tcpdump is an amazing command-line tool for network sniffing. It is an industry-standard for capturing and analyzing TCP/IP packets. The tcpdump tool can be of great help when resolving networking issues. The packets can be saved to a file and later analyzed. It is a good idea to run this tool occasionally to keep a…
Prometheus is an open-source, metrics-based monitoring system. It collects data from services and hosts by sending HTTP requests on metrics endpoints. It then stores the results in a time-series database and makes it available for analysis and alerting. Why monitor? Enables alerts when things go wrong, preferably before they go wrong. So that somebody can…
As per the Accelerate State of DevOps 2019 report survey, 80% of the respondents said that the primary application or service they supported was hosted on some kind of cloud platform. 50% of the respondents said their primary application was hosted on the public cloud. Why Infrastructure as Code? Traditionally, if we look back when…
DNF is the default package management system on most RPM-based Linux distributions now. DNF downloads packages from repositories installs, uninstall, and updates packages. It performs automatic dependency resolution for packages you are installing, updating, or removing and installs all packages needed to fulfill dependency requirements. On Fedora, it has been the default package manager since…
The default system and service manager for most Linux distributions now is systemd. The systemd process replaces the SysV init. It runs as the first process after the kernel boot and is responsible for bringing the Linux host up to the state where it can be used. It is responsible for starting and managing the…
Configuring, monitoring, and securing networks form an essential part of a Sysadmin’s job. When it comes to managing Linux networks, there are many commands and utilities available. At times networked systems fail. You as an administrator are required to diagnose and resolve issues. Monitoring helps in detecting problems and fixing them before things get out…
Linux offers countless commands and utilities, which help you perform your system administration tasks quickly and efficiently. Your work as system admin includes installing and running software, controlling access, monitoring, ensuring availability, backups, restoring backups, and of course firefighting. 😜 In this article, we review some of the commands frequently used by Linux system administrators…
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