[exporter/loadbalancingexporter] support k8s service resolver #22776

fyuan1316 · 2023-05-25T10:29:40Z

Description:

Add k8s service resolver for exporter/loadbalancingexporter

The exporter/loadbalancingexporter component currently supports both static and dns resolvers, and does not currently support the ability to load balance pods when the collector application is running in a kubernetes environment. (Backends address discovery is achieved by monitoring kubernetes endpoints resources). This pr provides that capability.

Link to tracking Issue:
suitable for scenarios where services are located in a k8s cluster #18412

Testing:

Documentation:

linux-foundation-easycla · 2023-05-25T10:29:45Z

The committers listed above are authorized under a signed CLA.

✅ login: fyuan1316 / name: fyuan1316 (d201b41)

fyuan1316 · 2023-05-31T05:15:42Z

@codeboten Hi 😄 I submitted a pull request a few days ago and have not heard back from you, do you need more information or have another request? Thank you for your time!

github-actions · 2023-06-14T05:19:47Z

This PR was marked stale due to lack of activity. It will be closed in 14 days.

fyuan1316 · 2023-06-14T06:27:47Z

@jpkrohling
I would like to know if it is feasible to add a k8s resolver? If there are other better ways to support this scenario, I'd love to learn more.
I'm new here, any feedback and guidance would be greatly appreciated.

codeboten

Thanks for the PR @fyuan1316, pinging @jpkrohling as the code owner to review the code

jpkrohling

This looks really cool, thank you! There are a few comments, and I couldn't test it manually as I couldn't build this due to:

go: open /home/jpkroehling/Projects/github.com/open-telemetry/opentelemetry-collector-contrib/connector/routingconnector/go.mod: no such file or directory
go: open /home/jpkroehling/Projects/github.com/open-telemetry/opentelemetry-collector-contrib/connector/routingconnector/go.mod: no such file or directory
go test -race -timeout 300s -parallel 4 --tags="" ./...
go: open /home/jpkroehling/Projects/github.com/open-telemetry/opentelemetry-collector-contrib/connector/routingconnector/go.mod: no such file or directory
make: *** [Makefile.Common:98: test] Error 1

I'll give it another try once you rebase this.

exporter/loadbalancingexporter/loadbalancer_test.go

jpkrohling · 2023-06-23T18:55:30Z

exporter/loadbalancingexporter/loadbalancer_test.go

+	var tests = []struct {
+		name string
+		cfg  *Config
+		want *loadBalancerImp


You can remove this one

jpkrohling · 2023-06-23T18:55:40Z

exporter/loadbalancingexporter/loadbalancer_test.go

+					},
+				},
+			},
+			want:    nil,


If both tests are using the same value(nil), you don't need it here.

jpkrohling · 2023-06-23T18:56:30Z

exporter/loadbalancingexporter/loadbalancer_test.go

+		t.Run(tt.name, func(t *testing.T) {
+			p, err := newLoadBalancer(exportertest.NewNopCreateSettings(), tt.cfg, nil)
+
+			if tt.wantErr != nil {


You can replace the if/else here with:

assert.Equal(t, tt.wantErr)

exporter/loadbalancingexporter/resolver_k8s.go

jpkrohling · 2023-06-23T19:25:43Z

exporter/loadbalancingexporter/resolver_k8s.go

+	case *corev1.Endpoints:
+		endpoints = convertToEndpoints(object)
+	default: // unsupported
+		return


If this happens, you definitely want to know about. Log a warn here.

done ( log warn in unsupported branch. )

jpkrohling · 2023-06-23T19:26:18Z

exporter/loadbalancingexporter/resolver_k8s.go

+	}
+	h.logger.Debug("onAdd check", zap.Bool("changed", changed))
+	if changed {
+		h.callback(context.TODO())


Either a Background(), or something with a timeout. Same on other similar places.

