docker 容器固定ip
参考文档：http://blog.csdn.net/tzm1921995/article/details/52526661
实验环境：
OS: ubuntu server 14.04
docker version: 1.12.1
Host ip: 192.168.5.158
Host2 ip: 192.168.5.47
(安装最新版docker ,参照：https://docs.docker.com/engine/installation/linux/ubuntulinux/ )
本方法是使用network plugin创建一个新的bridge，然后即可通过–ip 选项自定ip，实现docker 容器固定ip
一，创建br1
# sudo docker network create -d bridge --subnet=192.168.210.0/24 --gateway=192.168.210.1 -o parent=eth0 br122dda6f921c9f9d539a9141777c64a4e36e967e665dd65c29fc194d1e6e1f99a （运行后返回值）12
注：创建br1并定义ip为192.168.210.1，通过eth0连接外网，创建成功后可通过docker network ls查看
~$ sudo docker network ls
NETWORK ID NAME DRIVER SCOPE22dda6f921c9 br1 bridge local 55032d510854 bridge bridge local 34de6823d6cd host host local 47efbf102360 none null local123456
可看到多出一个br1的网络
二，创建容器
# sudo docker run -it -d --net=br1 --ip=192.168.210.3 --name=nginx2 nginx:1.10-alpine16164727756c606f37109b75f02c3c17b992d3de7f5a6d247f6b20687fb90120# ping 192.168.210.3PING 192.168.210.3 (192.168.210.3) 56(84) bytes of data.64 bytes from 192.168.210.3: icmp_seq=1 ttl=64 time=0.175 ms64 bytes from 192.168.210.3: icmp_seq=2 ttl=64 time=0.085 ms# sudo docker exec -it nginx2 sh/ # ifconfigeth0 Link encap:Ethernet HWaddr 02:42:C0:A8:D2:03
inet addr:192.168.210.3 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::42:c0ff:fea8:d203%32596/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:20 errors:0 dropped:0 overruns:0 frame:0
TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1576 (1.5 KiB) TX bytes:928 (928.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1%32596/128 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)
/ # ping www.baidu.comPING www.baidu.com (115.239.210.27): 56 data bytes64 bytes from 115.239.210.27: seq=0 ttl=55 time=2.574 ms12345678910111213141516171819202122232425262728
网络连接正常，ip地址为192.168.210.3，主机可直连192.168.210.3
三，设置路由
这时在其它主机上是无法直接访问容器ip的，我们要访问容器提供的服务只能通过docker主机端口映射才行，这样很不方便。在其他主机上设置路由就可以直接访问到容器地址，或者在主机所在的网关上设置路由就更完美了，这里只在其他主机上设置路由：
host2:
# ping 192.168.210.3
PING 192.168.210.3 (192.168.210.3) 56(84) bytes of data.
^C
--- 192.168.210.3 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3023ms
# ip route replace 192.168.210.0/24 via 192.168.5.158 dev eth0 src 192.168.5.47
# ping 192.168.210.3
PING 192.168.210.3 (192.168.210.3) 56(84) bytes of data.
64 bytes from 192.168.210.3: icmp_seq=1 ttl=63 time=0.583 ms
64 bytes from 192.168.210.3: icmp_seq=2 ttl=63 time=0.736 ms
# curl http://192.168.210.3
<!DOCTYPE html><html><head><title>Welcome to nginx!</title><style>
body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; }</style></head><body><h1>Welcome to nginx!</h1><p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p><p>For online documentation and support please refer to<a href="http://nginx.org/">nginx.org</a>.<br/>Commercial support is available at<a href="http://nginx.com/">nginx.com</a>.</p><p><em>Thank you for using nginx.</em></p></body></html>123456789101112131415161718192021222324252627282930313233343536host2已经可以直连192.168.210.3了，并且可直接访问容器提供的服务
除了可以创建bridge network之外还可创建 overlay network or MACVLAN network，详细配置请参照：
https://docs.docker.com/engine/userguide/networking/
