为了使本地网络中的机器和Docker容器更方便的通信，我们经常会有将Docker容器配置到和主机同一网段的需求。这个需求其实很容易实现，我们只要将Docker容器和宿主机的网卡桥接起来，再给Docker容器配上IP就可以了。
Centos 6按照下面的方法操作（6与7的操作有所不同）
[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls
ifcfg-eth0 ifdown-ib ifdown-ppp ifup-aliases ifup-ipv6 ifup-ppp init.ipv6-global
ifcfg-lo ifdown-ippp ifdown-routes ifup-bnep ifup-isdn ifup-routes net.hotplug
ifdown ifdown-ipv6 ifdown-sit ifup-eth ifup-plip ifup-sit network-functions
ifdown-bnep ifdown-isdn ifdown-tunnel ifup-ib ifup-plusb ifup-tunnel network-functions-ipv6
ifdown-eth ifdown-post ifup ifup-ippp ifup-post ifup-wireless
[root@localhost network-scripts]# cp ifcfg-eth0 ifcfg-br0
[root@localhost network-scripts]# vi ifcfg-eth0
DEVICE=eth0
HWADDR=00:0C:29:DB:B2:28
TYPE=Ethernet
UUID=b2268aab-fa2e-49e9-bd67-2572f29e5790
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=static
IPADDR=192.168.1.179
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS1=114.114.114.114
DNS2=8.8.4.4
增加BRIDGE=br0，删除IPADDR、NETMASK、GATEWAY、DNS
DEVICE=eth0
HWADDR=00:0C:29:DB:B2:28
TYPE=Ethernet
UUID=b2268aab-fa2e-49e9-bd67-2572f29e5790
ONBOOT=yes
BRIDGE=br0
BOOTPROTO=none
#IPADDR=192.168.1.179
#NETMASK=255.255.255.0
#GATEWAY=192.168.1.1
#DNS1=114.114.114.114
#DNS2=8.8.4.4
保存退出
[root@localhost network-scripts]# vi ifcfg-br0
DEVICE=eth0
HWADDR=00:0C:29:DB:B2:28
TYPE=Ethernet
UUID=b2268aab-fa2e-49e9-bd67-2572f29e5790
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=static
IPADDR=192.168.1.179
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS1=114.114.114.114
DNS2=8.8.4.4
修改DEVICE为br0，Type为Bridge，把eth0的网络设置设置到这里来
DEVICE=br0
TYPE=Bridge
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.179
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
DNS1=114.114.114.114
DNS2=8.8.4.4
保存退出
[root@localhost network-scripts]# service network restart这一步我出现了问题，不过重启宿主机后就OK了。
[root@localhost ~]# ifconfig
br0 Link encap:Ethernet HWaddr 00:0C:29:DB:B2:28
inet addr:192.168.1.179 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fedb:b228/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:137 errors:0 dropped:0 overruns:0 frame:0
TX packets:93 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:13745 (13.4 KiB) TX bytes:11095 (10.8 KiB)
docker0 Link encap:Ethernet HWaddr C6:01:70:AF:C6:E4
inet addr:172.17.42.1 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::c401:70ff:feaf:c6e4/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:468 (468.0 b)
eth0 Link encap:Ethernet HWaddr 00:0C:29:DB:B2:28
inet6 addr: fe80::20c:29ff:fedb:b228/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:137 errors:0 dropped:0 overruns:0 frame:0
TX packets:101 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15663 (15.2 KiB) TX bytes:11959 (11.6 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:16 errors:0 dropped:0 overruns:0 frame:0
TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:960 (960.0 b) TX bytes:960 (960.0 b)
[root@localhost ~]# git
-bash: git: command not found
[root@localhost ~]# yum install -y git
[root@localhost ~]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# git clone https://github.com/jpetazzo/pipework
pipework是由Docker的工程师Jérôme Petazzoni开发的一个Docker网络配置工具
[root@localhost network-scripts]# ls
ifcfg-br0 ifdown-eth ifdown-post ifup ifup-ippp ifup-post ifup-wireless pipework
ifcfg-eth0 ifdown-ib ifdown-ppp ifup-aliases ifup-ipv6 ifup-ppp init.ipv6-global
ifcfg-lo ifdown-ippp ifdown-routes ifup-bnep ifup-isdn ifup-routes net.hotplug
ifdown ifdown-ipv6 ifdown-sit ifup-eth ifup-plip ifup-sit network-functions
ifdown-bnep ifdown-isdn ifdown-tunnel ifup-ib ifup-plusb ifup-tunnel network-functions-ipv6
[root@localhost network-scripts]# cp pipework/pipework /usr/local/bin/
[root@localhost network-scripts]# cd
[root@localhost ~]# docker run -itd --net=none --name docker_bridge centos_with_httpd:genesis bash
5417847d3edf9381acf4bcc94c5345002521f4500415d835f081b022f6d48723
[root@localhost ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5417847d3edf centos_with_httpd:genesis "bash" 8 seconds ago Up 6 seconds docker_bridge
[root@localhost ~]# docker exec -it docker_bridge bash
[root@5417847d3edf /]# ifconfig
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 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@5417847d3edf /]# exit
[root@localhost ~]# rpm -Uvh https://repos.fedorapeople.org/openstack/EOL/openstack-grizzly/epel-6/iproute-2.6.32-130.el6ost.netns.2.x86_64.rpm不升级会报错Object “netns” is unknown, try “ip help”
[root@localhost ~]# pipework br0 docker_bridge 192.168.1.187/24
[root@localhost ~]# docker exec -it docker_bridge bash
[root@5417847d3edf /]# ifconfig
eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.187 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::bcf2:9cff:fe1e:4796 prefixlen 64 scopeid 0x20<link>
ether be:f2:9c:1e:47:96 txqueuelen 1000 (Ethernet)
RX packets 7 bytes 528 (528.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7 bytes 510 (510.0 B)
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 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ping一下网关
[root@5417847d3edf /]# ping 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=63.1 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=2.12 ms
^C
--- 192.168.1.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 2.125/32.637/63.150/30.513 ms