【Canal】Canal集群实践

你在学习数据库相关的知识吗？本文《【Canal】Canal集群实践》，主要介绍的内容就涉及到MySQL、Elasticsearch、rocketmq、canal、zookeeper，如果你想提升自己的开发能力，就不要错过这篇文章，大家要知道编程理论基础和实战操作都是不可或缺的哦！

一、前言

Canal是alibaba开源的中间件，纯java开发，是一个用来数据同步的数据管道，它将自己伪装成mysql的slaver，具备解析bin log的能力，为下游增量同步业务提供服务。Canal可以多个节点结合zookeeper组成高可用集群，Canal集群中同时只有一个active状态的节点用来解析（多线程）bin log，如果有节点退出，之前节点已经解析完成的解析位点和消费位点会同步到zookeeper，另外的节点就会顶上去继续解析bin log（从zookeeper读取解析位点和消费位点），为下游客户端提供服务。
以下将搭建一个Canal高可用集群并将解析的bin log直接投递消息到阿里云RocketMQ，供业务消费者消费。完成mysql数据增量同步到Elasticsearch的任务。

• 参考官方wiki

二、集群搭建资源准备

1、mysql准备

• 需要准备mysql服务标的

说明：存在两个数据库实例，以下实践Canal需要同时监听多个库。

• 数据库明文密码采用druid加密

D:\yyw_mvn_repo\repository\com\alibaba\druid\1.1.21>java -cp druid-1.1.21.jar com.alibaba.druid.filter.config.ConfigTools d41d8cd98f00b204
privateKey:MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEAmmWRWcOG/HlVwLsN4FpnaOaQVKPAdvJBU5b24EVo0UHwLf8W08nqBr+DbTgKH3idgLtK0WURps4kFlGQKtOcEQIDAQABAkAmDeyiXD/0EI/jPfdwmbetMk7Wnbm9V35kdOwKYPExyhWtYjJlrBrRXJH+cafCEov13UvFpB5PO5PnUJLnqeoVAiEAzsb5W74wj6yc8En+DBwhI9Yd/HD40orl+U8wuhvmprMCIQC/JoVs28aj2YzphvtzeGCuxKIxeFcCqE9iybhHzIH0KwIgJlGnSkIfm7CAUONVagcYeRyn5+1DnzjQT3hGbmbXQpMCIQCKP2sKk110TbirgXPFTM/oNtDzpIyRoHdiBHDihNeMZwIhAIpE+nSOCNIWfbpc/ysOfTF/0iMqdHug3eo3HrYY75ht
publicKey:MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJplkVnDhvx5VcC7DeBaZ2jmkFSjwHbyQVOW9uBFaNFB8C3/FtPJ6ga/g204Ch94nYC7StFlEabOJBZRkCrTnBECAwEAAQ==
password:KbOYWBV9y9OFRVcegHMdkyPtV4vBDSahBsRRxXzvLfCUQLdhVJd5Tif571EHvM0EuBwJLmr+6LkR92KxNs4heg==

• druid加解密测试

    /**
     * druid加解密测试
     * @throws Exception
     */
    @Test
    public void druidDecryptTest() throws Exception {
        //私钥
        String privateKey = "MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEAmmWRWcOG/HlVwLsN4FpnaOaQVKPAdvJBU5b24EVo0UHwLf8W08nqBr+DbTgKH3idgLtK0WURps4kFlGQKtOcEQIDAQABAkAmDeyiXD/0EI/jPfdwmbetMk7Wnbm9V35kdOwKYPExyhWtYjJlrBrRXJH+cafCEov13UvFpB5PO5PnUJLnqeoVAiEAzsb5W74wj6yc8En+DBwhI9Yd/HD40orl+U8wuhvmprMCIQC/JoVs28aj2YzphvtzeGCuxKIxeFcCqE9iybhHzIH0KwIgJlGnSkIfm7CAUONVagcYeRyn5+1DnzjQT3hGbmbXQpMCIQCKP2sKk110TbirgXPFTM/oNtDzpIyRoHdiBHDihNeMZwIhAIpE+nSOCNIWfbpc/ysOfTF/0iMqdHug3eo3HrYY75ht";
        //公钥
        String publicKey = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJplkVnDhvx5VcC7DeBaZ2jmkFSjwHbyQVOW9uBFaNFB8C3/FtPJ6ga/g204Ch94nYC7StFlEabOJBZRkCrTnBECAwEAAQ==";
        //密文密码
        String password = "KbOYWBV9y9OFRVcegHMdkyPtV4vBDSahBsRRxXzvLfCUQLdhVJd5Tif571EHvM0EuBwJLmr+6LkR92KxNs4heg==";
        //druid解密
        log.info("ConfigTools.decrypt:{}", ConfigTools.decrypt(publicKey, password));
        //druid加密
        log.info("ConfigTools.encrypt:{}", ConfigTools.encrypt(privateKey, "d41d8cd98f00b204"));
    }

