Watch ConfigMaps and Secrets With Spring Cloud Kubernetes Config Watcher From Other Namespaces

[PetricHwang]

My Spring Cloud Kubernetes Configuration Watcher and configmap is different namespace, when I change configmap, then watcher can't listener this configmap change.

• Spring App, Spring Cloud Kubernetes Configuration Watcher and configmap are different namespace, how to reload?

  thank you

[ryanjbaxter]

Can you try setting spring.cloud.kubernetes.client.namespace to the namespace in which the configmap is in? You might also need to set spring.cloud.kubernetes.discovery.all-namespaces=true depending on which notification strategy you are using.

[PetricHwang]

Can you try setting spring.cloud.kubernetes.client.namespace to the namespace in which the configmap is in? You might also need to set spring.cloud.kubernetes.discovery.all-namespaces=true depending on which notification strategy you are using.

Thanks for your reply.

I try setting spring.cloud.kubernetes.client.namespace to the namespace in which the configmap is in and set spring.cloud.kubernetes.discovery.all-namespaces=true , then is ok. But I hope the watcher can listener multiple(one, two...) namespace configmap. Thank you.

[ryanjbaxter]

Yeah that is an enhancement. I will try and work on this, but if anyone else wants to help, you are more than welcome

[kabennett]

If I understand what this enhancement is requested to provide, it's the same thing as described here, correct? If so, is there any update regarding progress on this enhancement? I would love to contribute, but we are expressly forbidden to according to my organization's policy. Thank you.

[ryanjbaxter]

No updates on this yet, sorry.

[walejandromt]

sorry only i want confirm if this update work for Spring Gateway load Mapped multiple Routes with multiples namespaces of Kubernetes services for example spring.cloud.kubernetes.discovery.namespaces=namespaces-app, namespaces-core, namespaces-users

[ryanjbaxter]

@walejandromt that does not have to do with this issue

[cz4rny]

OK, any hints how to make that happen? @ryanjbaxter I could be your programming hands and make that happen. However, I'd appreciate some pointers in which direction. As maybe you know what blocks the multi-namespace usage and I could try to change the code and make a PR.

[ryanjbaxter]

@cz4rny the main change probably needs to be made here https://github.com/spring-cloud/spring-cloud-kubernetes/blob/main/spring-cloud-kubernetes-fabric8-config/src/main/java/org/springframework/cloud/kubernetes/fabric8/config/reload/EventBasedConfigMapChangeDetector.java#L80

In the case where we want to monitor Config Maps across all namespaces we would need to call this.kubernetesClient.configMaps().inAnyNamespace().watch(....

A similar change would need to be made for Secrets.

This should only be enabled when a property is set.

[wind57]

@ryanjbaxter just a minor note, I don't think that EventBasedConfigMapChangeDetector (now it's called Fabric8EventBasedConfigMapChangeDetector in main branch) is the right place, users seem to want that ability via the config watcher.

[ryanjbaxter]

I'm not sure what you mean...

[wind57]

I'll comment may be more when I get my hands on this one, and may be then it will make sense. I am still kind of far from that point, so I'll keep a longer comment for later.

[webrod]

so about this issue, is there a documentation about how 1 instance of the watcher controller can watch configmaps from many other namespaces? The documentation only mentions "spring.cloud.kubernetes.client.namespace", so 1 namespace. https://docs.spring.io/spring-cloud-kubernetes/docs/current/reference/html/index.html#spring-cloud-kubernetes-configuration-watcher

Based on this issue, I tried instead : name: spring.cloud.kubernetes.reload.namespaces value: "namespace1,namespace2"

The log says: o.s.c.k.c.c.KubernetesClientConfigUtils : informer namespaces : [namespace1, namespace2] tesClientEventBasedSecretsChangeDetector : added secret informer for namespace : namespace1 tesClientEventBasedSecretsChangeDetector : added secret informer for namespace : namespace2

but it only adds configmaps from the first namespace in that list, i.e. namespace1. configmaps from namespace2 are ignored

if I set like this: value: "namespace2,namespace1"

then it's the opposite, only configmap from namespace2 are added (and thus monitored).

how to watch configmaps from namespace1 AND namespace2?

thanks for the clarification! Note: I'm using springcloud/spring-cloud-kubernetes-configuration-watcher:3.0.1-SNAPSHOT

[wind57]

if you look at the PR that closed this issue here, the very first file is a documentation change.

Also present here. If anything does not work the way you expect, we need a reproducible example.

[webrod]

I guess I'm confused because I thought property source reload was deprecated as said here: https://docs.spring.io/spring-cloud-kubernetes/docs/3.0.1-SNAPSHOT/reference/html/#propertysource-reload

which redirect to https://docs.spring.io/spring-cloud-kubernetes/docs/3.0.1-SNAPSHOT/reference/html/#spring-cloud-kubernetes-configuration-watcher which does not have any info about watching from many namespaces.

anyways, I understand now that even if deprecated we need to use a 'reload' property like I setup with my watcher controlelr deployment as environment variable; name: spring.cloud.kubernetes.reload.namespaces value: "namespace1,namespace2"

I will continue my investigation, if it still does not work (i.e. only monitoring confimaps from the first namespace in that list) then I will create a new issue

thanks

[wind57]

totally understandable on the confusion part, if something is unclear you can ask here anytime. And while indeed that is deprecated functionality, it still works. I don't know of any plans to actually drop it (but I am not a Spring employee so that this with a grain of salt). As a matter of fact, it was improved in this release.

[PetricHwang]

Sorry, I need to know how to achieve this. Thanks!

[wind57]

@PetricHwang did you read the documentation? https://docs.spring.io/spring-cloud-kubernetes/docs/3.0.1-SNAPSHOT/reference/html/#namespace-label-filtering