Implement auto certificate rotation function for karmada-agent #2596

lonelyCZ · 2022-09-29T08:58:01Z

Signed-off-by: lonelyCZ 531187475@qq.com

What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:
Part of #2282

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmada-agent: introduce auto certificate rotation function
karmadactl: introduce --enable-cert-rotation option to register command

codecov-commenter · 2022-09-29T09:14:23Z

Codecov Report

Merging #2596 (241f722) into master (be0462c) will increase coverage by 1.69%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2596      +/-   ##
==========================================
+ Coverage   27.48%   29.17%   +1.69%     
==========================================
  Files         190      190              
  Lines       19061    19049      -12     
==========================================
+ Hits         5239     5558     +319     
+ Misses      13461    13140     -321     
+ Partials      361      351      -10

Flag	Coverage Δ
unittests	`29.17% <0.00%> (+1.69%)`	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/agent/app/options/options.go	`0.00% <0.00%> (ø)`
pkg/controllers/context/context.go	`48.57% <ø> (ø)`
pkg/karmadactl/register.go	`0.00% <0.00%> (ø)`
pkg/karmadactl/get.go	`0.00% <0.00%> (ø)`
pkg/karmadactl/logs.go	`0.00% <0.00%> (ø)`
pkg/karmadactl/describe.go	`0.00% <0.00%> (ø)`
pkg/util/serviceaccount.go	`90.27% <0.00%> (+40.27%)`	⬆️
pkg/util/clusterrole.go	`100.00% <0.00%> (+54.16%)`	⬆️
pkg/util/secret.go	`86.66% <0.00%> (+63.45%)`	⬆️
pkg/util/worker.go	`71.42% <0.00%> (+71.42%)`	⬆️
... and 3 more

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pkg/controllers/cert/cert_rotating_controller.go

lonelyCZ · 2022-10-13T16:22:15Z

Deploy karmada-agent in member cluster by below command

./karmadactl register 10.10.103.67:32443 --token tajqle.q025effjnsg9ihsq --discovery-token-ca-cert-hash sha256:28b41535b5c5102f0d4d6ef9478f4d6e9f9ebdb1d47d7735133aee80d21b98eb --karmada-agent-image swr.ap-southeast-1.myhuaweicloud.com/karmada/karmada-agent:v1.3.0-146-g4977115 --cert-expiration-seconds=1800

When the certificate is still valid and not to threshold, it is not rotated.

I1013 12:10:59.563069       1 cert_rotation_controller.go:69] Rotating the certificate of karmada-agent for the member cluster: member68
I1013 12:10:59.584867       1 cert_rotation_controller.go:250] The certificate of karmada-agent: time total=35m0s, remaining=8m28.415150573s, remaining/total=0.24210245265380953
I1013 12:10:59.584963       1 cert_rotation_controller.go:254] The certificate of karmada-agent is valid and has more than 20.00% of its life remaining

When the certificate is about to expire, it will be rotated.

I1013 12:15:59.585793       1 cert_rotation_controller.go:69] Rotating the certificate of karmada-agent for the member cluster: member68
I1013 12:15:59.604375       1 cert_rotation_controller.go:250] The certificate of karmada-agent: time total=35m0s, remaining=3m28.395803201s, remaining/total=0.09923609676238096
I1013 12:15:59.683012       1 cert_rotation_controller.go:196] Waiting for the client certificate to be issued
I1013 12:16:00.703082       1 cert_rotation_controller.go:204] signing certificate successfully
I1013 12:16:00.766080       1 cert_rotation_controller.go:237] The certificate has been rotated successfully, new expiration time is 2022-10-13 12:50:59 +0000 UTC

When the certificate is expired, the current pod will be killed and to be restarted.

