Dockerized MariaDB MaxScale with default config for a three node galera cluster. Various settings can be configured with environemnt variables.
You need to specify the addresses for DB1 through DB3 as well as passwords for service and monitoring users:
docker run -e DB1_ADDRESS=127.0.0.1 -e DB2_ADDRESS=127.0.0.2 -e DB3_ADDRESS=127.0.0.3 -e SERVICE_PWD="SuperSecret1234" -e MONITOR_PWD="EvenMoreSecret" quay.io/maxscale:6.1.3
Config is done through env vars:
| Name | Default value | Description |
|---|---|---|
SERVICE_USER |
maxscale |
Service user |
SERVICE_PWD |
Password for the service user | |
READ_WRITE_LISTEN_ADDRESS |
127.0.0.1 |
Listen address for read/write service |
READ_WRITE_PORT |
3307 |
Listen port for read/write service |
READ_WRITE_PROTOCOL |
MariaDBClient |
Protocol for read/write service |
MASTER_ONLY_LISTEN_ADDRESS |
127.0.0.1 |
Listen address for master only service |
MASTER_ONLY_PORT |
3306 |
Listen port for master only service |
MASTER_ONLY_PROTOCOL |
MariaDBClient |
Protocol for master onyl service |
MONITOR_USER |
maxscale |
Monitoring user |
MONITOR_PWD |
Password for the monitoring user | |
DB1_ADDRESS |
db1.example.org |
Address for backend DB1 |
DB1_PORT |
3306 |
Port for backend DB1 |
DB1_PRIO |
1 |
Priority for backend DB1 |
DB2_ADDRESS |
db2.example.org |
Address for backend DB2 |
DB2_PORT |
3306 |
Port for backend DB2 |
DB2_PRIO |
2 |
Priority for backend DB2 |
DB3_ADDRESS |
db3.example.org |
Address for backend DB3 |
DB3_PORT |
3306 |
Port for backend DB3 |
DB3_PRIO |
3 |
Priority for bakcend DB3 |
To use a complete custom config, mount your own config file to /etc/maxscale.cnf:
docker run -v /home/customfile.cnf:/etc/maxscale.cnf maxscale:6.1.3
A plain build will use the defaults from the table above:
docker build .
To run this image as a sidecar container in OpenShift, see the sidecar_template.yaml in the folder openshift. The standalone_template.yaml can be used to run a standalone instance of MaxScale. The templates need the parameters MAXSCALE_SERVICE_PW, MAXSCALE_MONITOR_PW, DB1_ADDRESS, DB2_ADDRESS, DB3_ADDRESS and DATABASE_NAME to connect to the galera cluster.