devops-admin's questions

How to create Kubernetes DNS service without reinitializing the k8s cluster?

I have accidentally deleted the K8S DNS service and now name resolution is not working between pods and services.

Pods are not able to reach other pods through service.

So is there a way to recreate the K8S DNS service without reinitializing the K8S cluster?

I tried the below spec but it's throwing some errors.

---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "CoreDNS"
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: {{.ClusterDNSServer}}
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP
  - name: metrics
    port: 9153
    protocol: TCP

Error message when I tried to deploy this spec

error: error parsing coredns-svc.yaml: error converting YAML to JSON: yaml: invalid map key: map[interface {}]interface {}{".ClusterDNSServer":interface {}(nil)}

So is this spec the right way to recreate the K8S DNS service and if yes what's wrong with the spec?

How to represent/convert below terraform variables to equivalent azure bicep variable/param.

I'm new to bicep coding. Could anyone help over here with this small query?

variable "policy_templates" {
  type = object({
    composition_path     = string
    composition_defaults = any
    inbound = object({
      set_backend            = any
      platform_authorization = any
    })
  })
}

variable "apim_backends" {
  type = object({
    fn_car = map(any)
  })
}

How can we add units to grafana email/slack alerts

hey, how can we add units to grafana alerts metric like 10GB/100MB instead of just long float value (156543906.909)

check this email alert metrics

Metric name                                       Value

test_grafana.1.ik3tyjfv9vg78tjiwwatfxvld          156543906.909

test_prometheus.1.yycb4sn8syr4i90eso9ixzfx4       145992238.545

test_cadvisor.1.rd7leeyt3ycmtjuvlwdmvqcgn         106926824.727

Please help us with this query.