mrcharles
4f82520e0e
Root cause of Uptime Kuma DNS up/down alerts: Pi-hole's upstream config included Google IPv6 DNS (2001:4860:4860::8888), but netinfra-01 has no IPv6 internet route. Every forwarded query to the IPv6 upstream failed with "Network unreachable", causing intermittent DNS resolution failures every ~8 seconds. Fix applied to both netinfra-01 and netinfra-02: - Pi-hole upstream set to 8.8.8.8 only (IPv4); removed 192.168.3.16 (retired netboot) and 2001:4860:4860::8888 (IPv6 Google DNS) - IPv6 disabled at kernel level (/etc/sysctl.d/99-disable-ipv6.conf) - knel.net authoritative resolution unchanged (Technitium via revServers) Verified: zero IPv6 warnings, zero connection errors, DNS resolving cleanly from all paths after fix. [#376]
51 lines
1.4 KiB
YAML
51 lines
1.4 KiB
YAML
services:
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pihole:
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container_name: pihole
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# Root cause of the 2026-08 gravity.db corruption: default /dev/shm (64M)
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# was too small for FTL's shared-memory metrics. 1024M has been stable.
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shm_size: '1024M'
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image: pihole/pihole:latest
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hostname: pihole
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entrypoint: ["/usr/local/bin/gravity-validate.sh"]
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ports:
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- "53:53/tcp"
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- "53:53/udp"
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- "10002:80/tcp"
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- "10003:443/tcp"
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environment:
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TZ: 'America/Chicago'
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FTLCONF_webserver_api_password: '${PIHOLE_WEB_PASSWORD}'
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FTLCONF_dns_listeningMode: 'all'
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FTLCONF_dns_upstreams: '["8.8.8.8"]'
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volumes:
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- './etc-pihole:/etc/pihole'
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- './etc-dnsmasq.d:/etc/dnsmasq.d'
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- './gravity-validate.sh:/usr/local/bin/gravity-validate.sh:ro'
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cap_add:
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- SYS_NICE
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restart: always
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healthcheck:
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test: ["CMD-SHELL", "dig +short +norecurse @127.0.0.1 pi.hole >/dev/null 2>&1 && test -s /etc/pihole/gravity.db || exit 1"]
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interval: 30s
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timeout: 10s
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retries: 3
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start_period: 60s
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labels:
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autoheal: "true"
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networks:
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- default
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- dnsnet
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autoheal:
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container_name: autoheal
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image: willfarrell/autoheal:latest
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environment:
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AUTOHEAL_CONTAINER_LABEL: autoheal
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AUTOHEAL_INTERVAL: 30
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AUTOHEAL_START_PERIOD: 60
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volumes:
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- '/var/run/docker.sock:/var/run/docker.sock:ro'
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restart: always
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networks:
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dnsnet:
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external: true
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