Debugging Kubernetes network

docker.service

# /etc/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=docker.socket early-docker.target network.target setup-network-environment.service
Requires=docker.socket early-docker.target setup-network-environment.service

[Service]
Environment=TMPDIR=/var/tmp
MountFlags=slave
LimitNOFILE=1048576
LimitNPROC=1048576
ExecStart=/usr/lib/coreos/dockerd --daemon --host=fd:// --bridge=cbr0 --iptables=false --ip-masq=false

[Install]
WantedBy=multi-user.target

gistfile1.txt

core@pc-10368 ~ $ docker exec -ti 3b6 /bin/bash
root@test-0ocfk:/# ping -c 1 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
ping: sending packet: Network is unreachable
root@test-0ocfk:/# ping -c 1 192.168.1.6
PING 192.168.1.6 (192.168.1.6): 56 data bytes
ping: sending packet: Network is unreachable
root@test-0ocfk:/# ping -c 1 www.google.com
ping: unknown host
root@test-0ocfk:/# ifconfig
bash: ifconfig: command not found
root@test-0ocfk:/# exit
core@pc-10368 ~ $

gistfile2.txt

core@pc-10368 ~ $ ifconfig cbr0
cbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.1  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::d8c5:1fff:fe59:42ff  prefixlen 64  scopeid 0x20<link>
        ether da:c5:1f:59:42:ff  txqueuelen 0  (Ethernet)
        RX packets 71  bytes 5132 (5.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 326  bytes 17297 (16.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Manually started container

core@pc-10368 ~ $ docker run -ti ubuntu
root@5159bdfd3d36:/# ping -c 1 192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=0.053 ms

--- 192.168.1.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.053/0.053/0.053/0.000 ms
root@5159bdfd3d36:/# ifconfig
eth0      Link encap:Ethernet  HWaddr 02:42:c0:a8:01:08  
          inet addr:192.168.1.8  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::42:c0ff:fea8:108/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:27 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2300 (2.3 KB)  TX bytes:898 (898.0 B)

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:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root@5159bdfd3d36:/# ping -c 1 www.google.com
PING www.google.com (173.194.40.82) 56(84) bytes of data.
64 bytes from zrh04s06-in-f18.1e100.net (173.194.40.82): icmp_seq=1 ttl=52 time=1.09 ms

--- www.google.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.098/1.098/1.098/0.000 ms
root@5159bdfd3d36:/#