I1013 12:50:59.490626       1 cluster_status_controller.go:108] Syncing cluster status: member68
E1013 12:51:00.007468       1 leaderelection.go:330] error retrieving resource lock karmada-system/karmada-agent-member68: Unauthorized
E1013 12:51:02.011907       1 leaderelection.go:330] error retrieving resource lock karmada-system/karmada-agent-member68: Unauthorized
I1013 12:51:03.227447       1 reflector.go:536] k8s.io/client-go/dynamic/dynamicinformer/informer.go:91: Watch close - *unstructured.Unstructured total 6 items received
E1013 12:51:03.229458       1 reflector.go:138] k8s.io/client-go/dynamic/dynamicinformer/informer.go:91: Failed to watch *unstructured.Unstructured: the server has asked for the client to provide credentials
E1013 12:51:04.011004       1 leaderelection.go:330] error retrieving resource lock karmada-system/karmada-agent-member68: Unauthorized
I1013 12:51:04.127390       1 reflector.go:255] Listing and watching *unstructured.Unstructured from k8s.io/client-go/dynamic/dynamicinformer/informer.go:91
W1013 12:51:04.130333       1 reflector.go:324] k8s.io/client-go/dynamic/dynamicinformer/informer.go:91: failed to list *unstructured.Unstructured: Unauthorized
E1013 12:51:04.130384       1 reflector.go:138] k8s.io/client-go/dynamic/dynamicinformer/informer.go:91: Failed to watch *unstructured.Unstructured: failed to list *unstructured.Unstructured: Unauthorized
E1013 12:51:06.011097       1 leaderelection.go:330] error retrieving resource lock karmada-system/karmada-agent-member68: Unauthorized
I1013 12:51:06.777919       1 reflector.go:255] Listing and watching *unstructured.Unstructured from k8s.io/client-go/dynamic/dynamicinformer/informer.go:91
W1013 12:51:06.780190       1 reflector.go:324] k8s.io/client-go/dynamic/dynamicinformer/informer.go:91: failed to list *unstructured.Unstructured: Unauthorized
E1013 12:51:06.780254       1 reflector.go:138] k8s.io/client-go/dynamic/dynamicinformer/informer.go:91: Failed to watch *unstructured.Unstructured: failed to list *unstructured.Unstructured: Unauthorized
E1013 12:51:08.012456       1 leaderelection.go:330] error retrieving resource lock karmada-system/karmada-agent-member68: Unauthorized
E1013 12:51:08.447898       1 controller.go:187] failed to update lease, error: Unauthorized
E1013 12:51:08.450606       1 controller.go:187] failed to update lease, error: Unauthorized
E1013 12:51:08.452548       1 controller.go:187] failed to update lease, error: Unauthorized
E1013 12:51:08.455806       1 controller.go:187] failed to update lease, error: Unauthorized
E1013 12:51:08.458192       1 controller.go:187] failed to update lease, error: Unauthorized
I1013 12:51:08.458345       1 controller.go:114] failed to update lease using latest lease, fallback to ensure lease, err: failed 5 attempts to update lease
E1013 12:51:08.460511       1 controller.go:144] failed to ensure lease exists, will retry in 200ms, error: Unauthorized
E1013 12:51:08.663371       1 controller.go:144] failed to ensure lease exists, will retry in 400ms, error: Unauthorized
E1013 12:51:09.066623       1 controller.go:144] failed to ensure lease exists, will retry in 800ms, error: Unauthorized
I1013 12:51:09.565880       1 cluster_status_controller.go:108] Syncing cluster status: member68
E1013 12:51:09.869421       1 controller.go:144] failed to ensure lease exists, will retry in 1.6s, error: Unauthorized
I1013 12:51:10.005702       1 leaderelection.go:283] failed to renew lease karmada-system/karmada-agent-member68: timed out waiting for the condition
E1013 12:51:10.005872       1 run.go:74] "command failed" err="controller manager exits unexpectedly: leader election lost"

The number of restarts is increased by 1. The valid period of the certificate is generally 1 year, so the number of restarts will not to increase fastly.

[root@master68 lonelyCZ]# kubectl get pod -n karmada-system
NAME                             READY   STATUS    RESTARTS      AGE
karmada-agent-6f8cd7567f-5kdl6   1/1     Running   6 (46m ago)   4h27m

lonelyCZ · 2022-10-13T16:29:31Z

/cc @RainbowMango @prodanlabs @jwcesign

RainbowMango · 2022-10-14T01:21:30Z

/assign
I'll take a look soon. Thanks for your hard work. Take care.

RainbowMango · 2022-10-18T09:09:42Z

Hi @lonelyCZ Would you add an agenda to the community meeting and introduce this feature to us? I'm not familiar with the certificate rotation, it'll need some time for me to go through it.

lonelyCZ · 2022-10-18T09:14:40Z

Hi @lonelyCZ Would you add an agenda to the community meeting and introduce this feature to us? I'm not familiar with the certificate rotation, it'll need some time for me to go through it.