jpkrohling · 2023-06-23T19:29:19Z

exporter/loadbalancingexporter/resolver_k8s.go

+		endpoints := convertToEndpoints(newEps)
+		changed := false
+		for _, ep := range endpoints {
+			if _, loaded := h.endpoints.LoadOrStore(ep, ep); !loaded {


Instead of storing a map[string]string, you could store a map[string]bool, and set this value here to true. You'd save some space with that, while still having the semantics you need.

jpkrohling · 2023-06-23T19:30:19Z

exporter/loadbalancingexporter/README.md

@@ -66,6 +66,12 @@ exporters:
        - backend-2:4317
        - backend-3:4317
        - backend-4:4317
+      ## use k8s service resolver, if collector runs in kubernetes environment


This new resolver deserves more information than that. There are other parts of the documentation that needs to be changed, especially line 31.

jpkrohling · 2023-06-23T19:33:46Z

exporter/loadbalancingexporter/resolver_k8s_test.go

+		return true
+	}, time.Second, 20*time.Millisecond)
+
+	// step-3 delete, simulate deletion of backends


I'd prefer to have this on its own test.

Sorry, I didn't get your point here, you mean a separate test method for the delete operation?

Sorry, I meant that the step 3 should be on its own test function: instead of having one test doing everything, have smaller tests exercising smaller units of your code.

fyuan1316 · 2023-06-26T03:43:26Z

@jpkrohling
Thank you very much for your guidance! 😄
I've just rebase the code. Please help revisit it.
I haven't come up with a better way to adjust the output for user-specific error messages. Do you have any good suggestion?

jpkrohling

This is looking good, I had just a couple more comments.

jpkrohling · 2023-06-27T12:54:55Z

exporter/loadbalancingexporter/README.md

@@ -28,13 +28,16 @@ This also supports service name based exporting for traces. If you have two or m
 Refer to [config.yaml](./testdata/config.yaml) for detailed examples on using the processor.

 * The `otlp` property configures the template used for building the OTLP exporter. Refer to the OTLP Exporter documentation for information on which options are available. Note that the `endpoint` property should not be set and will be overridden by this exporter with the backend endpoint.
-* The `resolver` accepts either a `static` node, or a `dns`. If both are specified, `dns` takes precedence.
+* The `resolver` accepts a `static` node, a `dns` or a `k8s` node. If all three are specified, `k8s` takes precedence.


Suggested change

* The `resolver` accepts a `static` node, a `dns` or a `k8s` node. If all three are specified, `k8s` takes precedence.

* The `resolver` accepts a `static` node, a `dns` or a `k8s` service. If all three are specified, `k8s` takes precedence.

jpkrohling · 2023-06-27T12:56:26Z

exporter/loadbalancingexporter/README.md

 * The `hostname` property inside a `dns` node specifies the hostname to query in order to obtain the list of IP addresses.
 * The `dns` node also accepts the following optional properties:
  * `hostname` DNS hostname to resolve.
  * `port` port to be used for exporting the traces to the IP addresses resolved from `hostname`. If `port` is not specified, the default port 4317 is used.
  * `interval` resolver interval in go-Duration format, e.g. `5s`, `1d`, `30m`. If not specified, `5s` will be used.
  * `timeout` resolver timeout in go-Duration format, e.g. `5s`, `1d`, `30m`. If not specified, `1s` will be used.
+* The `k8s` node accepts the following optional properties:
+  * `service` Kubernetes service to resolve, e.g. `lb-svc.lb-ns`. If no namespace is specified, an attempt will be made to infer the namespace for this collector, and if this fails it will fall back to the `default` namespace.
+  * `ports` port to be used for exporting the traces to the addresses resolved from `service`. If `ports` is not specified, the default port 4317 is used.


Suggested change

* `ports` port to be used for exporting the traces to the addresses resolved from `service`. If `ports` is not specified, the default port 4317 is used.

