This article explains the complete Linux operating system boot sequence using CentOS 6 and CentOS 7 as examples, covering BIOS initialization, GRUB, kernel loading, runlevels, systemd, and final login steps in a clear, step‑by‑step manner.
This guide walks through installing GitLab CE on CentOS 8 via an RPM package, adjusting the gitlab.rb configuration, managing the GitLab service, testing access, and optionally connecting GitLab to an external PostgreSQL database running in Docker.
This tutorial walks you through configuring three CentOS 7.9 nodes, disabling firewalls, setting hostnames, enabling time sync, establishing password‑less SSH, installing required packages, and using Ansible to clone, configure, and deploy a Ceph Nautilus cluster in about ten minutes.
This article provides a comprehensive, step‑by‑step tutorial for setting up a three‑node Ceph storage cluster on CentOS 7.9, covering host configuration, firewall and SELinux settings, package installation, monitor, manager, OSD, MDS, and RGW deployment, along with required keyrings, configuration files, and troubleshooting tips.
This roundup covers Red Hat's defense of ending CentOS, a spam attack on VS Code's GitHub issues, a Windows 10 update that can corrupt SSDs, a Rust usage survey, the C++20 standard release, security incidents, and other notable developments in the tech industry.
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.
This guide walks through downloading and installing Percona XtraBackup on a CentOS server, then demonstrates how to create full backups, remove timestamps, inspect backup contents, and execute incremental backups with detailed command examples and explanations.
With CentOS 8 reaching end‑of‑life and CentOS Stream becoming the sole upstream for RHEL, Oracle Linux emerges as a free, highly compatible RHEL‑based distribution offering long‑term support, a stable kernel, and a viable path for displaced CentOS users.
This guide walks through setting up a CentOS 7 server, creating a non‑root user, installing Python 3, MySQL, and required packages, configuring a Django project, and deploying it with uWSGI behind Nginx for production use.
This guide explains how to configure multiple VLAN‑tagged interfaces on a single Linux network card in CentOS/RHEL, covering kernel module loading, creating VLAN interfaces with ip, assigning IP addresses, and persisting the settings via ifcfg files so they survive reboots.
The article explains Red Hat’s decision to replace traditional CentOS Linux with the rolling‑release CentOS Stream, outlines the impact on stability and support timelines, examines community backlash, and introduces Rocky Linux as a potential community‑driven alternative for enterprise servers.
Red Hat announced the end of the free CentOS Linux distribution, replacing it with the rolling‑release CentOS Stream, and detailed the support timelines for CentOS 7 and 8, urging users to consider RHEL subscriptions, build their own rebuilds, or migrate to alternative platforms.
This tutorial introduces Docker, walks through installing it on CentOS, demonstrates pulling a Java image, creating a Spring Boot project with Docker Maven plugin, building and running the container, and shows how to view container and Log4j2 logs.
This guide walks you through preparing a CentOS 7.4 environment with JDK 1.8, installing Jenkins via yum, configuring Jenkins to communicate with GitHub using webhooks and personal access tokens, and creating a freestyle job that pulls source code, builds, and runs automatically.
This guide explains how to install gdisk on CentOS, create a GPT partition on a new 10 TB data disk, format it, mount it, and set up automatic mounting at boot using the disk's UUID, with step‑by‑step commands and screenshots.
This guide explains how to safely reduce the /home partition size, free up space, and extend the root filesystem on a CentOS 7 server by unmounting /home, locating and terminating lingering processes, resizing the filesystem, installing required tools, and remounting the adjusted partitions.
This article explains how to set up frp, a high-performance reverse-proxy written in Go, to expose internal web and SSH services to the public Internet using domain-based virtual hosts, nginx reverse-proxy, and systemd on CentOS, complete with configuration examples and firewall considerations.
This step‑by‑step guide shows new Linux server users how to configure remote login, switch to fast mirrors, install essential tools like lrzsz and vim, set up environment variables, install Go, and add the vim‑go plugin on a CentOS 8 system.
