Kubernetes Cheat Sheet – Important kubectl commands
There are so many frameworks for managing Kubernetes Cluster easily. But still majority of the engineers interact with Kubernetes using the command line client – kubectl. I am listing a set of useful...
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How to configure Kubernetes port forward bind to 0.0.0.0 instead of default...
Kubernetes provides us a feature to port forward an application which is running in the internal network through the Kubernetes client host. By default it binds to the 127.0.0.1 and it won’t accept...
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How to connect to multiple Kubernetes clusters using kubectl ?
In real life projects, we work with multiple Kubernetes clusters. Lets say Dev, QA and Prod cluster. Configuring kubectl and connecting it every time with several commands and config files will be...
View ArticleDifference between kubectl create and kubectl apply commands ?
While dealing with Kubernetes client kubectl, we may get confused with a set of questions like. What is the need of these command options if they do similar operations ? Is there any specific use-case...
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How to renew the certificates in a Kubernetes Cluster ?
Kubernetes cluster internally uses a set of certificates for secure communication. Every certificate has an expiry date and it need to be renewed periodically. The Kubernetes will take care of the...
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kubeadm certs – unknown command “certs” for “kubeadm”
Recently in one of the Kubernetes clusters, I have executed the below command to check the expiry date of the internal certificates. kubeadm certs check-expiration On executing the above command, I...
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kubectl error: You must be logged in to the server (Unauthorized) – how to fix
This error occurs when the kubectl client does not have the correct certificates to interact with the Kubernetes API Server. Every certificate has an expiry date. Kubernetes has mechanisms to update...
View ArticleHow to delete a kubernetes pod which is stuck in terminating state ?
Sometimes a Kubernetes pod may get stuck in the terminating state after issuing the delete command. To resolve this issue, we can forcefully delete the pod. The command is given below. kubectl delete...
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How to manually delete a Kubernetes namespace stuck in terminating state ?
Sometimes, after issuing the command to delete the namespace, namespace will remain in Terminating state without getting deleted. It happened to be several times. To delete the namespace stuck in...
View ArticleMalicious Docker Images – New Attack – Best practices to Follow
Recently I have encountered a cyber attack in one of the projects. This attack is mostly happening in container based environments. A Malicious container gets deployed in the docker environment that...
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