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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 | No Comments

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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Franck Pachot

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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Furkan Suv

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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Franck Pachot

PostgreSQL on Linux: what is cached?

By | Postgres | No Comments

By Franck Pachot . In a recent tweet I wanted to highlight the importance of knowing what you measure with pgbench, because looking at “Transactions per second” without knowing if you are in shared buffer cache hits, or filesystem cache hit, or storage cache hit, or physical read… is just meaningless: https://twitter.com/FranckPachot/status/1358761092307169282?s=20 The “scale” with the default pgbench tables stores about 15MB per scale value, mostly in the pgbench_accounts table and indexes. The default select-only…

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Furkan Suv

SUSE Manager installation

By | Operation systems | No Comments

In this Blog I will write the requirements and steps to install SUSE Manager Server. Maybe you heard about SUSE Manager but you could not understand why a SUSE Manager Server (SUMA) can help to manage your server environments easier. How can SUMA help you? Without automated processes, the systems management overhead increases, and this leadS to increased costs. Get a complete hardware and software inventory of your systems. Install Software with few clicks to…

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Franck Pachot

Pressure Stall Information on Autonomous Linux

By | Database Administration & Monitoring | No Comments

By Franck Pachot . The Linux metrics that are usually considered for performance monitoring and troubleshooting have many drawbacks and frequent misinterpretations. The recent kernels provide PSI (Pressure Stall Information) which is not enabled by default in Oracle Linux “unbreakable” kernel. However, the kernel is compiled with it. Here is how to enabled it in a newly create Autonomous Linux instance (the Oracle Cloud Linux ,based on OEL 7.9, with no-downtime patching) Check PSI availability…

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Furkan Suv

How to prepare for the SLES 15 Admin certification.

By | Operation systems | No Comments

My Background Since I started at dbi services sa (before 3 Weeks), I was working and preparing for the SUSE Linux Enterprise 15 certification. I had worked with other Linux distributions like CentOS, Ubuntu and Debian on my old employer. With my basic Linux knowledge I was able to administrate Apache and nginx with virtual hosts, SSL Encryption with Let’s Encrypt, installing and configuring MySQL Database, opening/closing ports for services with firewall-cmd, network configuration and…

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