feat: add annotation and label filters to Ambassador Host Source #2633

KyleMartin901 · 2022-03-09T11:48:04Z

This change makes the Ambassador Host source respect the External-DNS annotation-filter and label-filter allowing for an Ambassador Host resource to specify what External-DNS deployment to use when there are multiple External-DNS deployments within the same cluster. Before this change if you had two External-DNS deployments within the cluster and used the Ambassador Host source the first External-DNS to process the resource will create the record and not the one that was specified in the filter annotation.

Annotation Fillter

I added the filterByAnnotations function so that it matched the same way the other sources have implemented annotation filtering. I didn't add the controller check only because I wanted to keep this change to implementing the annotationFilter.

I added Endpoint tests to validate that the filterByAnnotations function works as expected. Again these tests were based of the Endpoint tests that other sources use. To keep the tests simpler I only allow for a single load balancer to be used.

Example: Create two External-DNS deployments 1 public and 1 private and set the Ambassador Host to use the public External-DNS using the annotation filter.

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: external-dns-private
spec:
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: external-dns-private
  template:
    metadata:
      labels:
        app: external-dns-private
      annotations:
        iam.amazonaws.com/role: {ARN} # AWS ARN role
    spec:
      serviceAccountName: external-dns
      containers:
      - name: external-dns
        image: k8s.gcr.io/external-dns/external-dns:latest
        args:
        - --source=ambassador-host
        - --domain-filter=example.net # will make ExternalDNS see only the hosted zones matching provided domain, omit to process all available hosted zones
        - --provider=aws
        - --policy=upsert-only # would prevent ExternalDNS from deleting any records, omit to enable full synchronization
        - --aws-zone-type=private # only look at public hosted zones (valid values are public, private or no value for both)
        - --registry=txt
        - --txt-owner-id= {Hosted Zone ID} # Insert Route53 Hosted Zone ID here
        - --annotation-filter=kubernetes.io/ingress.class in (private)
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: external-dns-public
spec:
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: external-dns-public
  template:
    metadata:
      labels:
        app: external-dns-public
      annotations:
        iam.amazonaws.com/role: {ARN} # AWS ARN role
    spec:
      serviceAccountName: external-dns
      containers:
      - name: external-dns
        image: k8s.gcr.io/external-dns/external-dns:latest
        args:
        - --source=ambassador-host
        - --domain-filter=example.net # will make ExternalDNS see only the hosted zones matching provided domain, omit to process all available hosted zones
        - --provider=aws
        - --policy=upsert-only # would prevent ExternalDNS from deleting any records, omit to enable full synchronization
        - --aws-zone-type= # only look at public hosted zones (valid values are public, private or no value for both)
        - --registry=txt
        - --txt-owner-id= {Hosted Zone ID} # Insert Route53 Hosted Zone ID here
        - --annotation-filter=kubernetes.io/ingress.class in (public)
---
apiVersion: getambassador.io/v3alpha1
  kind: Host
  metadata:
    name: your-hostname
    annotations:
      external-dns.ambassador-service: emissary-ingress/emissary
      kubernetes.io/ingress.class: public
  spec:
		acmeProvider:
      authority: none
		hostname: your-hostname.example.com

Fixes #2632

Label Filter

Currently, the --label-filter flag can only be used to filter CRDs, Ingress, Service and Openshift Route objects that match the label selector passed through that flag. This change extends the functionality to the Ambassador Host type object.

When the flag is not specified the default value is labels.Everything() which is an empty string, the same as before.
Annotation based filter is inefficient because the filtering has to be done in the controller instead of the API server like with label filtering. The Annotation based filtering has been left in for legacy reasons so the Ambassador Host source can be used in conjunction with the other sources that don't yet support label filtering.

It is possible to use label based filtering with annotation based filtering so you can initially filter by label and then filter the returned hosts by annotation. This is not recommended

Fixes #2761

Checklist

Unit tests updated
End user documentation updated

linux-foundation-easycla · 2022-03-09T11:48:07Z

The committers listed above are authorized under a signed CLA.

