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Eduardo
Asked: 2018-06-26 05:15:23 +0800 CST

Docker network hangs and need to restart daemon

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Everything was working fine then suddenly I'm getting this behavior. Network works the first time but then stops unless I restart docker service.

eduardo@debian:~$ docker run -it --rm busybox
/ # ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=54 time=32.611 ms
64 bytes from 8.8.8.8: seq=1 ttl=54 time=16.220 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 16.220/24.415/32.611 ms
/ # eduardo@debian:~$ docker run -it --rm busybox
/ # ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
^C
--- 8.8.8.8 ping statistics ---
6 packets transmitted, 0 packets received, 100% packet loss
/ # exit
eduardo@debian:~$ sudo service docker restart
eduardo@debian:~$ docker run -it --rm busybox
/ # ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=54 time=12.769 ms
64 bytes from 8.8.8.8: seq=1 ttl=54 time=13.807 ms
^C
--- 8.8.8.8 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 12.769/13.288/13.807 ms
/ # exit
eduardo@debian:~$ docker run -it --rm busybox
/ # ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
^C
--- 8.8.8.8 ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss
/ # eduardo@debian:~$

Problem does not happen when running with --network=host option.

Linux version:

Linux debian 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3+deb9u1 (2017-12-23) x86_64 GNU/Linux

Docker versions tested:

17.12.0-ce, build c97c6d6
18.03.1-ce, build 9ee9f40

I noticed different traceroute outputs when it is working and when it is not. Working:

/ # traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 46 byte packets
 1  172.17.0.1 (172.17.0.1)  0.003 ms  0.004 ms  0.001 ms
 2  10.0.2.2 (10.0.2.2)  0.268 ms  0.212 ms  0.167 ms
 3  *  *  *
 4  *  *  *
 5^C

Not Working:

/ # traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 46 byte packets
 1  f9ac28e9e4db (172.17.0.2)  3065.434 ms !H  3090.835 ms !H  3075.977 ms !H
/ #

It seems that what causes it to not work is the lack of the docker0 route in the host. When I restart docker service the last line is recreated:

$ ip route
default via 10.0.2.2 dev enp0s3 
10.0.2.0/24 dev enp0s3 proto kernel scope link src 10.0.2.15 
169.254.0.0/16 dev enp0s3 scope link metric 1000 
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown
networking

1 Answers

  1. Best Answer

    The wcid service seems to be the cause indeed. I found in the config :

    (/etc/wicd/manager-settings.conf): wired_interface = docker0

    I changed this to eth0

    Found this solution at Stackoverflow.

    https://stackoverflow.com/a/39448733/129960

    • 0