Documents the gotcha discovered during the 2026-04-30 DCAProd XML-RPC
outage triage: wp-fail2ban plugin emits via PHP syslog(LOG_AUTH) which
lands in /var/log/auth.log on Debian/Ubuntu, not /var/log/syslog.
wordpress-{hard,soft,extra} jails configured with logpath=/var/log/syslog
(common in tutorials and ansible roles) silently catch zero events.
Article includes diagnostic steps, the fix, fail2ban-regex verification,
distro cheat sheet (Debian/Ubuntu vs RHEL/Fedora vs systemd-journal-only),
and a note on why wordpress-login is unaffected.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Covers creating groups, assigning clients, scoping allow rules to
specific groups via API and CLI. Includes ghost attribution gotcha
(router DNS proxy + secondary DNS causes FTL cache mis-attribution)
and the fix (Pi-hole as sole DNS, remove secondary).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
New article covering the conversion from per-ban email alerts to a
three-tier model (silent default, sshd/recidive immediate, daily digest).
Includes Ansible automation, gotchas with lineinfile regex collisions,
and fq-hostname override for clean subjects.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Articles from prior sessions that were written locally but never shipped:
- 02-selfhosting/cloud/aws-s3-cost-management.md — lifecycle rules, storage class selection, bucket inventory, unexpected-growth investigation
- 02-selfhosting/dns-networking/wake-on-lan-router-ssh.md — WOL magic packets via Asus router SSH + ether-wake, Ansible vault integration
- 02-selfhosting/services/claude-code-remote-control.md — mobile access to a persistent host Claude Code session
Nav updated (index.md + SUMMARY.md):
- Added Cloud subsection under Self-Hosting for aws-s3
- Added wake-on-lan and aws-s3 entries to SUMMARY
- Added claude-code-remote-control to index's Services section
- Added ansible-ssh-host-alias-bypass nav entry (article shipped in 2dbeb22)
- Article count 87 → 89, self-hosting 30 → 32, troubleshooting 33 → 34
Documents the 2026-04-09 scanner incident where 301-redirected PHP probes
bypassed the existing apache-404scan jail, leaving the scanner unbanned
and firing Netdata web_log_1m_redirects alerts. New jail catches 301/302/
403/404 PHP responses while excluding legitimate WordPress endpoints.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds a section documenting how missing HTTP/HTTPS rules caused a
site outage on tttpod, and updates the fleet reference table.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Article count 73 → 74. Added to SUMMARY.md, index.md, README.md,
and 02-selfhosting/index.md (which was also missing 5 other security
articles from prior sessions).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Access-log-based filter for wp-login.php brute force detection without
requiring the WP fail2ban plugin. Documents the backend=polling gotcha
on Ubuntu 24.04 and manual banning workflow.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Fixed 4 broken markdown links (bad relative paths in See Also sections)
- Corrected n8n port binding to 127.0.0.1:5678 (matches actual deployment)
- Updated SnapRAID article with actual majorhome paths (/majorRAID, disk1-3)
- Converted 67 Obsidian wikilinks to relative markdown links or plain text
- Added YAML frontmatter to 35 articles missing it entirely
- Completed frontmatter on 8 articles with missing fields
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
New article: selinux-fail2ban-execmem-fix.md — custom policy module
for fail2ban grep execmem denial on Fedora 43.
Also includes previously uncommitted:
- n8n-proxy-trust-x-forwarded-for.md
- fail2ban-apache-404-scanner-jail.md updates
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Global backend=systemd in jail.local silently breaks file-based jails.
Added required backend=polling to config, diagnostic command, and warning.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Covers version checking, pinned-tag update process, SQLite password
reset, and why Arcane may not catch updates when the latest tag lags
behind npm releases.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
New guide for custom access-log-based fail2ban jail that catches
rapid-fire 404 vulnerability scanners missed by default error-log jails.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add troubleshooting article for the 2026-03-27 incident where PHP-FPM
hung after the nightly update cycle. Update the Netdata Docker alarm
tuning article with the dedicated Nextcloud alarm split and the new
watchdog cron deployed to majorlab. (54 articles)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
