Kubernetes Archives

Posted on August 30, 2023August 30, 2023 by geralexgr — Leave a comment

How to find custom defined values in helm charts

I was trying to validate if a custom value that I overrode on a helm deployment was correct. In order to override a value in values.yaml you will need to pass the set flag as shown below.

helm upgrade --install -n sonarqube sonarqube sonarqube/sonarqube --set persistence.enabled=true

In the above installation command I override the persistence.enabled value to true instead of false that is by default.

First of all you will need to get the release name of the helm chart that you deployed. You can find this information by

helm list --all -n namespace

After finding the name of the release you will need to use the get command in order to get values.

 helm -n sonarqube get values sonarqube -n sonarqube

This option will persist the Elasticsearch indexes in a Persistent Volume, but with regular killing operations by the Kubernetes Cluster, these indexes can be corrupted. By default, persistency is disabled in the Helm chart.

Deploy SonarQube on Kubernetes (sonarsource.com)

Posted on July 17, 2023July 17, 2023 by geralexgr — 2 Comments

error: the namespace from the provided object does not match the namespace. You must pass –namespace to perform this operation

When you need to copy a secret from one namespace to another in a Kubernetes cluster you may face the below error.

error: the namespace from the provided object "" does not match the namespace "". You must pass --namespace to perform this operation

The issue can be found because of the origin namespace that is referenced inside the secret. In order to bypass you can export the secret and change the referenced namespace.

kubectl get secret mysecret --namespace=ns1 -o yaml > export.yaml

In order to get it work you will need to change the namespace according to your new namespace in the export.yaml and apply it.

namespace: ns2

Posted on April 26, 2023April 26, 2023 by geralexgr — Leave a comment

Error from server (Forbidden): nodes is forbidden: User “” cannot list resource “nodes” in API group “” at the cluster scope

kubelogin is a client-go credential (exec) plugin implementing azure authentication. This plugin provides features that are not available in kubectl. It is supported on kubectl v1.11+ and you can bypass interactive authentication with it. This means that you do not have to enter a device code login when interacting with AKS.

I had to use the tool for managed identity authentication with Kubernetes service. In the documentation you can find instructions on how to use it for cases like user login, service principal, managed identity.

https://azure.github.io/kubelogin/concepts/login-modes/msi.html

Although I was following the correct instructions I was struggling with the error shown below when I was executing kubectl commands.

This error was due to the fact that I was not requesting the admin credentials on the kubectl command.

When I was asking for credentials with the below command I ended up with the error.

az aks get-credentials--resource-group rg --name clustername

As I had assigned the Kubernetes admin Cluster role on my managed identity I was able to execute kubectl commands when using.

az aks get-credentials --admin --resource-group rg --name clustername

Posted on March 16, 2023March 16, 2023 by geralexgr — Leave a comment

Install kubernetes plugins with krew

There are a lot of tools built around Kubernetes the industry standard orchestration tool that enterprises use in order to host micro-services. One open source project which allow you to install helpful plugins for k8s is krew and you can find it on GitHub.

By installing krew, you will get access to many helpful plugins that have been created for developers and uploaded to krew marketplace. One example of these plugins is the resource-capacity plugin which gives you at a glance limit, resources usage for your k8s pods.

First you will need to install krew for your operating system. The installation instructions can be found in the link below, and you should follow the steps provided.

https://krew.sigs.k8s.io/docs/user-guide/setup/install/

If you use windows, you will need to add krew on your path in order to have the tool available on your command line. First navigate in your system advanced settings and press environmental variables.