mysql服务必须开启bin log支持

• 修改mysql配置文件my.cnf

[mysqld]  
#开启bin log  
log-bin=mysql-bin 

#选择row模式  
binlog-format=ROW 

#配置mysql replaction需要定义，不能和canal的slaveId重复  
server_id=1 

说明：Canal的原理是基于mysql binlog技术，所以这里一定需要开启mysql的binlog写入功能，并且配置binlog模式为row。

• 验证mysql配置文件my.cnf

mysql> show variables like 'binlog_format';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| binlog_format | ROW   |
+---------------+-------+

mysql> show variables like 'log_bin';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin       | ON    |
+---------------+-------+

准备一个具备复制相关权限的mysql用户

#创建用户
CREATE USER b2c IDENTIFIED BY 'd41d8cd98f00b204';    

#授予slaver复制所需的相关权限
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'b2c'@'%';  
-- GRANT ALL PRIVILEGES ON *.* TO 'b2c'@'%' ;  

#刷新权限，使得创建的用户权限生效
FLUSH PRIVILEGES; 

#查看用户被授予的权限
show grants for 'b2c'

2、zookeeper准备

Canal高可用集群依赖于zookeeper作为统一协调者，各个Canal server信息、Canal client信息、解析位点、消费位点会写入zookeeper；Canal客户端直接从zookeeper获取Canal服务端信息来消费，zk统一协调，保证只有一个Canal server处于激活状态。

• zookeeper节点地址

zk1.test.yiyaowang.com:2181,zk2.test.yiyaowang.com:2181,zk3.test.yiyaowang.com:2181

3、RocketMQ准备

• MQ的TOPIC和GID准备

说明Canal高可用集群并将解析的bin log直接投递消息到阿里云RocketMQ，供业务消费者消费。完成mysql数据增量同步到Elasticsearch的任务。

4、canal机器准备

三、Canal集群搭建及RocketMQ消息投递

1、Canal下载

• 直接下载，官网下载链接

• wget方式获取

#以v1.1.5-alpha-2版本为例
wget https://github.com/alibaba/canal/releases/download/canal-1.1.5-alpha-2/canal.deployer-1.1.5-SNAPSHOT.tar.gz

• 编译源码

git clone git@github.com:alibaba/canal.git
git co canal-$version #切换到对应的版本上
mvn clean install -Denv=release

说明：执行完成后，会在canal工程根目录下生成一个target目录，里面会包含一个 canal.deployer-$verion.tar.gz

• canal deployer的目录结构

drwxr-xr-x. 2 root root   76 Sep  4 13:11 bin   #启停脚本
drwxr-xr-x. 5 root root  130 Sep  4 13:28 conf  #配置文件
drwxr-xr-x. 2 root root 4096 Sep  3 15:03 lib   #依赖库
drwxrwxrwx. 4 root root   41 Sep  3 16:16 logs  #日志目录

• 解压Canal程序包

#解压canal程序包至指定文件夹
mkdir /usr/local/canal
tar zxvf /usr/local/canal.deployer-1.1.4.tar.gz  -C /usr/local/canal

