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August 18, 2020

Learn AWS EKS Kubernetes cluster and devops in AWS (Part 1)

Learn AWS EKS Kubernetes cluster and devops in AWS (Part 1) Starting AWS EKS cluster manually in AWS web console

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April 26, 2022

CKS upgrade kubernetes

major minor patch 1 . 24 . 0 Upgrade Master Node procedure drain and cordon (make it unschedulable) node kubeadm kube-apiserver controller-manager scheduler then:

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April 5, 2022

CKS Restrict API server

There is an flag when starting kube-aoiserver called: kube-apiserver --anonymous-auth=true|false The default value for this option is true because some liveness and readiness probes needs it.

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March 15, 2022

Jenkins seed

sudo nerdctl run --name jenkins -p 8080:8080 -v $PWD/initial.xml:/var/jenkins_home/jobs/seed/config.xml -v $PWD/controller-configuration-jobDSL-orig.

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March 7, 2022

CKS serviceaccount

SesrviceAccount (SA) are namespaces SA “default” in every namespace automatically mounted to a pod can be used to talk to Kubernetes API k create sa accessor k run accessor --image=nginx:alpine -o yaml --dry-run=client > accessor.

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February 24, 2022

Kubernetes RBAC

There are namespaced and non namespaced resources in Kubernetes. Role (namespaced) -> RoleBinding ClusterRole (non namespaced) -> ClusterRoleBinding Be extra careful with ClusterRole and ClusterRoleBinding because these are not only assigned to currently existing namespaces but also to namespaces created in future.

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February 22, 2022

Verify binaries

One has to compare the binary version which is currently running at the Kubernetes master and later on find out the PID of kubelet process.

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