fix-docker-networking-dns

[giscus[bot]]

fix-docker-networking-dns

Within certain networks, docker is unable to resolve DNS correctly. When this happens, here's how to fix it.

https://robinwinslow.uk/fix-docker-networking-dns

[pocketry]

I spent the last 1.5 hours trying to learn docker and getting stuck on the first docker run command because of this issue. Your solution fixed it. How can I buy you a cup of coffee? Thank you.

[pocketry]

by docker run, I mean docker build.

[nottrobin]

Thanks! I'm so glad this is still helping people, and amazed that Docker haven't fixed this yet. It's been years!

I'm very touched by the offer to buy me a coffee. I'm not sure I really need it though - if you'd like to donate something, could I suggest you give to one of these organisations instead? Or any other charity you'd like.

https://www.givedirectly.org/
https://www.dec.org.uk/
https://www.msf.org/
https://www.pcrf.net/

[leandervaneekelen]

Hi there @NotRobin! Thanks for the awesome blogpost. Unfortunately for me, the DNS doesn't seem to be the problem as your first smoke test immediately fails:

# on vpn
$ docker run busybox ping -c 1 192.203.230.10
PING 192.203.230.10 (192.203.230.10): 56 data bytes

--- 192.203.230.10 ping statistics ---
1 packets transmitted, 0 packets received, 100% packet loss

# off vpn
$ docker run busybox ping -c 1 192.203.230.10
PING 192.203.230.10 (192.203.230.10): 56 data bytes
64 bytes from 192.203.230.10: seq=0 ttl=58 time=8.246 ms

--- 192.203.230.10 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 8.246/8.246/8.246 ms

Could you recommend any other blog posts/guides/approaches?