New kustomization for pd driver #520

jingxu97 · 2020-06-04T18:44:03Z

This can work for both linux and windows.
The current structure for kustomization is as follows

base: it contains the setup that is common to different driver versions.
- controller_setup: includes cluster setup and controller yaml files
- node_setup:
  - Linux: includes node yaml file and related setting that is only applicable for Linux
  - Windows: includes node yaml file and related setting that is only applicable for Windows
images: it has a list of images for different versions
- stable: currently has only image list for Linux stable version
- alpha: besides image list in stable, also add windows image updates
- dev: based on alpha, and also contains user's image
- prow-xxx: image list used for prow tests. Linux only right now.
overlays: it has the version specific setup.
- alpha: kustomize will generate alpha version of the drivers which includes both Linux and Windows
- stable: kustomize will generate alpha version of the drivers which only has Linux.
- dev: this is based on alpha version and images are updated with appropriate versions.
- prow-gke-release-xxx: this is based on stable version and images are updated with appropriate versions. It is used for CI testing only.

This PR also updates kustomize latest versino. "bases" is deprecated, use "resources" instead.

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

jingxu97 · 2020-06-04T19:06:21Z

cc @msau42 @verult

msau42 · 2020-06-04T20:45:54Z

deploy/kubernetes/deploy-driver.sh


+if [[ ${DEPLOY_OS} = "mixed" ]]; then


I would suggest to simplify things and just always include both linux and windows node specs. I guess we may have a problem in the beginning where the windows spec is not available for staging/stable.

What if the kustomization.yaml in image_setup/{dev/staging/stable} apppropriately pulls in node_base/windows as needed?

Then we don't actually need to auto-generate a top level kustomization.yaml and can continue to use the appropriate image_setup/X/kustomization.yaml

At first, I thought with multiple bases, it is easy to have arbitrary combination, e.g. linux + stable_image, windows + alpha_image. But the image part does not work as expected in multiple bases. I will simply this with one combined driver instead of having a complicated script here.

msau42 · 2020-06-04T20:49:44Z

deploy/kubernetes/kustomization/image_setup/alpha/kustomization.yaml

@@ -0,0 +1,6 @@
+apiVersion: kustomize.config.k8s.io/v1beta1


naming nit: we have more than just image version patches in these directories. We may enable new features as well.

Maybe I would still keep the directory name as "overlays". So the main change is that the node deployment is separated from controller deployment, but we still use the kustomization.yaml from the "overlays" directory to determine which version of the driver to deploy.

msau42 · 2020-06-04T20:53:43Z

deploy/kubernetes/kustomization/kustomization.yaml

+namespace:
+  gce-pd-csi-driver
+bases:
+- base_setup


Maybe call this one controller_setup

msau42 · 2020-06-05T00:23:30Z

deploy/kubernetes/base/controller_setup/controller.yaml

@@ -82,5 +84,10 @@ spec:
        - name: cloud-sa-volume
          secret:
            secretName: cloud-sa
+      # https://kubernetes.io/docs/concepts/configuration/taint-and-toleration/


From the other PR, I think we should not include this otherwise the controller won't restart if the node becomes unhealthy. It's only really meant for DaemonSets.

right, forgot to update it.

msau42 · 2020-06-05T00:25:28Z

deploy/kubernetes/base/node_setup/windows/node.yaml

+spec:
+  selector:
+    matchLabels:
+      app: gcp-compute-persistent-disk-csi-driver


We may need linux and windows DaemonSets to use different labels. Otherwise the linux DaemonSet may start managing the windows Pods, and vice versa.

msau42 · 2020-06-05T00:27:30Z

deploy/kubernetes/overlays/stable/kustomization.yaml

 images:
- name: gke.gcr.io/gcp-compute-persistent-disk-csi-driver
  # Don't change stable image without changing pdImagePlaceholder in


Keep this comment with gcp-compute-persistent-disk-csi-driver

msau42 · 2020-06-05T00:29:19Z

deploy/kubernetes/base/node_setup/kustomization.yaml

+  gce-pd-csi-driver
+resources:
+- linux/node.yaml
+- windows/node.yaml


This means windows deployment automatically gets added to stable. Is that what we want? Or should we first add windows to the alpha overlay, and eventually when it becomes stable, we add it to the base?

Another alternative is to have the overlays directly specify the os/node.yaml resources that they want.