This guide walks through preparing three CentOS servers—configuring hostnames, disabling firewalls and swap, setting up Docker and Kubernetes repositories, installing Docker and Kubernetes components, adjusting kernel parameters, and finally initializing the Kubernetes master with kubeadm before joining worker nodes.
This guide walks through diagnosing a mis‑partitioned CentOS 7 log server, installing missing tools, safely unmounting and shrinking the /home XFS filesystem, expanding the root volume, and remounting while emphasizing backup and proper command usage.
This tutorial explains how to install Docker on CentOS, pull a Java image, create and configure a Spring Boot project, write a Dockerfile, build the Docker image with Maven, run the container, and view both console and Log4j2 file logs inside the container.
Learn how to install and use Lynis, the open-source Linux security auditing tool, to perform comprehensive system scans, examine groups like kernel and firewalls, interpret reports, and automate vulnerability detection on CentOS 8, empowering administrators to strengthen server defenses.
This tutorial walks through preparing the environment, installing Docker‑CE 18.09.9, configuring prerequisite settings, deploying Kubernetes v1.16.0 master and node components, initializing the cluster, retrieving join commands, and finally installing Flannel networking to achieve a ready‑state cluster on CentOS 7 virtual machines.
This step‑by‑step guide shows how to prepare five CentOS 7.5+ machines, configure hostnames, SSH keys, kernel upgrades, firewall and swap settings, set up Docker and Kubernetes repositories, install Docker, kubeadm, kubelet and kubectl, configure HAProxy + Keepalived for a VIP, initialize a multi‑master cluster, apply the Flannel network plugin, and verify the deployment with an Nginx pod and the Kubernetes dashboard.
Learn how to compile MySQL 8.0 from source on CentOS 7, including installing dependencies, creating users, configuring build options, setting up systemd services, initializing the database, and securing the root account, with complete command examples and configuration file details.
This guide provides Java backend developers with a comprehensive collection of practical Linux commands for CentOS 7.6, covering system service management, file operations, compression, disk and network monitoring, as well as software installation and package management, all illustrated with clear examples and screenshots.
This guide presents a concise collection of practical CentOS 8 Linux commands and regular‑expression patterns, showing how to retrieve IP addresses, disk usage, user information, file permissions, and more, complete with command examples and visual output screenshots.
This comprehensive tutorial walks you through installing a multi-node Kubernetes cluster on CentOS 7.7, covering hardware prerequisites, network setup, Etcd deployment, certificate generation with cfssl, installation of Docker, configuration of master components, worker nodes, CNI networking, CoreDNS, and accessing the Kubernetes dashboard.
This guide walks through setting up a highly available Kubernetes cluster on five CentOS 7 machines using kubeadm, configuring keepalived and HAProxy for load balancing, disabling swap and SELinux, installing Docker, initializing the control plane, joining master and worker nodes, deploying Calico networking, and verifying the cluster’s functionality.
This comprehensive tutorial walks you through preparing three CentOS 7.5 machines, disabling firewalls and swap, installing Docker and Kubernetes components with yum repositories, configuring the master node, joining worker nodes, deploying Flannel networking, setting up the Kubernetes dashboard, and troubleshooting common issues.
This tutorial walks you through installing Zabbix on CentOS 7, covering prerequisite disabling of SELinux and firewalls, adding repositories, installing server, web, and database components, configuring files, securing MariaDB, starting services, and completing the web‑based setup with language customization.
This tutorial walks you through disabling SELinux and the firewall, adding Zabbix and EPEL repositories, installing Zabbix server, web, and database components, configuring files, securing MariaDB, starting services, and completing the web‑based setup to get a fully functional monitoring system.
This guide explains how to use systemctl and journalctl on CentOS 7 to list services that failed to start, check individual service status, interpret error messages, and filter logs for troubleshooting, providing concrete command examples and output analysis.
