chkconfig command HowTo - Linux / Unix Q & A from nixCraft

Set Up a Basic Iptables Firewall on Amazon Linux AMI

last updated October 10, 2019 in Amazon Cloud Computing, CentOS, Iptables, Linux, Security

How do I set up a basic iptables firewall on Amazon Linux AMI running on EC2 or Lightsail instance?

How do I stop Apache from starting on Linux?

last updated May 4, 2020 in Apache, CentOS, Debian / Ubuntu, Linux, RedHat and Friends

How do I stop Apache from starting on Linux?

RHEL / CentOS 6.x KVM Virtualization Installation and Configuration Guide

last updated November 19, 2013 in CentOS, Linux KVM, Package Management, RedHat and Friends, Virtualization

How do I setup and manage a virtualized environment with Kernel based Virtual Machine (KVM) in CentOS or Red Hat Enterpise Linux version 6 server on IBM server? Can you provide step-by-step commands of how to install and manage Virtual Machines (VMs) on a physical server using KVM for RHEL/CentOS version 6.4?

Fedora Linux: Restart / Stop / Start DHCPD Server Command

last updated August 9, 2013 in Commands, Fedora Linux, RedHat and Friends

I am a new Fedora Linux version 18 system administrator. How do I restart dhcpd server using command line options in Fedora Linux server running on HP server hardware?

CentOS / RHEL: Check If A Service Is Running Or Not

last updated December 13, 2013 in CentOS, Monitoring, RedHat and Friends

How do I find out if a service such as MySQL or Apache running on my Centos/RHEL/Fedora Linux server?

CentOS Linux: Start / Stop / Restart SSHD Command

last updated November 27, 2019 in BASH Shell, CentOS, OpenBSD, RedHat and Friends

I am a new CentOS Linux server user. How can I start, stop, or restart the OpenSSH (SSHD) server on a CentOS Linux? How can I start/stop/restart SSHD on boot time on a CentOS Linux 7.x or 8.x? Can you tell me how to start SSHD on boot time on a CentOS Linux?

Linux Configure Firewall Using Shorewall Under RHEL / CentOS

last updated December 20, 2012 in CentOS, Iptables, RedHat and Friends

A properly configured firewall can greatly increase the security of RHEL / CentOS based system. How do I configure a shorewall based firewall for CentOS or Red Hat Enterprise Linux system with an Internet connection? How do I install and configure shorewall to protect the following small business network?