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MajorLinux 631d7e8bc5 Logwatch fleet article: add Fedora CA bundle diagnosis + bounce-source guidance 
Documents three lessons from the 2026-05-10 fleet outage where the
Fedora half (majorhome, majorlab) had been silently failing to send
notification mail for days:

- Missing /etc/pki/tls/certs/ca-bundle.crt symlink (extracted bundle
  exists at /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem but the
  consumer-path symlink was lost during a ca-certificates package
  event). Diagnosis includes the cross-tool tell — dnf and curl break
  with the same path. Fix is a single ln -sfn.
- Methodology: Fedora and majormail log postfix to journald; Debian and
  Ubuntu log to /var/log/mail.log. Querying the wrong source returns
  false negatives for healthy hosts.
- Bounce-source addresses (Watchtower NOTIFICATION_EMAIL_FROM,
  fail2ban sender, root@<host>.localdomain) must resolve to real
  mailboxes — otherwise the first failed delivery generates
  bounce-of-bounce churn.

Also promoting the article from untracked to committed; it had been
authored on 2026-05-09 and not yet added to the repo.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-10 12:08:15 -04:00

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created updated
2026-04-06T09:52 2026-05-10T01:30

MajorLinux Tech Wiki — Index

A growing reference of Linux, self-hosting, open source, streaming, and troubleshooting guides. Written by MajorLinux. Used by MajorTwin.

Last updated: 2026-05-10 Article count: 110

Domains

Domain Folder Articles
🐧 Linux & Sysadmin 01-linux/ 12
🏠 Self-Hosting & Homelab 02-selfhosting/ 39
🔓 Open Source Tools 03-opensource/ 10
🎙️ Streaming & Podcasting 04-streaming/ 2
🔧 General Troubleshooting 05-troubleshooting/ 47

🐧 Linux & Sysadmin

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🏠 Self-Hosting & Homelab

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🔓 Open Source Tools

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🔧 General Troubleshooting

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Recently Updated

Date Article Domain
2026-05-10 Logwatch Fleet Setup — Surviving Package Upgrades — added Fedora CA bundle missing diagnosis, journald-vs-mail.log methodology note, and bounce-source-must-be-real-mailbox section Self-Hosting
2026-05-10 ClamAV Fleet Deployment with Ansible — added DigitalOcean monitoring caveat for 1vCPU droplets (with follow-up note: per-droplet relaxed alert can still trip; accept-the-page decision) Self-Hosting
2026-05-10 Claude Desktop MCP Mass-Disconnect After Blocking SSH Reboot Troubleshooting
2026-05-10 Castopod Posts Don't Appear on Mastodon — Diagnosing the Federation Path Troubleshooting
2026-05-08 Castopod: Stale Federated Avatar URLs After Remote Profile Updates Troubleshooting
2026-05-08 Tuning Netdata web_log_1m_successful for Redirect-Heavy WordPress Sites Troubleshooting
2026-05-07 Mastodon — The --prune-profiles Trap and How to Recover Self-Hosting
2026-05-02 WSL2 Backup via PowerShell Scheduled Task Linux
2026-05-02 SSH Config and Key Management Linux
2026-05-02 Wake-on-LAN via Router SSH Self-Hosting
2026-05-02 Tuning Netdata Docker Health Alarms to Prevent Update Flapping Self-Hosting
2026-05-02 ClamAV Fleet Deployment with Ansible Self-Hosting
2026-05-02 Fail2Ban Digest Mode — Fleet-Wide Quiet Alerts Self-Hosting
2026-05-02 Mastodon Instance Tuning Self-Hosting
2026-05-02 Ansible Check Mode False Positives in Verify/Assert Tasks Troubleshooting
2026-05-02 ISP SNI Filtering & Caddy Troubleshooting Troubleshooting
2026-05-02 Windows OpenSSH: WSL as Default Shell Breaks Remote Commands Troubleshooting
2026-05-02 Windows OpenSSH Server (sshd) Stops After Reboot Troubleshooting
2026-05-02 yt-dlp YouTube JS Challenge Fix (Fedora) Troubleshooting
2026-04-30 wp-fail2ban Plugin Logpath on Debian/Ubuntu (auth.log, not syslog) Self-Hosting
2026-04-30 LoRA adapter — GGUF conversion fails with 'config.json not found Troubleshooting
2026-04-29 iOS Tailscale Clients Report HostName="localhost" — Breaks /etc/hosts Generators Troubleshooting
2026-04-29 Python smtplib: Missing Date/Message-ID Headers Break Mail Clients Troubleshooting
2026-04-28 Ubuntu dist-upgrade Quarantines Third-Party Repos Troubleshooting
2026-04-26 Fantastical MCP Server: Permission Denied on Launch (macOS Quarantine) Troubleshooting
2026-04-25 rsync over Tailscale: Hung in TCP Teardown After Transfer Completes Troubleshooting
2026-04-25 Ollama: ollama run with Piped Stdin Bypasses Chat Template + SYSTEM Prompt Troubleshooting
2026-04-24 Fantastical Google Sync Error Flood — Phantom Calendars Fixed via syncselect Troubleshooting
2026-04-23 Pi-hole DoH / DoT Bypass Defense Self-Hosting
2026-04-22 Pi-hole v6 Adlist Management via SQL Self-Hosting
2026-04-22 Pi-hole v6 Group Management: Per-Client DNS Rules Self-Hosting
2026-04-22 Mastodon DB Maintenance — Statuses, Accounts, and VACUUM Self-Hosting
2026-04-22 Mastodon Federation — Domain Blocks, Silencing, and FediSeer Self-Hosting
2026-04-22 Pi-hole AI Blocklist Blocks Claude Desktop (ERR_CONNECTION_REFUSED) Troubleshooting
2026-04-21 Ansible Fails with Permission Denied While ssh <alias> Works (Host Alias Bypass) Troubleshooting
2026-04-20 Claude Code Remote Control — Mobile Access to a Persistent Host Session Self-Hosting
2026-04-19 AWS S3 Cost Management Self-Hosting

Writing Backlog

Topic Domain Priority From Gap?
Docker Compose networking deep dive Self-Hosting High No
Troubleshooting NVIDIA on Linux Troubleshooting Medium No
Pi-hole setup and local DNS Self-Hosting Medium No
Nextcloud setup with Docker Self-Hosting Medium No

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