它支持两种存储模式，一个是文件，一个是数据库，下面我们分别介绍一下这两种

配置nacos存储配置，注意如果registry.conf中注册和配置使用的是file，就会去读取file.config的配置，如果是nacos则通过nacos动态读取配置

用nacos作为注册中心了，所以我们接下来要做的就是讲配置上传到nacos进行存储

首先我们需要去官网下载Seata的源码，找到其中的script目录：

https://gitcode.net/mirrors/seata/seata

script的目录结构是这样的：

client：存放客户端SQL脚本的，参数配置

config-center：各个配置中心参数导入脚本，config.txt为通用参数文件

server：服务端数据库脚本及各个容器配置

进入config-center/nacos目录，执行脚本，添加nacos配置信息(不要忘记开启nacos服务哦)，命令如下：

ps:下载完成后，将脚本文件放入到seata项目的配置文件夹下（seata-server-1.4.2\conf）：

ps: 需要导入nacos的配置信息文件config.txt需要放在config的上一层目录

ps: 存储模式改成 store.mode=db ，因为我使用的是mysql8.0.17版本的，所以 store.db.driverClassName=com.mysql.cj.jdbc.Driver，需要另外下载jdbc的jar包，下载好后放入项目中seata-server-1.4.2\lib\jdbc的目录下：

剩下的就是配置数据库的相关配置信息（url、username、password）：

store.db.url=jdbc:mysql://127.0.0.1:3306/seata?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai

store.db.user=root

store.db.password=123456

//执行脚本
sh ${SEATAPATH}/bin/nacos-config.sh -h localhost -p 8848 -g SEATA_GROUP -t 5a3c7d6c-f497-4d68-a71a-2e5e3340b3ca -u nacos-w nacos
Parameter Description:

-h: host, the default value is localhost.

-p: port, the default value is 8848.

-g: Configure grouping, the default value is 'SEATA_GROUP'.

-t: Tenant information, corresponding to the namespace ID field of Nacos, the default value is ''.

-u: username, nacos 1.2.0+ on permission control, the default value is ''.

-w: password, nacos 1.2.0+ on permission control, the default value is ''.

让我们看一下nacos那边的配置列表是否有对应的配置数据了：

很显然，已经添加成功了，那接下来我们就需要修改一下Seata服务端配置加载位置，那就需要修改registry.conf文件中的config那段配置，配置如下：

 config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "nacos"    #修改
 
  nacos {
    serverAddr = "127.0.0.1:8848"    #修改
    namespace = ""
    group = "SEATA_GROUP" #跟上面的-g 命令保持一致即可
  }
  #以下代码省略...
}

1、存储模式

1、file存储模式
默认支持的存储模式，直接启动即可，不需要改动任何文件，file模式是单机模式，全局事务会话信息会持久化到本地文件：/bin/sessionStore/root.data，性能较高，具体的命令如下：

sh seata-server.sh -p 8091 -h 127.0.0.1 -m file
2、db存储模式
这个模式是高可用的模式，全局事务会话信息通过db共享的，性能较比file模式较差一些，具体的实现步骤如下：

①创建数据库，表结构如下：

-- the table to store GlobalSession data
--全局事务表
CREATE TABLE IF NOT EXISTS `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`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8;

-- the table to store BranchSession data
--分支事务表
CREATE TABLE IF NOT EXISTS `branch_table`
(
`branch_id` BIGINT NOT NULL,
`xid` VARCHAR(128) NOT NULL,
`transaction_id` BIGINT,
`resource_group_id` VARCHAR(32),
`resource_id` VARCHAR(256),
`branch_type` VARCHAR(8),
`status` TINYINT,
`client_id` VARCHAR(64),
`application_data` VARCHAR(2000),
`gmt_create` DATETIME(6),
`gmt_modified` DATETIME(6),
PRIMARY KEY (`branch_id`),
KEY `idx_xid` (`xid`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8;

-- the table to store lock data
--全局锁表
CREATE TABLE IF NOT EXISTS `lock_table`
(
`row_key` VARCHAR(128) NOT NULL,
`xid` VARCHAR(96),
`transaction_id` BIGINT,
`branch_id` BIGINT NOT NULL,
`resource_id` VARCHAR(256),
`table_name` VARCHAR(32),
`pk` VARCHAR(36),
`gmt_create` DATETIME,
`gmt_modified` DATETIME,
PRIMARY KEY (`row_key`),
KEY `idx_branch_id` (`branch_id`)
) ENGINE = InnoDB
DEFAULT CHARSET = utf8;
②设置事务日志存储方式