#从当前机器（10.6.123.33）拷贝canal文件夹至另一台机器（10.6.85.15）的/usr/local目录下
scp -r /usr/local/canal root@10.6.85.15:/usr/local

2、Canal配置

[root@localhost conf]# pwd
/usr/local/canal/conf
[root@localhost conf]# ll
total 16
-rwxrwxrwx. 1 root root  291 Sep  2  2019 canal_local.properties
-rwxrwxrwx. 1 root root 5394 Sep  4 13:28 canal.properties
-rwxrwxrwx. 1 root root 3119 Sep  2  2019 logback.xml
drwxrwxrwx. 2 root root   39 Sep  3 15:03 metrics
drwxrwxrwx. 2 root root   49 Sep  4 11:38 order_instance
drwxrwxrwx. 3 root root  149 Sep  3 15:03 spring

我们需要配置的文件基本就只有canal.properties以及我们自定义的instance.properties，每个canal server都可以加载多个instance.properties，每个instance实例可以向一个mysql实例同步bin log，也就是说canal支持多个rdb库的同步业务需求。默认配置下Canal会自动扫描conf目录下我们自定义的目录（如：order_instance），并加载改目录下的instance.properties来启动一个instance实例。

• 配置系统canal.properties，所有instance实例公用，可被instance配置覆盖

#################################################
#########         common argument        #############
#################################################
# canal server绑定的本地IP信息，如果不配置，默认选择一个本机IP进行启动服务
canal.ip = 10.6.123.33
# canal server注册到外部zookeeper、admin的ip信息
canal.register.ip = 10.6.123.33
# canal server提供socket服务的端口
canal.port = 11111
canal.metrics.pull.port = 11112
# canal instance user/passwd
# canal.user = canal
# canal.passwd = E3619321C1A937C46A0D8BD1DAC39F93B27D4458

# canal admin config
#canal.admin.manager = 127.0.0.1:8089
canal.admin.port = 11110
canal.admin.user = admin
canal.admin.passwd = 4ACFE3202A5FF5CF467898FC58AAB1D615029441

#canal server链接zookeeper集群的链接信息
canal.zkServers = zk1.test.yiyaowang.com:2181,zk2.test.yiyaowang.com:2181,zk3.test.yiyaowang.com:2181
# flush data to zk
canal.zookeeper.flush.period = 1000
canal.withoutNetty = false
# 服务模式，包括tcp（canal客户端）, kafka（直接投递消息到kafka）, RocketMQ（直接投递消息到RocketMQ）
canal.serverMode = RocketMQ
# flush meta cursor/parse position to file
canal.file.data.dir = ${canal.conf.dir}
canal.file.flush.period = 1000
## memory store RingBuffer size, should be Math.pow(2,n)
canal.instance.memory.buffer.size = 16384
## memory store RingBuffer used memory unit size , default 1kb
canal.instance.memory.buffer.memunit = 1024 
## meory store gets mode used MEMSIZE or ITEMSIZE
canal.instance.memory.batch.mode = MEMSIZE
canal.instance.memory.rawEntry = true

## detecing config
canal.instance.detecting.enable = false
#canal.instance.detecting.sql = insert into retl.xdual values(1,now()) on duplicate key update x=now()
canal.instance.detecting.sql = select 1
canal.instance.detecting.interval.time = 3
canal.instance.detecting.retry.threshold = 3
canal.instance.detecting.heartbeatHaEnable = false

# support maximum transaction size, more than the size of the transaction will be cut into multiple transactions delivery
canal.instance.transaction.size =  1024
# mysql fallback connected to new master should fallback times
canal.instance.fallbackIntervalInSeconds = 60

# network config
canal.instance.network.receiveBufferSize = 16384
canal.instance.network.sendBufferSize = 16384
canal.instance.network.soTimeout = 30

# binlog filter config
canal.instance.filter.druid.ddl = true
canal.instance.filter.query.dcl = false
canal.instance.filter.query.dml = false
canal.instance.filter.query.ddl = false
canal.instance.filter.table.error = false
canal.instance.filter.rows = false
canal.instance.filter.transaction.entry = false

