this post was submitted on 15 Apr 2024
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12
Running DNS server in Docker (jlai.lu)
submitted 7 months ago by fendrax@jlai.lu to c/selfhosted@lemmy.world
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Hi everyone,

I own a homeserver running multiple services set up in individual docker compose projects. One of them is dnsmasq + pi-hole. Pi-hole is exposed on the host's 53 port and uses dnsmasq as upstream. The host's /etc/resolv.conf points to 127.0.0.1 to use pi-hole. Other containers from other compose projects on the same machine indirectly use pi-hole as well, as they use docker's embedded DNS which forwards to the host.

Everything had worked fine for weeks before I ran into an issue after unattended-upgrades updated docker. After the upgrade, systemd attempted to restart the docker service. From the logs, it seems that the containers had a hard time honoring the SIGTERM. They started to complain about failing to reach the DNS server. At least that's my understanding from journalctl -u docker. Here's a (long) excerpt that shows:

  • containers failing to stop gracefully
  • stale processes after docker forcibly shut them down
  • repeated errors "stream copy error: reading from a closed fifo" afterwards that I am wondering what they mean
avril 12 06:46:24 prosper systemd[1]: Stopping docker.service - Docker Application Container Engine...
avril 12 06:46:24 prosper dockerd[1580]: time="2024-04-12T06:46:24.161850246+02:00" level=info msg="Processing signal 'terminated'"
avril 12 06:46:33 prosper dockerd[1580]: time="2024-04-12T06:46:33.276053218+02:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:127.0.0.1:37197" dns-server="udp:127.0.0.1:53" error="read udp 127.0.0.>
avril 12 06:46:34 prosper dockerd[1580]: time="2024-04-12T06:46:34.509762706+02:00" level=info msg="ignoring event" container=d518bb77113596e96db39a6770fd9955ec29efacd907cdb02148708e92156cd5 module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:34 prosper dockerd[1580]: time="2024-04-12T06:46:34.989217237+02:00" level=info msg="ignoring event" container=81b3413f7d2409fe1a8fd8e1cf7dce3a23a6f7a4dc7cc23c13e9f1ba84b24eb7 module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:34 prosper dockerd[1580]: time="2024-04-12T06:46:34.989312976+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=642a3c9a2c821727f30c5cf84aac52778c027083f61d571831a408a2a8c>
avril 12 06:46:34 prosper dockerd[1580]: time="2024-04-12T06:46:34.989126980+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=781a3eac3f08d78ef285bc0231c00bd52005fe2257fd358f7c2b51af392>
avril 12 06:46:34 prosper dockerd[1580]: time="2024-04-12T06:46:34.989532834+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=7406c47622ecf7fb3f9e9ff6b7a8be2a3920342b4921b33a32b3df45123>
avril 12 06:46:34 prosper dockerd[1580]: time="2024-04-12T06:46:34.989693081+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=e5311ad000d63615c2336db1d3630cde233495108029648289f3660ad2d>
avril 12 06:46:34 prosper dockerd[1580]: time="2024-04-12T06:46:34.989723995+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=e6194d95ed1b95dddeaacab68f64a8e869c7a2489144198a84865d57f89>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.350637865+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=249922bad7603a6e00bbcb0528cb7b7774a321f23e9f81b9784cc5968b5>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.506956200+02:00" level=info msg="ignoring event" container=a5ac3703480cbfd4455d4d0b373023f730da63a8792863e19bfda469ee44370b module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.602466692+02:00" level=info msg="ignoring event" container=1bd974e7ccf8f77ed93b51aa9eb0bed07cd0e26db7201fecb33c5c6f82712cb2 module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.661037905+02:00" level=info msg="ignoring event" container=881fbf5034c7c0016b0715a8028e2c69788ddff218bc70fef98b30019d2b48bd module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.714184730+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=0d9862444b4a7fce35df527f034e4f673aecf44a6551858056f9d8c7ce4>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.775230427+02:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:127.0.0.1:42577" dns-server="udp:127.0.0.1:53" error="read udp 127.0.0.>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.881449888+02:00" level=info msg="Container failed to exit within 10s of signal 2 - using the force" container=c0147e337cee407e7ab9b133bd20667d287d6e2e121259c4794e4e090b12>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.893446715+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=0eecbecfcaa2639946f0ed4a61a36f6ef004453af793cab91a52a97724d>