进入conf/file.conf，修改属性store.mode="db"

③修改数据库连接

db {
datasource = "druid" ##修改
dbType = "mysql"
driverClassName = "com.mysql.jdbc.Driver"
url = "jdbc:mysql://127.0.0.1:3306/seata" ##修改
user = "mysql" ##修改
password = "mysql" ##修改
minConn = 1
maxConn = 10
globalTable = "global_table"
branchTable = "branch_table"
lockTable = "lock_table"
queryLimit = 100
}
④启动seata

seata-server.bat -h 127.0.0.1 -p 8091 -m db -n 1
关于后面的启动参数这里就不做陈述了，上面表格有详解

2、配置中心说明

Seata根目录config有两个配置文件，registry.conf和file.config

registry.con配置说明

这个文件中只包含了两项配置属相：registry和config，源码如下：

registry {

# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa

type = "file"

nacos {

serverAddr = "localhost"

namespace = ""

cluster = "default"

}

eureka {

serviceUrl = "http://localhost:8761/eureka"

application = "default"

weight = "1"

}

redis {

serverAddr = "localhost:6379"

db = "0"

}

zk {

cluster = "default"

serverAddr = "127.0.0.1:2181"

session.timeout = 6000

connect.timeout = 2000

}

consul {

cluster = "default"

serverAddr = "127.0.0.1:8500"

}

etcd3 {

cluster = "default"

serverAddr = "http://localhost:2379"

}

sofa {

serverAddr = "127.0.0.1:9603"

application = "default"

region = "DEFAULT_ZONE"

datacenter = "DefaultDataCenter"

cluster = "default"

group = "SEATA_GROUP"

addressWaitTime = "3000"

}

file {

name = "file.conf"

}

config {

# file、nacos 、apollo、zk、consul、etcd3

type = "file"

nacos {

serverAddr = "localhost"

namespace = ""

group = "SEATA_GROUP"

}

consul {

serverAddr = "127.0.0.1:8500"

}

apollo {

app.id = "seata-server"

apollo.meta = "http://192.168.1.204:8801"

namespace = "application"

}

zk {

serverAddr = "127.0.0.1:2181"

session.timeout = 6000

connect.timeout = 2000

}

etcd3 {

serverAddr = "http://localhost:2379"

}

file {

name = "file.conf"

}

registry

它可以配置Seata服务注册的地址，支持现在市面上绝大多数的注册中心组件，配置也很简单，只需要修改type即可，然后在对应的配置下，配置好对应服务的ip相关信息即可，比如想用Nacos作为注册中心，那就type=nacos，然后修改ip，源码如下：

registry {

# file 、nacos 、eureka、redis、zk、consul、etcd3、sofa

type = "nacos" #修改，按照上面注释的单词来填写

nacos {

serverAddr = "127.0.0.1:8848" #对应nacos的相关配置

namespace = ""

cluster = "default"

}

# 以下代码省略...

}

这里注意一下，这个type默认是file，表示不用注册中心，如果是file，就可以不用注册中心快速运行Seata，只不过file没有注册中心的动态发现和动态配置的功能

config

用于配置Seata服务端的配置文件地址，意思就是说可以通过config配置来指定Seata服务端的配置信息的加载位置，它支持从远程配置中心读取和本地文件读取两种方式，如果配置为远程配置中心，可以使用type指定，配置形式和上面的registry一样

config {

# file、nacos 、apollo、zk、consul、etcd3

type = "nacos" #修改

nacos {

serverAddr = "127.0.0.1:8848" #修改

namespace = ""

group = "SEATA_GROUP"

}

# 以下代码省略...

}

需要注意的是，如果这里的type是file的话，他默认会加载file.conf文件中的配置信息，那这里就需要讲解一下file.conf文件了

file.conf配置说明

此配置文件存储的是Seata服务端的配置信息，完成配置是：transport(协议配置)、server(服务端配置)、metrics(监控)

