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I'd like to install an application using a standard bash- or shell-script, in order to deploy the application on several servers without a user interaction.

To give an example, let's say I'd like to install Pi Hole, which is pretty easy to install but it will open a graphical setup in order to install all components. When installing this application via a script the installation will fail or it'll be not working due to a lack of information.

Is there a way to skip graphical setups like this in Debian and provide a configuration file to provide the needed information while the setup process?

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  • If it's using the standard Debian installer, then wiki.debian.org/DebianInstaller/Preseed will work... Or debconf-set-selections if it's after the install phase. Not an answer because that's essentially throwing the manual at you.
    – derobert
    Commented Feb 23, 2018 at 18:56
  • For non-interactive install you can set environment variable export DEBIAN_FRONTEND=noninteractive before running apt-get install. It will choose default values than.
    – mviereck
    Commented Feb 23, 2018 at 19:57
  • Edit the functions under github.com/pi-hole/pi-hole/blob/master/automated%20install/…
    – GAD3R
    Commented Feb 23, 2018 at 20:57

2 Answers 2

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If you just want to disable the debconf questions, all you need to do is set the DEBIAN_FRONTEND environment variable to noninteractive:

DEBIAN_FRONTEND=noninteractive apt-get install foo bar baz
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This guide has the information you are looking for. It is going to vary on a software to software basis. I had previously misread the question as if you needed an unattended pihole install. As mentioned by user derobert, this is not much of a solution. Good Luck!

Create /etc/pihole/setupVars.conf with the variables you want as outlined here.

After you have created the setupVars.conf to your specification, you can run: 

curl -L https://install.pi-hole.net | bash /dev/stdin --unattended

This should install pihole without needing additional input. It is up to you if you want to create a script that will create the setupVars.conf or copy the first one you create for new installs. Do not forget to look through the documentation. Good luck!

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