✅ login: KyleMartin901 / name: Kyle (9a573f5, c7ae7f1, 7da6898, 671157c)

k8s-ci-robot · 2022-03-09T11:48:12Z

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KyleMartin901 · 2022-05-16T04:34:27Z

I have also added the label filter to the Ambassador host source as per suggestion by @alebedev87 in #2043 (comment)

alebedev87

Overall LGTM, just some cosmetic comments.

alebedev87 · 2022-06-01T13:41:27Z

source/ambassador_host.go

+	// Filter Ambassador Hosts
+	ambassadorHosts, err = sc.filterByAnnotations(ambassadorHosts)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to filter Ambassador Hosts")


Suggested change

return nil, errors.Wrap(err, "failed to filter Ambassador Hosts")

return nil, errors.Wrap(err, "failed to filter Ambassador Hosts by annotation")

alebedev87 · 2022-06-01T13:47:05Z

source/ambassador_host_test.go

+			title:           "no host",
+			targetNamespace: "",
+			labelSelector: labels.Everything(),


Suggested change

title: "no host",

targetNamespace: "",

labelSelector: labels.Everything(),

title: "no host",

labelSelector: labels.Everything(),

Just to safe 1 line from each test case which doesn't need the target namespace.

BTW I didn't see any test case using the targetNamespace, specifying it is supposed to filter hosts too.

Sorry forgot to add the test case in. I was going to test to make sure the Ambassador host was only added if it is within the External DNS targeted namespace like the following sources do

Service

Istio Gateway

Ingress

Contour HTTPProxy

I have added the Target Namespace test now 51e3633

Thanks for adding the test case for the namespace!

The other tests cases can remove targetNamespace field as it's set to the empty string by default - will save 1 line for each line.

alebedev87 · 2022-06-01T13:58:36Z

source/ambassador_host_test.go

+			expectError: true,
+		},
+		{
+			title:            "valid matching annotation filter label",


Do we need this test case? The one with the filter expression has already tested the parsing into the labelSelector.

Up to you again copied the test from Contour, Ingress, Istio Gateway and the service tests. Happy to remove it if you would like.

Since it doesn't bring any added value, I'd prefer to remove it - smaller is simpler for the further maintenance.

alebedev87 · 2022-06-01T13:59:08Z

source/ambassador_host_test.go

+		{
+			title:            "valid matching label filter expression",
+			targetNamespace:  "",
+			// annotationFilter: "kubernetes.io/ingress.class in (external-ingress)",


Can be removed if not used.

Cleaned this up 1629661 sorry forgot to go through and make sure was all clean

alebedev87 · 2022-06-01T14:00:01Z

source/ambassador_host_test.go

+					hostname:  "fake1.org",
+					annotations: map[string]string{
+						"external-dns.ambassador-service": "emissary-ingress/emissary",
+						"kubernetes.io/ingress.class":     "external-ingress",


This annotation can be removed as we don't use any annotation filter, just to keep the test to absolute minimum.

Thanks I have removed the kubernetes.io/ingress.class annotations from the label tests where they weren't being used. I still need to keep the external-dns.ambassador-service annotation as that is how External DNS knows to assign the DNS record to the correct Ambassador Host service/endpoint.

alebedev87 · 2022-06-01T14:02:45Z

source/ambassador_host_test.go

+			expected: []*endpoint.Endpoint{},
+		},
+		{
+			title:            "valid matching label filter expression for single host",


This test case seems to be a "superset" of valid matching label filter expression one, so why not keeping only this one?

I have now removed valid matching label filter expression as you are correct I am already matching valid label within the valid matching label filter expression for single host test.