Thanks to @Liujingfang1, we can make image update lists reusable for different versions. I think with this change, it can customize every possible way easily.

jingxu97 · 2020-06-05T15:30:16Z

/test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration

jingxu97 · 2020-06-05T16:25:43Z

/test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration

msau42 · 2020-06-05T22:04:39Z

deploy/kubernetes/base/images/image.yaml

@@ -0,0 +1,55 @@
+apiVersion: builtin
+kind: ImageTagTransformer


What is the difference between using this and the images field that's in the kustomization?

Before, we have append these images with some base. For example, in previous structure, we list most of images in stable version. And stable version needs a base, which point to the base that has both linux and windows setup. Now if all other versions e.g., alpha, dev need to base on stable, all of them must share the same base setup as stable (which contains both linux and windows.). If for alpha, we only want to have linux as base instead of using stable as a base, we have to copy the same image list to the alpha version.
Now with this ImageTagTransformer, we can do any combination easily. The image is just like a resource to use. We can allow alpha to use mixed setup as base, plus images, while stable to use only linux setup, plus images.

And stable version needs a base, which point to the base that has both linux and windows setup.

Isn't it the opposite? Stable has just linux, and alpha has linux + windows? So everything can still continue to be off of stable, and then override the images. Unless the issue is you can't have 1 kustomization.yaml with images that uses another kustomization.yaml that also has images as its base?

I think I used the wrong example. My main point is this way we can have arbitrary combination of os + image as needed. This will give the flexibility in case we do want e.g., windows+image for security setup reason (we don't want to have linux security set up mix with it. We might have unnecessary security compromise from linux security policy which we don't actually need in windows cluster). And putting all common things in the same place seems clean.

The tags in this file are only for the "stable" overlay. If we want to follow this model, should we have a file for the images in every overlay?

msau42 · 2020-06-05T22:09:16Z

deploy/kubernetes/base/node_setup/windows/node.yaml

+        kubernetes.io/os: windows
+      containers:
+        - name: csi-driver-registrar
+          image: gcr.io/k8s-staging-csi/csi-node-driver-registrar:amd64-windows-v20200428-v1.3.0-26-g510710d5


These images should be substituted in the alpha overlay

we don't have another image yet, I think. Currently I see this is in staging. We need to check when it is able to release.

Yes, but I think we should follow the pattern of the linux node.yaml and not specify a tag in the base, and instead override the tag in the kustomization.yaml

msau42 · 2020-06-10T00:14:41Z

/approve
Would like to get at least one more set of eyes on this since it's changing the structure a bit. Also I still had one outsanding question on the ClusterRole

k8s-ci-robot · 2020-06-10T00:14:51Z

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This pull-request has been approved by: jingxu97, msau42

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jingxu97 · 2020-06-10T00:48:01Z

finally, the test passed. PTAL @msau42

jingxu97 · 2020-06-10T00:57:43Z

@verult could you please review this again since lots of changes from last time.

verult

I have some difficulties picking out the subtleties of why this structure is beneficial. If it's not too much effort, if you could link to previous PRs and/or write a high-level compare and contrast the different approaches you tried, it will not only help me understand more easily but also acts as a justification for future devs.

verult · 2020-06-10T03:16:22Z

deploy/kubernetes/images/dev/kustomization.yaml

+  gce-pd-csi-driver
+resources:
+- image.yaml
+- ../alpha/


If we ever need to change the tag for node-driver-registrar in the dev overlay, should it use the image name in base or alpha?

if it is only for dev, then change the image in the image.yaml file under /dev

In this dev/image.yaml, do we set imageTag.name to the one in base (gke.gcr.io/gcp-compute-persistent-disk-csi-driver-win) or alpha (gke.gcr.io/k8s-staging-csi/csi-node-driver-registrar-win)? And does the answer depend on other factors, like maybe the ordering of items in kustomization.yaml?

I'm not sure if we'll ever need to update node registrar tag name, so we can potentially defer this question until that happens.

there is no image name gke.gcr.io/gcp-compute-persistent-disk-csi-driver-win (this is for windows) in base (stable).
Generally, the following can happen
in stable, change image name --> nameA
in alpha, change image name --> nameB
if alpha is also based on stable, I think the final image name will be nameA.
Or,
in stable, change image name --> nameA
in alpha, change image nameA --> nameB
if alpha is also based on stable, I think the final image name will be nameB.

