docker 指定IP地址、与主机同网段IP

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)

然后对container内部新添加的网卡进行配置（可以通过man ip-netns更详细查看）

[yaxin@cube2x ~]$sudo ip netns exec 23090 ip link set dev X name eth0
[yaxin@cube2x ~]$sudo ip netns exec 23090 ip link set eth0 up
[yaxin@cube2x ~]$sudo ip netns exec 23090 ip addr add 172.17.111.10/16 dev eth0
[yaxin@cube2x ~]$sudo ip netns exec 23090 ip route add default via 172.17.42.1

注意: 指定给container的IP必须跟docker0在同一网段,且给container的网关应该为docker0的IP

最后，写成shell脚本如下:

#!/usr/bin/env bash# filename: bind_addr.sh
if [ `id -u` -ne 0 ];then
  echo '必须使用root权限'
  exitfi
if [ $# != 2 ]; then
  echo "使用方法: $0 容器名字 IP"
  exit 1fi
container_name=$1bind_ip=$2
container_id=`docker inspect -f '{{.Id}}' $container_name 2> /dev/null`
if [ ! $container_id ];then
  echo "容器不存在"
  exit 2fibind_ip=`echo $bind_ip | egrep '^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'`
if [ ! $bind_ip ];then
  echo "IP地址格式不正确"
  exit 3fi
container_minid=`echo $container_id | cut -c 1-10`
container_netmask=`ip addr show docker0 | grep "inetb" | awk '{print $2}' | cut -d / -f2`
container_gw=`ip addr show docker0 | grep "inetb" | awk '{print $2}' | cut -d / -f1`
bridge_name="veth_$container_minid"
container_ip=$bind_ip/$container_netmask
pid=`docker inspect -f '{{.State.Pid}}' $container_name 2> /dev/null`
if [ ! $pid ];then
  echo "获取容器$container_name的id失败"
  exit 4fi
if [ ! -d /var/run/netns ];then
  mkdir -p /var/run/netns
fi
ln -sf /proc/$pid/ns/net /var/run/netns/$pid
ip link add $bridge_name type veth peer name X
brctl addif docker0 $bridge_name
ip link set $bridge_name up
ip link set X netns $pid
ip netns exec $pid ip link set dev X name eth0
ip netns exec $pid ip link set eth0 up
ip netns exec $pid ip addr add $container_ip dev eth0
ip netns exec $pid ip route add default via $container_gw
运行并写入ip和容器名称
配置容器与主机IP同一网段
先配置主机br0
vi /etc/sysconfig/network-scripts/ifcfg-br0
DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
ONBOOT=yes
DELAY=0
STP=yes
IPADDR=192.168.2.111
NETMASK=255.255.255.0
GATEWAY=192.168.2.1
/etc/init.d/network restart
docker run -itd --name test centos /bin/bash								 
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