Rovel

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Rovel

Generate your keys

Prereqs

• gpg

Create your keys with your email.

Execute following commands:

Rovel

How to Change Open Files Limit on OS X and macOS

To check the current limits on your Mac OS X system, run in terminal:

launchctl limit maxfiles
ulimit -a

Steps

Rovel

version: '3'

services:
  redis:
    image: redis:5.0.0
    container_name: master
    ports:
      - "6379:6379"
    networks:
      - redis-replication

Rovel

#!/bin/bash

# Ubuntu 24.04 Server Hardening Script

set -euo pipefail
IFS=$'\n\t'

# --- Constants ---
REQUIRED_OS="Ubuntu"
REQUIRED_VERSION="24.04"