🐛 Fix random instance port deletion #1753

zioc · 2023-11-22T10:03:40Z

What this PR does / why we need it:

Under certain circumstances, when they are non-responsive cells, nova may return a partial result instead of an error.

(this is controlled by list_records_by_skipping_down_cells parameter that is true by default - no error will be thrown)

When it faces this issue, capo controller will try to create a new server for the machine, resulting in deleting ports of existing one.

In order avoid this issue, use GET instead of LIST to retrieve server using its uuid. For that purpose we must ensure that uuid is stored in machine spec as soon as the server is created, even if server is in error state.

Fixes: #1612

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Yes

TODOs:

[ X] squashed commits
if necessary:
- includes documentation
- adds unit tests

/hold

linux-foundation-easycla · 2023-11-22T10:03:45Z

The committers listed above are authorized under a signed CLA.

✅ login: zioc / name: Francois Eleouet (75ffe73)

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k8s-ci-robot · 2023-11-22T10:03:50Z

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k8s-ci-robot · 2023-11-22T10:03:51Z

Hi @zioc. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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jichenjc · 2023-11-23T01:25:11Z

/ok-to-test

jichenjc · 2023-11-23T01:25:33Z

@mdbooth maybe need your help on this to see fit for your original idea

zioc · 2023-11-23T16:51:02Z

I revisited to patch to remove the polling as suggested in the issue.

As a consequence, reconcileBastion has to be revisited to requeue until bastion server gets ready. If the approach looks good to you I'll work on adding some tests to controllers.

As instance status check is now moved to the main reconcile loop while the instance is in BUILDING state, its status will only be checked every minute, whereas retryInterval was 10s in CreateInstance polling. I was wondering if it would be acceptable to requeue sooner (in 10s like before for example) while the instance is still in BUILDING state?

mdbooth

This looks great: I'm very much in favour of this!

The e2e test failure looks real, though. Something odd is going on with Bastion creation. It looks like we end up creating bastions continuously until devstack runs out of quota.

To take a look, have a look at the e2e job failure in the PR. At the top you'll see 'Artifacts' which link to everything we dump out of the test run. Some interesting logs:

There's one other factor to consider here from a design POV: we need to handle the case where we fail to write the machine/bastion ID to the status. It turns out it is surprisingly easy for this to happen due to the way we patch objects, but we should also consider that brief outages of the k8s control plane are expected from time to time.

My solution to this to date has been that if the ID is not stored we always check by name, and adopt any resource we find. This solution has its own edge cases, but I think it's a lesser evil.

One more thing, and I mention this only because it looks like you know what you're doing and appreciate clean controllers. Feel free to ignore this entirely if the scope creep is too much:

I would really like to move machine creation out of the cluster controller, but we haven't gotten around to it yet. Instead of calling directly into CreateInstance, I would like to see the cluster controller create a Machine/OpenStackMachine for the Bastion and watch it. That would eliminate a bunch of cruft and duplication, and enable more robustification of the machine cleanup flow.

Again, only if you're up for it. It would make this cleanup simpler, but I'm pretty sure the total work involved would be greater.

mdbooth · 2023-11-27T11:42:13Z

controllers/openstackmachine_controller.go

@@ -379,6 +383,9 @@ func (r *OpenStackMachineReconciler) reconcileNormal(ctx context.Context, scope
 		scope.Logger().Info("Machine instance state is DELETED, no actions")
 		conditions.MarkFalse(openStackMachine, infrav1.InstanceReadyCondition, infrav1.InstanceDeletedReason, clusterv1.ConditionSeverityError, "")
 		return ctrl.Result{}, nil
+	case infrav1.InstanceStateBuilding:
+		scope.Logger().Info("Waiting for instance to become ACTIVE", "id", instanceStatus.ID(), "status", instanceStatus.State())
+		return ctrl.Result{RequeueAfter: waitForBuildingInstanceToReconcile}, nil


Note: I think it's sensible to have a different requeue after here: this is an expected state which under normal circumstances should resolve quickly. The fall-through below is 'random other'. We don't want to poll at 10 second intervals for a server that's shutoff.

zioc · 2023-11-29T14:37:14Z

Thanks a lot for the feedback and suggestions @mdbooth , as well as tips to understand e2e failures, they were very helpful.

