canal工作原理
- canal 依靠mysql主从备份的原理，模拟 MySQL slave 的交互协议，伪装自己为 MySQL slave ，向 MySQL master 发送dump 协议
- MySQL master 收到 dump 请求，开始推送 binary log 给 slave (即 canal )
- canal 解析 binary log 对象(原始为 byte 流)
核心逻辑可见源码：
com.alibaba.otter.canal.parse.inbound.AbstractEventParser.java中start方法
配置mysql开启binlog日志
修改my.ini文件（如果是安装在windows上，文件目录默认是C:\ProgramData\MySQL\MySQL Server 5.7）
log-bin=D:\mysql-binlog\mysql-bin
binlog-format=ROW查看binlog日志开启状态
SHOW VARIABLES LIKE '%log_bin%';
查看binlog日志最新的日志文件及位置
SHOW MASTER STATUS
查询默认保存时间
SHOW VARIABLES LIKE 'expire_logs_days';
如果为0的话，则默认不清理binlog日志
安装部署canal-admin
canal-admin版本1.1.8，下载地址是https://github.com/alibaba/canal/releases/download/canal-1.1.8-alpha-2/canal.admin-1.1.8-SNAPSHOT.tar.gz
jdk版本是11.0.24 （ 如果是jdk8的话，会出现一些问题，以前走过的坑），可以去oracle官网下载
选择一个mysql数据库做为canal-admin的内置数据库
在数据库中执行conf目录下的canal_manager.sql 脚本文件
修改conf 目录下的application.yml配置文件，填写数据库信息
注意：adminPasswd是端口11110服务的密码，后续安装canal-deploye的时候会说到
在bin目录执行
sh startup.shweb服务默认的端口是8089，访问ip:8089
默认的用户名密码是：admin/123456，后续也可以修改密码
至此canal-admin已经搭建完毕
安装部署 canal.deployer
canal-deployer版本1.1.8，下载地址是
https://github.com/alibaba/canal/releases/download/canal-1.1.8-alpha-2/canal.deployer-1.1.8-SNAPSHOT.tar.gz
修改conf下的canal.properties
#################################################
######### common argument #############
#################################################
# tcp bind ip
canal.ip = 172.18.10.27 // 本机ip即可
# register ip to zookeeper
canal.register.ip = 172.18.10.27 // 本机ip即可
canal.port = 11111
canal.metrics.pull.port = 11112
# canal instance user/passwd
# canal.user = canal
# canal.passwd =# canal admin config
canal.admin.manager = 172.18.10.27:8089 //这里是连接canal-admin服务的地址，这里由于canal-admin,canal-deployer安装在同一台服务器上
canal.admin.port = 11110
canal.admin.user = admin
canal.admin.passwd = 4ACFE3202A5FF5CF467898FC58AAB1D615029441 //这里就是在安装canal配置的adminPasswd密码，这里是admin，由于要配置加密的密码，可以去mysql中执行select password("admin"),把前面那个*去掉即可
# admin auto register
#canal.admin.register.auto = true
#canal.admin.register.cluster =
#canal.admin.register.name =canal.zkServers = dubbo1.mysteel.local:2181,dubbo2.mysteel.local:2182,dubbo3.mysteel.local:2183//填写zk服务
# flush data to zk
canal.zookeeper.flush.period = 1000
canal.withoutNetty = false
# tcp, kafka, rocketMQ, rabbitMQ, pulsarMQ
canal.serverMode = rabbitMQ //这里选择需要发布的服务类型，这里选择是rabbitMQ
# 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
canal.instance.filter.dml.insert = false
canal.instance.filter.dml.update = false
canal.instance.filter.dml.delete = 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 = 16
## disruptor ringbuffer size, must be power of 2
canal.instance.parser.parallelBufferSize = 256# table meta tsdb info
canal.instance.tsdb.enable = false
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#################################################
######### destinations #############
#################################################
canal.destinations = example
# conf root dir
canal.conf.dir = ../conf
# auto scan instance dir add/remove and start/stop instance
canal.auto.scan = true
canal.auto.scan.interval = 5
# set this value to 'true' means that when binlog pos not found, skip to latest.
# WARN: pls keep 'false' in production env, or if you know what you want.
canal.auto.reset.latest.pos.mode = falsecanal.instance.tsdb.spring.xml = classpath:spring/tsdb/h2-tsdb.xml
#canal.instance.tsdb.spring.xml = classpath:spring/tsdb/mysql-tsdb.xmlcanal.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 Properties #############
