How I fixed my 1-Click Packer build

[Cristy94]

I am working on my 1-Click App, and I spent 1 week trying to make, using Packer, an image that actually works.

I am deploying from Windows, and I had to fix multiple issues from the current template/guide.

Those were the fixes I had to debug and implement:

• Add rm -rf /opt/digitalocean to 90-cleanup.sh
• Use ubuntu-20-04 because with ubuntu-22-04 packer fails SSH connection
• Fix CRLF/LF newline issues. I wrote my scripts and ran packer on Windows, when uploading the newline characters where wrong. I had to make sure all scripts/files have the right LF line endings.
• Fix file permissions. The 001_onboot and 99-one-click MOTD scripts were not executed, because files copied by packer don't have execute permissions. I have added this to marketplace-image.json, after the files are copied:

    {
      "type": "shell",
      "inline": [
        "chmod +x /var/lib/cloud/scripts/per-instance/001_onboot",
        "chmod +x /etc/update-motd.d/99-one-click"
      ]
    },

[Cristy94]

Oh, and the MOTD IP retrieval was wrong. The hostname command used in the template just returns 127.0.0.1

I wrote this instead in 99-one-click: myip=$(ip addr show eth0 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1 | head -n 1)