mysql 配置文件：（注释的是 canal 需要的）
[mysqld]
# 打开binlog
log-bin=mysql-bin
# 选择ROW(行)模式
binlog-format=ROW
# 配置MySQL replaction需要定义，不要和canal的slaveId重复
server_id=1
collation_server=utf8_bin
character_set_server=utf8
sql_mode = 'STRICT_TRANS_TABLES'
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8
启动 mysql docker 容器
docker run -itd --name mysql56_canal -p 8005:3306 -v /usr/test/conf:/etc/mysql/mysql.conf.d/mysqld.cnf -e MYSQL_ROOT_PASSWORD=4396 mysql:5.6.50
mysql 设置权限
MySQL [(none)]> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)
MySQL [(none)]> show variables like 'log_bin'; # bin_log 开启
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin | ON |
+---------------+-------+
1 row in set (0.00 sec)
MySQL [(none)]> show binary logs; # bin_log 文件列表
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000001 | 65417 |
| mysql-bin.000002 | 1410106 |
| mysql-bin.000003 | 4117641 |
| mysql-bin.000004 | 120 |
+------------------+-----------+
4 rows in set (0.00 sec)
MySQL [(none)]> show master status # 正在写入的 bin_log文件
-> ;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000004 | 120 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
# 创建用户
MySQL [(none)]> create user 'canal'@'%' identified by 'Canal@123456';
Query OK, 0 rows affected (0.00 sec)
# 分配权限
MySQL [(none)]> grant SELECT, REPLICATION SLAVE, REPLICATION CLIENT on *.* to 'canal'@'%' identified by 'Canal@123456';
Query OK, 0 rows affected (0.00 sec)
MySQL [(none)]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
服务端：canal docker 部署
docker pull canal/canal-server:v1.1.4
cannal docker-compose 文件
version: '3'
services:
canal-server:
image: canal/canal-server:v1.1.4
container_name: canal-server
restart: unless-stopped
ports:
- 8004:11111
environment:
- canal.auto.scan=false
- canal.instance.master.address=120.55.163.233:8005
- canal.instance.dbUsername=canal
- canal.instance.dbPassword=canal
- canal.instance.filter.regex=.*\\..*
- canal.destinations=test
- canal.instance.connectionCharset=UTF-8
- canal.instance.tsdb.enable=true
volumes:
- /usr/test/canal_test/log/:/home/admin/canal-server/logs/
python 客户端 canal
pip install canal-python # 安装模块
pip install --upgrade google-api-python-client google-auth-httplib2 google-auth-oauthlib # 依赖包
官方 demo
import time
from canal.client import Client
from canal.protocol import EntryProtocol_pb2
from canal.protocol import CanalProtocol_pb2
client = Client()
client.connect(host='127.0.0.1', port=11111)
client.check_valid(username=b'', password=b'')
client.subscribe(client_id=b'1001', destination=b'test', filter=b'.*\\..*')
while True:
message = client.get(100)
entries = message['entries']
for entry in entries:
entry_type = entry.entryType
if entry_type in [EntryProtocol_pb2.EntryType.TRANSACTIONBEGIN, EntryProtocol_pb2.EntryType.TRANSACTIONEND]:
continue
row_change = EntryProtocol_pb2.RowChange()
row_change.MergeFromString(entry.storeValue)
event_type = row_change.eventType
header = entry.header
database = header.schemaName
table = header.tableName
event_type = header.eventType
for row in row_change.rowDatas:
format_data = dict()
if event_type == EntryProtocol_pb2.EventType.DELETE:
for column in row.beforeColumns:
format_data = {
column.name: column.value
}
elif event_type == EntryProtocol_pb2.EventType.INSERT:
for column in row.afterColumns:
format_data = {
column.name: column.value
}
else:
format_data['before'] = format_data['after'] = dict()
for column in row.beforeColumns:
format_data['before'][column.name] = column.value
for column in row.afterColumns:
format_data['after'][column.name] = column.value
data = dict(
db=database,
table=table,
event_type=event_type,
data=format_data,
)
print(data)
time.sleep(1)
client.disconnect()
运行客户端，测试
create database ttt; # 创建数据库
use ttt # 切换到数据库
CREATE TABLE `role` ( `id` int unsigned NOT NULL AUTO_INCREMENT, `role_name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COLLATE=utf8_bin; # 创建 role 表
insert into role (id, role_name) values (10, 'admin'); # 插入数据
update role set role_name='hh' where id = 10; # 更新数据
delete from role where id = 10; # 删除数据
得到结果
变更一条数据，输出内容分三部分，分别是：TRANSACTIONBEGIN，ROWDATA 和 TRANSACTIONEND。然后我们比较关注的内容都在 ROWDATA 中，解析出来之后就是我们需要的，包括数据库名，表名和变更内容。
其中 event_type 字段 1 表示新增，2 表示更新，3 表示删除。
canal 服务端启动之后，在 /home/admin/canal-server/logs/test 目录下会生成两个日志文件，分别是：meta.log 和 test.log，可以查看服务是不是正常，有没有报错信息。其中 test 是启动 Docker 时 canal.destinations 设置的名称。
别人踩坑记录
问题：
解决：fetch failed by table meta:schemeName.tableName
Caused by: java.io.IOException: ErrorPacket [errorNumber=1142, fieldCount=-1, message=SHOW command denied to user
binlog 权限问题 select 权限要加上
由于我使用的是内网pypi不是最新，无法获取canal-python，将主页上源码下载后放在python环境目录下的site-package目录下即可；
无论原始数据是int还是varchar，解析出来的数据都是字符串类型；