Sorry I was trying to match tests like what was done within the annotations without really thinking about it.

alebedev87 · 2022-06-01T14:06:42Z

source/ambassador_host_test.go

+		ti := ti
+		t.Run(ti.title, func(t *testing.T) {
+			// Create a slice of Ambassador Hosts
+			ambassadorHosts := make([]*ambassador.Host, 0)


Not a big deal at all but I've seen all the possible ways of creating a slice of ambassador hosts in this PR:

var ambassadorHosts []*ambassador.Host --- filteredList := []*ambassador.Host{} --- ambassadorHosts := make([]*ambassador.Host, 0)

:)

Sorry about that copy and paste issues. Thanks for picking that up for me totally missed it

I have cleaned this up in 2482ef5 decided to use the short declaration operator

@alebedev87

…notation As suggested by @alebedev87 kubernetes-sigs#2633 (comment) Co-authored-by: Andrey Lebedev <alebedev87@gmail.com>

@alebedev87

Correcting the inconsistancy in the way an empty slice of Ambassador Hosts were declared so it is clean and clearer. Thanks to @alebedev87 for catching this kubernetes-sigs#2633 (comment)

KyleMartin901 · 2022-06-07T00:42:23Z

@alebedev87 thanks for picking up those issues.

I wasn't sure on the process of adding in the changes if it is preferred for the changes to be added in as new commits or squashed so the PR still only had the two commits for adding annotation filter and label filter. I have just added them as seperate commits so it is easy to squash if that's what is preferred. Let me know if you would prefer me to squash them or happy as is.

@alebedev87

Removing the `valid matching label filter expression` test in favour of just using `valid matching label filter expression for single host` as it is testing the same thing that a Ambassador Host with a valid label is matched. Disscussed with @alebedev87 in kubernetes-sigs#2633 (comment)

@alebedev87

Removing the annoations that are not required for the label tests to keep the test to an absolute minimum based on conversations with @alebedev87 kubernetes-sigs#2633 (comment)

…notation As suggested by alebedev87 in kubernetes-sigs#2633 (comment) Co-authored-by: Andrey Lebedev <alebedev87@gmail.com>

Correcting the inconsistancy in the way an empty slice of Ambassador Hosts were declared so it is clean and clearer. Thanks to alebedev87 for catching this in kubernetes-sigs#2633 (comment)

Removing the `valid matching label filter expression` test in favour of just using `valid matching label filter expression for single host` as it is testing the same thing that a Ambassador Host with a valid label is matched. Disscussed with alebedev87 in kubernetes-sigs#2633 (comment)

Removing the annoations that are not required for the label tests to keep the test to an absolute minimum based on conversations with alebedev87 kubernetes-sigs#2633 (comment)

alebedev87 · 2022-06-09T21:40:25Z

@KyleMartin901: I'm not aware of any strict rules about the commits. However I don't think that the commits made to address the review remarks really need to be upstream.

mloiseleur · 2024-01-15T07:20:59Z

Since author is not answering, I'm closing this PR.
Feel free to re-open it or open a new one if you need it.
/close

k8s-ci-robot · 2024-01-15T07:21:04Z

@mloiseleur: Closed this PR.

In response to this:

Since author is not answering, I'm closing this PR.
Feel free to re-open it or open a new one if you need it.
/close

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KyleMartin901 · 2024-01-15T07:55:19Z

Sorry I am just getting back from 6 weeks holiday where I had my notifications turned off. I’ll fix up the issues this weekend @mloiseleur

mloiseleur · 2024-01-15T08:46:24Z

sure, no problem
/reopen

k8s-ci-robot · 2024-01-15T08:46:29Z

@mloiseleur: Reopened this PR.

