Hi all - We’re enjoying discourse thus far. I’m having an issue with running a rebuild of the docker container. The container won’t rebuild because for some reason it can’t resolve github.com. I know the host system (debian jessie) can resolve at that time via dig && ping. However if I issue a systemctl restart docker the issue goes away. I turned to the goog or alphabet machine which suggested starting the docker daemon using the goog’s dns which I’ve done and confirmed that it seems to have taken via a systemctl status docker. I’ve been able to reproduce on a debian droplet and a virtual box vm. Also I’ve been able to successfully pull a Ubuntu image, and run the container. I’m not sure if there’s something in launcher or any other suggestions? Working off of git master, and is up to date. shortlist: Debian Jessie Kernel 3.16 Docker version 1.6.2, build 7c8fca2 launch rebuild app root@alpha:/var/discourse# ./launcher rebuild app Ensuring discourse docker is up to date Fetching origin Discourse Docker is up-to-date Stopping old container + /usr/bin/docker stop -t 10 app app cd /pups && git pull && /pups/bin/pups --stdin fatal: unable to access 'https://github.com/SamSaffron/pups.git/': Could not resolve host: github.com 210c421dbe03e0339d110f1eec9eb3c985b0a0d4e32709d569c9cd1f235a7964 ** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one systemctl status - shows --dns root@alpha:/var/discourse# systemctl status docker ● docker.service - Docker Application Container Engine Loaded: loaded (/lib/systemd/system/docker.service; enabled) Active: active (running) since Thu 2015-08-13 03:42:17 UTC; 26min ago Docs: http://docs.docker.com Main PID: 22232 (docker) CGroup: /system.slice/docker.service └─22232 /usr/bin/docker -d -H fd:// --dns 8.8.8.8 --dns 8.8.4.4 Aug 13 04:03:40 alpha docker[22232]: time="2015-08-13T04:03:40Z" level=info msg="+job wait(7d602b0addff82e7626b659c5e30131a11ab7f35034198983a19e2b8861111b5)" Aug 13 04:03:40 alpha docker[22232]: time="2015-08-13T04:03:40Z" level=info msg="-job wait(7d602b0addff82e7626b659c5e30131a11ab7f35034198983a19e2b88... = OK (0)" Aug 13 04:03:40 alpha docker[22232]: time="2015-08-13T04:03:40Z" level=info msg="DELETE /v1.18/containers/7d602b0addff82e7626b659c5e30131a11ab7f3503...8861111b5" Aug 13 04:03:40 alpha docker[22232]: time="2015-08-13T04:03:40Z" level=info msg="+job rm(7d602b0addff82e7626b659c5e30131a11ab7f35034198983a19e2b8861111b5)" Aug 13 04:03:40 alpha docker[22232]: time="2015-08-13T04:03:40Z" level=info msg="+job log(destroy, 7d602b0addff82e7626b659c5e30131a11ab7f35034198983...e:1.0.12)" Aug 13 04:03:40 alpha docker[22232]: time="2015-08-13T04:03:40Z" level=info msg="-job log(destroy, 7d602b0addff82e7626b659c5e30131a11ab7f35034198983... = OK (0)" Aug 13 04:03:40 alpha docker[22232]: time="2015-08-13T04:03:40Z" level=info msg="-job rm(7d602b0addff82e7626b659c5e30131a11ab7f35034198983a19e2b8861... = OK (0)" Aug 13 04:04:15 alpha docker[22232]: time="2015-08-13T04:04:15Z" level=info msg="GET /v1.18/containers/json" Aug 13 04:04:15 alpha docker[22232]: time="2015-08-13T04:04:15Z" level=info msg="+job containers()" Aug 13 04:04:15 alpha docker[22232]: time="2015-08-13T04:04:15Z" level=info msg="-job containers() = OK (0)" Hint: Some lines were ellipsized, use -l to show in full. docker info root@alpha:/var/discourse# docker info Containers: 3 Images: 18 Storage Driver: aufs Root Dir: /var/lib/docker/aufs Backing Filesystem: extfs Dirs: 24 Dirperm1 Supported: true Execution Driver: native-0.2 Kernel Version: 3.16.0-4-amd64 Operating System: Debian GNU/Linux 8 (jessie) CPUs: 1 Total Memory: 2.879 GiB Name: alpha ID: WF4H:KABY:JPTX:RW2U:FWCT:PNKZ:DR2P:2ZFE:ZLUD:AB4R:D3CH:EXCA WARNING: No memory limit support WARNING: No swap limit support edit: formatting fix code block

