Error in Running a Bash Script in terraform user_data

Question

I am using Terraform to deploy EC2 instance and install boostacks wiki on it. Bookstack offers a bash script that automatically installs the files on the ubuntu server however, when i run the script in the user_data nothing happens. I am not sure why? Here is the user_Data code

user_data= <<-EOF
      # Ensure you have read the above information about what this script does before executing these commands.
      sudo apt install wget
      
      # Download the script
      wget https://raw.githubusercontent.com/BookStackApp/devops/main/scripts/installation-ubuntu-18.04.sh

      # Make it executable
      chmod a+x installation-ubuntu-18.04.sh

      # Run the script with admin permissions
      sudo ./installation-ubuntu-18.04.sh 
            
            

      EOF
tags ={
  Name ="bookstacks_terraform"
}

When the script has run successfully, the user should be prompted to enter the domain. However, nothing happens and I dont know how to test it.

user_data is just a raw data object passed to the software running in the EC2 instance. It's up to software in the EC2 instance to decide how to process it. — Martin Atkins
– Martin Atkins, Commented Jan 26, 2022 at 18:12
Since you mentioned Ubuntu Server I'm betting that the software interpreting your script here is cloud-init, and so I added a tag for that so that your question might be visible to folks who have cloud-init knowledge. — Martin Atkins
– Martin Atkins, Commented Jan 26, 2022 at 18:13
However, the main point I'd make here is that cloud-init -- and therefore any other software it might run as part of executing your provided script -- is running in a context where it has no direct input or output. It launches like a server installed on your system would, where its only means of output is to write to a log file, and it has no means to prompt for input. — Martin Atkins
– Martin Atkins, Commented Jan 26, 2022 at 18:14
You will probably need to find a different strategy to get the needed result without any prompt. — Martin Atkins
– Martin Atkins, Commented Jan 26, 2022 at 18:14
Hopefully someone more familiar with cloud-init can suggest typical techniques for debugging it; I assume it's writing some useful information to a log file, but I don't know what logging settings Ubuntu Server AMIs include and thus where to find the resulting logs. — Martin Atkins
– Martin Atkins, Commented Jan 26, 2022 at 18:15

Marcin · Accepted Answer · 2022-01-26 22:48:34Z

2

Your apt will hang for your confirmation. You forgot about -y:

sudo apt install -y wget

answered Jan 26, 2022 at 22:48

Marcin

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