# binlog format/image check
canal.instance.binlog.format = ROW,STATEMENT,MIXED 
canal.instance.binlog.image = FULL,MINIMAL,NOBLOB

# binlog ddl isolation
canal.instance.get.ddl.isolation = false

# parallel parser config
canal.instance.parser.parallel = true
## concurrent thread number, default 60% available processors, suggest not to exceed Runtime.getRuntime().availableProcessors()
canal.instance.parser.parallelThreadSize = 4
## disruptor ringbuffer size, must be power of 2
canal.instance.parser.parallelBufferSize = 256

# table meta tsdb info
canal.instance.tsdb.enable = true
canal.instance.tsdb.dir = ${canal.file.data.dir:../conf}/${canal.instance.destination:}
canal.instance.tsdb.url = jdbc:h2:${canal.instance.tsdb.dir}/h2;CACHE_SIZE=1000;MODE=MYSQL;
canal.instance.tsdb.dbUsername = canal
canal.instance.tsdb.dbPassword = canal
# dump snapshot interval, default 24 hour
canal.instance.tsdb.snapshot.interval = 24
# purge snapshot expire , default 360 hour(15 days)
canal.instance.tsdb.snapshot.expire = 360

# aliyun账号的ak/sk信息，如果使用阿里云的RocketMQ服务必填, support rds/mq
canal.aliyun.accessKey = xxxxxxxxxxxxxxxxxxxxxx
canal.aliyun.secretKey = xxxxxxxxxxxxxxxxxxxxxx

#################################################
#########         destinations        #############
#################################################
#当前server上部署的instance列表,不配置自动探测
canal.destinations = 
# conf root dir
canal.conf.dir = ../conf
# 开启instance自动扫描，如果配置为true，canal.conf.dir目录下的instance配置变化会自动触发：  
# a. instance目录新增： 触发instance配置载入，lazy为true时则自动启动  
# b. instance目录删除：卸载对应instance配置，如已启动则进行关闭  
# c. instance.properties文件变化：reload instance配置，如已启动自动进行重启操作
canal.auto.scan = true
#instance自动扫描的间隔时间，单位秒
canal.auto.scan.interval = 5

canal.instance.tsdb.spring.xml = classpath:spring/tsdb/h2-tsdb.xml
#canal.instance.tsdb.spring.xml = classpath:spring/tsdb/mysql-tsdb.xml

canal.instance.global.mode = spring
canal.instance.global.lazy = false
canal.instance.global.manager.address = ${canal.admin.manager}
#canal.instance.global.spring.xml = classpath:spring/memory-instance.xml
#canal.instance.global.spring.xml = classpath:spring/file-instance.xml
canal.instance.global.spring.xml = classpath:spring/default-instance.xml

##################################################
#########              MQ              #############
##################################################
#阿里云RocketMQ服务实例的TCP协议客户端接入点
canal.mq.servers = onsaddr.mq-internet-access.mq-internet.aliyuncs.com:80
canal.mq.retries = 0
canal.mq.batchSize = 16384
canal.mq.maxRequestSize = 1048576
canal.mq.lingerMs = 100
canal.mq.bufferMemory = 33554432
canal.mq.canalBatchSize = 50
canal.mq.canalGetTimeout = 100
canal.mq.flatMessage = true
canal.mq.compressionType = none
canal.mq.acks = all
#canal.mq.properties. =
#canal.mq.producerGroup = 
# Set this value to "cloud", if you want open message trace feature in aliyun.
canal.mq.accessChannel = cloud
# aliyun mq namespace
#canal.mq.namespace =

##################################################
#########     Kafka Kerberos Info    #############
##################################################
canal.mq.kafka.kerberos.enable = false
canal.mq.kafka.kerberos.krb5FilePath = "../conf/kerberos/krb5.conf"
canal.mq.kafka.kerberos.jaasFilePath = "../conf/kerberos/jaas.conf"

• 在conf目录下自定义目录（如：order_instance）并创建instance.properties

#################################################
## mysql serverId , v1.0.26+ will autoGen
# canal.instance.mysql.slaveId=0

