KUBERNETES: How To Check & Edit ConfigMaps In Kube-System Namespace

 KUBERNETES: How To Check & Edit ConfigMaps In Kube-System Namespace

For checking all the config maps in kube-system name space, run below command.

 kubectl get cm -n kube-system

 

 Below is sample output.

 

$ kubectl get cm -n kube-system

NAME                                 DATA   AGE

coredns                              1      24d

extension-apiserver-authentication   6      24d

kube-flannel-cfg                     2      24d

kube-proxy                           2      24d

kube-root-ca.crt                     1      24d

kubeadm-config                       2      24d

kubelet-config                       1      14d

kubelet-config-1.21                  1      24d

kubelet-config-1.22                  1      14d

kubelet-config-1.23                  1      14d

To view configmap for specific configmap name, use below command. Replace kubelet-config-1.21 with name of config map you want to view.

kubectl describe configmaps kubelet-config-1.21 -n kube-system

Below is sample output.

$ kubectl edit cm kubelet-config-1.21 -n kube-system

Edit cancelled, no changes made.

[opc@cne14-control1 ~]$ kubectl describe configmaps kubelet-config-1.21 -n kube-system

Name:         kubelet-config-1.21

Namespace:    kube-system

Labels:       <none>

Annotations:  kubeadm.kubernetes.io/component-config.hash: sha256:8912bdfe80280dffc9e637149eb28ce3727d3d140cb1e7d43174177989e59620

Data

====

kubelet:

----

apiVersion: kubelet.config.k8s.io/v1beta1

authentication:

  anonymous:

    enabled: false

  webhook:

    cacheTTL: 0s

    enabled: true

  x509:

    clientCAFile: /etc/kubernetes/pki/ca.crt

authorization:

  mode: Webhook

  webhook:

    cacheAuthorizedTTL: 0s

    cacheUnauthorizedTTL: 0s

cgroupDriver: systemd

clusterDNS:

- 10.XX.XX.10

clusterDomain: cluster.local

cpuManagerReconcilePeriod: 0s

evictionPressureTransitionPeriod: 0s

fileCheckFrequency: 0s

healthzBindAddress: 127.0.0.1

healthzPort: 10248

httpCheckFrequency: 0s

imageMinimumGCAge: 0s

kind: KubeletConfiguration

logging: {}

nodeStatusReportFrequency: 0s

nodeStatusUpdateFrequency: 0s

rotateCertificates: true

runtimeRequestTimeout: 0s

shutdownGracePeriod: 0s

shutdownGracePeriodCriticalPods: 0s

staticPodPath: /etc/kubernetes/manifests

streamingConnectionIdleTimeout: 0s

syncFrequency: 0s

volumeStatsAggPeriod: 0s

BinaryData

====

Events:  <none>

To Edit configmap run below command.

kubectl edit cm kubelet-config-1.21 -n kube-system