canal 入门（基于docker）&& mysql install 第一步：安装MySQL：(可以参考:https://my.oschina.net/amhuman/blog/1941540)

 第一步：安装MySQL：(可以参考:https://my.oschina.net/amhuman/blog/1941540)

    命令：       

sudo docker run -it -d --restart unless-stopped -p 13306:3306 -h mysql --name mysql -e MYSQL_ROOT_PASSWORD=root
alanpeng/mysql5.7-replication-docker

 

查看mysql 容器的id

sudo docker
inspect
[容器id]

 

开启MySQL 的binlog

（如果不是在docker中 vi /etc/mysql/my.cnf） 

   vi   /etc/mysql/mysql.conf.d/mysqld.cnf

 

添加：

  cd /etc/mysql

[mysqld]
log-bin=mysql-bin #添加这一行就ok
binlog-format=ROW #选择row模式
server_id=1 #配置mysql replaction需要定义，不能和canal的slaveId重复
#配置表名字不区分大小写
lower_case_table_names=1

＃sql 的模式//可以不操作

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

授权root 用户可以远程访问（运行sql）

grant all privileges
on *.* to root@'%' identified by "root";
flush privileges;

 

第二步：安装canal

2.1 命令：

 sudo docker run
-it
-d
--restart unless-stopped
-p 11111:11111
canal/canal-server 

 

2.2 进入容器

  sudo docker exec -it  [id]

 

2.3修改配置修改

 

应用参数：（参照：https://github.com/alibaba/canal/wiki/QuickStart）

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 = ...

#################################################

第三步：写一个java springboot项目，消费benlog
pom依赖：

<dependency>
<groupId>com.alibaba.otter</groupId>
<artifactId>canal.client</artifactId>
<version>1.1.0</version>
</dependency>

 

写一个Test 方法：

package com.icil.canal;
import java.net.InetSocketAddress;
import java.util.List;
import org.springframework.core.env.SystemEnvironmentPropertySource;
import com.alibaba.otter.canal.client.CanalConnector;
import com.alibaba.otter.canal.client.CanalConnectors;
import com.alibaba.otter.canal.common.utils.AddressUtils;
import com.alibaba.otter.canal.protocol.CanalEntry.Column;
import com.alibaba.otter.canal.protocol.CanalEntry.Entry;
import com.alibaba.otter.canal.protocol.CanalEntry.EntryType;
import com.alibaba.otter.canal.protocol.CanalEntry.EventType;
import com.alibaba.otter.canal.protocol.CanalEntry.RowChange;
import com.alibaba.otter.canal.protocol.CanalEntry.RowData;
import com.alibaba.otter.canal.protocol.Message;
public class SimpleCanalClientExample {
public static void main(String args[]) {
// 创建链接
//
CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(),11111), "example", "", "");
CanalConnector connector = CanalConnectors.newSingleConnector(new InetSocketAddress(AddressUtils.getHostIp(),11111), "seatest", "", "");
System.err.println(AddressUtils.getHostIp());
int batchSize = 1000;
int emptyCount = 0;
try {
connector.connect();
connector.subscribe(".*\..*");
connector.rollback();
int totalEmptyCount = 120;
while (emptyCount < totalEmptyCount) {
Message message = connector.getWithoutAck(batchSize); // 获取指定数量的数据
long batchId = message.getId();
int size = message.getEntries().size();
if (batchId == -1 || size == 0) {
emptyCount++;
System.out.println("empty count : " + emptyCount);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
} else {
emptyCount = 0;
// System.out.printf("message[batchId=%s,size=%s] n", batchId, size);
//打印变换的数据

printEntry(message.getEntries());
}
connector.ack(batchId); // 提交确认
// connector.rollback(batchId); // 处理失败, 回滚数据

}
System.out.println("empty too many times, exit");
} finally {
connector.disconnect();
}
}
//打印变化的数据
private static void printEntry(List<Entry> entrys) {
for (Entry entry : entrys) {
//表示在一个事务中的数据
if (entry.getEntryType() == EntryType.TRANSACTIONBEGIN || entry.getEntryType() == EntryType.TRANSACTIONEND) {
continue;
}
RowChange rowChage = null;
try {
//获取每一行的数据
rowChage = RowChange.parseFrom(entry.getStoreValue());
} catch (Exception e) {
throw new RuntimeException("ERROR ## parser of eromanga-event has an error , data:" + entry.toString(),
e);
}
//获取时间类型// update insert delete
EventType eventType = rowChage.getEventType();
System.out.println(String.format("================&gt; binlog[%s:%s] , name[%s,%s] , eventType : %s",
entry.getHeader().getLogfileName(), entry.getHeader().getLogfileOffset(),
entry.getHeader().getSchemaName(), entry.getHeader().getTableName(),
eventType));
for (RowData rowData : rowChage.getRowDatasList()) {
if (eventType == EventType.DELETE) {
printColumn(rowData.getBeforeColumnsList());
} else if (eventType == EventType.INSERT) {
printColumn(rowData.getAfterColumnsList());
} else {
System.out.println("----改变之前---&gt; before");
printColumn(rowData.getBeforeColumnsList());
System.out.println("----修改之后---&gt; after");
printColumn(rowData.getAfterColumnsList());
}
}
}
}
private static void printColumn(List<Column> columns) {
for (Column column : columns) {
System.out.println(column.getName() + " : " + column.getValue() + "
update=" + column.getUpdated());
}
}
}

 

配置多个instans : (复制 example ,删除 h2.mv.db
和
meta,dat ,避免出现找不到 初始位置问题)