* `ports` port to be used for exporting the traces to the addresses resolved from `service`. If `ports` is not specified, the default port 4317 is used. When multiple ports are specified, two backends are added to the load balancer as if they were at different pods.

jpkrohling · 2023-06-27T12:56:38Z

exporter/loadbalancingexporter/README.md

@@ -83,6 +86,49 @@ service:
        - loadbalancing
 ```

+K8s resolver example


Suggested change

K8s resolver example

Kubernetes resolver example

jpkrohling · 2023-06-27T12:58:32Z

exporter/loadbalancingexporter/resolver_k8s.go

+
+var (
+	errNoSvc                        = errors.New("no service specified to resolve the backends")
+	k8sResolverMutator              = tag.Upsert(tag.MustNewKey("resolver"), "k8s service")


I would use k8s here, as the other ones use the config key as the resolver name.

Suggested change

k8sResolverMutator = tag.Upsert(tag.MustNewKey("resolver"), "k8s service")

k8sResolverMutator = tag.Upsert(tag.MustNewKey("resolver"), "k8s")

jpkrohling · 2023-06-27T13:00:13Z

exporter/loadbalancingexporter/resolver_k8s.go

+	if len(nAddr) > 1 {
+		namespace = nAddr[1]
+	} else {
+		logger.Info("no namespace was provided, introspection firstly")


Suggested change

logger.Info("no namespace was provided, introspection firstly")

logger.Info("the namespace for the Kubernetes service wasn't provided, trying to determine the current namespace", zap.String("name", name))

exporter/loadbalancingexporter/resolver_k8s.go

jpkrohling · 2023-06-27T13:34:48Z

exporter/loadbalancingexporter/resolver_k8s_handler.go

+	case *corev1.Endpoints:
+		endpoints = convertToEndpoints(object)
+	default: // unsupported
+		h.logger.Warn("onAdd unable to handle object", zap.Any("obj", obj))


It would be best to record the object's type, rather than the object itself.

The message could also be more user-focused: Got an unexpected Kubernetes data type during the inclusion of a new pods for the service (and add the service).

Thanks, that's much better, will adjust accordingly.

jpkrohling · 2023-06-27T13:41:33Z

exporter/loadbalancingexporter/resolver_k8s_handler.go

+			h.callback(context.Background())
+		}
+	default: // unsupported
+		h.logger.Warn("onUpdate unable to handle object", zap.Any("obj", oldObj))


Suggested change

h.logger.Warn("onUpdate unable to handle object", zap.Any("obj", oldObj))

h.logger.Warn("Got an unexpected Kubernetes data type during the update of the pods for a service", zap.Any("obj", oldObj))

Thanks a lot, this makes the meaning very clear.

jpkrohling · 2023-06-27T13:43:08Z

exporter/loadbalancingexporter/resolver_k8s_handler.go

+			endpoints = convertToEndpoints(object)
+		}
+	default: // unsupported
+		h.logger.Warn("onDelete unable to handle object", zap.Any("obj", obj))


Same here: improve the message, perhaps based on the previous suggestions.

jpkrohling · 2023-06-27T13:45:35Z

exporter/loadbalancingexporter/resolver_k8s_test.go

+		return true
+	}, time.Second, 20*time.Millisecond)
+
+	// step-3 delete, simulate deletion of backends


Sorry, I meant that the step 3 should be on its own test function: instead of having one test doing everything, have smaller tests exercising smaller units of your code.

JaredTan95 · 2023-07-06T08:20:12Z

@fyuan1316 hi, after resolving conflicts, I think we can push this PR to get merged. :-P

refs:open-telemetry#22776 Signed-off-by: Jared Tan <jian.tan@daocloud.io>

codeboten

I resolved the go.mod conflicts, @jpkrohling can you resolve the conversations if they've been addressed and give this another reivew

codeboten

Please add a changelog for the enhancement

refs:open-telemetry#22776 Signed-off-by: Jared Tan <jian.tan@daocloud.io>

fyuan1316 · 2023-07-14T03:41:52Z

Looks good, just a few small things that shouldn't block this PR. If you prefer to complete the pending items on a follow-up PR, that's fine by me, but please let me know the issue number tracking those items.

