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TOP & ATOP
Logging interval To change ATOP's logging interval edit the below file: vim /usr/share/atop/ato...
IPS (Intrusion Prevention Systems)
Fail2Ban Fail2Ban is a an IPS system that can be configured to monitor basically any serv...
Netfilter & nftables
Netfilter (nftables) is an iptables replacement commonly found on modern Debian systems by default.
firewalld
firewalld at its core is essentially a wrapper for iptables, but it does include some extra featu...
iptables
iptables iptables is a Linux Firewall utility that's used to configure rules on the kernel netfi...
UFW(Uncomplicated Firewall)
UFW is just a wrapper for iptables. UFW Service Check UFW status ufw status Enable UFW ufw...
Clearing Command Line History
There's a few options here, also see the history man page for more info. 1. Remove the command f...
SSH Configuration
What is SSH? SSH, or Secure Shell, is a cryptographic network protocol used for secure communica...
PAM
Pluggable Authentication Modules (PAM) PAM is essentially an authentication system that allows f...
Disk Encryption (LUKS)
On Linux systems, a relatively common practice amongst high-security systems is to use a disk or ...
fstab & cryptab
fstab (File Systems Table) The fstab (file systems table) is a system configuration file (/etc...
Disk Performance
==================================================================================== I/O Schedul...
Partitions and Filesystems
Partitions What is a partition? Partitions allow you to divide a single physical disk into mu...
Bacula Bextract
Bextract 1. Get list of volumes from TechDB To get an idea of what files you'll need, you need ...
Archiving and Compression
==================================================================================== gzip ==...
STORAGE CONCEPTS
This page details the storage concepts for a linux system. FILE BLOCK In a block storage s...
LVM (Logical Volume Manager)
==================================================================================== LVM, or Log...
FHS - Filesystem Hierarchy Standard
==================================================================================== FHS as defi...
FSCK
==================================================================================== FSCK (File ...
SWAP
==================================================================================== What is SWA...