Guides - Use an Externally Hosted Deployment Script

External Deployment Script

If you have an existing deployment script, you can use a StackScript to deploy Linode instances with it. The following example StackScript installs PHP on the Linode, downloads an external PHP script from the URL http://example.com/deployment-script.php, makes it executable, and then runs the downloaded script.

Bash Example

File: Bash StackScript Example

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#!/bin/bash if [ -f /etc/apt/sources.list ]; then apt update apt -y install php elif [-f /etc/yum.conf ]; then yum -y install php elif [-f /etc/pacman.conf ]; then pacman -Sy pacman -S --noconfirm pacman pacman -S --noconfirm php else echo "Your distribution is not supported by this StackScript" exit fi wget http://example.com/deployment-script.php --output-document=/opt/deployment-script.php chmod +x /opt/deployment-script.php ./opt/deployment-script.php

Python Example

The same script can be applied via python using the following syntax:

File: Python StackScript Example

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#!/usr/bin/python3 import os.path if os.path.isfile('/etc/apt/sources.list'): os.system('sudo apt update && sudo apt -y upgrade') os.system('sudo apt -y install php php-common') elif os.path.isfile('/etc/yum.conf'): os.system('sudo yum install -y wget && sudo yum -y install php') elif os.path.isfile('/etc/pacman.conf'): os.system('pacman -Sy && pacman -S --noconfirm pacman && pacman -S --noconfirm php') else: print("Your Distribution is not supported by this StackScript") os.system('wget http://example.com/deployment-script.php --output-document=/opt/deployment-script.php') os.system('chmod +x /opt/deployment-script.php') print("StackScript Complete. Thank you!")

Embedded Deployment Script

If you do not want to rely on an existing external server to host your scripts for download, you can embed the bootstrapped script into the StackScript.

File: Embedded Script Example

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#!/bin/bash if [ -f /etc/apt/sources.list ]; then apt update apt -y install php elif [-f /etc/yum.conf ]; then yum -y install php elif [-f /etc/pacman.conf ]; then pacman -Sy pacman -S --noconfirm pacman pacman -S --noconfirm php else echo "Your distribution is not supported by this StackScript" exit fi cat >/opt/deployment-script.php <<EOF #!/usr/bin/php <?php print('Hello World!'); ?> EOF chmod +x /opt/deployment-script.php ./opt/deployment-script.php

Install Software Dependencies

When using scripts other than bash, the underlying software supporting the scripting language may need to be installed to the operating system as part of the StackScript. This issue can be resolved by creating a simple StackScript in bash to install the required software, and then importing and executing the second StackScript which is using the desired language. For CentOS for example, this StackScript could be used to install python3, and apply a script that was previously created for it:

File: Example StackScript to Install Dependencies

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#!/bin/bash sudo dnf install -y python3 source <ssinclude StackScriptID=1111> python3 /root/ssinclude-1111