I was pleasantly surprised to find that it works ok to set `min_node_count` to zero. But the docs say it must be at least one, so this PR proposes a tweak to update that.
More context, from https://cloud.google.com/kubernetes-engine/docs/concepts/cluster-autoscaler:
> Beginning with Kubernetes version 1.7, you can specify a minimum size of zero for your node pool. This allows your node pool to scale down completely if the instances within aren't required to run your workloads. However, while a node pool can scale to a zero size, the overall cluster size does not scale down to zero nodes (as at least one node is always required to run system Pods).
## What
As well as https://github.com/terraform-providers/terraform-provider-google/pull/1282 , make `resource_container_node_pool` importer accept `{project}/{zone}/{cluster}/{name}` format to specify the project where the node pool belongs to actually.
## Why
Sometimes I want to import container pool in different project from default SA's. However, currently there is no way to specify project the target node pool belongs to, Terraform tries to retrieve node pool from SA's project, then it fails due to `You cannot import non-existent resources using Terraform import.` error.
This PR also switched us to using the beta API in all cases, and that had a side effect which is worth noting, note included here for posterity.
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The problem is, we add a GPU, and as per the docs, GKE adds a taint to
the node pool saying "don't schedule here unless you tolerate GPUs",
which is pretty sensible.
Terraform doesn't know about that, because it didn't ask for the taint
to be added. So after apply, on refresh, it sees the state of the world
(1 taint) and the state of the config (0 taints) and wants to set the
world equal to the config. This introduces a diff, which makes the test
fail - tests fail if there's a diff after they run.
Taints are a beta feature, though. :) And since the config doesn't
contain any taints, terraform didn't see any beta features in that node
pool ... so it used to send the request to the v1 API. And since the v1
API didn't return anything about taints (since they're a beta feature),
terraform happily checked the state of the world (0 taints I know about)
vs the config (0 taints), and all was well.
This PR makes every node pool refresh request hit the beta API. So now
terraform finds out about the taints (which were always there) and the
test fails (which it always should have done).
The solution is probably to write a little bit of code which suppresses
the report of the diff of any taint with value 'nvidia.com/gpu', but
only if GPUs are enabled. I think that's something that can be done.
* add support for `google_container_node_pool` management (sans-tests)
* [review] add tests, docs, general cleanup
* add docs
* [review] amend test to check updates and terraform fmt
* test updates, make nested management fields non-computed
* Add preemptible as an option to node config
* Check for preemptible in test matching functions
* Move flattenClusterNodeConfig to node_config
* Handle bools properly when comparing in cluster and node pool tests
* Use a supported image_type in cluster tests
* Add support node config for GKE node pool
* Review fixes:
- Set max items in node config schema
- Fill missing node config fields
- Put test helpers above than test vars
* Update checks in node pool tests
* Fix node pool check match
