MySQL connector

The MySQL connector supports all version of MySQL from 5.1.

It fully supports SSL connections from database clients if a valid certificate and private key are provided in the project.


The MySQL connector accepts the following parameters:

Connection name

Can be any name you wish. Cannot be empty.


If checked, then this connection will be active any time Gallium Data is running, meaning that the local port will be open and listening for requests. If you uncheck this (and then click Publish), then the connection is "commented out" -- it's as if it didn't exist, but you can still keep it around for later.

Server host

The name or address of the database server. This can be a partial name (like dbserver), a full name (like, an IP4 address (like or an IP6 address if your network supports IP6 (e.g. 266a:1790:2920:69e0::15e0).

If you are running Gallium Data as a Docker container, and the database is on the same machine, you can use host.docker.internal (on Windows or Mac, but see here for Linux).

Server port

The port on the database server. For MySQL, it's usually 3306 but it can also be something else.

Local address

The address on which to listen for requests. This is typically only relevant if your server has more than one address. By default, Gallium Data will listen on all addresses (which is equivalent to

Local port

The port number in the Gallium Server that will be listening to requests from database clients.

Use SSL to server

whether to use SSL when connecting to the database server. There are three options:

  • never: disables SSL completely when talking to the server

  • always: always use SSL when talking to the server

  • on request: use SSL if the client uses SSL

Note that, if you want to use SSL (i.e. either always or on request), the database server's certificate must be trusted by Gallium Data, meaning that either the database server uses a certificate that is signed by a well-known certificate authority, or the certificate is installed in the Gallium Data project's trust (under Project > Properties). You can also use the Trust server certificate option (see below).

Use SSL to client

Similarly, three values are possible:

  • never: disable SSL from clients, SSL connection attempts will be rejected

  • always: always require SSL for client connections, non-SSL connections will be rejected

  • on request: accept SSL connections from clients, as well as non-SSL requests

If you use always or on request, you must install a private key, as well as any certificates going with it, in the project's key area (under Project > Properties).

Timeout to server

If specified, the number of milliseconds to wait,when trying to establish a connection to the database server, before giving up and returning an error. If this is set to 0, the connection will never timeout. If this is unspecified, the default is 30000 (30 seconds).

Trust server certificate

If this is checked, any SSL connection to the database server will not check whether the server's SSL certificate is trusted -- it will just accept whatever certificate the server presents.



Once the required parameters are filled, and published to the server, you can press the Test button to verify that Gallium Data can talk to the specified database server. This will attempt to open a connection to the database server, thereby establishing basic network connectivity. In addition, if the Use SSL to server option is either Always or On request, Gallium Data will also attempt to establish an SSL connection to verify that certificates are properly installed. Note that no login is performed, since Gallium Data does not have any database credentials.

Delete this connection

Will delete the connection after confirmation. This is not undoable, unless you recover from a backup.

About host names and addresses

If you are running Gallium Data as a Docker container, keep in mind that IP addresses and host names need to be from the perspective of the Docker container. If, for instance, you are running a MySQL database on your local machine, and you usually connect to it using host name localhost or (or maybe ::1 if you use IP6), the same name or address will not work from the Docker container (since localhost would refer to the Docker virtual machine, not the host machine).

The host name of your machine, as seen from a Docker container running on the same machine, is usually host.docker.internal on Windows and Mac. For Linux and other operating systems, you may need to dig a little deeper.

If you are running both Gallium Data and the database server(s) in Docker, you can make connectivity easy by running them in the same Docker network, but there are many other ways to accomplish the same goal if you're running in a managed environment like Kubernetes or OpenShift.

Packet types

MySQL uses a number of packet types, described in the MySQL packets page.

Filter types

This connector supports a number of request filters, response filters and duplex filters.

All filters can expect the object context.myutils to be defined.