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DRBD
DRBD is the service used for synchronisation of data (usually web and database files) on a cluste...
Explanation
PCS (Pacemaker) Cluster Services: PCS (Pacemaker) Pacemaker provides a framework to manage the...
Pacemaker
Pacemaker provides a framework to manage the availability of resources. It's essentially the core...
Check Stats
watch 'echo "show stat" | nc -U /var/lib/haproxy/stats | cut -d "," -f 1,2,5-11,18,24,27,30,36,50...
Linux Kernel Overview
What is the Linux Kernel? The Linux kernel is the core software that acts as an interface betw...
GRUB - Grand Unified Boot Loader
GRUB's responsibility in the boot process GRUB2 Installation There may come a time where y...
DNS and Hosts Resolution
==================================================================================== DNS and Hos...
Network Managers
==================================================================================== Ubuntu - Ne...
Networking Commands
==================================================================================== Show networ...
Compiling from source
Compiling an application from source essentially means that you are manually creating a package u...
Package Managers
==================================================================================== YUM (Yellow...
Admin Privileges - Sudoers
User & Group Privileges For users to have escalated privilege on a server (root access), they ne...
User/Group/Password Files
==================================================================================== /etc/passwd...
User & Group Management
Adding Users Adding Users To add a user, the useradd command can be used. useradd username...
PCIe
Useful Online Tools
https://ping.pe/
MTA & MDA
Mail Transfer Agent (MTA): This is responsible for sending and receiving emails between different...
QUICK GUIDE: Mail Troubleshooting
xmlrpc & wp-login
==================================================================================== XMLRPC Ide...
RAM
View current RAM configuration lsmem View current RAM usage (human readable) free -h Older sy...