Security
9 commands to check if connected to internet with shell script examples
commands to check if connected to internet using Linux. Validate internet connectivity with examples using shell bash script in Linux. Check port availability.
How to configure port forwarding in VirtualBox for NAT Networking
Configure port forwarding in virtualbox NAT Networking using command line CLI using VboxManage GUI. ssh into virtualbox from windows port forwarding computer
How to properly update kernel in RHEL/CentOS 7/8 Linux
Steps to update kernel properly in production environment with examples. Precautions to be considered before and after you update kernel in RHEL/CentOS 7 and 8
How to check security updates list & perform linux patch management RHEL
Perform Linux patch management in RHEL 6/7/8 Linux in LIVE production environment. Identify vulnerabilities list and security updates list then apply patch
8 ways to prevent brute force SSH attacks in Linux (CentOS/RHEL 7)
Prevent brute force SSH attacks in RHEL CentOS 7 with examples using Fail2ban, account lockout, SSH rate limit using iptables, sshd_config, SHA512 hashing