This guide walks you through installing OpenResty—a high‑performance Nginx/Lua web platform—on CentOS, adding a ready‑made Lua WAF module, configuring its various security rules (IP blacklist/whitelist, CC protection, URL, User‑Agent, GET/POST filters), and troubleshooting common issues.
This article explains MySQL master‑slave replication, covering its concepts, asynchronous replication mechanisms, various synchronization strategies, step‑by‑step installation and configuration on CentOS 7, and includes common interview questions with answers; it also provides practical commands, troubleshooting tips, and performance considerations for read‑write separation in production environments.
This article provides a concise, step‑by‑step tutorial for downloading, compiling, and installing PHP 8.0 Alpha 1 on a CentOS 7 system, configuring essential extensions, setting up PHP‑FPM, verifying the installation, and evaluating the new JIT feature with benchmark results.
This article provides a detailed, Linux‑based tutorial for downloading, configuring, compiling, and installing PHP 8.0 Alpha on CentOS 7, including handling common configure errors, setting up PHP‑FPM, verifying the installation, and testing the new JIT feature with benchmark results.
This article provides a step‑by‑step tutorial on installing VMware Workstation, creating a CentOS 7.8 virtual machine, configuring bridge and NAT networking, adjusting network scripts, installing Java, deploying services, and troubleshooting firewall settings to enable a fully functional test environment.
This article provides a comprehensive, hands‑on tutorial for installing GitLab on a CentOS 7 server and via Docker, covering prerequisite setup, dependency installation, repository configuration, SSL handling, service startup, first‑login procedures, and common troubleshooting tips.
This tutorial walks through preparing three CentOS 7 servers, installing and compiling Redis 6.0.3, configuring master‑slave replication, setting up Sentinel for high availability, adjusting firewall and Redis configuration, and managing the services to achieve a fully functional Redis cluster.
This guide walks through installing Supervisor on CentOS 7, configuring its core settings, creating program definitions for Tomcat and Redis, and managing services with supervisord and supervisorctl, providing a reliable solution for automatic process recovery on Linux/Unix systems.
This article provides a comprehensive, step‑by‑step tutorial for hardening a CentOS 7.7 server, covering complex password creation, password‑policy configuration, PAM strength settings, login‑attempt limits, disabling root SSH access, changing the SSH port, tightening security‑group rules, command‑history limits, log monitoring, and regular data backup procedures.
This guide walks you through installing Supervisor on CentOS 7.6, configuring its core settings, creating process definitions for Tomcat and Redis, and using supervisorctl and systemd to start, stop, and monitor these services, ensuring automatic recovery on failure.
This guide walks you through essential CentOS 7.7 server hardening steps—including setting complex passwords, configuring password policies, enforcing password strength, limiting login attempts, disabling root SSH access, changing SSH ports, tightening firewall rules, managing command history, monitoring logs, and scheduling regular backups—to improve system security.
This guide walks through diagnosing and fixing typical yum command failures on CentOS 7, covering repository 404 errors, package installation failures caused by immutable directories, and missing Python interpreter issues, with concrete commands and step‑by‑step solutions.
This guide walks you through diagnosing and resolving typical yum failures on CentOS 7, covering 404 repository errors, install‑time unpacking failures, and missing Python interpreter issues with clear commands, file checks, and corrective actions.
This guide walks you through diagnosing and resolving typical yum command failures on CentOS 7—including 404 repository errors, package installation failures caused by immutable file attributes, and missing Python interpreter issues—providing step‑by‑step commands, repository configuration tips, and file‑system fixes to restore yum functionality.
This guide walks through preparing three CentOS 7 servers, installing Redis 6.0.3, configuring master‑slave replication, handling common compilation errors, setting up system startup, adjusting firewall and Redis settings, and finally enabling Sentinel for high‑availability monitoring.
This tutorial walks you through setting up a complete Kubernetes development environment on CentOS, covering prerequisite installations, Docker CE setup, kubelet/kubeadm/kubectl configuration, master node initialization, network add‑ons, node joining, and common troubleshooting tips.
