#Linux

GitLab CI can trust private Docker registries with self-signed certs - here's the dind config.

Ubuntu-centric GitLab docs don't work on RHEL 5. Here's how to force it into submission.

Benchmark test reveals rsync outpaces scp by 2-10x on file transfers - practical performance comparison for deployment workflows.

Automate ClamAV virus scanning on Linux with cron and firewall tuning for continuous protection.

Find IPs hammering your web server with a single command: `cut -d ' ' -f 2 | sort | uniq -c | sort -nk 1`

Server hard drive failed - don't forget to back up /etc and apt package lists along with your data.

Server migration complete - sites, apps, and email now live elsewhere. Report issues if you spot them.

Load average 239+ but SSH worked perfectly: Debian + PostgreSQL kept systems responsive even under extreme duress.

Two iptables rules throttle brute-force SSH attacks: three tries, then a three-minute lockout that bots can't bypass.

Use fuser to identify which process owns that unexpected port immediately.

Apache mod_proxy consolidates multiple services on a single port 80, making your dev stack accessible with clean URLs and proper routing.

Block malicious IPs in Linux with iptables - a simple script keeps brute-force attackers from hammering your server.

Bash rsync scripts keep backups and remote MacBook storage in sync via cron - set ssh keys and forget.

A massive postfix queue backup teaches lessons in email management - qshape uncovers hidden bottlenecks before they cripple the server.

Switching from .seam to .html files in Apache-proxied JBoss breaks index pages - a gotcha that directory listings can't solve.