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>
86 lines
7.8 KiB
Markdown
86 lines
7.8 KiB
Markdown
---
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created: 2026-04-02T16:03
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updated: 2026-04-13T10:10
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---
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* [Home](index.md)
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* [Linux & Sysadmin](01-linux/index.md)
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* [Linux File Permissions](01-linux/files-permissions/linux-file-permissions.md)
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* [Managing Linux Services with systemd](01-linux/process-management/managing-linux-services-systemd-ansible.md)
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* [SSH Config & Key Management](01-linux/networking/ssh-config-key-management.md)
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* [Package Management Reference](01-linux/packages/package-management-reference.md)
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* [Ansible Getting Started](01-linux/shell-scripting/ansible-getting-started.md)
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* [Bash Scripting Patterns](01-linux/shell-scripting/bash-scripting-patterns.md)
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* [SnapRAID & MergerFS Storage Setup](01-linux/storage/snapraid-mergerfs-setup.md)
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* [mdadm — Rebuilding a RAID Array After Reinstall](01-linux/storage/mdadm-raid-rebuild.md)
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* [Linux Distro Guide for Beginners](01-linux/distro-specific/linux-distro-guide-beginners.md)
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* [WSL2 Instance Migration to Fedora 43](01-linux/distro-specific/wsl2-instance-migration-fedora43.md)
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* [WSL2 Training Environment Rebuild](01-linux/distro-specific/wsl2-rebuild-fedora43-training-env.md)
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* [WSL2 Backup via PowerShell](01-linux/distro-specific/wsl2-backup-powershell.md)
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* [Self-Hosting & Homelab](02-selfhosting/index.md)
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* [Self-Hosting Starter Guide](02-selfhosting/docker/self-hosting-starter-guide.md)
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* [Docker vs VMs for the Homelab](02-selfhosting/docker/docker-vs-vms-homelab.md)
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* [Debugging Broken Docker Containers](02-selfhosting/docker/debugging-broken-docker-containers.md)
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* [Docker Healthchecks](02-selfhosting/docker/docker-healthchecks.md)
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* [Setting Up Caddy as a Reverse Proxy](02-selfhosting/reverse-proxy/setting-up-caddy-reverse-proxy.md)
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* [Tailscale for Homelab Remote Access](02-selfhosting/dns-networking/tailscale-homelab-remote-access.md)
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* [Network Overview](02-selfhosting/dns-networking/network-overview.md)
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* [rsync Backup Patterns](02-selfhosting/storage-backup/rsync-backup-patterns.md)
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* [Tuning Netdata Web Log Alerts](02-selfhosting/monitoring/tuning-netdata-web-log-alerts.md)
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* [Tuning Netdata Docker Health Alarms](02-selfhosting/monitoring/netdata-docker-health-alarm-tuning.md)
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* [Deploying Netdata to a New Server](02-selfhosting/monitoring/netdata-new-server-setup.md)
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* [Netdata SELinux AVC Denial Monitoring](02-selfhosting/monitoring/netdata-selinux-avc-chart.md)
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* [Netdata n8n Enriched Alert Emails](02-selfhosting/monitoring/netdata-n8n-enriched-alerts.md)
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* [Updating n8n Running in Docker](02-selfhosting/services/updating-n8n-docker.md)
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* [Mastodon Instance Tuning](02-selfhosting/services/mastodon-instance-tuning.md)
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* [Linux Server Hardening Checklist](02-selfhosting/security/linux-server-hardening-checklist.md)
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* [Standardizing unattended-upgrades with Ansible](02-selfhosting/security/ansible-unattended-upgrades-fleet.md)
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* [Fail2ban Custom Jail: Apache 404 Scanner Detection](02-selfhosting/security/fail2ban-apache-404-scanner-jail.md)
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* [Fail2ban Custom Jail: WordPress Login Brute Force](02-selfhosting/security/fail2ban-wordpress-login-jail.md)
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* [SELinux: Fixing Fail2ban grep execmem Denial](02-selfhosting/security/selinux-fail2ban-execmem-fix.md)
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* [UFW Firewall Management](02-selfhosting/security/ufw-firewall-management.md)
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* [Open Source & Alternatives](03-opensource/index.md)
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* [SearXNG: Private Self-Hosted Search](03-opensource/alternatives/searxng.md)
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* [FreshRSS: Self-Hosted RSS Reader](03-opensource/alternatives/freshrss.md)
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* [Gitea: Self-Hosted Git](03-opensource/alternatives/gitea.md)
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* [rmlint: Duplicate File Scanning](03-opensource/productivity/rmlint-duplicate-scanning.md)
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* [tmux: Persistent Terminal Sessions](03-opensource/dev-tools/tmux.md)