In response to this:

sure, no problem
/reopen

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This change makes the Ambassador Host source respect the External-DNS annotationFilter allowing for an Ambassador Host resource to specify what External-DNS deployment to use when there are multiple External-DNS deployments within the same cluster. Before this change if you had two External-DNS deployments within the cluster and used the Ambassador Host source the first External-DNS to process the resource will create the record and not the one that was specified in the filter annotation. I added the `filterByAnnotations` function so that it matched the same way the other sources have implemented annotation filtering. I didn't add the controller check only because I wanted to keep this change to implementing the annotationFilter. I added Endpoint tests to validate that the filterByAnnotations function works as expected. Again these tests were based of the Endpoint tests that other sources use. To keep the tests simpler I only allow for a single load balancer to be used. Example: Create two External-DNS deployments 1 public and 1 private and set the Ambassador Host to use the public External-DNS using the annotation filter. ``` --- apiVersion: apps/v1 kind: Deployment metadata: name: external-dns-private spec: strategy: type: Recreate selector: matchLabels: app: external-dns-private template: metadata: labels: app: external-dns-private annotations: iam.amazonaws.com/role: {ARN} # AWS ARN role spec: serviceAccountName: external-dns containers: - name: external-dns image: k8s.gcr.io/external-dns/external-dns:latest args: - --source=ambassador-host - --domain-filter=example.net # will make ExternalDNS see only the hosted zones matching provided domain, omit to process all available hosted zones - --provider=aws - --policy=upsert-only # would prevent ExternalDNS from deleting any records, omit to enable full synchronization - --aws-zone-type=private # only look at public hosted zones (valid values are public, private or no value for both) - --registry=txt - --txt-owner-id= {Hosted Zone ID} # Insert Route53 Hosted Zone ID here - --annotation-filter=kubernetes.io/ingress.class in (private) --- apiVersion: apps/v1 kind: Deployment metadata: name: external-dns-public spec: strategy: type: Recreate selector: matchLabels: app: external-dns-public template: metadata: labels: app: external-dns-public annotations: iam.amazonaws.com/role: {ARN} # AWS ARN role spec: serviceAccountName: external-dns containers: - name: external-dns image: k8s.gcr.io/external-dns/external-dns:latest args: - --source=ambassador-host - --domain-filter=example.net # will make ExternalDNS see only the hosted zones matching provided domain, omit to process all available hosted zones - --provider=aws - --policy=upsert-only # would prevent ExternalDNS from deleting any records, omit to enable full synchronization - --aws-zone-type= # only look at public hosted zones (valid values are public, private or no value for both) - --registry=txt - --txt-owner-id= {Hosted Zone ID} # Insert Route53 Hosted Zone ID here - --annotation-filter=kubernetes.io/ingress.class in (public) --- apiVersion: getambassador.io/v3alpha1 kind: Host metadata: name: your-hostname annotations: external-dns.ambassador-service: emissary-ingress/emissary kubernetes.io/ingress.class: public spec: acmeProvider: authority: none hostname: your-hostname.example.com ``` Fixes kubernetes-sigs#2632

Currently the `--label-filter` flag can only be used to filter CRDs, Ingress, Service and Openshift Route objects which match the label selector passed through that flag. This change extends the functionality to the Ambassador Host type object. When the flag is not specified the default value is `labels.Everything()` which is an empty string, the same as before. Annotation based filter is inefficient because the filtering has to be done in the controller instead of the API server like with label filtering. The Annotation based filtering has been left in for legacy reasons so the Ambassador Host source can be used inconjunction with the other sources that don't yet support label filltering. It is possible to use label based filltering with annotation based filltering so you can initially filter by label then filter the returned hosts by annotation. This is not recomended

Add that the Ambassador Host source now supports both annotation and label filltering.

KyleMartin901 · 2024-01-22T03:52:08Z

@mloiseleur thanks for reopening the PR and giving me the time to rebase and update the docs. I have now pushed those changes, let me know if there is anything else you would like me to do.

mloiseleur · 2024-01-22T10:36:22Z

/ok-to-test
/retitle feat: add annotation and label filters to Ambassador Host Source

Add the expected record type to the Ambassador Host source tests so they pass.