A CentOS 8 system may fail to acquire a DHCP address after reboot due to a NetworkManager bug that aborts DHCP activation; by changing the system hostname to localhost as a workaround, the DHCP process succeeds, providing a simple fix until an updated NetworkManager package is available.
This guide walks through manually adding a new Linux user named zhangsan on CentOS 8 by editing /etc/passwd, /etc/shadow, and /etc/group, creating the home directory, setting proper ownership and permissions, creating a mail file, and verifying the account.
This tutorial walks you through installing MySQL 5.7 on two CentOS 7.6 machines, configuring the master and slave my.cnf files, setting up replication users, starting the services, and verifying synchronization with detailed commands and troubleshooting tips.
This guide walks you through the full upgrade of Zabbix to version 5.0.0beta1 on a CentOS 7 system, covering required PHP and database versions, backup procedures, repository setup, package installation, configuration adjustments, and service restart to ensure a smooth transition.
This comprehensive tutorial walks you through installing Java, Elasticsearch, Logstash, Kibana, and related tools on two CentOS 7 servers, configuring cluster settings, verifying health, and visualizing logs with Kibana, complete with command‑line examples and troubleshooting tips.
This guide explains what Nginx is and how reverse proxy works, details its load‑balancing algorithms, provides step‑by‑step commands to download, compile and install Nginx and Tomcat on CentOS 7, shows how to configure Nginx upstreams for Tomcat servers, and lists common pitfalls such as firewall blocks.
This guide walks through preparing a CentOS 7 host, installing Docker, configuring a Zabbix server and MySQL containers, and optionally using docker‑compose to set up Zabbix components, including the web UI and agent, with detailed commands and volume mappings for persistent monitoring.
This guide walks through preparing a CentOS 7.5 environment, installing GNOME and xrdp for remote desktop access, and then downloading, uploading, and executing the QQ for Linux installation script, culminating in launching the client and logging in via QR code.
This guide walks you through configuring software network bridges on RHEL/CentOS 8, covering command‑line setup with nmcli, graphical creation via Cockpit and nm‑connection‑editor, and applying the bridges in Oracle VirtualBox and KVM virtual machines.
When deploying a Spring Boot application on CentOS, MySQL connections may throw CommunicationsException or SSLHandshakeException due to JDK mismatches, socket path errors, SSL settings, timeout defaults, or configuration issues, and this guide explains each cause and provides concrete fixes.
This article walks through the end‑to‑end setup of a small‑scale data platform using Alibaba's Canal for MySQL binlog capture, covering the installation and configuration of MySQL, Zookeeper, Kafka, and Canal itself, and demonstrates real‑time change capture with sample DML operations.
This tutorial walks through building a production‑grade Kubernetes cluster on CentOS by provisioning five virtual machines, configuring networking and DNS, generating TLS certificates with cfssl, installing Docker, setting up a private Harbor registry, and deploying core Kubernetes components such as etcd, kube‑apiserver, controller‑manager, scheduler, kubelet and kube‑proxy with full supervision and health checks.
This tutorial walks you through preparing the environment, configuring cluster components, installing required packages, setting up Python 3.7, running pre‑install checks, executing the GaussDB installation script, handling common errors, and finally uninstalling the cluster on a CentOS 7.5 system.
This tutorial walks through preparing a CentOS 7.5 host, installing required dependencies, creating an nginx user, downloading the source, compiling and installing Nginx 1.11.1, configuring the firewall, and using common Nginx commands to start, test, reload, and enable the service at boot.
This tutorial walks you through setting up a three‑node Hadoop 2.9.2 cluster on CentOS 7.5, covering environment preparation, password‑less SSH, user creation, JDK installation, Hadoop extraction, configuration file edits, directory setup, ownership changes, service startup, and verification via web UIs.
This guide shows how to configure one CentOS machine as a NAT gateway using iptables, enabling nine other LAN servers to access the Internet via SNAT or MASQUERADE, with step‑by‑step commands, kernel settings, and client configuration tips.