# enable gtid use true/false
canal.instance.gtidon=false

# position info
canal.instance.master.address=mysql2.test.yiyaowang.com:3306
canal.instance.master.journal.name=
canal.instance.master.position=
canal.instance.master.timestamp=
canal.instance.master.gtid=

# rds oss binlog
canal.instance.rds.accesskey=
canal.instance.rds.secretkey=
canal.instance.rds.instanceId=

# table meta tsdb info
canal.instance.tsdb.enable=true
#canal.instance.tsdb.url=jdbc:mysql://127.0.0.1:3306/canal_tsdb
#canal.instance.tsdb.dbUsername=canal
#canal.instance.tsdb.dbPassword=canal

#canal.instance.standby.address =
#canal.instance.standby.journal.name =
#canal.instance.standby.position =
#canal.instance.standby.timestamp =
#canal.instance.standby.gtid=

# username/password
canal.instance.dbUsername=yc_order
# 密文密码
canal.instance.dbPassword=KbOYWBV9y9OFRVcegHMdkyPtV4vBDSahBsRRxXzvLfCUQLdhVJd5Tif571EHvM0EuBwJLmr+6LkR92KxNs4heg==
canal.instance.connectionCharset = UTF-8
# 开启druid的加解密方式支持
canal.instance.enableDruid=true
# druid公钥
canal.instance.pwdPublicKey=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJplkVnDhvx5VcC7DeBaZ2jmkFSjwHbyQVOW9uBFaNFB8C3/FtPJ6ga/g204Ch94nYC7StFlEabOJBZRkCrTnBECAwEAAQ==

# table regex
canal.instance.filter.regex=yc_order\\.t_order,yc_order\\.t_order_detail,yc_order\\.t_order_child,yc_order\\.t_order_delivery,yc_order\\.t_system_pay_type,yc_order\\.t_order_exception
# table black regex
canal.instance.filter.black.regex=
# table field filter(format: schema1.tableName1:field1/field2,schema2.tableName2:field1/field2)
#canal.instance.filter.field=test1.t_product:id/subject/keywords,test2.t_company:id/name/contact/ch
# table field black filter(format: schema1.tableName1:field1/field2,schema2.tableName2:field1/field2)
#canal.instance.filter.black.field=test1.t_product:subject/product_image,test2.t_company:id/name/contact/ch

# mq config
canal.mq.topic= TOPIC_ORDER_ES_DATA_SYNC_TEST
canal.mq.producerGroup = GID_ORDER_ES_DATA_SYNC_TEST
#canal.mq.namespace = 
# dynamic topic route by schema or table regex
#canal.mq.dynamicTopic=mytest1.user,mytest2\\..*,.*\\..*
canal.mq.partition=0
# hash partition config
#canal.mq.partitionsNum=3
#canal.mq.partitionHash=test.table:id^name,.*\\..*
#################################################

