Problem

Storage limits on some elastic agent instances might require that the build directory of the elastic agent be relocated. 

Workaround

You can solve this problem by adding a startup script to your image in Bamboo that will mount an external storage location to a local folder and update the agent configuration. 

1. In Bamboo server, go to Admin >> Elastic Instances >> Image Configurations
2. Select the Stock image you want to customize and click Edit

3. Go to Instance startup script field and add the following script:

4. 1. Linux Stock image 

      mkdir /b
      chown bamboo:bamboo -R /b
      
      mkdir -p /mnt/bamboo-ebs/bamboo-agent/
      cp /opt/bamboo-elastic-agent/ebs-resources/bamboo-agent.cfg.xml /mnt/bamboo-ebs/bamboo-agent/
      chown bamboo:bamboo -R /mnt/bamboo-ebs
      
      sed -i 's:<buildWorkingDirectory>.*</buildWorkingDirectory>:<buildWorkingDirectory>/b</buildWorkingDirectory>:g' /mnt/bamboo-ebs/bamboo-agent/bamboo-agent.cfg.xml
      su - bamboo -c "/opt/bamboo-elastic-agent/ebs-resources/customiseInstance.sh"

   2. Windows Stock image 

      mkdir C:\b
      icacls "C:\b" /grant Bamboo:(OI)(CI)F /T
      
      sed -i "s/<buildWorkingDirectory>.*</<buildWorkingDirectory>c:\\\b</" C:\Users\Bamboo\bamboo-agent-home\bamboo-agent.cfg.template.xml

5. Start your elastic instance