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This step‑by‑step guide shows how to upgrade the outdated OpenSSH 7.4p1 and OpenSSL 1.0.2k on a CentOS 7 server by first installing Telnet as a fallback, removing the old packages, installing OpenSSL 1.1.1g, compiling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.
This guide walks through installing NFS utilities, creating a shared directory, configuring /etc/exports, starting the NFS service, and setting up client machines with /etc/fstab for automatic mounting on CentOS 7, including verification steps.
This guide walks through CentOS 7 network configuration, covering ifconfig parameters, using ifup/ifdown, essential configuration files, default interface settings, additional ip commands, and troubleshooting tips for virtual machine cloning issues in Linux environments.
This guide explains the differences between firewalld and iptables on CentOS 7, introduces zone management, details iptables packet flow, tables, chains, and provides practical commands for installing, configuring, and managing firewall rules, including examples for SSH and ping traffic.
This article provides a step‑by‑step tutorial on Linux fundamentals, covering the basic concepts of the operating system, how to obtain and install CentOS 7 in a virtual machine, configure networking, perform system installation, use essential command‑line tools, troubleshoot common issues, and apply basic optimizations.
This guide explains how to troubleshoot firewalld command errors, enable VRRP multicast traffic, and fix VIP migration problems in a Keepalived high‑availability setup on CentOS 7, providing step‑by‑step commands, configuration file adjustments, and verification procedures.
This article provides a complete tutorial for installing Java, downloading Elasticsearch 7.6.2, configuring elasticsearch.yml, starting the service, setting up user passwords, and verifying the single‑node deployment on a CentOS 7 server, complete with command examples and screenshots.
This guide explains how to start, stop, restart, enable, and disable the firewalld service on CentOS 7, add or remove ports, list open ports, and perform related queries using firewall‑cmd and ss commands.
This guide walks through installing Jenkins on CentOS 7, covering prerequisite JDK setup, repository configuration, service start‑up, troubleshooting common startup errors, firewall adjustments, and port configuration to get a functional CI/CD server.
This article provides a detailed, step‑by‑step tutorial for installing Kubernetes v1.16.0 on CentOS 7 virtual machines, covering Docker‑CE installation, prerequisite system configuration, master and node setup, flannel network plugin deployment, and includes all necessary command‑line snippets and the full kube‑flannel.yml manifest.