使用docker搭建canal监听mysql表变化

1: 安装docker

2: docker下载mysql镜像(这里装的是mysql 8.0.24)

3: docker下载canal镜像

安装结果如下:

 

安装步骤非常简单:

docker pull mysql:8.0.24

docker pull canal/canal-server

 

4: 启动mysql容器

   启动

docker run -d --name mysql -e MYSQL_ROOT_PASSWORD=123456 -p 3306:3306 mysql:8.0.24
配置访问:
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
FLUSH PRIVILEGES;

创建用户canal:
CREATE USER canal IDENTIFIED BY 'canal';
GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'canal'@'%';
ALTER USER 'canal'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
-- 
GRANT ALL PRIVILEGES ON *.* TO 'canal'@'%' ;
FLUSH PRIVILEGES;

5: 启动canal容器

启动容器

docker run -p 11111:11111 --name canal -d canal/canal-server

修改配置

进入容器:

docker exec -it canal /bin/bash

cd /home/admin/canal-server/conf/example

vi instance.properties 

# position info (这个ip需要修改为云服务器的ip加端口)
canal.instance.master.address=47.115.24.184:3306

# username/password(这个地方需要修改为mysql新建的用户密码)
canal.instance.dbUsername=canal
canal.instance.dbPassword=123456
canal.instance.connectionCharset = UTF-8

# table regex (监听的表名: 这里使用了默认监听全部)

canal.instance.filter.regex=.*\\..*
 

cd /home/admin/canal-server/conf

vi canal.properties  

# tcp bind ip (仅仅新增了一个canal.id=123)
canal.id=123
canal.ip =
# register ip to zookeeper
 

6: 这里是用了阿里云服务器, 需要在安全配置那开放端口.

 

7: 示例工程: 

application.yml:

canal:
  server: 云服务器ip:11111
  destination: example
spring:
  application:
    name: canal-example
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://云服务器ip:3306/shop_goods?useSSL=false
    username: canal
    password: 123456
  jooq:
    sql-dialect: mysql
  flyway:
    baseline-on-migrate: true

主要依赖:

    
        top.javatool
        canal-spring-boot-starter
        1.2.1-RELEASE
    
    
        org.springframework.boot
        spring-boot-starter-web
    
    
        org.springframework.boot
        spring-boot-starter-jooq
    
    
        mysql
        mysql-connector-java
        8.0.21
    
    
        org.flywaydb
        flyway-core
    
    
        org.springframework.kafka
        spring-kafka
    

@Component
@CanalTable(value = "t_user")
public class UserHandler implements EntryHandler {
    private Logger logger = LoggerFactory.getLogger(UserHandler.class);
    @Override
    public void insert(User user) {
        logger.info("insert message  {}", user);
    }
    @Override
    public void update(User before, User after) {
        logger.info("update before {} ", before);
        logger.info("update after {}", after);
    }
    @Override
    public void delete(User user) {
        logger.info("delete  {}", user);
    }
}

@SpringBootApplication
public class CanalExampleApplication {
    public static void main(String[] args) {
        SpringApplication.run(CanalExampleApplication.class, args);
    }
}

@Table(name = "t_user")
public class User implements Serializable {

    /**
     * 主键
     */
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;


    /**
     * 用户名
     */
    @Column(name = "user_name")
    private String userName;


    /**
     * 用户性别
     */

    private Integer gender;

    /**
     * 国家id
     */
    @Column(name = "country_id")
    private Integer countryId;


    /**
     * 用户出生日期
     */
    private Date birthday;


    /**
     * 用户创建时间
     */
    @Column(name = "create_time")
    private Date createTime;


    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }


    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    public Integer getCountryId() {
        return countryId;
    }

    public void setCountryId(Integer countryId) {
        this.countryId = countryId;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }


    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("User{");
        sb.append("id=").append(id);
        sb.append(", userName='").append(userName).append('\'');
        sb.append(", gender=").append(gender);
        sb.append(", countryId=").append(countryId);
        sb.append(", birthday=").append(birthday);
        sb.append(", createTime=").append(createTime);
        sb.append('}');
        return sb.toString();
    }
}

然后启动工程,

修改数据库的表: 

@CanalTable(value = "t_user") 这个是监听的表结构

t_user

然后会触发相应的方法!