一切都运行正常，然后突然出现这种情况。网络第一次工作正常，但随后停止，除非我重新启动 docker 服务。
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:~$
运行时不会发生问题--network=host option。
Linux 版本：
Linux debian 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3+deb9u1 (2017-12-23) x86_64 GNU/Linux
测试的 Docker 版本：
17.12.0-ce, build c97c6d6
18.03.1-ce, build 9ee9f40
我注意到，当它工作和不工作时，traceroute 的输出有所不同。工作时：
/ # 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
不工作：
/ # 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
/ #
看来导致它不起作用的原因是主机中缺少docker0路由。当我重新启动docker服务时，最后一行被重新创建：
$ 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
答案1
wcid 服务似乎确实是原因。我在配置中发现：
（/etc/wicd/manager-settings.conf）：wired_interface = docker0
我将其更改为 eth0
在 Stackoverflow 上找到了这个解决方案。