This is very likely the solution [תמונה] Failed to Bootstrap Ping is working to github Self-hosting Edit /etc/default/docker and uncomment the following line: DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4" After this, restart docker and rebuild. I had the same issue today. The solution is taken from https://meta.discourse.org/t/afatal-unable-to-access-https-github-com-samsaffron-pups-git-could-not-resolve-host-github-com/18611/7?u=stefan

Hi @sam thanks for taking the time to review. I have that option uncommented in /etc/defaults/docker, and I’ve restarted the docker service many times. To clarify, after restarting the docker service the laucher rebuild will work once, after that I have to restart the service. You can see this via my systemd status. CGroup: /system.slice/docker.service └─22232 /usr/bin/docker -d -H fd:// --dns 8.8.8.8 --dns 8.8.4.4

Same issue, I went to add the cloudflare template and when rebuilding it could not resolve github.com. I have already tried the solution of using googles DNS servers in dockers configuration file with no success. doing ping github.com works but again, it cant seem to resolve when rebuilding. Here is the error: [תמונה] Here is me pinging github.com Imgur: The magic of the Internet Interestingly though, when I ping6 github.com I of course do not recieve a response because github does not have AAAA records i believe. Imgur: The magic of the Internet Any idea how to fix this?

This isn’t a Discourse problem, it’s a Docker problem. You’ll probably get more knowledgeable help at the Docker support forums (which, helpfully, also run Discourse).

I figured out the issue and solution to this problem at least for me. The issue was that Docker uses 8.8.8.8 and 8.8.4.4 as its DNS and I had an OVH network based firewall blocking ALL IPv4 traffic that did not match port 80, 443, and a few other specific rules. I had to authorize IPv4 traffic for 8.8.8.8 and 8.8.4.4

I’m experiencing a similar issue on the latest discourse git. This started happening after performing a system update and/or discourse update via the web UI. Now when I try to rebuild the app, I get: [root@forum /var/discourse]# ./launcher rebuild app Ensuring launcher is up to date Fetching origin Launcher is up-to-date Stopping old container + /usr/bin/docker stop -t 60 app app cd /pups && git pull && /pups/bin/pups --stdin fatal: unable to access 'https://github.com/discourse/pups.git/': Could not resolve host: github.com 8f082ebcb977f9efafbdbff15ab69e8d06c0a7e2cb99410f85e1f90b03ae733b ** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one. ./discourse-doctor may help diagnose the problem. I can ping github.com and 8.8.8.8, and I’ve tried editing /etc/default/docker to toggle the DNS option: DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4" Where should I continue investigating this? This is Ubuntu 18.04 with latest updates applied.

I am getting the same error as gekkonen after having attempted to upgrade to the latest Discourse version. It appears Docker can no longer access the Internet at all from the default bridge network: docker run -it --net=bridge --rm busybox ping -c 1 github.com ping: bad address 'github.com' If I force it to use the host network, it can access the Internet: docker run -it --net=host --rm busybox ping -c 1 github.com PING github.com (140.82.112.4): 56 data bytes 64 bytes from 140.82.112.4: seq=0 ttl=53 time=6.902 ms --- github.com ping statistics --- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max = 6.902/6.902/6.902 ms I am also running Ubuntu 18.04.4 LTS, having upgraded all packages and installed all security upgrades just prior to following the Discourse upgrade sequence.

@gekkonen I got mine running again. As a workaround, to force the Internet to work from Docker, you can configure the docker0 network to use “promiscuous” mode: [root@forum /var/discourse]# ifconfig docker0 promisc You should then be able to use the launcher to rebuild the app, and the Discourse forum should work fine. The caveat is that you probably will have to issue the command again after each reboot. Let me know if it works for you. I still don’t know the root cause of the problem.

Yes, that seemed to get past the issue with the DNS for now. Thank you for the suggestion.

On CentOS8 this error is due to the RHEL7 docker rpms (there are no RHEL8 ones yet) not understanding the new nftables based firewall. One has to setup masquerading by hand for the docker0 interface https://serverfault.com/questions/987686/no-network-connectivity-to-from-docker-ce-container-on-centos-8

Could not resolve host: github.com for SamSaffron/pups.git

Product Support

sam (Sam Saffron) 13 באוגוסט,‏ 2015,‏ 7:14am 2

This is very likely the solution

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Failed to Bootstrap Ping is working to github Self-hosting	11	5463	4 בדצמבר,‏ 2020
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After upgrade, docker cannot communicate with the outside world Self-hosting	26	3932	1 בפברואר,‏ 2021
Discourse docker container has trouble reaching DNS Self-hosting	10	4590	30 באפריל,‏ 2018
Could not resolve host: github.com Product Support	2	402	25 בספטמבר,‏ 2025

Could not resolve host: github.com for SamSaffron/pups.git

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