MySQL Filter¶

In this example, we show how the MySQL filter can be used with the Envoy proxy. The Envoy proxy configuration includes a MySQL filter that parses queries and collects MySQL-specific metrics.

Running the Sandboxes¶

The following documentation runs through the setup of Envoy described above.

Step 1: Install Docker¶

Ensure that you have a recent versions of docker and docker-compose installed.

A simple way to achieve this is via the Docker Desktop.

Step 2: Clone the Envoy repo¶

If you have not cloned the Envoy repo, clone it with:

git clone git@github.com:envoyproxy/envoy

git clone https://github.com/envoyproxy/envoy.git

Step 3: Build the sandbox¶

Terminal 1

$ pwd
envoy/examples/mysql
$ docker-compose pull
$ docker-compose up --build -d
$ docker-compose ps

    Name                   Command               State                             Ports
------------------------------------------------------------------------------------------------------------------
mysql_mysql_1   docker-entrypoint.sh mysqld      Up      0.0.0.0:3306->3306/tcp
mysql_proxy_1   /docker-entrypoint.sh /bin       Up      10000/tcp, 0.0.0.0:1999->1999/tcp, 0.0.0.0:8001->8001/tcp

Step 4: Issue commands using mysql¶

Use mysql to issue some commands and verify they are routed via Envoy. Note that the current implementation of the protocol filter was tested with MySQL v5.5. It may, however, not work with other versions of MySQL due to differences in the protocol implementation.

Terminal 1

$ docker run --rm -it --network envoymesh mysql:5.5 mysql -h envoy -P 1999 -u root
... snip ...

mysql> CREATE DATABASE test;
Query OK, 1 row affected (0.00 sec)

mysql> USE test;
Database changed
mysql> CREATE TABLE test ( text VARCHAR(255) );
Query OK, 0 rows affected (0.01 sec)

mysql> SELECT COUNT(*) FROM test;
+----------+
| COUNT(*) |
+----------+
|        0 |
+----------+
1 row in set (0.01 sec)

mysql> INSERT INTO test VALUES ('hello, world!');
Query OK, 1 row affected (0.00 sec)

mysql> SELECT COUNT(*) FROM test;
+----------+
| COUNT(*) |
+----------+
|        1 |
+----------+
1 row in set (0.00 sec)

mysql> exit
Bye

Step 5: Check egress stats¶

Check egress stats were updated.

Terminal 1

$ curl -s http://localhost:8001/stats?filter=egress_mysql
mysql.egress_mysql.auth_switch_request: 0
mysql.egress_mysql.decoder_errors: 0
mysql.egress_mysql.login_attempts: 1
mysql.egress_mysql.login_failures: 0
mysql.egress_mysql.protocol_errors: 0
mysql.egress_mysql.queries_parse_error: 0
mysql.egress_mysql.queries_parsed: 7
mysql.egress_mysql.sessions: 1
mysql.egress_mysql.upgraded_to_ssl: 0

Step 6: Check TCP stats¶

Check TCP stats were updated.

Terminal 1

$ curl -s http://localhost:8001/stats?filter=mysql_tcp
tcp.mysql_tcp.downstream_cx_no_route: 0
tcp.mysql_tcp.downstream_cx_rx_bytes_buffered: 0
tcp.mysql_tcp.downstream_cx_rx_bytes_total: 347
tcp.mysql_tcp.downstream_cx_total: 1
tcp.mysql_tcp.downstream_cx_tx_bytes_buffered: 0
tcp.mysql_tcp.downstream_cx_tx_bytes_total: 702
tcp.mysql_tcp.downstream_flow_control_paused_reading_total: 0
tcp.mysql_tcp.downstream_flow_control_resumed_reading_total: 0
tcp.mysql_tcp.idle_timeout: 0
tcp.mysql_tcp.upstream_flush_active: 0
tcp.mysql_tcp.upstream_flush_total: 0