerBizHandler
transport.threadFactory.shareBossWorker=false
transport.threadFactory.clientSelectorThreadPrefix=NettyClientSelector
transport.threadFactory.clientSelectorThreadSize=1
transport.threadFactory.clientWorkerThreadPrefix=NettyClientWorkerThread
transport.threadFactory.bossThreadSize=1
transport.threadFactory.workerThreadSize=default
transport.shutdown.wait=3
service.vgroupMapping.default_tx_group=default
service.default.grouplist=127.0.0.1:8091
service.enableDegrade=false
service.disableGlobalTransaction=false
client.rm.asyncCommitBufferLimit=10000
client.rm.lock.retryInterval=10
client.rm.lock.retryTimes=30
client.rm.lock.retryPolicyBranchRollbackOnConflict=true
client.rm.reportRetryCount=5
client.rm.tableMetaCheckEnable=false
client.rm.tableMetaCheckerInterval=60000
client.rm.sqlParserType=druid
client.rm.reportSuccessEnable=false
client.rm.sagaBranchRegisterEnable=false
client.rm.sagaJsonParser=fastjson
client.rm.tccActionInterceptorOrder=-2147482648
client.tm.commitRetryCount=5
client.tm.rollbackRetryCount=5
client.tm.defaultGlobalTransactionTimeout=60000
client.tm.degradeCheck=false
client.tm.degradeCheckAllowTimes=10
client.tm.degradeCheckPeriod=2000
client.tm.interceptorOrder=-2147482648
store.mode=db
store.lock.mode=file
store.session.mode=file
store.publicKey=
store.file.dir=file_store/data
store.file.maxBranchSessionSize=16384
store.file.maxGlobalSessionSize=512
store.file.fileWriteBufferCacheSize=16384
store.file.flushDiskMode=async
store.file.sessionReloadReadSize=100
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=jdbc:mysql://192.168.40.130:3306/seata?useUnicode=true&rewriteBatchedStatements=true
store.db.user=root
store.db.password=root123
store.db.minConn=5
store.db.maxConn=30
store.db.globalTable=global_table
store.db.branchTable=branch_table
store.db.distributedLockTable=distributed_lock
store.db.queryLimit=100
store.db.lockTable=lock_table
store.db.maxWait=5000
store.redis.mode=single
store.redis.single.host=127.0.0.1
store.redis.single.port=6379
store.redis.sentinel.masterName=
store.redis.sentinel.sentinelHosts=
store.redis.maxConn=10
store.redis.minConn=1
store.redis.maxTotal=100
store.redis.database=0
store.redis.password=
store.redis.queryLimit=100
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.distributedLockExpireTime=10000
client.undo.dataValidation=true
client.undo.logSerialization=jackson
client.undo.onlyCareUpdateColumns=true
server.undo.logSaveDays=7
server.undo.logDeletePeriod=86400000
client.undo.logTable=undo_log
client.undo.compress.enable=true
client.undo.compress.type=zip
client.undo.compress.threshold=64k
log.exceptionRate=100
transport.serialization=seata
transport.compressor=none
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898
tcc.fence.logTableName=tcc_fence_log
tcc.fence.cleanPeriod=1h

在你指定的mysql 中新建数据库 seata ，并执行下面SQL脚本，创建global_table、branch_table、lock_table 三个表：

-- the table to store GlobalSession data
drop table if exists `global_table`;
create table `global_table` (
  `xid` varchar(128)  not null,
  `transaction_id` bigint,
  `status` tinyint not null,
  `application_id` varchar(32),
  `transaction_service_group` varchar(32),
  `transaction_name` varchar(128),
  `timeout` int,
  `begin_time` bigint,
  `application_data` varchar(2000),
  `gmt_create` datetime,
  `gmt_modified` datetime,
  primary key (`xid`),
  key `idx_gmt_modified_status` (`gmt_modified`, `status`),
  key `idx_transaction_id` (`transaction_id`)
);

-- the table to store BranchSession data
drop table if exists `branch_table`;
create table `branch_table` (
  `branch_id` bigint not null,
  `xid` varchar(128) not null,
  `transaction_id` bigint ,
  `resource_group_id` varchar(32),
  `resource_id` varchar(256) ,
  `lock_key` varchar(128) ,
  `branch_type` varchar(8) ,
  `status` tinyint,
  `client_id` varchar(64),
  `application_data` varchar(2000),
  `gmt_create` datetime,
  `gmt_modified` datetime,
  primary key (`branch_id`),
  key `idx_xid` (`xid`)
);

-- the table to store lock data
drop table if exists `lock_table`;
create table `lock_table` (
  `row_key` varchar(128) not null,
  `xid` varchar(96),
  `transaction_id` long ,
  `branch_id` long,
  `resource_id` varchar(256) ,
  `table_name` varchar(32) ,
  `pk` varchar(36) ,
  `gmt_create` datetime ,
  `gmt_modified` datetime,
  primary key(`row_key`)
);

开始搭建 seata-server 环境

首先在三台主机上创建配制目录，或者使用nfs挂载：

mkdir -p /seata-server/config

在该目录下，创建 registry.conf 注册配制文件

vi /seata-server/config/registry.conf

写入以下内容：

registry {
  type = "nacos"
  
  nacos {
  # seata服务注册在nacos上的别名，客户端通过该别名调用服务
    application = "seata-server"
  # 请根据实际生产环境配置nacos服务的ip和端口
    serverAddr = "192.168.40.1:8848"
  # nacos上指定的namespace
    namespace = ""
    cluster = "default"
    username = "nacos"
    password = "nacos"
  }
}

config {
  type = "nacos"
  
  nacos {
    # 请根据实际生产环境配置nacos服务的ip和端口
    serverAddr = "192.168.40.1:8848"
    # nacos上指定的namespace
    namespace = ""
    group = "SEATA_GROUP"
    username = "nacos"
    password = "nacos"
  # 从v1.4.2版本开始，已支持从一个Nacos dataId中获取所有配置信息,你只需要额外添加一个dataId配置项
    dataId: "seataServer.properties"
  }
}

编写docker-compose 文件：

version: "3.1"
services:
  seata-server:
    image: seataio/seata-server:1.4.2
    hostname: seata-server
    ports:
      - "8091:8091"
    environment:
      # 指定seata服务启动端口
      - SEATA_PORT=8091
      # 注册到nacos上的ip。客户端将通过该ip访问seata服务。
      # 注意公网ip和内网ip的差异。
      - SEATA_IP=192.168.40.130
      - SEATA_CONFIG_NAME=file:/root/seata-config/registry
    volumes:
    # 因为registry.conf中是nacos配置中心，只需要把registry.conf放到./seata-server/config文件夹中
      - "/seata-server/config:/root/seata-config"

注意将SEATA_IP修改为每个主机的ip。
启动：

docker-compose up -d

然后查看nacos中的服务列表信息：

已经有三个实例启动了。

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