I tested this with the following config:

apiVersion: v1
kind: Namespace
metadata:
  name: observability
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: loadbalancer-role
rules:
- apiGroups:
  - ""
  resources:
  - endpoints
  verbs:
  - list
  - watch
  - get
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: loadbalancer
  namespace: observability
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: loadbalancer-rolebinding
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: loadbalancer-role
subjects:
- kind: ServiceAccount
  name: loadbalancer
  namespace: observability
---
apiVersion: opentelemetry.io/v1alpha1
kind: OpenTelemetryCollector
metadata:
  name: loadbalancer
  namespace: observability
spec:
  image: docker.io/jpkroehling/otelcol-with-k8sresolver:latest
  serviceAccount: loadbalancer
  config: |
    receivers:
      otlp:
        protocols:
          grpc:

    processors:

    exporters:
      loadbalancing:
        protocol:
          otlp:
            tls:
              insecure: true
        resolver:
          k8s:
            service: backends-collector-headless.observability

    service:
      pipelines:
        traces:
          receivers:
            - otlp
          processors: []
          exporters:
            - loadbalancing
---
apiVersion: opentelemetry.io/v1alpha1
kind: OpenTelemetryCollector
metadata:
  name: backends
  namespace: observability
spec:
  replicas: 5
  config: |
    receivers:
      otlp:
        protocols:
          grpc:

    processors:

    exporters:
      logging:

    service:
      pipelines:
        traces:
          receivers:
            - otlp
          processors: []
          exporters:
            - logging

I think this configuration is short and clear, and it states precisely the minimum requirements to run the k8s service resolver.

Can we put it in the readme as a documentation description?

JaredTan95 · 2023-07-14T04:00:41Z

I think this configuration is short and clear, and it states precisely the minimum requirements to run the k8s service resolver.

Can we put it in the readme as a documentation description?

+1 for me, I used this way to test in my environment before, so I'm in favor of using those CR to describe it (maybe in the next separate PR).

fyuan1316 · 2023-07-17T02:10:55Z

I created a new issue to follow up on document change #24287 .
can we merge this pr. Thanks again for the help!

jpkrohling · 2023-07-17T14:38:15Z

exporter/loadbalancingexporter/resolver_k8s.go

+	// Check whether the namespace file exists.
+	// If not, we are not running in cluster so can't guess the namespace.
+	if _, err := os.Stat(inClusterNamespacePath); os.IsNotExist(err) {
+		return "", fmt.Errorf("not running in-cluster, please specify LeaderElectionNamespace")


LeaderElectionNamespace?

ok, maybe we just need to use namespaces and "LeaderElectionNamespace" has no role in this context.

jpkrohling · 2023-07-17T14:39:39Z

exporter/loadbalancingexporter/resolver_k8s_handler.go

+		endpoints = convertToEndpoints(object)
+	default: // unsupported
+		h.logger.Warn("Got an unexpected Kubernetes data type during the inclusion of a new pods for the service", zap.Any("obj", obj))
+		_ = stats.RecordWithTags(context.Background(), k8sResolverSuccessFalseMutators, mNumResolutions.M(1))


Please, create an issue to track this. Note that the same pattern repeats elsewhere.

fyuan1316 · 2023-07-19T01:47:32Z

Hi @jpkrohling :
Adjustments to LeaderElectionNamespace have been completed.

There are currently two follow-up issues:
#24287 (docs/example)
#24365 (improve metrics of unsupported k8s runtime object for k8s service resolver )

PTAL

jpkrohling · 2023-07-19T19:32:27Z

It looks like the CI is still failing:

diff --git a/exporter/loadbalancingexporter/resolver_k8s_handler.go b/exporter/loadbalancingexporter/resolver_k8s_handler.go
index 61b3603..b83e0f8 100644