avril 12 06:46:35 prosper dockerd[1580]: time="2024-04-12T06:46:35.987621257+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=3493720ae2fc565fdc052a1d137590818d418d290f4418ec6911cac4704>
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.186176914+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=5cee8cfa0e068dbda35e89bcaec19450b50a0903b13bd677f6a6cb61686>
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.186467614+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.186476595+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.214354986+02:00" level=info msg="ignoring event" container=e6194d95ed1b95dddeaacab68f64a8e869c7a2489144198a84865d57f8970a3f module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.339111902+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=8f42101141cf634f3495ae850b368a4b00ce065fb9a401ab7e1450d532b>
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.484546249+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=881fbf5034c7c0016b0715a8028e2c69788ddff218bc70fef98b30019d2>
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.728059697+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=1bd974e7ccf8f77ed93b51aa9eb0bed07cd0e26db7201fecb33c5c6f827>
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.753403840+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=d518bb77113596e96db39a6770fd9955ec29efacd907cdb02148708e921>
avril 12 06:46:36 prosper dockerd[1580]: time="2024-04-12T06:46:36.787737744+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=c39c900cb5ccd9ae3d48be4f953389edcab7bf051b9d505e23a816a8627>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.235834609+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=13a3101e56e66f045318ad572a19b259a8cd3fbe7772b82f9262c15b727>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.331772840+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=a5ac3703480cbfd4455d4d0b373023f730da63a8792863e19bfda469ee4>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.411877163+02:00" level=warning msg="Health check for container e6194d95ed1b95dddeaacab68f64a8e869c7a2489144198a84865d57f8970a3f error: context canceled"
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.705699519+02:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:127.0.0.1:58293" dns-server="udp:127.0.0.1:53" error="read udp 127.0.0.>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.748247132+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=81b3413f7d2409fe1a8fd8e1cf7dce3a23a6f7a4dc7cc23c13e9f1ba84b>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.790571926+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=e6e82f5a61e3b412c93abdd7fcc1cf25560e7d8ae957313fd36429f3ed7>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.811976559+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=48d78ba0c55912bd57f72c6934940ad173261364d13483e630769b670d0>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.832092046+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=0c7717003531fe815060e60da13065abe8399782c750d526e7fba872f0e>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.965233556+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=73b5051331f81477c6358d74e889fedf50bf0c57696fdd8a735e5a20f3b>
avril 12 06:46:37 prosper dockerd[1580]: time="2024-04-12T06:46:37.965447255+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=c73fda2593bbbeb66589373add0609f8a165eab6d3ef4f0fe9bc871b1ca>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.094152959+02:00" level=info msg="ignoring event" container=0eecbecfcaa2639946f0ed4a61a36f6ef004453af793cab91a52a97724d5225f module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.113626463+02:00" level=info msg="ignoring event" container=642a3c9a2c821727f30c5cf84aac52778c027083f61d571831a408a2a8c2c71f module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.113684911+02:00" level=info msg="ignoring event" container=e5311ad000d63615c2336db1d3630cde233495108029648289f3660ad2d6c33a module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.192923515+02:00" level=info msg="ignoring event" container=8f42101141cf634f3495ae850b368a4b00ce065fb9a401ab7e1450d532b917ba module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.212691218+02:00" level=info msg="ignoring event" container=7406c47622ecf7fb3f9e9ff6b7a8be2a3920342b4921b33a32b3df45123878f2 module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.282823538+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=a8be522903b221bd8af2b6bf0533b56bc828863852d17fa604ed932d8cd>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.364351179+02:00" level=info msg="ignoring event" container=249922bad7603a6e00bbcb0528cb7b7774a321f23e9f81b9784cc5968b54ca54 module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.433220060+02:00" level=info msg="ignoring event" container=0d9862444b4a7fce35df527f034e4f673aecf44a6551858056f9d8c7ce44dbd4 module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.435651309+02:00" level=error msg="[resolver] failed to query external DNS server" client-addr="udp:127.0.0.1:59049" dns-server="udp:127.0.0.1:53" error="read udp 127.0.0.