It is indeed much safer to try to get instance by name when there is no ID saved in resource, I've added that fallback in various places.

While reworking the reconcileBastion method to fix the observed issue, I figured out that current implementation is not really reconcilling bastion floating IP as it exits as soon as instance hash has been saved in annotations.

With current implementation, if floating IP fails to be attached to the instance (it can be the case if we provide a cluster network without router), it will be creating floating IPs in loop (similarly to what has been described in this issue.

I tried to revisit that part to make it more robust and save allocated floatingIP in cluster status. The proposed patch is functional in most cases, but there is a race condition that sometimes leads to the creation of two floating IPs. It is very likely to be caused by "the way we patch objects" as you said: when bastion is created, its object is patched before the status subresource as we are adding the bastionHash annotation. Consequently cluster may reconcile without updated status and create a new floatingIP.
Unfortunately, as floatingIPs objects don't have names, we can't check by name as a fallback as we do for Instances (we could use description for that purpose, but it is not very clean...).
Other option would be to patch resources status as soon as we want to store some identifier (like instance IDs or floating IPs), this way we would have less chances to face this kind of race conditions.
Last option (and probably the most reasonable one) will be to avoid revisiting the floating IP attachment part (it probably deserves its own PR to keep this one simple), but I felt it was worth sharing this patch anyway for the shake of discussion.

Regarding your suggestion to use Machine/OpenstackMachine for bastion, it seems very interesting at first glance, but there are several points that remains unclear to me:

I'm not sure if it's very clean to have a machine that does not belong to any controlplane or machine deployment from a capi controller perspective, as it expects to find a corresponding node in kubernetes at some point.
As a large part of the code in reconcile/deleteBastion is handling floatingIP attachment and status update, we would still have to handle that part even if we were using an openstackMachine to control the openstack instance. I'm wondering if we would be sharing that much code at the end (but I may be missing something)

zioc

Finally I couldn't manage to avoid an important refactoring of reconcileBastion part. The race condition I was referring to in my previous message is fixed by checking if bastion already has a floating IP attached. (The race may still occur if floating IP failed to be attached, so we may create 2 floating IP in some cases, but it's already much better than current code that will create as many floating IP as it can if it fails to attach them for some reason).

zioc · 2023-12-01T09:18:34Z

pkg/cloud/services/compute/instance_types.go

@@ -116,7 +116,6 @@ func (is *InstanceStatus) BastionStatus(openStackCluster *infrav1.OpenStackClust

 	clusterNetwork := openStackCluster.Status.Network.Name
 	i.IP = ns.IP(clusterNetwork)
-	i.FloatingIP = ns.FloatingIP(clusterNetwork)


Here we were persisting the floating IP in status only if it was attached to the bastion VM. In order to properly track the created floating IP, it is now saved independently in reconcileBastion

zioc · 2023-12-01T09:19:39Z

api/v1alpha5/types.go

-	// InstanceStateBuilding is the string representing an instance in a building state.
-	InstanceStateBuilding = InstanceState("BUILDING")
+	// InstanceStateBuild is the string representing an instance in a build state.
+	InstanceStateBuild = InstanceState("BUILD")


While it is being created Nova server status is BUILD and not BUILDING. As this variable was not used elsewhere I felt it was ok to change it, please let me know it you foresee any issue to do that.

not sure whether there are some consistent
https://github.com/openstack/nova/blob/master/nova/objects/fields.py#L969
seems indicate it's BUILDING

but in the CLI it's BUILD
which makes me a little bit confused, maybe something updated in the nova client?

| ddd0059f-f71e-4b07-9b28-f7344496a713 | amphora-ed18d7f4-e0b8-4f30-98fa-889f4aa0771a | BUILD | spawning | NOSTATE | |

