Unable to install the Google Cloud Logging Agent when using Packer

[Alexander Christie]

Hi all!

I've hit an issue which I can't explain regarding inconsistent behaviour of the "https://dl.google.com/cloudagents/install-logging-agent.sh" when run via terminal and via packer.

Running via terminal produces the expected result of installing the agent whilst running via packer causes the following failure:

==> googlecompute: Failed to download metadata for repo 'google-cloud-logging'

==> googlecompute: Error: Failed to download metadata for repo 'google-cloud-logging'

Now I understand that this looks a lot like the "I'm using /sh instead of /bash" from the https://packer.io/docs/provisioners/shell.html#troubleshooting section of the documentation. However this is not the case as I explicitly run the script with bash and have verified that it is being run with bash through packer in a couple of different ways.

I've included a replication case below that can easily be spun up by anyone with a Google Cloud Project. Hopefully someone here can see what is going wrong?

Thanks!

{
 "variables": {},
 "builders": [{
 "type": "googlecompute",
 "ssh_username": "provisioning",
 "source_image_family": "centos-8",
 "zone": "europe-west1-b",
 "disable_default_service_account": true,
 "image_name": "centos-8-base-{{isotime \"2006-01-02\"}}"
 }],
 "provisioners": [
 {
 "type": "shell",
 "inline": [
 "sudo yum upgrade -y"
 ]
 },
 {
 "type": "shell",
 "inline": [
 "curl -sL https://dl.google.com/cloudagents/install-logging-agent.sh | sudo bash -"
 ]
 }
 ]
}

[Rickard von Essen]

Instead of curling down the script, download it and use the file privisioner to get it into the image and run that. Also add set -x on the top of it and you will probably find the issue. 

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[Alexander Christie]

Hi Rickard,

I actually tried that earlier today and was unable to find any additional logs to help me understand what was going on.

I also tried changing the execute command in a few different configurations but was ultimately unable to get any additional details.

Thanks,

Alex

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[Rickard von Essen]

Try installing python2 before running the script. 

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[Alexander Christie]

For future readers who might find this post the issue is that the Google Cloud Logging and Monitoring Agent scripts require a PTY terminal for reasons I have been unable to asertain.

To fix this issue simply add

"ssh_pty": true

It seems that the interactive nature of the SSH connection unblocks some kind of HTTPS error inside of Yum.

If anyone from Packer or Google would like to explore this further it would be highly interesting to know the details!

Thanks,

Alex