>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.503015026+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=6c0fcacc03cef94239fadb71e55ded7b01d07ed075023966427072d480a>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.531879355+02:00" level=info msg="Container failed to exit within 10s of signal 28 - using the force" container=6290112ab909221f1d3eee48a09e49403c1f61b7e1675ab3e581649ea82>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.789853647+02:00" level=info msg="Container failed to exit within 10s of signal 28 - using the force" container=89d8e915dc9ab961502830d0f8086d1a4b709d726d69e6d26570463219a>
avril 12 06:46:38 prosper dockerd[1580]: time="2024-04-12T06:46:38.928854916+02:00" level=info msg="ignoring event" container=5cee8cfa0e068dbda35e89bcaec19450b50a0903b13bd677f6a6cb6168675d21 module=libcontainerd namespace=moby topic=/tas>
avril 12 06:46:39 prosper dockerd[1580]: time="2024-04-12T06:46:39.089539561+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=b52727b63c13631c15b7b22d400f2c913ae73a2f5b36b0f566bef0ba645>
avril 12 06:46:39 prosper dockerd[1580]: time="2024-04-12T06:46:39.202791198+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=deda565519df8cd8705fff76564af4a084514fea41fe03ca1ab7e56f14b>
avril 12 06:46:39 prosper dockerd[1580]: time="2024-04-12T06:46:39.290584165+02:00" level=error msg="Force shutdown daemon"
avril 12 06:46:39 prosper dockerd[1580]: time="2024-04-12T06:46:39.567930258+02:00" level=info msg="Container failed to exit within 10s of signal 15 - using the force" container=c813f03c24c960653e28a9857a5d7f1fde677bcd3e226ed1585d41626a9>
avril 12 06:46:39 prosper dockerd[1580]: time="2024-04-12T06:46:39.725804932+02:00" level=info msg="Daemon shutdown complete"
avril 12 06:46:42 prosper systemd[1]: docker.service: Deactivated successfully.
avril 12 06:46:42 prosper systemd[1]: docker.service: Unit process 15700 (docker-proxy) remains running after unit stopped.
avril 12 06:46:42 prosper systemd[1]: docker.service: Unit process 15979 (docker-proxy) remains running after unit stopped.
avril 12 06:46:42 prosper systemd[1]: docker.service: Unit process 18294 (docker-proxy) remains running after unit stopped.
avril 12 06:46:42 prosper systemd[1]: Stopped docker.service - Docker Application Container Engine.
avril 12 06:46:42 prosper systemd[1]: docker.service: Consumed 3h 16min 43.639s CPU time.
avril 12 06:46:42 prosper systemd[1]: docker.service: Found left-over process 15700 (docker-proxy) in control group while starting unit. Ignoring.
avril 12 06:46:42 prosper systemd[1]: This usually indicates unclean termination of a previous run, or service implementation deficiencies.
avril 12 06:46:42 prosper systemd[1]: docker.service: Found left-over process 15979 (docker-proxy) in control group while starting unit. Ignoring.
avril 12 06:46:42 prosper systemd[1]: This usually indicates unclean termination of a previous run, or service implementation deficiencies.
avril 12 06:46:42 prosper systemd[1]: docker.service: Found left-over process 18294 (docker-proxy) in control group while starting unit. Ignoring.
avril 12 06:46:42 prosper systemd[1]: This usually indicates unclean termination of a previous run, or service implementation deficiencies.
avril 12 06:46:42 prosper systemd[1]: Starting docker.service - Docker Application Container Engine...
avril 12 06:46:44 prosper dockerd[276530]: time="2024-04-12T06:46:44.366430751+02:00" level=info msg="Starting up"
avril 12 06:46:45 prosper dockerd[276530]: time="2024-04-12T06:46:45.443488954+02:00" level=info msg="[graphdriver] using prior storage driver: overlay2"
avril 12 06:46:57 prosper dockerd[276530]: time="2024-04-12T06:46:57.117503878+02:00" level=info msg="Loading containers: start."
