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DRBD

Cluster

DRBD is the service used for synchronisation of data (usually web and database files) on a cluste...

Updated 5 months ago by Daniel

Explanation

Cluster

PCS (Pacemaker) Cluster Services: PCS (Pacemaker) Pacemaker provides a framework to manage the...

Updated 5 months ago by Daniel

Pacemaker

Cluster

Pacemaker provides a framework to manage the availability of resources. It's essentially the core...

Updated 5 months ago by Daniel

Check Stats

LoadBalancers

watch 'echo "show stat" | nc -U /var/lib/haproxy/stats | cut -d "," -f 1,2,5-11,18,24,27,30,36,50...

Updated 5 months ago by Daniel

Linux Kernel Overview

Boot, Kernel, Recovery, and Tunables

What is the Linux Kernel? The Linux kernel is the core software that acts as an interface betw...

Updated 5 months ago by Daniel

GRUB - Grand Unified Boot Loader

Boot, Kernel, Recovery, and Tunables

GRUB's responsibility in the boot process   GRUB2 Installation There may come a time where y...

Updated 5 months ago by Daniel

DNS and Hosts Resolution

System Networking

==================================================================================== DNS and Hos...

Updated 5 months ago by Daniel

Network Managers

System Networking

==================================================================================== Ubuntu - Ne...

Updated 5 months ago by Daniel

Networking Commands

System Networking

==================================================================================== Show networ...

Updated 5 months ago by Daniel

Compiling from source

Software & Service Management

Compiling an application from source essentially means that you are manually creating a package u...

Updated 5 months ago by Daniel

Package Managers

Software & Service Management

==================================================================================== YUM (Yellow...

Updated 5 months ago by Daniel

Admin Privileges - Sudoers

User Management & File Permissions

User & Group Privileges For users to have escalated privilege on a server (root access), they ne...

Updated 5 months ago by Daniel

User/Group/Password Files

User Management & File Permissions

==================================================================================== /etc/passwd...

Updated 5 months ago by Daniel

User & Group Management

User Management & File Permissions

Adding Users Adding Users To add a user, the useradd command can be used. useradd username...

Updated 5 months ago by Daniel

PCIe

Hardware Configuration & Performance

Updated 5 months ago by Daniel

Useful Online Tools

Monitoring

https://ping.pe/

Updated 5 months ago by Daniel

MTA & MDA

Mail

Mail Transfer Agent (MTA): This is responsible for sending and receiving emails between different...

Updated 5 months ago by Daniel

QUICK GUIDE: Mail Troubleshooting

Mail

Updated 5 months ago by Daniel

xmlrpc & wp-login

Monitoring

==================================================================================== XMLRPC Ide...

Updated 5 months ago by Daniel

RAM

Hardware Configuration & Performance

View current RAM configuration lsmem View current RAM usage (human readable) free -h Older sy...

Updated 5 months ago by Daniel