##################################################
# aliyun ak/sk , support rds/mq
canal.aliyun.accessKey =
canal.aliyun.secretKey =
canal.aliyun.uid=canal.mq.flatMessage = true
canal.mq.canalBatchSize = 50
canal.mq.canalGetTimeout = 100
# Set this value to "cloud", if you want open message trace feature in aliyun.
canal.mq.accessChannel = localcanal.mq.database.hash = true
canal.mq.send.thread.size = 30
canal.mq.build.thread.size = 8##################################################
######### Kafka #############
##################################################
kafka.bootstrap.servers = 127.0.0.1:9092
kafka.acks = all
kafka.compression.type = none
kafka.batch.size = 16384
kafka.linger.ms = 1
kafka.max.request.size = 1048576
kafka.buffer.memory = 33554432
kafka.max.in.flight.requests.per.connection = 1
kafka.retries = 0kafka.kerberos.enable = false
kafka.kerberos.krb5.file = ../conf/kerberos/krb5.conf
kafka.kerberos.jaas.file = ../conf/kerberos/jaas.conf# sasl demo
# kafka.sasl.jaas.config = org.apache.kafka.common.security.scram.ScramLoginModule required \\n username=\"alice\" \\npassword="alice-secret\";
# kafka.sasl.mechanism = SCRAM-SHA-512
# kafka.security.protocol = SASL_PLAINTEXT##################################################
######### RocketMQ #############
##################################################
rocketmq.producer.group = test
rocketmq.enable.message.trace = false
rocketmq.customized.trace.topic =
rocketmq.namespace =
rocketmq.namesrv.addr = 127.0.0.1:9876
rocketmq.retry.times.when.send.failed = 0
rocketmq.vip.channel.enabled = false
rocketmq.tag =##################################################
######### RabbitMQ #############
##################################################
rabbitmq.host = cyhlw01.mq.mysteel.local:5672
rabbitmq.virtual.host = /mysteel
rabbitmq.exchange = exchange_ebc_canal
rabbitmq.username = mysteeladmin
rabbitmq.password = mysteeladmin0411
rabbitmq.queue = queue_ebc_canal
rabbitmq.routingKey = queue_ebc_canal
rabbitmq.deliveryMode =//配置rabbitMQ 连接信息
##################################################
######### Pulsar #############
##################################################
pulsarmq.serverUrl =
pulsarmq.roleToken =
pulsarmq.topicTenantPrefix =
注意：canal.serverMode = rabbitMQ 由于选择的是rabbitMQ ，则需要把plugin/connector.rabbitmq-1.1.8-SNAPSHOT-jar-with-dependencies.jar的复制到lib目录，否则会出现问题
在bin目录执行
sh startup.sh有时候出现问题会出现闪退，可以在脚本文件最后加pause，便于排查问题
也可以在线修改配置信息，保存即可生效
canal.deployer中手动添加instance
这里需要在网页端配置instance，新建instance，选择对应的canal-server，在配置文件中添加监听的数据及监听规则
#################################################
## 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=app03.db.mysteel.local:3306 //监听的数据源
canal.instance.master.journal.name=mysql-bin.000025 //监听的数据源binlog文件
canal.instance.master.position=987721127//监听的数据源binlog文件起始位置
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=false //这里可以改为false，否则会出现一些错误
#canal.instance.tsdb.url=jdbc:mysql://127.0.0.1:3306/canal_manager
#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=crm_canal //监听的数据源用户名
canal.instance.dbPassword=4jRwhaDR5Q9h //监听的数据源密码
canal.instance.connectionCharset = UTF-8
# enable druid Decrypt database password
canal.instance.enableDruid=false
#canal.instance.pwdPublicKey=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBALK4BUxdDltRRE5/zXpVEVPUgunvscYFtEip3pmLlhrWpacX7y7GCMo2/JM6LeHmiiNdH1FWgGCpUfircSwlWKUCAwEAAQ==# table regex
canal.instance.filter.regex=dc_crm.72crm_crm_account,dc_crm.72crm_crm_contacts,dc_crm.72crm_crm_customer,dc_crm.crm_account_target,dc_crm.crm_product_package_ebc_frame,dc_crm.crm_dictionary,dc_crm.crm_product_module,dc_crm.crm_product_package_module,dc_crm.crm_product_package_indexcategory,dc_crm.crm_product_package,dc_crm.crm_account_product//监听的数据源匹配规则，如果有多个规则，则用“，”分隔，如上述要监听一个数据中多张表，则dc_crm.72crm_crm_account,dc_crm.72crm_crm_contacts
# 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=queue_ebc_canal //rabbitmq的routingKey
# dynamic topic route by schema or table regex
#canal.mq.dynamicTopic=mytest1.user,topic2:mytest2\\..*,.*\\..*
canal.mq.partition=0
# hash partition config
#canal.mq.enableDynamicQueuePartition=false
#canal.mq.partitionsNum=3
#canal.mq.dynamicTopicPartitionNum=test.*:4,mycanal:6
#canal.mq.partitionHash=test.table:id^name,.*\\..*
#
# multi stream for polardbx
canal.instance.multi.stream.on=false
#################################################
配置修改保存之后，会实时生效，不需要启停生效。
遇到的实际问题
1、被监听的mysql重装，或者binlog文件删除了，怎么重置canal中的binlog的文件及位置
在conf/instance/meta.dat保存着最新的binlog位置信息
{
"clientDatas": [
{
"clientIdentity": {
"clientId": 1001,
"destination": "instance",
"filter": ""
},
"cursor": {
"identity": {
"slaveId": -1,
"sourceAddress": {
"address": "app03.db.mysteel.local",
"port": 3306
}
},
"postion": {
"gtid": "",
"included": false,
"journalName": "mysql-bin.000049",
"position": 973390906,
"serverId": 1810141,
"timestamp": 1722923225000
}
}
}
],
"destination": "instance"
}
只需要修改journalName，position，timestamp即可