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.071827546+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.074049075+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.077609642+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.077684622+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.082780007+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.084236865+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.088120145+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.088249509+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.168036186+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.168083531+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.169898516+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.171988424+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.172240688+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.172348881+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.173855919+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.176585486+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.178804059+02:00" level=info msg="ignoring event" container=781a3eac3f08d78ef285bc0231c00bd52005fe2257fd358f7c2b51af39266c42 module=libcontainerd namespace=moby topic=/t>
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.180166037+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.185876045+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.270156961+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.270186688+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.281083861+02:00" level=info msg="ignoring event" container=89d8e915dc9ab961502830d0f8086d1a4b709d726d69e6d26570463219a620f1 module=libcontainerd namespace=moby topic=/t>
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.282779586+02:00" level=info msg="ignoring event" container=6290112ab909221f1d3eee48a09e49403c1f61b7e1675ab3e581649ea829ad0f module=libcontainerd namespace=moby topic=/t>
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.298497572+02:00" level=info msg="ignoring event" container=b52727b63c13631c15b7b22d400f2c913ae73a2f5b36b0f566bef0ba645e7c0f module=libcontainerd namespace=moby topic=/t>
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.316205371+02:00" level=info msg="ignoring event" container=c73fda2593bbbeb66589373add0609f8a165eab6d3ef4f0fe9bc871b1ca315a7 module=libcontainerd namespace=moby topic=/t>
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.316278998+02:00" level=info msg="ignoring event" container=3493720ae2fc565fdc052a1d137590818d418d290f4418ec6911cac4704eb7e8 module=libcontainerd namespace=moby topic=/t>
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.341300109+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.341872295+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.370180971+02:00" level=info msg="ignoring event" container=6c0fcacc03cef94239fadb71e55ded7b01d07ed075023966427072d480ab42f7 module=libcontainerd namespace=moby topic=/t>
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.382180381+02:00" level=info msg="ignoring event" container=c0147e337cee407e7ab9b133bd20667d287d6e2e121259c4794e4e090b123e11 module=libcontainerd namespace=moby topic=/t>
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.436201339+02:00" level=error msg="stream copy error: reading from a closed fifo"
avril 12 06:46:58 prosper dockerd[276530]: time="2024-04-12T06:46:58.436352997+02:00" level=error msg="stream copy error: reading from a closed fifo"

I ssh'ed into the server and noticed that the pi-hole & dnsmasq containers were not running. I ran docker compose up -d in all projects, starting with the DNS one and it went back to normal.

My question is: how bad of an idea is this to run a DNS in docker and use it for the host and other containers? Maybe I just had back luck but I can't help thinking this setup creates some sort of circular dependency between the host, docker and the containers.

If anyone has experience with a similar setup, I'd be curious to hear their opinion on the issue I ran into.

Thanks!

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[–] TheHolm@aussie.zone 1 points 7 months ago (1 children)

circular dependency seems to be the case. I guess adding second external resolver to /etc/resolve.conf will help. Second entry will not be used unless first one ( pi-hole) is responding. But it need to be tested.
BTW, why do you want to send host's DNS via pihole?

[–] fendrax@jlai.lu 1 points 7 months ago

Well, I have not really thought about why. I guess that's partly due to old habits of running services on the host with systemd (my migration to docker is recent and still a work in progress). But I guess I'd like to continue to be able to resolve names of local devices on my network when connected through ssh on the host. Is that inherently wrong, still? I will implement the secondary DNS as a fallback. I am hoping to get rid of the issue that way.