KyleMartin901 · 2024-01-22T12:34:01Z

@mloiseleur sorry about the failed tests, I have fixed them up by adding the now required record type. Sorry I was lazy and just did the rebase and didn't rerun the tests but I have now run the tests and they are all passing. I added a lazy commit let me know if you want it squashed in or changed.

mloiseleur · 2024-02-11T10:26:16Z

/lgtm
/label tide/merge-method-squash

szuecs · 2024-04-27T18:18:35Z

/approve

k8s-ci-robot · 2024-04-27T18:18:41Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: szuecs

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k8s-ci-robot · 2024-04-27T18:18:43Z

PR needs rebase.

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k8s-ci-robot · 2024-04-28T10:44:14Z

@KyleMartin901: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-external-dns-licensecheck	`671157c`	link	unknown	`/test pull-external-dns-licensecheck`
pull-external-dns-unit-test	`671157c`	link	unknown	`/test pull-external-dns-unit-test`

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mloiseleur · 2024-04-30T07:03:58Z

@KyleMartin901 This PR has been approved. It means that it just needs a rebase, to pass tests and it will be merged.

KyleMartin901 · 2024-04-30T07:28:19Z

Thanks @mloiseleur i will attempt to get this done this week. Looks like someone got tests merged in before mine so going to refactor to match what has already been merged

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k8s-ci-robot requested review from Raffo and seanmalloy March 9, 2022 11:48

k8s-ci-robot added cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. and removed cncf-cla: no Indicates the PR's author has not signed the CNCF CLA. labels Mar 9, 2022

KyleMartin901 mentioned this pull request Apr 27, 2022

Add annotationFilter to Ambassador Hosts #2043

Closed

KyleMartin901 force-pushed the add-annotation-fillter-to-ambassador-host-source branch from 8c6851c to a427434 Compare May 16, 2022 01:47

k8s-ci-robot added size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. and removed size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels May 16, 2022

KyleMartin901 changed the title ~~Add annotation filter to Ambassador Host Source~~ Add annotation and label filters to Ambassador Host Source May 16, 2022

alebedev87 reviewed Jun 1, 2022

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KyleMartin901 force-pushed the add-annotation-fillter-to-ambassador-host-source branch from f10f6eb to 25aff9e Compare June 2, 2022 06:32

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KyleMartin901 force-pushed the add-annotation-fillter-to-ambassador-host-source branch from f166698 to ed61d9b Compare June 7, 2022 03:15

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KyleMartin901 force-pushed the add-annotation-fillter-to-ambassador-host-source branch from f702e14 to eda671a Compare June 19, 2022 14:49

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k8s-ci-robot closed this Jan 15, 2024

k8s-ci-robot reopened this Jan 15, 2024

KyleMartin901 added 2 commits January 22, 2024 14:36

KyleMartin901 force-pushed the add-annotation-fillter-to-ambassador-host-source branch from 86da547 to c7ae7f1 Compare January 22, 2024 03:44

Update Ambassador Host source docs

7da6898

Add that the Ambassador Host source now supports both annotation and label filltering.

k8s-ci-robot changed the title ~~Add annotation and label filters to Ambassador Host Source~~ feat: add annotation and label filters to Ambassador Host Source Jan 22, 2024

k8s-ci-robot added the ok-to-test Indicates a non-member PR verified by an org member that is safe to test. label Jan 22, 2024

Add record type to Ambassador Host source tests.

671157c

Add the expected record type to the Ambassador Host source tests so they pass.

k8s-ci-robot added the tide/merge-method-squash Denotes a PR that should be squashed by tide when it merges. label Feb 11, 2024

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	return nil, errors.Wrap(err, "failed to filter Ambassador Hosts")
	return nil, errors.Wrap(err, "failed to filter Ambassador Hosts by annotation")

feat: add annotation and label filters to Ambassador Host Source #2633

Are you sure you want to change the base?

feat: add annotation and label filters to Ambassador Host Source #2633

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KyleMartin901 commented Mar 9, 2022 • edited Loading

Annotation Fillter

Label Filter

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