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CFG_NETWORK_MTU=1500 was baked blindly into the rootless daemon uplink (DOCKERD_ROOTLESS_ROOTLESSKIT_MTU) and every app's container network. On links whose real path MTU is below 1500 (Qubes/NAT/VPN with PMTU discovery blocked), image manifests + tiny images pull fine but large image LAYERS stall and reset mid-blob with "httpReadSeeker: ... EOF" — apps silently fail to install. Probed here: path MTU ~1328, Docker at 1500 → black hole. - New scripts/network/network_mtu.sh: networkDetectMtu (don't-fragment ICMP ladder → largest standard MTU that gets through, 1500 when ICMP gives no signal) + networkEffectiveMtu (CFG_NETWORK_MTU: a number is verbatim, "auto" probes once and caches $docker_dir/.network_mtu) + networkRedetectMtu. - CFG_NETWORK_MTU default 1500 -> auto. Rootless setup now writes the resolved MTU into the override (and re-detects per install); the per-app NETWORK_MTU_TAG uses the resolved value too. Explicit numbers still win. Verified on this box: auto -> 1300; alpine (multi-MB) + the full ~100MB navidrome image now pull to completion where they previously EOF'd. Applied live (override 1300, config=auto, cache=1300, rootless docker restarted). Signed-off-by: librelad <librelad@digitalangels.vip> Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
11 lines
1.2 KiB
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11 lines
1.2 KiB
Plaintext
Executable File
# ================================================================================
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# Docker Network - Network settings for the Docker Network **ADVANCED**
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# ================================================================================
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CFG_NETWORK_NAME=vpn # Network Name - Docker network name for container communication
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CFG_NETWORK_SUBNET=10.100.0.0/16 # Network Subnet - Subnet range for Docker network
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CFG_NETWORK_MTU=auto # Network MTU - Maximum transmission unit for network packets. 'auto' probes the real path MTU and clamps to a safe value (fixes large image pulls stalling with EOF on Qubes/NAT/VPN links where the path MTU is below 1500); or set an explicit number like 1500 or 1280. **ADVANCED**
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CFG_REQUIREMENT_DOCKER_NETWORK=true # Docker Network - Create and manage the Docker network for container communication
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CFG_REQUIREMENT_DOCKER_NETWORK_PRUNE=true # Network Cleanup - Automatically prune unused Docker networks
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CFG_REQUIREMENT_DOCKER_SWITCHER=true # Docker Switcher - Install the Docker version switching utility
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