This is using ImageTagTransformer. I also tested using both ImageTagTransformer and images section directly in kustomization.yaml. The latter (images section) seems taking the final effect.
There are so many ways to construct this, we just have to try it out.

jingxu97 · 2020-06-10T04:11:09Z

Previously, we have the following structure. Compared to the current one, the main problem here is linux and windows cannot share the image list (stable). With current structure, image list can be shared. Basically once it is setup, future update do not need to touch overlays. For changes that are related to controller or cluster_setup, it does to base/controller_setup. Any change related to node yaml files go to base/node_setup (linux or windows). Any changes related to images go to images (stable, alpha, dev etc.). In overlay, we could set up a overlay that is a combination of base + node_setup + image. e.g,
base + node/linux + image/dev
base + node/windows + image/alpha.
base + node/linux + node/windows + image/stable

base
*. controller.yaml
*. setup-cluster.yaml
overlays
- linux
  - base: psp.yaml, node.yaml
  - stable: image list
  - dev: yaml and image list
  - alpha: dev
    ..
- windows
  * base: psp.yaml, node.yaml
  * stable: image list

mattcary · 2020-06-10T17:48:50Z

deploy/kubernetes/base/controller_setup/cluster_setup.yaml

@@ -147,33 +147,6 @@ roleRef:
  apiGroup: rbac.authorization.k8s.io



I think it would be more clear to name the subdirectories base/controller and base/node. cluster_setup.yaml seems truly setup config, as it's only applied once, whereas controller.yaml is can be done multiple times if you take the deployment up and down. But then why is it in a controller_setup directory?

So I think it would be better to just have base/controller and base/node.

I'm actually not even sure it's worth it to split the controller and node into separate directories as there aren't that many files and it makes it harder to get a comprehensive view of what's actually going on as you have to drill down. Having node_linux and node_windows is probably sufficient for organization.

the reason we have separate dir between controller and node is that we want to be able to pick a combination of base + os + image as explained in comment here #520 (comment)
I think with one flat structure, we cannot do this.

I see. I'm not very familiar with kustomize. Is the issue that you can't do something like the following?

resources:

../../base/*.yaml

../../base/node_linux

In that case I agree the separate controller directory seems necessary. It would still be possible to simplify and have base/{controller,node_linux,node_windows} which will improve the browsing experience.

I also still think that removing the _setup suffix from the directory names would be a nice improvement.

sure, I updated the name.

mattcary · 2020-06-10T18:13:48Z

deploy/kubernetes/base/node_setup/linux/psp.yaml

@@ -0,0 +1,27 @@
+apiVersion: policy/v1beta1


I'm a little uncomfortable that the PSPs are apparently identical, but repeated. Can we hoist the common linux & windows config into base/node/?

Linux and Windows have different psp names. That's why I cannot make the common into base

~~I think the paths are different. One possibility is to put the shared parts into base and the separate linux & windows parts into separate overlays, but the current form might be cleaner imo~~

Oops sorry I was looking at the latest push and GitHub wouldn't show me the previous version of the file. Not sure if this still applies

After digging more, I think it is still possible to share psp, we could use namesuffix. But it also means we need to add a separate dir (and also kustomization file) for psp in order to do that.
/node/common/psp.yaml
/node/common/kustomization.yaml
/node/linux/kustomization.yaml
node/windows/kustomization.yaml
If it is preferable, then I can update it this way.

My vote is keep it the way it is because more layers = more complexity

Mmm, yeah, I agree, we don't need another directory.

Too bad, I don't look forward to keeping the linux & windows PSP specs in sync. But I agree what you currently have seems like the least bad option.

mattcary · 2020-06-10T18:25:44Z

deploy/kubernetes/images/stable/image.yaml

+  name: imagetag-gcepd-driver
+imageTag:
+  name: gke.gcr.io/gcp-compute-persistent-disk-csi-driver
+  # Don't change stable image without changing pdImagePlaceholder in


Shouldn't this comment go above name:? This doesn't have anything to do with the tag.

And really probably the test can now be changed to create the appropriate ImageTagTransformer rather than the cruel and dirty hack it currently does. If you agree could you create an issue for that? (might be a good intern task)

Could you point me the trick part you mean that test is currently using?

Well, the trick is where we rely on people reading a comment to not break all the tests ;)

test/k8s-integration/driver.go in installDriver is where we rely on the image name being what's in the stable repo. Wouldn't it be better to have the test make an ImageTagTransformer and deploy its own overlay so that it works the same as the rest of the kustomize, rather than depend on stable being set to a certain value? (if that's indeed what's going on; the fact that it's not obvious what is going on is another problem).

