Posted on in system_administration
GitOps has already transformed how we think about infrastructure: declarative, auditable, and version-controlled. But as infrastructure-as-code (IaC) adoption grows and systems become more complex, even GitOps can feel overwhelming.
Enter the next wave: AI-powered GitOps. By integrating large language models (LLMs) into our CI/CD pipelines, infrastructure management becomes not …
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When working with Google Cloud Storage (GCS) via gsutil, most file operations
run smoothly. However, occasional cryptic error messages may appear that leave
you scratching your head. One such error is:
Semaphore released too many times MiB] 99% Done
CommandException: 1 files/objects could not be copied/removed.
make: *** [Makefile …Posted on in system_administration
Backing up systems efficiently is crucial for data integrity and space
management. Using hard links with rsync is a common strategy to conserve disk
space. However, macOS can sometimes present challenges with hard links,
especially when dealing with external drives. This article revisits the issue of
hard links not working …
Posted on in system_administration
Kubernetes has become the de facto standard for container orchestration, enabling organizations to deploy, manage, and scale containerized applications efficiently. Originally developed by Google, Kubernetes is now maintained by the Cloud Native Computing Foundation (CNCF) and has a vibrant, growing community. In this comprehensive guide, we will explore the core …
Posted on in system_administration
In the modern software development landscape, DevOps has become a crucial practice for ensuring rapid delivery of high-quality software. However, with the increasing pace of development, ensuring security throughout the DevOps pipeline is more important than ever. This article will cover best practices and tools for implementing a secure DevOps …
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In the world of software development, Continuous Integration (CI) and Continuous Deployment (CD) have become essential practices for delivering high-quality software quickly and efficiently. Jenkins, an open-source automation server, is one of the most popular tools for implementing CI/CD pipelines. This article will guide you through setting up Jenkins …
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This guide is based on practical notes taken while tuning DRBD (Distributed Replicated Block Device) on a Linux system. DRBD is a software-based, shared-nothing, replicated storage solution for mirroring the content of block devices (hard disks, partitions, logical volumes, etc.) between servers. Proper tuning of DRBD can significantly improve performance …
Posted on in system_administration
DRBD, which stands for Distributed Replicated Block Device, is a software-based, shared-nothing, replicated storage solution for mirroring the content of block devices (such as hard disks, partitions, logical volumes, etc.) between servers. It is often used to build high-availability (HA) clusters and is integrated into the Linux kernel, making it …
Posted on in system_administration
To enable RFC 1323 Window Scaling and increase the TCP window size to 1 MB on
FreeBSD, add the following lines to /etc/sysctl.conf and reboot.
net.inet.tcp.rfc1323=1
kern.ipc.maxsockbuf=16777216
net.inet.tcp.sendspace=1048576
net.inet.tcp.recvspace=1048576
You can make these …
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Note: Although this is a continuation of the TCP Performance Tuning article series, it's also valuable as a standalone reference.
This list includes a mix of both well-established and newer algorithms, reflecting the ongoing advancements in TCP congestion control research and deployment. Algorithms like CUBIC and BBR are particularly notable …
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Encountering the "cache has broken packages, exiting" error while using apt or
apt-get in Ubuntu or Debian can be frustrating, but it's often fixable. This
error occurs when the package manager finds inconsistencies in its internal
cache, preventing it from functioning properly.
This guide will delve into various methods to …
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In today's fast-paced digital landscape, website performance is paramount. Users demand speedy loading times, and search engines reward fast-loading websites with higher rankings. As a web server, Nginx is renowned for its performance and scalability, but to further enhance your web application's efficiency, it's vital to utilize techniques like Gzip …
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Effective session management is crucial for web applications to maintain user state and provide a seamless experience. PHP offers several session storage options, and one of the most efficient and scalable choices is Memcached. In this blog post, we'll explore how to use Memcached for PHP session storage, the benefits …
Posted on in System Administration
Quick and dirty OpenSSH configlet here. If you have a set of hosts or devices
that require you to first jump through a bastion host, the following will allow
you to run a single ssh command:
Host *
ProxyCommand ssh -A <bastion_host> nc %h %p
Change the Host * line to best …
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I've been getting the following error from cron.daily in my inbox lately:
/etc/cron.daily/apt:
Cache has broken packages, exiting
That's an annoying email to get everyday. I decided I would apt-get clean and
that would probably fix the problem:
$ sudo apt-get clean
$ sudo apt-get dist-upgrade
Reading package …
