MajorLinux
326c87421f
Captures the majorlab incident where the backup watchdog emailed a missing heartbeat after a kernel-update reboot wiped /var/run, even though the backup had actually completed cleanly. Documents the tmpfs root cause and the fix of storing heartbeats under /var/lib instead. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
47 lines
2.4 KiB
Markdown
47 lines
2.4 KiB
Markdown
---
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created: 2026-03-15T06:37
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updated: 2026-04-13T10:10
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---
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# 🔧 General Troubleshooting
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Practical fixes for common Linux, networking, and application problems.
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## 🖥️ GPU & AI
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- [Qwen2.5-14B OOM on RTX 3080 Ti (12GB)](gpu-display/qwen-14b-oom-3080ti.md)
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## 🌐 Networking & Web
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- [Apache Outage: Fail2ban Self-Ban + Missing iptables Rules](networking/fail2ban-self-ban-apache-outage.md)
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- [Mail Client Stops Receiving: Fail2ban IMAP Self-Ban](networking/fail2ban-imap-self-ban-mail-client.md)
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- [firewalld: Mail Ports Wiped After Reload](networking/firewalld-mail-ports-reset.md)
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- [Tailscale SSH: Unexpected Re-Authentication Prompt](networking/tailscale-ssh-reauth-prompt.md)
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- [Windows OpenSSH: WSL Default Shell Breaks Remote Commands](networking/windows-openssh-wsl-default-shell-breaks-remote-commands.md)
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- [ISP SNI Filtering & Caddy](isp-sni-filtering-caddy.md)
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- [yt-dlp YouTube JS Challenge Fix](yt-dlp-fedora-js-challenge.md)
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- [wget/curl: URLs with Special Characters Fail in Bash](wget-url-special-characters.md)
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## ⚙️ Ansible & Fleet Management
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- [SSH Timeout During dnf upgrade on Fedora Hosts](ansible-ssh-timeout-dnf-upgrade.md)
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- [Vault Password File Missing](ansible-vault-password-file-missing.md)
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- [ansible.cfg Ignored on WSL2 Windows Mounts](ansible-wsl2-world-writable-mount-ignores-cfg.md)
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## 📦 Docker & Systems
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- [Docker & Caddy Recovery After Reboot (Fedora + SELinux)](docker-caddy-selinux-post-reboot-recovery.md)
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- [Gitea Actions Runner: Boot Race Condition Fix](gitea-runner-boot-race-network-target.md)
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- [Systemd Session Scope Fails at Login (`session-cN.scope`)](systemd/session-scope-failure-at-login.md)
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- [MajorWiki Setup & Publishing Pipeline](majwiki-setup-and-pipeline.md)
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- [Cron Heartbeat False Alarm: /var/run Cleared by Reboot](cron-heartbeat-tmpfs-reboot-false-alarm.md)
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## 🔒 SELinux
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- [SELinux: Fixing Dovecot Mail Spool Context (/var/vmail)](selinux-dovecot-vmail-context.md)
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## 💾 Storage
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- [mdadm RAID Recovery After USB Hub Disconnect](storage/mdadm-usb-hub-disconnect-recovery.md)
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## 📝 Application Specific
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- [Obsidian Vault Recovery — Loading Cache Hang](obsidian-cache-hang-recovery.md)
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- [Gemini CLI Manual Update](gemini-cli-manual-update.md)
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## 🤖 AI / Local LLM
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- [Ollama Drops Off Tailscale When Mac Sleeps](ollama-macos-sleep-tailscale-disconnect.md)
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- [Windows OpenSSH Server (sshd) Stops After Reboot](networking/windows-sshd-stops-after-reboot.md)
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