kubebuilder | Kubebuilder - SDK for building Kubernetes APIs using CRDs | REST library
kandi X-RAY | kubebuilder Summary
kandi X-RAY | kubebuilder Summary
Kubebuilder is a framework for building Kubernetes APIs using custom resource definitions (CRDs). Similar to web development frameworks such as Ruby on Rails and SpringBoot, Kubebuilder increases velocity and reduces the complexity managed by developers for rapidly building and publishing Kubernetes APIs in Go. It builds on top of the canonical techniques used to build the core Kubernetes APIs to provide simple abstractions that reduce boilerplate and toil. Note: kubebuilder does not exist as an example to copy-paste, but instead provides powerful libraries and tools to simplify building and publishing Kubernetes APIs from scratch. Kubebuilder is developed on top of the controller-runtime and controller-tools libraries.
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QUESTION
I'm trying to access my ETCD database from a K8s controller, but getting rpc error/EOF when trying to open ETCD client.
My setup:
- ETCD service is deployed in my K8s cluster and included in my Istio service mesh (its DNS record:
my-etcd-cluster.my-etcd-namespace.svc.cluster.local) - I have a custom K8s controller developed with use of Kubebuilder framework and deployed in the same cluster, different namespace, but configured to be a part of the same Istio service mesh
- I'm trying to connect to ETCD database from the controller, using Go client SDK library for ETCD
Here's my affected Go code:
...ANSWER
Answered 2022-Mar-21 at 08:25Turned out to be version mismatch - my ETCD db is v3.5.2 and the clientv3 library that I used was v3.5.0. As seen in ETCD changelog (https://github.com/etcd-io/etcd/blob/main/CHANGELOG/CHANGELOG-3.5.md):
QUESTION
I created a logger with kubebuilder, it is based on zap logger:
ANSWER
Answered 2022-Mar-17 at 18:11Better answer: as suggested by @Oliver Dain, use zap.AtomicLevel. See their answer for details.
Another option is to create a core with a custom LevelEnabler function. You can use zap.LevelEnablerFunc to convert a closure to a zapcore.LevelEnabler.
The relevant docs:
LevelEnabler decides whether a given logging level is enabled when logging a message.
LevelEnablerFunc is a convenient way to implement zapcore.LevelEnabler with an anonymous function.
That function may then return true or false based on some other variable that changes at runtime:
QUESTION
I have been using kubebuilder for writing custom controller, and aware of Get(), Update(), Delete() methods that it provides. But Now I am looking for a method which mimic the behaviour of kubectl rollout restart deployment. If there is no such direct method then I am looking for correct way to mimic the same.
ANSWER
Answered 2022-Feb-10 at 17:01In all cases where you wish to replicate kubectl behavior, the answer is always to increase its verbosity and it'll show you exactly -- sometimes down to the wire payloads -- what it is doing.
For rollout restart, one will find that it just bumps an annotation on the Deployment/StatefulSet/whatever and that causes the outer object to be "different," and triggering a reconciliation run
You can squat on their annotation, or you can make up your own, or you can use a label change -- practically any "meaningless" change will do
QUESTION
I am creating a new Operator with Kubebuilder to deploy a Kubernetes controller to manage a new CRD Custom Resource Definition.
This new CRD (let's say is called MyNewResource), needs to list/create/delete CronJobs.
So in the Controller Go code where the Reconcile(...) method is defined I added a new RBAC comment to allow the reconciliation to work on CronJobs (see here):
ANSWER
Answered 2022-Jan-12 at 09:40You need to create new Role or ClusterRole (depending if you want your permissions to be namespaced or cluster-wide) and bind that to your system:serviceaccount:myrepo-system:myrepo-controller-manager user using RoleBinding/ClusterRoleBinding. I will provide examples for cluster-wide configuration.
ClusterRole:
QUESTION
How do I have to specify the comments like +kubebuilder:printcolumn to add columns to the output of the command kubectl get my-crd.my-group.my-domain.com?
I've a CRD (Custom Resource Definition) with the usual structs for the specs and the status (similar to what's explained in the Kubebuilder tutorial here https://book.kubebuilder.io/cronjob-tutorial/new-api.html#adding-a-new-api).
I've a Status struct like this:
ANSWER
Answered 2022-Jan-08 at 13:07The solution was to add the code to update the resource status in
the reconciler method of the controller - Reconcile(ctx context.Context, req ctrl.Request), like this:
QUESTION
I have written a k8s controller with kubebuilder which reconciles my CustomResource object (MyResource).
During update, controller-runtime gives me an error 'not found' even though my resource exists on the cluster.
...ANSWER
Answered 2021-Dec-27 at 23:55I was able to resolve this issue myself using:
r.Update(ctx, myResource) instead of r.Status().Update(ctx, myResource)
QUESTION
Environment
Kubectl Version
...ANSWER
Answered 2021-Dec-27 at 02:53see kubebuilder issue#2460, use the controller-gen option crd:generateEmbeddedObjectMeta=true will work
QUESTION
ANSWER
Answered 2021-Nov-02 at 20:51After investigating a little more, I found that running logs on the container yielded standard_init_linux.go:228: exec user process caused: exec format error I opened an issue with the GitLab Operator project and they advised that GitLab Operator must be run on x64_86 architecture. The T4g series is AArch64/arm64. I switched to t2.xlarge and was able to bring up the operator.
QUESTION
I have a complex kubernetes customer resource definition. I want to generate a valid custom resource object from the definition and then replace some values with mine. This is for quick testing purposes.
Instead of creating a yaml file from scratch, I'd like to use a tool to automatically generate it. Like what kubebuilder does when creating an API (put sample objects under config/samples).
Question: Is there any existing tool for this purpose?
...ANSWER
Answered 2021-Sep-27 at 10:51Generally, for generating custom Kubernetes objects based on template there are two solutions:
Both of them have a good documentations with examples - you can find them here for Kustomize and here for Helm.
For better understanding what exactly are they used for and what are differences between them I suggest reading this article and this StackOverFlow answer.
QUESTION
I'm creating a custom resource definition (CRD) with an associated controller using kubebuilder. My controller reconcile loop creates a deployment sub-resource and parents it to the custom resource using controllerutil.SetControllerReference(&myResource, deployment, r.Scheme). I've also configured my reconciler so "own" the sub-resource, as follows:
ANSWER
Answered 2021-Aug-02 at 16:42Using @coderanger's hint, I could see that the metadata.ownerReferences weren't being set correctly when running the following command:
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