3、Canal相关命令与状态

Canal相关命令

• 启动canal

sh bin/startup.sh

• 停止canal

sh bin/stop.sh

• 查看日志

# 以order_instance实例日志为例
[root@localhost order_instance]# tail -f -n 500 logs/order_instance/order_instance.log
2020-09-03 16:16:19.143 [canal-instance-scan-0] INFO  c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [canal.properties]
2020-09-03 16:16:19.183 [canal-instance-scan-0] INFO  c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [order_instance/instance.properties]
2020-09-03 16:16:20.751 [canal-instance-scan-0] WARN  o.s.beans.GenericTypeAwarePropertyDescriptor - Invalid JavaBean property 'connectionCharset' being accessed! Ambiguous write methods found next to actually used [public void com.alibaba.otter.canal.parse.inbound.mysql.AbstractMysqlEventParser.setConnectionCharset(java.lang.String)]: [public void com.alibaba.otter.canal.parse.inbound.mysql.AbstractMysqlEventParser.setConnectionCharset(java.nio.charset.Charset)]
2020-09-03 16:16:21.160 [canal-instance-scan-0] INFO  c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [canal.properties]
2020-09-03 16:16:21.161 [canal-instance-scan-0] INFO  c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [order_instance/instance.properties]
2020-09-03 16:16:21.649 [canal-instance-scan-0] INFO  c.a.otter.canal.instance.spring.CanalInstanceWithSpring - start CannalInstance for 1-order_instance 
2020-09-03 16:16:21.660 [canal-instance-scan-0] WARN  c.a.o.canal.parse.inbound.mysql.dbsync.LogEventConvert - --> init table filter : ^yc_order\.t_system_pay_type$|^yc_order\.t_order_exception$|^yc_order\.t_order_delivery$|^yc_order\.t_order_detail$|^yc_order\.t_order_child$|^yc_order\.t_order$
2020-09-03 16:16:21.660 [canal-instance-scan-0] WARN  c.a.o.canal.parse.inbound.mysql.dbsync.LogEventConvert - --> init table black filter : 
2020-09-03 16:16:21.675 [canal-instance-scan-0] INFO  c.a.otter.canal.instance.core.AbstractCanalInstance - start successful....
2020-09-03 16:16:21.757 [destination = order_instance , address = mysql2.test.yiyaowang.com/10.6.168.14:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - ---> begin to find start position, it will be long time for reset or first position
2020-09-03 16:16:21.761 [destination = order_instance , address = mysql2.test.yiyaowang.com/10.6.168.14:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - prepare to find start position just show master status
2020-09-03 16:16:26.312 [destination = order_instance , address = mysql2.test.yiyaowang.com/10.6.168.14:3306 , EventParser] WARN  c.a.o.c.p.inbound.mysql.rds.RdsBinlogEventParserProxy - ---> find start position successfully, EntryPosition[included=false,journalName=mysql-bin.000571,position=283581902,serverId=168252,gtid=,timestamp=1599120981000] cost : 4543ms , the next step is binlog dump

说明：如果是canal集群，只会看到一台机器上出现了启动成功的日志。因为canal集群中的各个节点仅有一个节点是处于active激活状态的。

Canal集群注册状态

分别启动所有canal节点，观察zookeeper中的状态，zk会记录已经注册的所有canal server节点信息、当前运行的节点具体信息、消费节点信息。

• zookeeper中的注册状态

• 当前运行节点信息

{"active":true,"address":"10.6.123.33:11111"}

• 消费位点信息

# 数据消费成功后，canal server会在zookeeper中记录下当前最后一次消费成功的binlog位点.  
# (下次你重启client时，会从这最后一个位点继续进行消费)
{  
 "@type":"com.alibaba.otter.canal.protocol.position.LogPosition",  
 "identity":{  
        "slaveId":-1,  
        "sourceAddress":{  
            "address":"mysql2.test.yiyaowang.com",  
            "port":3306  
        }  
    },  
 "postion":{  
        "gtid":"",  
        "included":false,  
        "journalName":"mysql-bin.000573",  
        "position":308524409,  
        "serverId":168252,  
        "timestamp":1599205987000  
    }  
}

四、Canal admin可视化配置管理

canal-admin设计上是为canal提供整体配置管理、节点运维等面向运维的功能，提供相对友好的WebUI操作界面，方便更多用户快速和安全的操作。

• 参考官方详细wiki
• 下载软件包

# 以 1.1.4 版本为例
wget https://github.com/alibaba/canal/releases/download/canal-1.1.4/canal.admin-1.1.4.tar.gz

• 解压缩到指定位置

mkdir /usr/local/canal-admin
tar zxvf canal.admin-1.1.4.tar.gz  -C /usr/local/canal-admin