This guide walks you through installing and configuring Nextcloud on CentOS 7, covering dependencies, Apache, MariaDB, PHP, Nextcloud deployment, virtual‑host setup, and final login verification, enabling a fully functional private cloud storage service.
This comprehensive tutorial walks you through uninstalling old Docker versions, setting up repositories, installing Docker Engine, and verifying the installation on CentOS, Ubuntu 14.04/16.04, and Windows (including Docker Toolbox for Win7/8 and Docker Desktop for Win10), with all necessary commands and screenshots.
This guide explains IP address basics, special and private ranges, and provides step‑by‑step commands to set up static or dynamic networking on Ubuntu (pre‑ and post‑18.04), CentOS/Red Hat (5‑8), and openSUSE, highlighting the use of NetworkManager and legacy tools.
This step‑by‑step guide explains how to set up a PXE, Kickstart, TFTP, DHCP, and FTP environment on a single CentOS 7 server to perform fully automated, network‑based OS installations for multiple client machines.
This tutorial walks you through preparing the environment, installing VMware Workstation, creating a virtual machine, configuring CPU, memory, network and storage, and finally installing CentOS 8.1, providing clear screenshots and tips for a smooth Linux setup inside a VM.
This guide walks through configuring two CentOS 7.7 hosts for real-time data synchronization using Sersync and Rsync, covering environment preparation, service deployment, configuration file editing, manual testing, daemon startup, and automatic startup via rc.local.
This guide walks through the principles of NFS, installs and configures the NFS server on CentOS 7.7, sets up shared directories, and demonstrates how Linux and Windows clients can mount and use the NFS shares, including script automation for persistent mapping.
This guide walks you through YUM fundamentals, setting up a local CD‑ROM repository, configuring an Aliyun network mirror, and using common YUM commands—including installation, removal, updates, and troubleshooting lock‑file errors—on a CentOS system.
This step‑by‑step guide explains how to add the PostgreSQL Yum repository, install PostgreSQL 12 client and server packages, initialize and start the database service, set the admin password, optionally enable remote access, and install the pgAdmin 4 web interface on CentOS 7 or 8 systems.
This guide walks through installing Zabbix 4.4.0 on CentOS 7, configuring PostgreSQL, adding the TimescaleDB time‑series extension, setting up the Zabbix database, and tuning Linux, Nginx, and PHP so the monitoring platform runs smoothly with high‑performance time‑series storage.
This tutorial walks you through installing VirtualBox, setting up a CentOS Linux virtual machine, and using Xshell to remotely access the system, covering download links, configuration steps, partitioning details, and essential command-line tips.
This guide explains the PXE boot process, its required DHCP and TFTP services, and how to combine PXE with Kickstart to perform unattended, large‑scale CentOS installations, including detailed configuration steps for DHCP, HTTP, TFTP, boot files, and a complete Kickstart script.
This tutorial walks you through preparing a CentOS system, installing Docker CE, configuring Docker mirrors, setting up kubelet, kubeadm and kubectl packages, adjusting cgroup settings, initializing a Kubernetes master node, joining worker nodes, deploying Flannel networking, and troubleshooting common issues, all with exact command examples.
This guide walks through deploying a centralized Rsyslog server on CentOS, configuring SELinux, firewall, rsyslog, Filebeat, Logstash, and Kibana to collect, process, and visualize logs from various network devices, addressing common sysadmin challenges.
This article walks through a real‑world case of an Oracle RAC/ADG deployment on CentOS 7 that suffered severe performance degradation, detailing the root‑cause analysis, OS and listener tuning, patch installation, cache‑reclamation settings, and compatibility fixes to restore stability.
This guide explains how to use the yum command on CentOS to install, verify, list, and remove packages, manage repository configurations, and perform offline downloads, providing practical tips for both beginners and experienced Linux administrators.
This guide walks through diagnosing a busy /home mount, installing missing tools, safely unmounting, resizing the home partition, installing XFS utilities, and finally expanding the root filesystem on a CentOS 7 server.
