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+# proxysql_mysqlbinlog
+
+`proxysql_mysqlbinlog` is a service that runs on MySQL host, tracks GTID and reports it to ProxySQL.
+It was built to complement ProxySQL's [Adaptive query routing based on GTID tracking](https://www.proxysql.com/blog/proxysql-gtid-causal-reads) feature.
+
+## Install
+
+The project is built using Makefile. There's also a Docker image available with pre-built sources (`renecannao/proxysql_mysqlbinlog:ubuntu18`).
+
+## Usage
+
+```
+$ proxysql_binlog_reader -h <mysql-host> -u <mysql-user> -l <port-to-listen> -f
+# or
+$ docker run renecannao/proxysql_mysqlbinlog:ubuntu18 -p 3310:3310 /proxysql_binlog_reader -h <mysql-host> -u <mysql-user> -l <port-to-listen> -f
+```
+
+Arguments:
+
+* `-h`: MySQL host
+* `-u`: MySQL username
+* `-p`: MySQL password
+* `-P`: MySQL port
+* `-l`: Port to listen and to serve GTID stats
+* `-f`: (optional, recommended for container setup) run in foreground as opposite to daemonizing
+* `-L`: (optional) path to log file
+
+## Setting up with ProxySQL
+
+0. Make sure you're running ProxySQL >= 2.0
+1. Setup `proxysql_mysqlbinlog` to run on MySQL host, confirm that it's listening on the specified port and serves stats (easy to check with `nc <host> <port>`)
+2. In ProxySQL configuration, add `gtid_port` to the host configuration, pointing to the port that `proxysql_mysqlbinlog` listens on. Note that ProxySQL expects `proxysql_mysqlbinlog` to run on the same hostname as MySQL, but on the different port.
+3. Enter ProxySQL admin and inspect `stats_mysql_gtid_executed` table. You'll be supposed to see GTIDs being updated in ProxySQL's memory.
+
+```
+Admin> select hostname,gtid_executed from stats_mysql_gtid_executed order by hostname\G
+*************************** 1. row ***************************
+     hostname: mysql1
+gtid_executed: 85c17137-4258-11e8-8090-0242ac130002:1-146301
+*************************** 2. row ***************************
+     hostname: mysql2
+gtid_executed: 85c17137-4258-11e8-8090-0242ac130002:1-146300,8a093f5f-4258-11e8-8037-0242ac130004:1-5
+*************************** 3. row ***************************
+     hostname: mysql3
+gtid_executed: 85c17137-4258-11e8-8090-0242ac130002:1-146301,8a0ac961-4258-11e8-8003-0242ac130003:1-5
+```