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CloudFormation Userdata

January 15, 2021

Here’s another way to add startup scripts to your instance during creation.

      UserData:
        Fn::Base64: !Sub |
          #cloud-config
          repo_upgrade: none
 
          runcmd:
            # Cloud init startup script
            - "bash /root/setup.sh"
 
          write_files:
            # Cloud init startup script
            - owner: root:root
              permissions: '0644'
              path: /root/setup.sh
              content: |
                #! /bin/bash -x
          write_files:
            # Cloud init startup script
            - owner: root:root
              permissions: '0644'
              path: /root/setup.sh
              content: |
                #! /bin/bash -x
                # run your bash commands here
                date > log.txt
                uptime >>  log.txt

UserData: Fn::Base64: !Sub | #cloud-config repo_upgrade: none runcmd: # Cloud init startup script - "bash /root/setup.sh" write_files: # Cloud init startup script - owner: root:root permissions: '0644' path: /root/setup.sh content: | #! /bin/bash -x write_files: # Cloud init startup script - owner: root:root permissions: '0644' path: /root/setup.sh content: | #! /bin/bash -x # run your bash commands here date > log.txt uptime >> log.txt

The above script creates a file setup.sh and executes it during instance creation. The output is dumped to log.txt file.

Filed Under: Cloud Tagged With: cloudformation, execute, file, run, startup, userdata

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