#terraform, Coding, vscode

Terraform, Docker, Ubuntu 20.04, Go 1.14 and MemLock: Down the rabbit hole

I recently upgrade my machine and and installed the latest Ubuntu 20.04 as part of that.

Very smugly I fired it up the new install and, as I use devcontainers, looked forward to not installing lots of devtools as the Dockerfile in each project had all the tooling needed for VSCode to spin up and get going.

Sadly it wasn’t that smooth. After spinning up a project which uses terraform I found an odd message when running terraform plan

failed to retrieve schema from provider “random”: rpc error: code = Unavailable desc = connection error: desc = “transport: authentication handshake failed: EOF

error from terraform plan

Terraform has a provider model which uses GRPC to talk between the CLI and the individual providers. Random is one of the HashiCorp made providers so it’s a really odd one to see a bug in.

Initially I assumed that the downloaded provider was corrupted. Nope, clearing the download and retrying didn’t help.

So assuming I’d messed something up I:

  1. Tried changing the docker image using by the devcontainer. Nope. Same problem.
  2. Different versions of terraform. Nope. Same problem.
  3. Updated the Docker version I was using. Nope. Same problem.
  4. Restarted the machine. Nope. Same problem.

Now feeling quite frustrated I finally remembered a trick I’d used lots when building my own terraform providers. I enabled debug logging on the terraform CLI.

TF_LOG=DEBUG terraform plan

This is where it gets interesting…

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