VM state seems to be derived from status, and the correspondance is not staightforward, for BUILDING state, we have a BUILD status

jichenjc · 2023-12-01T09:56:01Z

api/v1alpha5/types.go

-	// InstanceStateBuilding is the string representing an instance in a building state.
-	InstanceStateBuilding = InstanceState("BUILDING")
+	// InstanceStateBuild is the string representing an instance in a build state.
+	InstanceStateBuild = InstanceState("BUILD")


not sure whether there are some consistent
https://github.com/openstack/nova/blob/master/nova/objects/fields.py#L969
seems indicate it's BUILDING

but in the CLI it's BUILD
which makes me a little bit confused, maybe something updated in the nova client?

| ddd0059f-f71e-4b07-9b28-f7344496a713 | amphora-ed18d7f4-e0b8-4f30-98fa-889f4aa0771a | BUILD | spawning | NOSTATE | |

jichenjc · 2023-12-01T09:57:02Z

controllers/openstackcluster_controller.go

-	if err != nil {
-		return err
+	if openStackCluster.Status.Bastion != nil && openStackCluster.Status.Bastion.FloatingIP != "" {
+		// Floating IP could have been created but not associated to instance, attempt to delete it from saved status first


I would add some log here as it's useful info

Actually this is the regular case (floating IP is stored in status, and deleted here), I haven't removed the other block that removes floating IP attached to bastion, but it will we be useful only if floating IP is was not properly saved in status for some reason. Maybe I should reword the comment to make it clearer.

As the removal of floating IP will already be logged when it will be removed at this point, it does not seem very meaningfull to add another log. I changed my comment, hoping that it will be more explicit. Let me know if you want me to revisit that.

k8s-ci-robot · 2024-01-08T16:42:34Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mdbooth, zioc

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EmilienM · 2024-01-08T20:10:45Z

/test pull-cluster-api-provider-openstack-e2e-full-test

zioc · 2024-01-10T12:16:55Z

/approve

This looks great, and especially thanks for writing good tests with good descriptions.

I've approved, but I'd appreciated it if you could clear up the portID thing in the tests. It works, but it raised a flag for me that detracted from the clarity of the tests.

Thanks for the review @mdbooth I've updated the tests following your suggestion, and rebased on top of latest changes as there were merge conflicts.

@jichenjc could you please have a look too? It'd be really great to get rid of this issue!

EmilienM · 2024-01-10T15:28:56Z

/test pull-cluster-api-provider-openstack-e2e-full-test

jichenjc · 2024-01-11T06:53:56Z

@zioc can you help address above comments and solve teh conflict ? Thanks

Under certain circumstances, when they are non-responsive cells, nova may return a partial result instead of an error. (this is controlled by list_records_by_skipping_down_cells parameter that is true by default - no error will be thrown) When it faces this issue, capo controller will try to create a new server for the machine, resulting in deleting ports of existing one. In order avoid this issue, use GET instead of LIST with server uuid stored in machine spec when it is created, and store server ID in machine spec immediately. For that purpose server status polling that used to take place in CreateMachine has to be moved to main reconcile loop. ReconcileBastion also needed to be revisited to properly support requeuing.

zioc · 2024-01-12T08:50:20Z

@zioc can you help address above comments and solve teh conflict ? Thanks

@jichenjc I've rebased on top of latest change.

The comments have already been addressed, and the proposed PR is in line with the outcome of various discussions to my opinion. However, I didn't feel comfortable clicking on "Resolve conversation" as I wasn't the one who initiated them, should I?

mdbooth · 2024-01-12T09:32:55Z

FWIW, all of my comments are addressed 👍

jichenjc · 2024-01-12T10:09:12Z

/lgtm
/hold cancel

looks good to me ,thanks~

zioc · 2024-01-12T11:13:25Z

thanks!

