b140d4d82a
- 313 new markdown files created - 30 relationships embedded - 313 entries indexed - State initialized with usage data
41 lines
1.2 KiB
Markdown
41 lines
1.2 KiB
Markdown
---
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id: 775506ce-ed06-4c36-95f3-73379855b44a
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type: fix
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title: "High CPU on Docker host from avahi-daemon and GNOME"
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tags: [cpu, docker, avahi, gnome, gdm, performance, homelab, fix]
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importance: 0.7
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confidence: 0.8
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created: "2025-12-20T04:36:05.718983+00:00"
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updated: "2025-12-20T04:36:05.718983+00:00"
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relations:
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- target: 62ee21e8-2b56-4d38-a73d-47e2724f08c6
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type: BUILDS_ON
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direction: incoming
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strength: 0.5
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---
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**Problem:** Docker host showing constant ~12% CPU usage from background services.
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**Root Cause:**
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1. avahi-daemon (mDNS) constantly processing Docker veth interface changes (67+ hours accumulated CPU)
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2. gvfs-udisks2-volume-monitor (GNOME disk monitor) running unnecessarily on server
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3. gdm and gnome-shell running on headless server
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**Solution:**
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```bash
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# Disable avahi (including socket to prevent respawn)
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sudo systemctl stop avahi-daemon.socket avahi-daemon
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sudo systemctl disable avahi-daemon.socket avahi-daemon
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# Disable GNOME desktop
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sudo systemctl stop gdm
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sudo systemctl disable gdm
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# Kill lingering processes
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sudo pkill -f gvfs-udisks2-volume-monitor
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```
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**Result:** ~12% CPU and 180MB RAM recovered.
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**When to apply:** Any Docker host with desktop environment installed that doesn't need GUI access.
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