2
2
For me,
docker run -it --rm --net=host debian ping -c3 heise.de
results in successful ping output, while
docker run -it --rm debian ping -c3 heise.de
simply hangs (no network). I use Docker 1.11 on Lubuntu 16.04 desktop. The computer was connected via USB/Wifi to the internet but now is connected via Ethernet. I tested the Docker from the official Ubuntu repository, and now use the latest release.
In both cases, docker0 does not seem to work. Inside the container, there is no working network. ifconfig says
docker0 Link encap:Ethernet HWaddr ***
inet addr:172.17.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::***/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:509 errors:0 dropped:0 overruns:0 frame:0
TX packets:48 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:35000 (35.0 KB) TX bytes:4358 (4.3 KB)
enp0s18 Link encap:Ethernet HWaddr ***
inet addr:***.122.165 Bcast:***.122.255 Mask:255.255.255.0
inet6 addr: fe80::***/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:255294810 errors:0 dropped:48 overruns:0 frame:0
TX packets:2140765 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:31017941143 (31.0 GB) TX bytes:378556157 (378.5 MB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:1181928 errors:0 dropped:0 overruns:0 frame:0
TX packets:1181928 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1
RX bytes:1745784400 (1.7 GB) TX bytes:1745784400 (1.7 GB)
How can I go from here? Where can one look at next?
Torsten Bronger
Posted 2016-05-17T13:00:54.760
Reputation: 358
I don't know if we're experiencing quite the same problem, but for me it hangs on TCP but not PING (UDP). Your command works for me but this hangs: sudo docker run -it --rm busybox telnet heise.de 80 My question is essentially the same as yours; how to debug this? – David Smiley – 2016-09-17T13:35:19.447