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* [screen: Simple Persistent Sessions](03-opensource/dev-tools/screen.md)
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* [rsync: Fast, Resumable File Transfers](03-opensource/dev-tools/rsync.md)
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* [Ventoy: Multi-Boot USB Tool](03-opensource/dev-tools/ventoy.md)
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* [Vaultwarden: Self-Hosted Password Manager](03-opensource/privacy-security/vaultwarden.md)
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* [yt-dlp: Video Downloading](03-opensource/media-creative/yt-dlp.md)
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* [Streaming & Podcasting](04-streaming/index.md)
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* [OBS Studio Setup & Encoding](04-streaming/obs/obs-studio-setup-encoding.md)
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* [Plex 4K Codec Compatibility (Apple TV)](04-streaming/plex/plex-4k-codec-compatibility.md)
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* [Troubleshooting](05-troubleshooting/index.md)
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* [Apache Outage: Fail2ban Self-Ban + Missing iptables Rules](05-troubleshooting/networking/fail2ban-self-ban-apache-outage.md)
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* [Mail Client Stops Receiving: Fail2ban IMAP Self-Ban](05-troubleshooting/networking/fail2ban-imap-self-ban-mail-client.md)
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* [firewalld: Mail Ports Wiped After Reload](05-troubleshooting/networking/firewalld-mail-ports-reset.md)
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* [Tailscale SSH: Unexpected Re-Authentication Prompt](05-troubleshooting/networking/tailscale-ssh-reauth-prompt.md)
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* [Fail2ban & UFW Rule Bloat Cleanup](05-troubleshooting/networking/fail2ban-ufw-rule-bloat-cleanup.md)
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* [Custom Fail2ban Jail: Apache Directory Scanning](05-troubleshooting/security/apache-dirscan-fail2ban-jail.md)
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* [Nextcloud AIO Unhealthy 20h After Nightly Update](05-troubleshooting/docker/nextcloud-aio-unhealthy-20h-stuck.md)
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* [n8n Behind Reverse Proxy: X-Forwarded-For Trust Fix](05-troubleshooting/docker/n8n-proxy-trust-x-forwarded-for.md)
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* [Docker & Caddy Recovery After Reboot (Fedora + SELinux)](05-troubleshooting/docker-caddy-selinux-post-reboot-recovery.md)
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* [ISP SNI Filtering with Caddy](05-troubleshooting/isp-sni-filtering-caddy.md)
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* [Obsidian Vault Recovery — Loading Cache Hang](05-troubleshooting/obsidian-cache-hang-recovery.md)
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* [Qwen2.5-14B OOM on RTX 3080 Ti (12GB)](05-troubleshooting/gpu-display/qwen-14b-oom-3080ti.md)
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* [yt-dlp YouTube JS Challenge Fix on Fedora](05-troubleshooting/yt-dlp-fedora-js-challenge.md)
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* [Gemini CLI Manual Update](05-troubleshooting/gemini-cli-manual-update.md)
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* [MajorWiki Setup & Publishing Pipeline](05-troubleshooting/majwiki-setup-and-pipeline.md)
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* [Gitea Actions Runner: Boot Race Condition Fix](05-troubleshooting/gitea-runner-boot-race-network-target.md)
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* [Cron Heartbeat False Alarm: /var/run Cleared by Reboot](05-troubleshooting/cron-heartbeat-tmpfs-reboot-false-alarm.md)
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* [SELinux: Fixing Dovecot Mail Spool Context (/var/vmail)](05-troubleshooting/selinux-dovecot-vmail-context.md)
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* [mdadm RAID Recovery After USB Hub Disconnect](05-troubleshooting/storage/mdadm-usb-hub-disconnect-recovery.md)
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* [Windows OpenSSH Server (sshd) Stops After Reboot](05-troubleshooting/networking/windows-sshd-stops-after-reboot.md)
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* [Windows OpenSSH: WSL Default Shell Breaks Remote Commands](05-troubleshooting/networking/windows-openssh-wsl-default-shell-breaks-remote-commands.md)
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* [Ollama Drops Off Tailscale When Mac Sleeps](05-troubleshooting/ollama-macos-sleep-tailscale-disconnect.md)
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* [macOS: Repeating Alert Tone from Mirrored iPhone Notification](05-troubleshooting/macos-mirrored-notification-alert-loop.md)
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* [ClamAV CPU Spike: Safe Scheduling with nice/ionice](05-troubleshooting/security/clamscan-cpu-spike-nice-ionice.md)
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* [Ansible: Vault Password File Not Found](05-troubleshooting/ansible-vault-password-file-missing.md)
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* [Ansible: ansible.cfg Ignored on WSL2 Windows Mounts](05-troubleshooting/ansible-wsl2-world-writable-mount-ignores-cfg.md)
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* [Ansible: SSH Timeout During dnf upgrade on Fedora Hosts](05-troubleshooting/ansible-ssh-timeout-dnf-upgrade.md)
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* [Fedora Networking & Kernel Troubleshooting](05-troubleshooting/fedora-networking-kernel-recovery.md)
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* [Systemd Session Scope Fails at Login](05-troubleshooting/systemd/session-scope-failure-at-login.md)
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* [wget/curl: URLs with Special Characters Fail in Bash](05-troubleshooting/wget-url-special-characters.md)
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