kubernetes

kubectl config get-contexts

kubectl config use-context my-context-name

k8s control plane components

• system-cluster-critical
• The API server is a component of the Kubernetes control plane that exposes the Kubernetes API. The API server is the front end for the Kubernetes control plane.

k8s node components

• system-node-critical

• kube-proxy maintains network rules on nodes. These network rules allow network communication to your Pods from network sessions inside or outside of your cluster.

• https://kubernetes.io/docs/tasks/administer-cluster/coredns/: CoreDNS is a flexible, extensible DNS server that can serve as the Kubernetes cluster DNS.

• SSH into nodes: https://github.com/luksa/kubectl-plugins/tree/master

kubectl get pods -n kube-system
NAME                       READY   STATUS    RESTARTS   AGE
aws-node-8p858             1/1     Running   0          390d
aws-node-sr8pc             1/1     Running   0          390d
aws-node-vqd55             1/1     Running   1          427d
coredns-66cb55d4f4-c9tws   1/1     Running   0          390d
coredns-66cb55d4f4-p49gt   1/1     Running   0          390d
kube-proxy-7dgck           1/1     Running   0          427d
kube-proxy-b6vr8           1/1     Running   0          390d
kube-proxy-mm72f           1/1     Running   0          390d

SelfLink

selfLink was empty, can't make reference

The SelfLink field in every Kubernetes object contains a URL representing the given object but doesn't offer any new information. At the same time, its creation and maintenance impacts performance. https://www.weave.works/blog/what-you-should-know-about-kubernetes-1-20

https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/

kubectl api-versions
admissionregistration.k8s.io/v1
admissionregistration.k8s.io/v1beta1
apiextensions.k8s.io/v1
apiextensions.k8s.io/v1beta1
apiregistration.k8s.io/v1
apiregistration.k8s.io/v1beta1
apps/v1
authentication.k8s.io/v1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1
authorization.k8s.io/v1beta1
autoscaling/v1
autoscaling/v2beta1
autoscaling/v2beta2
batch/v1
batch/v1beta1
certificates.k8s.io/v1
certificates.k8s.io/v1beta1
coordination.k8s.io/v1
coordination.k8s.io/v1beta1
crd.k8s.amazonaws.com/v1alpha1
discovery.k8s.io/v1
discovery.k8s.io/v1beta1
events.k8s.io/v1
events.k8s.io/v1beta1
extensions/v1beta1
flowcontrol.apiserver.k8s.io/v1beta1
networking.k8s.io/v1
networking.k8s.io/v1beta1
node.k8s.io/v1
node.k8s.io/v1beta1
policy/v1
policy/v1beta1
rbac.authorization.k8s.io/v1
rbac.authorization.k8s.io/v1beta1
scheduling.k8s.io/v1
scheduling.k8s.io/v1beta1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1
vpcresources.k8s.aws/v1alpha1
vpcresources.k8s.aws/v1beta1

Solution: Upgrade v1.21.14-eks-4f4795d to v1.24

Logs

kubectl logs lamatola-etl-57d4f65549-9qwtx --all-containers  --namespace dev