docker overlay 网关路由

宿主机
#ifconfig

//docker 默认分配
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0
        inet6 fe80::42:40ff:fe28:8f83  prefixlen 64  scopeid 0x20<link>
        ether 02:42:40:28:8f:83  txqueuelen 0  (Ethernet)
        RX packets 736  bytes 57444 (56.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 711  bytes 96398 (94.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

//docker overlay 
docker_gwbridge: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.18.0.1  netmask 255.255.0.0  broadcast 0.0.0.0
        inet6 fe80::42:5cff:fedd:deea  prefixlen 64  scopeid 0x20<link>
        ether 02:42:5c:dd:de:ea  txqueuelen 0  (Ethernet)
        RX packets 1054  bytes 367783 (359.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1054  bytes 367783 (359.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
//本地		
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.26.11.221  netmask 255.255.255.0  broadcast 172.26.11.255
        inet6 fe80::250:56ff:feae:5cc4  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:ae:5c:c4  txqueuelen 1000  (Ethernet)
        RX packets 1480090  bytes 1890922152 (1.7 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 657568  bytes 54366452 (51.8 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 1054  bytes 367783 (359.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1054  bytes 367783 (359.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

veth84b93c8: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::94d4:3aff:feef:b633  prefixlen 64  scopeid 0x20<link>
        ether 96:d4:3a:ef:b6:33  txqueuelen 0  (Ethernet)
        RX packets 37  bytes 3165 (3.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 44  bytes 3230 (3.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

vethed0f348: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::9437:6fff:fefb:a487  prefixlen 64  scopeid 0x20<link>
        ether 96:37:6f:fb:a4:87  txqueuelen 0  (Ethernet)
        RX packets 21  bytes 1482 (1.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 82  bytes 6716 (6.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0


docker 容器：

#ifconfig

//docker overlay 
eth0      Link encap:Ethernet  HWaddr 02:42:0A:00:00:05  
          inet addr:10.0.0.5  Bcast:0.0.0.0  Mask:255.255.255.0
          inet6 addr: fe80::42:aff:fe00:5/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1450  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:648 (648.0 b)  TX bytes:648 (648.0 b)
//docker 默认分配
eth1      Link encap:Ethernet  HWaddr 02:42:AC:12:00:03  
          inet addr:172.18.0.3  Bcast:0.0.0.0  Mask:255.255.0.0
          inet6 addr: fe80::42:acff:fe12:3/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:22 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1622 (1.5 KiB)  TX bytes:1609 (1.5 KiB)

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)


//docker容器		  
#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.18.0.1      0.0.0.0         UG    0      0        0 eth1
10.0.0.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
172.18.0.0      0.0.0.0         255.255.0.0     U     0      0        0 eth1

10.0.0.0,172.18.0.0  都走网关 172.18.0.1 （docker_gwbridge）  //docker overlay 


//宿主机
#route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.26.11.254   0.0.0.0         UG    100    0        0 eth0
172.17.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker0
172.18.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker_gwbridge
172.26.11.0     0.0.0.0         255.255.255.0   U     100    0        0 eth0


172.17.0.0 ，172.18.0.0 ，172.26.11.0 (docker0,docker_gwbridge,eth0 都走网关172.26.11.254)