This documentation is for Dash Enterprise.
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In some cases you may need to install and configure system
dependencies. Examples include installing and configuring
database drivers or the Java JRE environment.
Dash Enterprise supports these actions through an
Aptfile and a predeploy script.
If you need help configuring complex system-level dependencies, please
reach out to our support team.
In the root of your app folder, create a file called
Aptfile. Here you may specify APT packages to be
installed with one package per line. For example, to install
the ODBC driver, your
Aptfile would look like:
If Dash Enterprise is internet-restricted, you need to specify a custom APT repository that Dash Enterprise has network access to in your
Aptfile. See an example in
Developing Apps when Dash Enterprise Is Internet-Restricted.
You may include a predeploy script that executes in
your Dash app’s environment. For the case of adding an
ODBC driver, you need to add ODBC initialization files into
the correct systems paths. To do so, include the ODBC
initialization files in the app folder and then
copy them into system paths in the predeploy script.
Let’s generate a file to do this. This file can
have any name but must correspond to what is called in the
project.toml file that you’ll add in the next step.
For the purposes of this example, we assume you have
setup_pyodbc and installed it in the root of your
cp /app/odbc.ini /etc/odbc.ini cp /app/odbcinst.ini /etc/odbcinst.ini
Next, you need to instruct Dash Enterprise to run your
file by adding a
project.toml file to the root of your app folder.
[scripts] predeploy = "setup_pyodbc"
Now when the app is deployed, it will install the APT
packages specified in the
Aptfile and run the setup file
project.toml. In this example, the ODBC driver is installed and configured.