This is a list of procedures that I have done under Red Hat Enterprise Linux 9

A minimal, updated installation of EL 9, takes 2.6 GB as of 2024-07-27

After installing the described stuff, OS takes > 5 GB

• Disable SELINUX
  • Permissive mode is OK, but disabling SElinux can boost performance by 5%
• Setup datetime sync
• Setup nano text editor
• Setup SSH login hardening
• Setup banner for SSH login
• Setup CSF firewall (with iptables instead of firewalld)
  • Features LFD (Login Failure Daemon)
• Setup lighttpd web server
  • Build from sources
  • With unix-sockets for HAProxy (localhost only)
  • With HTTP/2 and gzip/brotli compression
  • With maxminddb, a module for fast ip/location lookups,
• Setup PHP 8
  • with PHP-FPM
  • with unix-sockets for lighttpd (localhost only)
  • with redis session handler
  • with APCu cache
  • with igbinary
• Setup Redis
  • With unix-sockets (localhost only)
• Setup MariaDB 11.x
  • Install mysqltuner.pl
  • Setup a replication server (multi-source)
• Setup HAProxy 3.0.x
  • Build from sources
  • for SSL offloading
  • for micro-cache
  • With unix-sockets for lighttpd
  • As envelope for Basic auth
  • with TLS v1.3 (faster and more secure than 1.2)
  • with QUIC (HTTP/3)
• Setup certbot for getting SSL through Let's Encrypt
• Tweak sysctl configuration
• Tweak server limits
• Setup BEANSTALKD jobqueue
• Setup ReaR (Relax and Recover) for creating bare-metal ISO backups
• Setup rsnapshot for backups
• Setup lsyncd for mirroring (almost real-time)
  • Build from sources the latest lsyncd version