Linux
Linux infrastructure notes covering troubleshooting, monitoring, performance, and production operations.
Linux Articles
Technical notes and guides tagged under Linux.
Using tcpdump and Wireshark: Linux and FreeBSD Network Capture and Analysis Guide
Capture network traffic on a headless Linux or FreeBSD server with tcpdump, save it as a pcap file, and review the results locally in Wireshark.
- Linux
- FreeBSD
- Networking
- Troubleshooting
- Security
Understanding NginX’s sendfile Parameter and Its Implications with NFS
In the world of web servers, NginX has emerged as a robust, high-performance option, powering some of the most trafficked sites on the internet. It’s...
- FreeBSD
- Linux
- NFS
- NginX
- Performance
- sendfile
- Web Server
Zabbix Ubuntu: zabbix-agent : Depends: libssl1.1 (>= 1.1.1) but 1.1.0g-2ubuntu4 is to be installed
If you have tried to install the Zabbix agent on an Ubuntu server and hit a libssl dependency error, start by checking repository alignment.
- Linux
- monitoring
- Ubuntu
- Zabbix
What is CPU Steal Time Under Linux, How To Measure it, And How To Keep Your Cloud Provider Honest!
What is CPU Steal Time? In Linux, CPU steal time refers to the amount of time a virtual CPU waits for a real CPU while the hypervisor is servicing another...
- Linux
- monitoring
- Performance
Rocky Linux Makes a Comeback as a CentOS Alternative
Rocky Linux Makes a Comeback as a CentOS Alternative With CentOS 8 upgrades and support set to be discontinued at the end of December 2021, current users...
- Linux
- systems administration
What is Linux? Open Source 101 with A-Team Systems
What is Linux? Open Source 101 with A-Team Systems If you’re new to open source software, you’ve probably wondered “What is Linux?” There’s...
- Linux
- systems administration
- UNIX
FreeBSD vs Linux: Which Open Source OS is Superior?
FreeBSD vs Linux: Which Open Source OS is Superior? FreeBSD vs Linux, which is superior? The answer isn’t so simple. Both have their strengths and...
- FreeBSD
- Linux
- Performance
- systems administration
Dedicated and Cloud Hosting Comparison: AWS, Azure, Google Cloud, Vultr, LiquidWeb
A-Team Systems works with dozens of different hosting providers in almost every environment conceivable. In a unique way this broad experience has given...
- AWS
- Azure
- cloud servers
- dedicated servers
- Google Cloud
- Linux
- LiquidWeb
- Performance
- Vultr
PHP-FPM Chroot “security library: invalid algorithm”
After an OS update on one of our client servers we witnessed a perplexing error in their chrooted PHP-FPM environment: security library: invalid algorithm...
- chroot
- Linux
- PHP
- PHP-FPM
SOLVED: Can’t Connect to Linux Server Behind NAT From Linux/FreeBSD But Can From Windows
Strange networking behavior while trying to access a Linux server via NAT? Does it work from one computer but not another? We may have the solution! We...
- Linux
- NAT
- networking
- sysctl
- TCP
- Windows