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Daniel Westermann

Migrating a CentOS 7 EC2 instance to Rocky Linux 8

By | Database Administration & Monitoring | No Comments

Some time ago I’ve written about migrating a CentOS 8 machine to Red Hat 8, because CentOS 8 reached end of life last December. We did that for all CentOS 8 installations at that customer and all are running as virtual machines. The very same customer has many EC2 instances running on CentOS 7. Migrating away from CentOS 7 is one of the next tasks to complete, as CentOS 7 will reach end of life…

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Joël Cattin

Automating Linux patching with Ansible – How to keep all your environments consistent ?

By | Ansible, DevOps, Operation systems, Security | No Comments

Your may want to patch your Linux servers on a regular basis (e.g using “yum/dnf update”). As always, it’s obviously recommended to : 1) Patch the TEST systems 2) Check if there is no side effects 3) Wait few days or weeks 4) Patch the PROD systems The problem here is that between step 1 and 4 above, a new version of the packages can be available on the public repository you use. Consequently after…

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Daniel Westermann

Switching from CentOS 8 to Red Hat 8

By | Database Administration & Monitoring | 2 Comments

We have quite a few customers still running on CentOS 8 and you probably already are aware that CentOS 8 will be end of life by the end of this year. This forces a lot of companies to either switch to an alternative or to stick with CentOS stream. For most enterprise workloads CentOS stream is not a solution as it is rolling release, and if you want to keep a Red Hat compatible enterprise…

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Karsten Lenz

Recurring PostgreSQL Installations using RHEL 8 and Clones

By | Database Administration & Monitoring | No Comments

This Blog is a follow up uf one of my older Blogs and my Article at heise.de: Blog at dbi-services.com Article at heise.de For RHEL 8 at its clones like AlmaLinux, CentOS, Oracle Linux and Rocky Linux i have written a shell script to automated recurring setups. This is used for a cloud project using own virtual machines. The script automates the steps i have described at my article at heise.de. The script has an…

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Karsten Lenz

De-Ubuntu Ubuntu

By | Operation systems | No Comments

Canonical is consistently promoting Snap Integration in the Ubuntu world with all its market power. However, many do not like this development with Ubuntu. But what options do you still have as an Ubuntu user if you don’t necessarily want to change the distribution? I’ll show you how to run Ubuntu 20.04 with Flatpak instead of Snap and get rid of the data-collecting packages. Many switch to Linux because dealing with privacy in other operating…

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Karsten Lenz

CentOS 8 binary compatible alternatives

By | Database Administration & Monitoring | No Comments

There is a lot of roumors around since it was anounced to switch CentOS 8 from a Downstream Build from RHEL 8 to a Upstream Build for RHEL 8 on December 8th 2020. Many people asked why a second Upstream to Fedora and the way of communication choosen was sub optimal in diplomatic words. Cutting the support date from 31st of May 2029 to 31st of December 2021 brings many people in trouble which has…

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Joël Cattin

Automating Linux patching with Ansible

By | Ansible, DevOps, Operation systems, Security | One Comment

Since the beginning of the year, several vulnerabilities have been discovered in the Linux Kernel as well as in others important and widely-used packages. Among them, there was the famous CVE-2021-3156 affecting the sudo package and allowing any unprivileged user to gain root privileges. This one had a base score of 7.8, which is considered as high. This kind of events demonstrate the importance of having a strong patching strategy to ensure up-to-date softwares and…

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Open source Team

Linux perf-top basics: understand the %

By | Cloud | No Comments

By Franck Pachot . Linux kernel has a powerful instrumentation that can be accessed easily. When you want to drill down into your program functions to understand their CPU usage, “perf” is the easiest. It can attach to the processes, sample the CPU cycles, get the symbol name, or even the call stack. And display an histogram of sample counts. This provides an easy profiling tool to understand in which function your program spends its…

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Open source Team

SUMA Server Part 2

By | Development & Performance, Operation systems | No Comments

In my previous Blog I wrote how to install and configure SUSE Manager. In this Blog I will go more in the deep like repository management and PXE boot configuration. Configuring repository To syncronize products from SUSE repository, you need configure first the Organization Credentials. To get your username and password for repository you need to go: https://scc.suse.com/ Login with your SUSE Account   Admin -> Setup Wizard -> Organization Credentials -> Add a new…

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