Posts
All the articles I've posted.
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SSH Agent Forwarding: How It Works
Understand SSH agent forwarding security risks. When it's safe (almost never), and better alternatives like ProxyJump for jump hosts.
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Is Your Linux Server Destroying Its SSD?
Check SSD health, find excessive write patterns, use noatime, move logs to tmpfs to extend lifespan.
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Docker Compose Profiles: Run Only What You Need
Profiles let you conditionally start services in Compose. Perfect for dev vs prod service splits without multiple files.
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journalctl Queries Every Sysadmin Needs
Essential journalctl commands: -u, -f, --since, -p, -k, -b, --no-pager, JSON output. The queries you need on a broken server at 2 AM.
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Why Your SSH Connection Keeps Dropping
Fix SSH timeouts: ServerAliveInterval, ServerAliveCountMax, ClientAliveInterval. Understand NAT, firewalls, and TCP keepalive.
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ss Is the New netstat (And It's Better)
netstat is deprecated. ss is faster, shows more, and does everything netstat did—better.
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Cleaning Up Docker Disk Space the Right Way
docker system prune is useful but risky. Learn what each cleanup command does and how to check disk usage safely.
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Why Your Cron Job Is Failing Silently
PATH is different in cron, stdout is muted, and MAILTO breaks silently. Learn cron traps and how to debug them.
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SSH Multiplexing: Stop Reconnecting Every Time
Master SSH ControlMaster, ControlPath, and ControlPersist. Reuse connections for lightning-fast SSH, SCP, and rsync operations.
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The Linux OOM Killer: Why It's Killing Your App
Understand the OOM killer, read dmesg logs, protect critical processes with oom_score_adj.
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Stop Putting Passwords in Docker ENV
ENV bakes secrets into layers visible in docker history. Use BuildKit --secret, runtime vars, or .env files.
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find Flags You Keep Forgetting
Practical find command examples: -mtime, -newer, -type, -exec vs xargs, -not, size filters. The patterns you google every time.
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