简介

image.png

canal [kə'næl],译意为水道/管道/沟渠,主要用途是基于 MySQL 数据库增量日志解析,提供增量数据订阅和消费

工作原理

canal 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)

安装

下载canal.deployer

地址:https://github.com/alibaba/ca...

准备

对于自建 MySQL , 需要先开启 Binlog 写入功能,配置 binlog-format 为 ROW 模式,my.cnf 中配置如下

[mysqld]<br/>
log-bin=mysql-bin # 开启 binlog<br/>
binlog-format=ROW # 选择 ROW 模式<br/>
server_id=1 # 配置 MySQL replaction 需要定义,不要和 canal 的 slaveId 重复<br/>
注意:针对阿里云 RDS for MySQL , 默认打开了 binlog , 并且账号默认具有 binlog<br/>

dump 权限 , 不需要任何权限或者 binlog 设置,可以直接跳过这一步<br/>
授权 canal 链接 MySQL 账号具有作为 MySQL slave 的权限, 如果已有账户可直接 grant<br/>

CREATE USER canal IDENTIFIED BY 'canal'; <br/>
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON . TO 'canal'@'%';<br/>
-- GRANT ALL PRIVILEGES ON . TO 'canal'@'%' ;<br/>
FLUSH PRIVILEGES;<br/>

启动

下载 canal, 访问 release 页面 , 选择需要的包下载, 如以 1.0.17 版本为例

wget https://github.com/alibaba/ca...

解压缩

mkdir /tmp/canal
tar zxvf canal.deployer-$version.tar.gz -C /tmp/canal

解压完成后,进入 /tmp/canal 目录,可以看到如下结构
drwxr-xr-x 2 jianghang jianghang  136 2013-02-05 21:51 bin
drwxr-xr-x 4 jianghang jianghang  160 2013-02-05 21:51 conf
drwxr-xr-x 2 jianghang jianghang 1.3K 2013-02-05 21:51 lib
drwxr-xr-x 2 jianghang jianghang   48 2013-02-05 21:29 logs

配置修改

vi conf/example/instance.properties

##mysql serverId
canal.instance.mysql.slaveId = 1234
#position info,需要改成自己的数据库信息
canal.instance.master.address = 127.0.0.1:3306 
canal.instance.master.journal.name = 
canal.instance.master.position = 
canal.instance.master.timestamp = 
#canal.instance.standby.address = 
#canal.instance.standby.journal.name =
#canal.instance.standby.position = 
#canal.instance.standby.timestamp = 
#username/password,需要改成自己的数据库信息
canal.instance.dbUsername = canal  
canal.instance.dbPassword = canal
canal.instance.defaultDatabaseName =
canal.instance.connectionCharset = UTF-8
#table regex
canal.instance.filter.regex = .\*\\\\..\*
canal.instance.connectionCharset 代表数据库的编码方式对应到 java 中的编码类型,比如 UTF-8,GBK , ISO-8859-1
如果系统是1个 cpu,需要将 canal.instance.parser.parallel 设置为 false

启动

sh bin/startup.sh

查看 server 日志

vi logs/canal/canal.log

2013-02-05 22:45:27.967 [main] INFO  com.alibaba.otter.canal.deployer.CanalLauncher - ## start the canal server.
2013-02-05 22:45:28.113 [main] INFO  com.alibaba.otter.canal.deployer.CanalController - ## start the canal server[10.1.29.120:11111]
2013-02-05 22:45:28.210 [main] INFO  com.alibaba.otter.canal.deployer.CanalLauncher - ## the canal server is running now ......

查看 instance 的日志

vi logs/example/example.log

2013-02-05 22:50:45.636 [main] INFO  c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [canal.properties]
2013-02-05 22:50:45.641 [main] INFO  c.a.o.c.i.spring.support.PropertyPlaceholderConfigurer - Loading properties file from class path resource [example/instance.properties]
2013-02-05 22:50:45.803 [main] INFO  c.a.otter.canal.instance.spring.CanalInstanceWithSpring - start CannalInstance for 1-example 
2013-02-05 22:50:45.810 [main] INFO  c.a.otter.canal.instance.spring.CanalInstanceWithSpring - start successful....

关闭

sh bin/stop.sh

--------------------------------文章来源 https://www.byteblogs.com/art...


exception
69 声望1 粉丝