kenduemura/mysql-binlog-replication

Streaming mysql binlog replication to external sources

Streaming mysql binlog replication to Snowflake/Redshift/BigQuery

docker-compose up --build

Note: If you get Can't connect to MySQL server on 'mysql' ([Errno 111] Connection refused) error on the first run, try running it again.

We can actually merge all these images into a single image, but I personally prefer it for simplicity at the expense of code duplication.

In another terminal login into the mysql instance

docker-compose exec mysql mysql -u root -pexample

And execute the following

DROP DATABASE IF EXISTS testdb;
CREATE DATABASE testdb; USE testdb;
CREATE TABLE testtbl (id int, name varchar(255));
INSERT INTO testtbl VALUES (1, 'hello'), (2, 'hola'), (3, 'zdravstvuy'), (1, 'bonjour');
DELETE FROM testtbl WHERE id = 1;
SELECT * FROM testtbl;

Or you can just

docker-compose exec mysql mysql -u root -pexample -e "DROP DATABASE IF EXISTS testdb; CREATE DATABASE testdb; USE testdb; CREATE TABLE testtbl (id int, name varchar(255)); INSERT INTO testtbl VALUES (1, 'hello'), (2, 'hola'), (3, 'zdravstvuy'), (1, 'bonjour'); DELETE FROM testtbl WHERE id = 1; SELECT * FROM testtbl;"

Which will output the following to the terminal

+------+------------+
| id   | name       |
+------+------------+
|    2 | hola       |
|    3 | zdravstvuy |
+------+------------+

docker-compose daemon should output something like this

python_1  | {"type": "WriteRowsEvent", "row": {"values": {"name": "hello", "id": 1}}, "table": "testtbl", "schema": "testdb"}
python_1  | INSERT INTO `testdb`.`testtbl`(`name`, `id`) VALUES ('hello', 1);
python_1  | {"type": "WriteRowsEvent", "row": {"values": {"name": "hola", "id": 2}}, "table": "testtbl", "schema": "testdb"}
python_1  | INSERT INTO `testdb`.`testtbl`(`name`, `id`) VALUES ('hola', 2);
python_1  | {"type": "WriteRowsEvent", "row": {"values": {"name": "zdravstvuy", "id": 3}}, "table": "testtbl", "schema": "testdb"}
python_1  | INSERT INTO `testdb`.`testtbl`(`name`, `id`) VALUES ('zdravstvuy', 3);
python_1  | {"type": "WriteRowsEvent", "row": {"values": {"name": "bonjour", "id": 1}}, "table": "testtbl", "schema": "testdb"}
python_1  | INSERT INTO `testdb`.`testtbl`(`name`, `id`) VALUES ('bonjour', 1);
python_1  | {"type": "DeleteRowsEvent", "row": {"values": {"name": "hello", "id": 1}}, "table": "testtbl", "schema": "testdb"}
python_1  | DELETE FROM `testdb`.`testtbl` WHERE `name`='hello' AND `id`=1 LIMIT 1;
python_1  | {"type": "DeleteRowsEvent", "row": {"values": {"name": "bonjour", "id": 1}}, "table": "testtbl", "schema": "testdb"}
python_1  | DELETE FROM `testdb`.`testtbl` WHERE `name`='bonjour' AND `id`=1 LIMIT 1;

Change Data Capture from RDS instance

Update RDS parameter group to make sure log_bin is enabled and set binlog_format to ROW. Update the environment variables with RDS credentials, MYSQL_HOST should be something like testdb.xxx.us-west-2.rds.amazonaws.com.

mysql> show global variables like 'log_bin'; show global variables like 'binlog_format';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin       | ON    |
+---------------+-------+
1 row in set (0.64 sec)

+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| binlog_format | ROW   |
+---------------+-------+
1 row in set (0.61 sec)

References

• https://www.alooma.com/blog/mysql-to-amazon-redshift-replication
• https://aws.amazon.com/blogs/database/streaming-changes-in-a-database-with-amazon-kinesis/
• https://github.com/danfengcao/binlog2sql
• https://www.thegeekstuff.com/2017/08/mysqlbinlog-examples/