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  # the client batch send request enable
  enableClientBatchSendRequest = false
  #thread factory for netty
  threadFactory {
    bossThreadPrefix = "NettyBoss"
    workerThreadPrefix = "NettyServerNIOWorker"
    serverExecutorThreadPrefix = "NettyServerBizHandler"
    shareBossWorker = false
    clientSelectorThreadPrefix = "NettyClientSelector"
    clientSelectorThreadSize = 1
    clientWorkerThreadPrefix = "NettyClientWorkerThread"
    # netty boss thread size,will not be used for UDT
    bossThreadSize = 1
    #auto default pin or 8
    workerThreadSize = "default"
  }
  shutdown {
    # when destroy server, wait seconds
    wait = 3
  }
  serialization = "seata"
  compressor = "none"
}
# service configuration, only used in client side
service {
  #transaction service group mapping
  vgroupMapping.my_test_tx_group = "default"
  #only support when registry.type=file, please don't set multiple addresses
  default.grouplist = "127.0.0.1:8091"
  #degrade, current not support
  enableDegrade = false
  #disable seata
  disableGlobalTransaction = false
}
#client transaction configuration, only used in client side
client {
  rm {
    asyncCommitBufferLimit = 10000
    lock {
      retryInterval = 10
      retryTimes = 30
      retryPolicyBranchRollbackOnConflict = true
    }
    reportRetryCount = 5
    tableMetaCheckEnable = false
    reportSuccessEnable = false
    sqlParserType = druid
  }
  tm {
    commitRetryCount = 5
    rollbackRetryCount = 5
  }
  undo {
    dataValidation = true
    logSerialization = "jackson"
    logTable = "undo_log"
  }
  log {
    exceptionRate = 100
  }
}
 
## transaction log store, only used in server side
## 事务日志存储配置
store {
  ## store mode: file、db
  mode = "file"
  ## file store property
  ## 文件存储的配置属性
  file {
    ## store location dir
    dir = "sessionStore"
    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    maxBranchSessionSize = 16384
    # globe session size , if exceeded throws exceptions
    maxGlobalSessionSize = 512
    # file buffer size , if exceeded allocate new buffer
    fileWriteBufferCacheSize = 16384
    # when recover batch read size
    sessionReloadReadSize = 100
    # async, sync
    flushDiskMode = async
  }
 
  ## database store property
  ## 数据库存储的配置属性
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
    datasource = "dbcp"
    ## mysql/oracle/h2/oceanbase etc.
    dbType = "mysql"
    driverClassName = "com.mysql.jdbc.Driver"
    url = "jdbc:mysql://127.0.0.1:3306/seata"
    user = "mysql"
    password = "mysql"
    minConn = 1
    maxConn = 10
    globalTable = "global_table" # db模式全局事务表名
    branchTable = "branch_table" # db模式分支事务表名
    lockTable = "lock_table" # db模式全局锁表名
    queryLimit = 100 # db模式查询全局事务一次的最大条数
  }
}
## server configuration, only used in server side
# server服务端配置
server {
  recovery {
    #schedule committing retry period in milliseconds
# 两阶段提交未完成状态全局事务重试提交线程间隔时间
    committingRetryPeriod = 1000
    #schedule asyn committing retry period in milliseconds
# 两阶段异步提交状态重试提交线程间隔时间
    asynCommittingRetryPeriod = 1000
    #schedule rollbacking retry period in milliseconds
#两阶段回滚状态重试回滚线程间隔时间
    rollbackingRetryPeriod = 1000
    #schedule timeout retry period in milliseconds
#超时状态监测重试线程间隔时间
    timeoutRetryPeriod = 1000
  }
  undo {
# undo保留天数
    logSaveDays = 7
    #schedule delete expired undo_log in milliseconds
#undo清理线程间隔时间(ms)
    logDeletePeriod = 86400000
  }
  #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
  maxCommitRetryTimeout = "-1"
  maxRollbackRetryTimeout = "-1"
  rollbackRetryTimeoutUnlockEnable = false
}
 
## metrics configuration, only used in server side
## 监控设置
metrics {
  # 是否启动
  enabled = false
  # 指标注册器类型
  registryType = "compact"
  # multi exporters use comma divided
  # 指标结果prometheus数据输出器列表
  exporterList = "prometheus"
  # prometheus输出器Client端口号
  exporterPrometheusPort = 9898
}