This guide provides a comprehensive, command‑by‑command procedure for preparing a CentOS system, installing Docker and Kubernetes components, configuring networking and security settings, and deploying both master and worker nodes along with the Kubernetes Dashboard.
This guide details the prerequisites, RPM-based installation, configuration files, and startup procedures for Elasticsearch, Logstash, and Kibana on a CentOS 7 virtual machine, including verification steps to confirm each component is running correctly.
This guide walks through disabling SELinux and the firewall, installing and configuring OpenLDAP server, setting up the phpLDAPadmin web console, adjusting Apache and phpLDAPadmin settings, and testing the LDAP service on a CentOS system.
This guide details the preparation, configuration, and deployment steps for setting up an OpenShift 3.11 cluster on three CentOS 7.6 virtual machines, covering host mapping, SSH key setup, OS updates, image loading, Ansible playbooks, and troubleshooting common issues.
This guide provides a step‑by‑step tutorial for installing Minikube on a CentOS 7 virtual machine, including prerequisite setup, VirtualBox installation, Kubernetes cluster deployment, Dashboard and kubectl configuration, common commands, and troubleshooting tips for developers.
This guide walks through preparing three CentOS 7.6 VMs as combined master‑node hosts, configuring password‑less SSH, updating the OS, installing Ansible, importing required Docker images, setting up the Ansible inventory, deploying the OpenShift 3.11 cluster, creating an admin account, and troubleshooting common issues.
This guide walks through shrinking the /home partition, extending the root filesystem on a CentOS 7 server, handling busy mount issues, installing missing tools like fuser and xfsdump, resizing XFS, and safely remounting the partitions.
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.
An in‑depth performance benchmark compares MySQL on CentOS 6 and CentOS 7 using sysbench with 10 tables of 5 million rows, revealing up to 40% higher QPS on CentOS 7, detailing test setup, results, and key configuration tweaks that dramatically improve throughput.
This tutorial explains why and how to set up a software RAID1 on a CentOS 7 virtual machine using mdadm, covering prerequisites, disk partitioning, RAID creation, configuration, formatting, mounting, and common maintenance commands.
This guide compiles the most useful Linux commands for service control, file handling, compression, disk and network monitoring, and package management on CentOS 7.6, providing clear examples and visual references to help developers and sysadmins work efficiently.
This tutorial walks you through preparing a CentOS 7.4 system, installing MariaDB, setting up Zabbix 3.4.6 with MySQL support, configuring the database and web frontend, and finally starting all services to achieve a fully functional monitoring platform.
This guide walks you through manually assigning an IP address to a CentOS 6.7 virtual machine by editing the network script, enabling boot, disabling the firewall, restarting the network, and verifying connectivity, enabling further tasks like building distributed clusters.
This tutorial walks you through installing essential tools on CentOS, setting up Docker CE, configuring kubelet and kubeadm packages, initializing a Kubernetes master node, joining worker nodes, installing Flannel networking, and troubleshooting common issues, providing all commands and configuration steps needed for a functional cluster.
This guide walks through disabling SELinux and the firewall, installing and configuring OpenLDAP server, setting up the phpLDAPadmin web console, adjusting Apache and phpLDAPadmin settings, and verifying the LDAP service on a CentOS system.
This tutorial walks through adding the Zabbix repository, installing MySQL 5.7, configuring Nginx and PHP, setting up Zabbix server, agent, and web interface, and finally upgrading Zabbix from 4.0 to 4.2 on a CentOS 7 environment.
This step‑by‑step guide shows how to set up two CentOS 7 virtual machines, install and configure rsync, inotify‑tools, and sersync, and combine them with scripts and cron jobs to obtain reliable, real‑time file synchronization and automated backups across the network.
This guide walks through creating a local CentOS Yum repository from an ISO image, backing up the default repo files, mounting the ISO, configuring a local repo, switching to Aliyun or 163 mirrors, setting repository priorities with yum‑plugin‑priorities, and testing package installation to ensure the local source is used first.