--- a/exporter/loadbalancingexporter/resolver_k8s_handler.go
+++ b/exporter/loadbalancingexporter/resolver_k8s_handler.go
@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package loadbalancingexporter
+package loadbalancingexporter // import "github.com/open-telemetry/opentelemetry-collector-contrib/exporter/loadbalancingexporter"
 
 import (
 	"context"
Porto links are out of date, please run "make goporto" and commit the changes in this PR.

fyuan1316 · 2023-07-20T03:04:33Z

Thanks ! @jpkrohling
Running make -j2 golint GROUP=other and make gotest GROUP=exporter locally succeeds.

jpkrohling · 2023-07-20T13:21:02Z

The tests are failing:

--- FAIL: TestNewLoadBalancerInvalidK8sResolver (0.00s)
    loadbalancer_test.go:81: 
        	Error Trace:	/home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/exporter/loadbalancingexporter/loadbalancer_test.go:81
        	Error:      	Not equal: 
        	            	expected: *errors.errorString(&errors.errorString{s:"no service specified to resolve the backends"})
        	            	actual  : clientcmd.errConfigurationInvalid(clientcmd.errConfigurationInvalid{(*clientcmd.errEmptyConfig)(0xc000069cc0)})
        	Test:       	TestNewLoadBalancerInvalidK8sResolver
FAIL
FAIL	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/loadbalancingexporter	0.409s
?   	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/loadbalancingexporter/internal/metadata	[no test files]
FAIL
make[2]: *** [../../Makefile.Common:99: test] Error 1
make[1]: *** [Makefile:176: exporter/loadbalancingexporter] Error 2
make: *** [Makefile:100: gotest] Error 2

fyuan1316 · 2023-07-20T13:51:28Z

The tests are failing:

--- FAIL: TestNewLoadBalancerInvalidK8sResolver (0.00s)
    loadbalancer_test.go:81: 
        	Error Trace:	/home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/exporter/loadbalancingexporter/loadbalancer_test.go:81
        	Error:      	Not equal: 
        	            	expected: *errors.errorString(&errors.errorString{s:"no service specified to resolve the backends"})
        	            	actual  : clientcmd.errConfigurationInvalid(clientcmd.errConfigurationInvalid{(*clientcmd.errEmptyConfig)(0xc000069cc0)})
        	Test:       	TestNewLoadBalancerInvalidK8sResolver
FAIL
FAIL	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/loadbalancingexporter	0.409s
?   	github.com/open-telemetry/opentelemetry-collector-contrib/exporter/loadbalancingexporter/internal/metadata	[no test files]
FAIL
make[2]: *** [../../Makefile.Common:99: test] Error 1
make[1]: *** [Makefile:176: exporter/loadbalancingexporter] Error 2
make: *** [Makefile:100: gotest] Error 2

Sorry, there's still an error. It looks like the difference between local configuration (with kubeconfig configured) and ci not configured, leads to different expected results.

I would prefer a simple solution to this problem as follows:

p, err := newLoadBalancer(exportertest.NewNopCreateSettings(), cfg, nil)
assert.Nil(t, p)

assert.Equal(t, errNoSvc, err)

modified to

p, err := newLoadBalancer(exportertest.NewNopCreateSettings(), cfg, nil)
assert.Nil(t, p)

assert.True(t, errors.Is(err, clientcmd.ErrEmptyConfig) || errors.Is(err, errNoSvc))

What do you think? @jpkrohling

jpkrohling · 2023-07-20T14:59:32Z

I believe there's a assert.ErrorAs that could be used.

fyuan1316 · 2023-07-21T03:16:53Z

I believe there's a assert.ErrorAs that could be used.

Since clientcmd.errConfigurationInvalid was not exported and errNoSvc is not a struct, my attempts at assert.ErrorAs were unsuccessful.
I suggest the following tweak, and have also updated the pr accordingly:

assert.True(t, clientcmd.IsConfigurationInvalid(err) || errors.Is(err, errNoSvc))

fyuan1316 · 2023-07-22T00:52:19Z

My bad, looks like the previous modification got lost. I'll update it later after I test it locally. By the way, I'm curious to know if I can trigger the CI pipeline to execute by myself, for example, is there a label way to do it?