/retest

lentzi90 · 2024-01-12T12:41:34Z

/test pull-cluster-api-provider-openstack-e2e-test

mnaser · 2024-01-15T16:56:23Z

/cherry-pick release-0.9

mnaser · 2024-01-15T16:57:04Z

/cherry-pick release-0.8

k8s-infra-cherrypick-robot · 2024-01-15T16:57:07Z

@mnaser: #1753 failed to apply on top of branch "release-0.9":

Applying: Use get instead of list to retrieve servers
Using index info to reconstruct a base tree...
A	api/v1alpha8/types.go
M	controllers/openstackcluster_controller.go
M	controllers/openstackcluster_controller_test.go
M	controllers/openstackmachine_controller.go
M	controllers/suite_test.go
M	pkg/cloud/services/compute/instance.go
M	pkg/cloud/services/compute/instance_test.go
M	pkg/cloud/services/compute/instance_types.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/cloud/services/compute/instance_types.go
Auto-merging pkg/cloud/services/compute/instance_test.go
Auto-merging pkg/cloud/services/compute/instance.go
Auto-merging controllers/suite_test.go
CONFLICT (content): Merge conflict in controllers/suite_test.go
Auto-merging controllers/openstackmachine_controller.go
Auto-merging controllers/openstackcluster_controller_test.go
CONFLICT (content): Merge conflict in controllers/openstackcluster_controller_test.go
Auto-merging controllers/openstackcluster_controller.go
CONFLICT (modify/delete): api/v1alpha8/types.go deleted in HEAD and modified in Use get instead of list to retrieve servers. Version Use get instead of list to retrieve servers of api/v1alpha8/types.go left in tree.
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Use get instead of list to retrieve servers
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-0.9

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.

k8s-infra-cherrypick-robot · 2024-01-15T16:57:37Z

@mnaser: #1753 failed to apply on top of branch "release-0.8":

Applying: Use get instead of list to retrieve servers
Using index info to reconstruct a base tree...
M	api/v1alpha7/types.go
A	api/v1alpha8/types.go
M	controllers/openstackcluster_controller.go
M	controllers/openstackcluster_controller_test.go
M	controllers/openstackmachine_controller.go
M	controllers/suite_test.go
M	pkg/cloud/services/compute/instance.go
M	pkg/cloud/services/compute/instance_test.go
M	pkg/cloud/services/compute/instance_types.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/cloud/services/compute/instance_types.go
Auto-merging pkg/cloud/services/compute/instance_test.go
CONFLICT (content): Merge conflict in pkg/cloud/services/compute/instance_test.go
Auto-merging pkg/cloud/services/compute/instance.go
Auto-merging controllers/suite_test.go
CONFLICT (content): Merge conflict in controllers/suite_test.go
Auto-merging controllers/openstackmachine_controller.go
CONFLICT (content): Merge conflict in controllers/openstackmachine_controller.go
Auto-merging controllers/openstackcluster_controller_test.go
CONFLICT (content): Merge conflict in controllers/openstackcluster_controller_test.go
Auto-merging controllers/openstackcluster_controller.go
CONFLICT (content): Merge conflict in controllers/openstackcluster_controller.go
CONFLICT (modify/delete): api/v1alpha8/types.go deleted in HEAD and modified in Use get instead of list to retrieve servers. Version Use get instead of list to retrieve servers of api/v1alpha8/types.go left in tree.
Auto-merging api/v1alpha7/types.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Use get instead of list to retrieve servers
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-0.8

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.

EmilienM · 2024-06-04T19:25:03Z

In this PR, FailedCreateServer error event was removed while it's still being tested:

cluster-api-provider-openstack/test/e2e/suites/e2e/e2e_test.go

Line 616 in a63ce56

    
           return isErrorEventExists(namespace.Name, mdInvalidAZName, "FailedCreateServer", azError, eventList)

I have no idea how our CI didn't catch that 🤷 but for sure I'll take a look.

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zioc force-pushed the get-server-by-id branch from 6376101 to efb7b61 Compare November 23, 2023 16:31

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EmilienM mentioned this pull request Jan 24, 2024

🐛 controllers: do not return a RequeueAfter and an error at the same time #1839

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zioc mentioned this pull request May 15, 2024

Errors returned by GetInstanceStatusByName should be handled in machine controller. #2085

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EmilienM mentioned this pull request Jun 4, 2024

FailedCreateServer error event was removed while it's still being tested #2111

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🐛 Fix random instance port deletion #1753

🐛 Fix random instance port deletion #1753

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🐛 Fix random instance port deletion #1753

🐛 Fix random instance port deletion #1753

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