Category Archives: Computers

Out Of Memory Killer

Posted on February 18, 2021 by Freejack

In Linux, a process is in place called the OOM Killer that kills processes when memory starts getting too low. While this is an interesting idea, it can kill your application before it kills something that might be a lower … Continue reading →

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Kubernetes Delete an etcd Member

Posted on January 19, 2021 by Freejack

On the Kubernetes cluster, one of the etcd members had a falling out and is reporting the data is stale. While troubleshooting, we came up with several ideas including just rebuilding the cluster. It’s not all that hard overall but … Continue reading →

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Kubernetes Ansible Upgrade to 1.19.6

Posted on December 27, 2020 by Freejack

Upgrading Kubernetes Clusters This document provides a guide to upgrading the Kubernetes clusters in the quickest manner. Much of the upgrade process can be done using Ansible Playbooks. There are a few processes that need to be done centrally on … Continue reading →

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Kubernetes Manual Upgrade to 1.19.6

Posted on December 27, 2020 by Freejack

Upgrading Kubernetes Clusters This documentation is intended to provide the manual process for upgrading the server Operating Systems, Kubernetes to 1.19.6, and any additional updates. This provides example output and should help in troubleshooting should the automated processes experience a … Continue reading →

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Kubernetes Preparation Steps for 1.19.6

Posted on December 27, 2020 by Freejack

Upgrading Kubernetes Clusters The purpose of this document is to provide the background information on what is being upgraded, what versions, and the steps required to prepare for the upgrade itself. These steps are only done once. Once all these … Continue reading →

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Kubernetes Upgrade to 1.19.6

Posted on December 27, 2020 by Freejack

Upgrading Kubernetes Clusters The following lists what software and pods will be upgraded during this quarter. Upgrade the Operating System Upgrade Kubernetes Upgrade kudeadm, kubectl, and kubelet RPMs from 1.18.8 to 1.19.6. Upgrade kubernetes-cni RPM from 0.8.6-0 to 0.8.7-0. kube-apiserver … Continue reading →

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Recabling The Cluster

Posted on November 29, 2020 by Freejack

Background, back in the day we had slow network speeds of 10 Megabits per second (10 Mb/s). The specification is UTP Category 3 shortened to Cat3. That’s about half the speed of normal home type WiFi. (We’re not counting dial-up … Continue reading →

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Backing Up A vCenter Appliance

Posted on November 24, 2020 by Freejack

It’s actually built into the 6.5 vCenter Appliance where you can back up the server data. Log in to https://appliance:5480 and under Summary select Backup. Couple of interesting tips as I proceeded though. Backup logs are located in /var/log/vmware/applmgmt as … Continue reading →

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Upgrading VMware vCenter

Posted on November 24, 2020 by Freejack

I’m upgrading my VMware cluster to support VMware 7. Currently I’m running 6.5 on three older Dell R710’s and a Dell R410. I’ve rebuilt the R410 to run Ubuntu and run KVM on it as it’s a different VM management … Continue reading →

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Downloading Large Files

Posted on November 23, 2020 by Freejack

I need to upgrade my VMware cluster from 6.5 to 7.0 U1 in order to continue to be supported by the VMUG organization. It’s something I should do anyway just to keep my VMware chops current plus continue to learn … Continue reading →

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