Generated apiserver certificate and key. Generate a new apiserver cert via kubeadm -config kubeadmCERT.yaml alpha phase certs kubernetes]# kubeadm -config kubeadmCERT.yaml alpha phase certs apiserver

Navigate back to where your kubeadmCERT.yaml file is located.

If you skipped Step 6., you can just delete the previously mentioned files via rm command like rm apiserver.crt.Make a backup directory and copy these files to it. Backup your old certificates and keys.#NOTE: If the customer is running a load balancer VM then you must add these lines after. Create a file called kubeadmCERT.yaml via vi kubeadmCERT.yaml.Navigate to the Kubernetes directory via cd /etc/kubernetes.Link/ether ee:ee:ee:ee:ee:ee brd ff:ff:ff:ff:ff:ff link-netnsid 4 Link/ether 02:42:d0:29:ce:5e brd ff:ff:ff:ff:ff:ffġ3: mtu 1430 qdisc noqueue state UNKNOWN group default qlen 1000 Valid_lft 37806sec preferred_lft 37806secģ: docker0: mtu 1500 qdisc noqueue state DOWN group default Get its IP address via ip addres kubernetes]# ip address showġ: lo: mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000.New certificates have to be re-issued via Kubeadm across the cluster and then you need to re-join the worker nodes to the masters. You can also find an opensource workflow for Action Orchestrator that will monitor this daily and alert them to issues. You can run this bash script to see the expiration date of their certificates: for crt in /etc/kubernetes/pki/*.crt do If you navigate to the kubectl CLI, you will see this error, 'Unable to connect to the server: x509: certificate has expired or is not yet valid.' Although it will still appear up, you will not be able to log in. You will not be able to access Cisco CloudCentre Suite (CCS). ProblemĪfter one year of time of default installed Kubernetes cluster, the client certificates expire. Furthermore, it goes through the steps needed to fix the situation and get the Kubernetes based system back up and running. This document describes a possible outage issue that the customers might face when they have a Kubernetes based system that has been installed for more than 365 days.

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