Yes, the test infra is modifying the specified kustomization and replacing the image tag. I agree we can improve the test to instead create a test overlay with an imagetagtransformer. But this also goes back to @verult's question about order of operations and when does the name get changed because dev/staging/stable can all use different image registries.

Let me think out loud briefly. I haven't used kustomize much so I could be missing something.

Do we want the yaml in base/ to be meaningful, or is it only supported by deploying through customize? In that case we could replace the images in base/ with placeholders like ATTACHER_IMAGE and have a newName in all of the image transformers. Then it's clear what is being changed.

With respect to the ordering of multiple changes, though, it looks like there's a bug in kustomize. If one applies two patches that refer to the same field, kustomize errors. But if one applies multiple image transformations, the last one wins (as defined by the list in the kustomization.yaml in the transformer directory).

So that's unfortunate... I can ask in the kustomize repo to see if that really is a bug or for some reason WAI. From our perspective, we just have to be careful I guess, and trace the order of things from kustomization files starting in the overlay.

I think using placeholders like ATTACHER_IMAGE sounds good to me. All the image name placeholder used in /base should not be touched.
All the image replacement will be done in /images dir. For testing, we only need to touch/replace /images/dev/image.yaml file to create ImageTagTransformer when necessary.

Also I suggest to modify placeholder in a different PR. This PR has already gone through lots of changes.

SGTM for doing that in a different PR

I've filed kubernetes-sigs/kustomize#2590 about conflict with image transformers.

Thanks! I cc @Liujingfang1 who is the expert in this area.

mattcary · 2020-06-10T18:26:35Z

deploy/kubernetes/images/alpha/image.yaml

+  name: imagetag-gcepd-driver-alpha-win
+imageTag:
+  name: gke.gcr.io/gcp-compute-persistent-disk-csi-driver-win
+  # Don't change stable image without changing pdImagePlaceholder in


This comment doesn't belong here in the alpha yaml?

mattcary · 2020-06-10T18:26:45Z

deploy/kubernetes/images/alpha/image.yaml

+  name: imagetag-node-registrar-win
+imageTag:
+  name: gke.gcr.io/k8s-staging-csi/csi-node-driver-registrar-win
+  # Don't change stable image without changing pdImagePlaceholder in


and this one

verult · 2020-06-10T21:58:32Z

deploy/kubernetes/install-kustomize.sh

 fi
+curl -s "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh"  | bash
+mv kustomize ${INSTALL_DIR}
+echo "install kustomizer"


kustomizer -> Kustomize

verult · 2020-06-10T22:01:23Z

deploy/kubernetes/base/node_setup/linux/psp.yaml

@@ -0,0 +1,27 @@
+apiVersion: policy/v1beta1


My vote is keep it the way it is because more layers = more complexity

verult

LGTM, the benefits make sense. Thanks for clarifying!

mattcary · 2020-06-10T23:25:59Z

deploy/kubernetes/images/stable/image.yaml

+apiVersion: builtin
+kind: ImageTagTransformer
+metadata:
+  name: imagetag-csi-rpovisioner


typo: rpovisioner

jingxu97 · 2020-06-11T02:36:09Z

/retest

This can work for both linux and windows Also update to the latest version of kustomize bases is deprecated, use resources instead.

mattcary · 2020-06-11T15:50:10Z

/lgtm

If there's agreement on putting the image placeholders in a follow-on CL I'm happy enough with this now.

k8s-ci-robot · 2020-06-11T15:50:16Z

@mattcary: changing LGTM is restricted to collaborators

In response to this:

/lgtm

If there's agreement on putting the image placeholders in a follow-on CL I'm happy enough with this now.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

msau42 · 2020-06-11T17:41:49Z

/lgtm

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jingxu97 mentioned this pull request Jun 11, 2020

Add windows driver installation support #510

Closed

New kustomization for pd driver

def8dae

This can work for both linux and windows Also update to the latest version of kustomize bases is deprecated, use resources instead.

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verult mentioned this pull request Jul 25, 2020

Adding Kustomize structure in deployment README #562

Merged

saad-ali mentioned this pull request Jul 29, 2020

Pre-stop hook to delete registration socket isn't working #365

Closed

		@@ -0,0 +1,55 @@
		apiVersion: builtin
		kind: ImageTagTransformer

		@@ -147,33 +147,6 @@ roleRef:
		apiGroup: rbac.authorization.k8s.io

New kustomization for pd driver #520

New kustomization for pd driver #520

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