Sure, I will demostrate it at next Tuesday meeting.

lonelyCZ · 2022-10-25T07:42:26Z

I will update a new version today.

lonelyCZ · 2022-10-25T13:22:51Z

I have updated it. PTAL~

/assign @RainbowMango

RainbowMango · 2022-10-26T04:06:42Z

Working on it now.

pkg/karmadactl/register.go

RainbowMango · 2022-10-26T06:57:49Z

cmd/agent/app/agent.go

@@ -205,6 +206,10 @@ func run(ctx context.Context, karmadaConfig karmadactl.KarmadaConfig, opts *opti
 		return err
 	}

+	if opts.EnableCertRotation {


Maybe we don't need the option to control the controller, why don't we take this as a disabled by default controller. How do you think?

It is a good idea.

pkg/controllers/certificate/cert_rotation_controller.go

lonelyCZ · 2022-10-26T11:28:47Z

/cc @RainbowMango

RainbowMango

Generally looks good now.
Just a small touch.

RainbowMango · 2022-10-27T02:01:01Z

pkg/util/secret.go

+	// Fix that resourceVersion should not be set on objects to be created
+	secret.ResourceVersion = ""
+


The first issue I found is the CreateOrUpdateSecret probably does not work as expected, I mean we expect it can fallback to Update once encountering the AlreadyExist error during creating, but since it doesn't take the latest resource version, so the Update would fail again.

For example, the CreateOrUpdate implemented by controller-runtime, it always deep-copy the existing object(take latest resource version) and then make changes(mutate) before try updation.

but since it doesn't take the latest resource version, so the Update would fail again.

It seems not to happen.

but since it doesn't take the latest resource version, so the Update would fail again

Yeah, Update will fail because of old resourceVersion. Caller shall refetch the object and retry.

It seems not to happen.

After client fetch the object, other client update it. Then update will fail.

That's right. I created #2687 for tracking this.

pkg/controllers/certificate/cert_rotation_controller.go

Signed-off-by: lonelyCZ <531187475@qq.com>

lonelyCZ · 2022-10-27T06:15:54Z

/cc @RainbowMango

RainbowMango

/lgtm
/approve

karmada-bot · 2022-10-27T06:19:35Z

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karmada-bot added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. kind/feature Categorizes issue or PR as related to a new feature. labels Sep 29, 2022

karmada-bot requested review from Garrybest and pigletfly September 29, 2022 08:58

karmada-bot added the size/L Denotes a PR that changes 100-499 lines, ignoring generated files. label Sep 29, 2022

lonelyCZ mentioned this pull request Sep 29, 2022

[Umbrella] Develop a new cluster registration method based on TLS/SSL #2282

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lonelyCZ force-pushed the pr-agent-cert-rotation branch 2 times, most recently from 19115dc to 3ec282f Compare October 13, 2022 16:05

lonelyCZ changed the title ~~[WIP]Implement auto certificate rotation function for karmada-agent~~ Implement auto certificate rotation function for karmada-agent Oct 13, 2022

karmada-bot removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Oct 13, 2022

lonelyCZ force-pushed the pr-agent-cert-rotation branch from 3ec282f to b8525d3 Compare October 13, 2022 16:28

karmada-bot requested review from jwcesign, prodanlabs and RainbowMango October 13, 2022 16:29

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REQUEST: New membership for jwcesign karmada-io/community#12

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pkg/controllers/certificate/cert_rotation_controller.go Outdated Show resolved Hide resolved

lonelyCZ force-pushed the pr-agent-cert-rotation branch from e705689 to 6d6bd8a Compare October 26, 2022 09:33

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RainbowMango mentioned this pull request Oct 27, 2022

[ut] add ut for pkg/util/clusterrole, rbac, sercret, secret, serviceaccount #2669

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lonelyCZ added 2 commits October 27, 2022 12:56

Implement the certificate rotation function for karmada-agent

0826fca

Signed-off-by: lonelyCZ <531187475@qq.com>

Introduce --enable-cert-rotation option to karmadactl register command

241f722

Signed-off-by: lonelyCZ <531187475@qq.com>

lonelyCZ force-pushed the pr-agent-cert-rotation branch from 6d6bd8a to 241f722 Compare October 27, 2022 04:57

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karmada-bot merged commit 5d42e82 into karmada-io:master Oct 27, 2022

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RainbowMango mentioned this pull request Oct 27, 2022

CreateOrUpdateSecret function not works as expected #2687

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Implement auto certificate rotation function for karmada-agent #2596

Implement auto certificate rotation function for karmada-agent #2596

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		// Fix that resourceVersion should not be set on objects to be created
		secret.ResourceVersion = ""

Implement auto certificate rotation function for karmada-agent #2596

Implement auto certificate rotation function for karmada-agent #2596

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