Category Archives: Computers

Ansible Tags

Posted on March 18, 2021 by Freejack

Overview Simply enough, Ansible Tags let you run specific tasks in a play. If you have a lengthy playbook or are testing tasks within a playbook, you can assign tags to tasks that let you run a specific task vs … Continue reading →

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Ansible Handlers

Posted on March 15, 2021 by Freejack

Overview Ansible Handlers are tasks that are only performed when a calling task has successfully changed something. Updating Docker Say for example you want to try and update docker. There isn’t always an update available but if there is an … Continue reading →

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Configuring Katello 3.15

Posted on February 21, 2021 by Freejack

I’m currently using Spacewalk to manage patches on my servers however it doesn’t support CentOS 8 and I suspect there’ll be more and more issues. Plus my previous job used Satellite and the current one wants me to install Katello … Continue reading →

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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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