kubernetes – Page 4 – Tarik Billa

Monitor custom kubernetes pod metrics using Prometheus

April 2, 2024 by Tarik

You have to add this three annotation to your pods: prometheus.io/scrape: ‘true’ prometheus.io/path: ‘/data/metrics’ prometheus.io/port: ’80’ How it will work? Look at the kubernetes-pods job of config-map.yaml you are using to configure prometheus, – job_name: ‘kubernetes-pods’ kubernetes_sd_configs: – role: pod relabel_configs: – source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape] action: keep regex: true – source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path] action: replace target_label: __metrics_path__ … Read more

Get environment variable from kubernetes pod?

March 31, 2024 by Tarik

kubectl exec -it <pod_name> — env

Kubernetes Cluster stuck on removing PV/PVC

March 9, 2024 by Tarik

kubectl edit pv (pv name) Find the following in the manifest file finalizers: – kubernetes.io/pv-protection … and delete it. Then exit, and run this command to delete the pv kubectl delete pv (pv name) –grace-period=0 –force

Namespace “stucked” as Terminating, How I removed it

February 22, 2024 by Tarik

Assuming you’ve already tried to force-delete resources like: Pods stuck at terminating status, and your at your wits’ end trying to recover the namespace… You can force-delete the namespace (perhaps leaving dangling resources): ( NAMESPACE=your-rogue-namespace kubectl proxy & kubectl get namespace $NAMESPACE -o json |jq ‘.spec = {“finalizers”:[]}’ >temp.json curl -k -H “Content-Type: application/json” -X … Read more

How can I check what ingress controller I have on my kube and what is the default

January 8, 2024 by Tarik

You can check for pods implementing ingress controllers (actually with ingress in the name) with: kubectl get pods –all-namespaces | grep ingress And services exposing them with: kubectl get service –all-namespaces | grep ingress As @Prafull Ladha says, you won’t have an ingress controller by default. The documentation states that in “environments other than GCE/Google … Read more

Difference between Kubernetes Objects and Resources

January 6, 2024 by Tarik

A representation of a specific group+version+kind is an object. For example, a v1 Pod, or an apps/v1 Deployment. Those definitions can exist in manifest files, or be obtained from the apiserver. A specific URL used to obtain the object is a resource. For example, a list of v1 Pod objects can be obtained from the … Read more

service selector vs deployment selector matchlabels

January 6, 2024 by Tarik

In the Service‘s spec.selector, you can identify which pods to route traffic to only by their labels. On the other hand, in the Deployment‘s spec.selector you have two options to decide on which node the pods will be scheduled on, which are: matchExpressions, matchLabels.

Kubernetes NFS volume mount fail with exit status 32

January 5, 2024 by Tarik

I had the same problem, and I solved it by installing nfs-common in every Kubernetes nodes. apt-get install -y nfs-common My nodes were installed without nfs-common. Kubernetes will ask each node to mount the NFS into a specific directory to be available to the pod. As mount.nfs was not found, the mounting process failed. Good … Read more

helm error when updating: UPGRADE FAILED: The order in patch list

January 5, 2024 by Tarik

I’ve found that the reason of this problem was that I had some envVars duplicated. In my deployment I had: … spec: template: spec: container: env: – name: ENV_VAR_NAME value: “test” – name: ENV_VAR_NAME value: “test” … After removing the duplicated variable: … spec: template: spec: container: env: – name: ENV_VAR_NAME value: “test” … The … Read more

Get total and free disk space using Prometheus

January 3, 2024 by Tarik

According to my Grafana dashboard, the following metrics work nicely for alerting for available space, 100 – ((node_filesystem_avail_bytes{mountpoint=”https://stackoverflow.com/”,fstype!=”rootfs”} * 100) / node_filesystem_size_bytes{mountpoint=”https://stackoverflow.com/”,fstype!=”rootfs”}) The formula gives out the percentage of available space on the pointed disk. Make sure you include the mountpoint and fstype within the metrics.