• 修改conf目录下application.yml

server:
  port: 8089
spring:
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss
    time-zone: GMT+8

spring.datasource:
  address: 127.0.0.1:3306
  database: canal_manager
  username: canal
  password: canal
  driver-class-name: com.mysql.jdbc.Driver
  url: jdbc:mysql://${spring.datasource.address}/${spring.datasource.database}?useUnicode=true&characterEncoding=UTF-8&useSSL=false
  hikari:
    maximum-pool-size: 30
    minimum-idle: 1

canal:
  adminUser: admin
  adminPasswd: admin

• 初始化canal-admin依赖的mysql scheme

mysql -h127.1 -uroot -p

# 导入初始化SQL
source conf/canal_manager.sql

• 启动canal-admin

# 成功启动canal-admin，可以通过http://127.0.0.1:8089访问，默认密码：admin/123456
sh bin/startup.sh

• 修改canal server的canal_local.properties配置

# register ip
canal.register.ip =

# canal admin config
canal.admin.manager = 127.0.0.1:8089
canal.admin.port = 11110
canal.admin.user = admin
canal.admin.passwd = 4ACFE3202A5FF5CF467898FC58AAB1D615029441
# admin auto register
canal.admin.register.auto = true
#如果通过canal-admin管理canal集群，那么此处指定的集群名称必须在canal-admin中提前创建
canal.admin.register.cluster = canal-es-data-sync-cluster

• 指定读取canal_local.properties配置方式启动canal server

sh bin/startup.sh local

说明：canal配置交给canal-admin管理后，只需要配置canal_local.properties文件中的关于和canal-admin通信的几个配置即可，canal server会从canal-admin读取配置。

说明：成功启动canal-admin后，可配置canal集群，集群下server、server下instance。

五、客户端接入

当前最新稳定版本（1.1.4）的canal server支持tcp模式（canal client）、kafka消息投递、RocketMQ消息投递等方式

消费Canal投递的RocketMQ消息方式

• 消息格式如下

{
    "data":[
        {
            "order_id":"1",
            "flow_id":"XXD20181123155734506823",
            "cust_name":"测试更新abcd",
            "cust_id":"8366",
            "supply_name":"广东壹号药业有限公司",
            "supply_id":"8353",
        }
    ],
    "database":"yc_order",
    "es":1599189063000,
    "id":38,
    "isDdl":false,
    "mysqlType":{
        "order_id":"int(11)",
        "flow_id":"varchar(50)",
        "cust_name":"varchar(150)",
        "cust_id":"int(11)",
        "supply_name":"varchar(150)",
        "supply_id":"int(11)",
    },
    "old":[
        {
            "cust_name":"测试更新abc"
        }
    ],
    "pkNames":[
        "order_id"
    ],
    "sql":"",
    "sqlType":{
        "order_id":4,
        "flow_id":12,
        "cust_name":12,
        "cust_id":4,
        "supply_name":12,
        "supply_id":4,
    },
    "table":"t_order",
    "ts":1599189064173,
    "type":"UPDATE"
}

• 消息数据模型

package com.gangling.b2border.obs.search.rocketmq.model;  
    
import java.io.Serializable;  
import java.util.List;  
  
/**  
 * 消费canal消息的数据载体  
 */  
public class CanalMessageDTO implements Serializable {  
  
 /**  
 * 消息数据  
 */  
 private String data;  
  
 /**  
 * 数据库名称  
 */  
 private String database;  
  
 private Long es;  
  
 /**  
 * 递增，从1开始  
 */  
 private Integer id;  
  
 /**  
 * 是否是DDL语句  
 */  
 private boolean isDdl;  
  
 /**  
 * 表结构的字段类型  
 */  
 private String mysqlType;  
  
 /**  
 * UPDATE语句，旧数据  
 */  
 private String old;  
  
 /**  
 * 主键名称  
 */  
 private List<string> pkNames;  
  
 /**  
 * sql语句  
 */  
 private String sql;  
  
 private String sqlType;  
  
 /**  
 * 表名  
 */  
 private String table;  
  
 private Long ts;  
  
 /**  
 * (新增)INSERT、(更新)UPDATE、(删除)DELETE等等  
 */  
 private String type;  
}</string>

以上就是本文的全部内容了，是否有顺利帮助你解决问题？若是能给你带来学习上的帮助，请大家多多支持golang学习网！更多关于数据库的相关知识，也可关注golang学习网公众号。