Signed-off-by: Yuan Fang <yuanfang@alauda.io>

fyuan1316 · 2023-07-22T01:28:15Z

Tested locally and passed, hopefully this time it will work.

make -j2 golint GROUP=other
make -j2 goporto
make gotest-with-cover GROUP=other
make gotest GROUP=other

jpkrohling · 2023-07-22T01:48:17Z

I'm curious to know if I can trigger the CI pipeline to execute by myself, for example, is there a label way to do it?

It only requires approval for the first contribution. Once this is merged, your next contributions won't require an approval to be executed.

fyuan1316 · 2023-07-22T02:37:43Z

I'm curious to know if I can trigger the CI pipeline to execute by myself, for example, is there a label way to do it?

It only requires approval for the first contribution. Once this is merged, your next contributions won't require an approval to be executed.

Got it, thanks.
I noticed that there are 2 non-required check fails, not sure if they are pr related or not, does this affect merge?

fyuan1316 · 2023-07-25T05:20:28Z

@jpkrohling Please take a look. Is it possible to merge now?

fyuan1316 requested review from a team and jpkrohling as code owners May 25, 2023 10:29

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Support a DNSSRVNOA Option on the loadbalancing Exporter #18412

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add k8s svc resolver for loadbalancer

8d872fe

refs:open-telemetry#22776 Signed-off-by: Jared Tan <jian.tan@daocloud.io>

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[exporter/loadbalancer] add k8s svc resolver for loadbalancer openinsight-proj/opentelemetry-collector-contrib#15

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add k8s svc resolver for loadbalancer (#15)

2d9a1b8

refs:open-telemetry#22776 Signed-off-by: Jared Tan <jian.tan@daocloud.io>

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[exporter/loadbalancingexporter] improve docs for k8s service resolver #24287

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[exporter/loadbalancingexporter] improve metrics of unsupported k8s runtime object for k8s service resolver #24365

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[exporter/loadbalancingexporter] support k8s service resolver

d201b41

Signed-off-by: Yuan Fang <yuanfang@alauda.io>

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jpkrohling merged commit be04baa into open-telemetry:main Jul 26, 2023
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	* The `resolver` accepts a `static` node, a `dns` or a `k8s` node. If all three are specified, `k8s` takes precedence.
	* The `resolver` accepts a `static` node, a `dns` or a `k8s` service. If all three are specified, `k8s` takes precedence.

	* `ports` port to be used for exporting the traces to the addresses resolved from `service`. If `ports` is not specified, the default port 4317 is used.
	* `ports` port to be used for exporting the traces to the addresses resolved from `service`. If `ports` is not specified, the default port 4317 is used. When multiple ports are specified, two backends are added to the load balancer as if they were at different pods.

	k8sResolverMutator = tag.Upsert(tag.MustNewKey("resolver"), "k8s service")
	k8sResolverMutator = tag.Upsert(tag.MustNewKey("resolver"), "k8s")

	logger.Info("no namespace was provided, introspection firstly")
	logger.Info("the namespace for the Kubernetes service wasn't provided, trying to determine the current namespace", zap.String("name", name))

	h.logger.Warn("onUpdate unable to handle object", zap.Any("obj", oldObj))
	h.logger.Warn("Got an unexpected Kubernetes data type during the update of the pods for a service", zap.Any("obj", oldObj))

[exporter/loadbalancingexporter] support k8s service resolver #22776

[exporter/loadbalancingexporter] support k8s service resolver #22776

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