After CentOS 7 reached end‑of‑life, this guide evaluates six popular alternatives—Rocky Linux, AlmaLinux, Red Hat Enterprise Linux, openEuler, Kylin V10 and Ubuntu—by outlining their origins, RHEL compatibility, open‑source status, cloud‑native support, and ideal migration scenarios.
This step‑by‑step guide shows how to upgrade the outdated OpenSSH 7.4p1 and OpenSSL 1.0.2k on a CentOS 7 server by first installing Telnet as a fallback, removing the old packages, installing OpenSSL 1.1.1g, compiling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 guide explains virtualization concepts, introduces KVM, and provides step‑by‑step instructions for installing KVM on CentOS 7, configuring networking, setting up libvirt, deploying the webvirtmgr web UI, creating virtual machines, and troubleshooting common issues.
This tutorial walks you through safely upgrading OpenSSH (to 8.3p1) and OpenSSL (to 1.1.1g) on CentOS 7, covering prerequisite OpenSSL upgrade, service shutdown, dependency installation, source compilation, configuration tweaks, and verification steps.
This guide explains how to use ifconfig to view and modify network interfaces, manage them with ifup/ifdown, edit CentOS 7 configuration files, apply additional ip commands, and troubleshoot common VM cloning network issues.
This guide explains how to use ifconfig, ifup, and ifdown to view and modify network interfaces on CentOS7, details the relevant configuration files, provides default NIC settings, lists additional ip commands, and offers troubleshooting tips for virtual machine network issues.
This guide explains how CentOS 7 uses firewalld and iptables, compares their features, describes zone concepts, and provides detailed commands for installing, configuring, and managing iptables rules, including rule syntax, table order, and common firewall policies.
This guide explains the coexistence of firewalld and iptables on CentOS 7, compares their features, details zone concepts, outlines iptables architecture, and provides step‑by‑step commands for installing, configuring, and managing firewall rules, including rule syntax and saving configurations.
This tutorial walks through importing a CentOS7 virtual machine into VMware, configuring static or dynamic IP settings, installing JDK 1.8, setting up MySQL 5.7 with remote access, and deploying Tomcat 8.5 and a Spring Boot service for automatic startup, including common pitfalls and fixes.
This article records a complete, step‑by‑step installation and startup process for Apache RocketMQ on a CentOS 7 system, covering environment checks, downloading the package, extracting files, launching the name server and broker, adjusting memory settings, and verifying the setup with a test client.
This step‑by‑step guide shows how to install and configure a single‑node Hadoop 3.2.0 environment on CentOS 7, set up Python 3.7, write MapReduce mapper and reducer scripts in Python, and run a word‑count job using Hadoop streaming, illustrating core Hadoop concepts and their relevance today.
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 article introduces systemd, explains its advantages over init, details unit concepts and key commands, outlines configuration file structures, and provides three hands‑on examples—managing Nginx, Tomcat, and a custom Java JAR service—demonstrating practical systemd usage on CentOS 7.
This guide walks through installing Node on CentOS 7, using npm to install Node-RED globally, launching the service, and opening the firewall so the editor is reachable at port 1880, including the required unsafe-perm flag for proper permission handling.
This guide walks through installing Docker on CentOS 7, pulling the official Jenkins image, creating a host volume, running the container with proper port and volume mappings, retrieving the initial admin password, and completing the Jenkins setup with recommended plugins.
This guide walks through downloading the Docker 20.10.7 offline package, extracting it on a CentOS 7 host, configuring a systemd service, starting Docker, verifying the installation, and then fully removing Docker and its service files when needed.
This guide walks through installing Docker on CentOS 7, launching Portainer with a single Docker command, accessing its web UI on port 9000, setting an admin password, and using the interface to view and manage images and containers.
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 guide shows how to download, extract, and run the lightweight nmon performance monitoring tool on CentOS 7, including the exact commands to fetch the package, choose the correct binary, start the utility, and view CPU and memory statistics using interactive keys.
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 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.
This guide walks you through checking current disk usage, adding a new disk, creating an LVM partition, extending the volume group and logical volume, resizing the filesystem, and verifying the expansion on a CentOS 7 system to resolve disk‑space shortages.
This step‑by‑step guide shows how to check current disk usage, add a 60 GB disk, create a physical volume, extend the volume group and logical volume, resize the filesystem, and verify the root partition expansion on a CentOS 7 server.
This tutorial walks you through the complete process of manually installing a Kubernetes 1.9.9 master‑worker cluster on CentOS 7, covering environment preparation, binary downloads, configuration of etcd and Kubernetes components, creation of systemd services, and verification of the deployment.
This article walks through disabling firewalld on a CentOS 7 Alibaba Cloud server, installing iptables‑services, adding a complete set of firewall rules, explaining each rule’s purpose, and finally enabling the iptables service to ensure a secure LAMP environment.
This guide walks through installing the LAMP stack (Linux, Apache, MySQL/MariaDB, PHP) on CentOS 7, explains HTTP request processing for static and dynamic resources, and then shows step‑by‑step deployment of WordPress and phpMyAdmin, including common pitfalls and fixes.
This guide walks through setting up a highly available two‑node Nginx service on CentOS 7 using Corosync and Pacemaker, covering topology, environment preparation, host synchronization, HA component installation, NFS sharing, resource configuration with crmsh, and testing the failover behavior.
This hands‑on diary chronicles the author’s experience installing CentOS 7, highlighting differences from earlier RHEL‑based releases such as single‑package selection, XFS default partitions, systemd‑based service management, network interface renaming, and challenges with LVM resizing and DHCP configuration.
