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This step‑by‑step guide shows how to upgrade the outdated OpenSSH 7.4p1 and OpenSSL 1.0.2k on a CentOS 7 server by first installing Telnet as a fallback, removing the old packages, installing OpenSSL 1.1.1g, compiling OpenSSH 8.3p1, adjusting the configuration, and finally testing the new SSH service.
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The article outlines a rapid, one‑minute health check for Linux servers using ten common command‑line tools—uptime, dmesg, vmstat, mpstat, pidstat, iostat, free, sar, and top—to quickly reveal CPU, memory, I/O, network saturation and error conditions before deeper analysis.
The article explains how Red Hat's strategic move to replace CentOS Linux with the rolling‑release CentOS Stream has upset the community, outlines the background of RHEL, Fedora and CentOS, and introduces Rocky Linux as a community‑driven alternative for stable server deployments.
Learn how to install, configure, and maintain a private BIND DNS service on CentOS 7, covering server roles, ACLs, forward and reverse zones, zone files, firewall settings, testing with nslookup, and ongoing DNS record management for a secure internal network.
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