Docker设置静态IP
创建docker容器docker run -it --name=yh -h yh --net=none debian:sshd bash ### 确保使用--net=none参数，此时新建的容器内不会创建网卡
docker ps
此时登录容器查看IP，会发现没有eth0网卡：
root@yh:/# ifconfig -a
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric: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)
CentOS6.6升级iproute
为了支持ip netns命令，需要对CentOS6.6进行升级：
rpm -ivh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-lt -y
vi /etc/grub.conf ## 修改default=0，默认启动新内核
reboot
uname -r
yum install -y http://rdo.fedorapeople.org/rdo-release.rpm### 更新rdo仓库
vim /etc/yum.repos.d/rdo-release.repo### 修改文件内容为如下
name=OpenStack Juno Repository
baseurl=http://repos.fedorapeople.org/repos/openstack/openstack-icehouse/epel-6/
enabled=1
skip_if_unavailable=0
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-RDO-Juno yum --enablerepo=openstack-juno install iproute ### 更新iproute
rpm -q iproute
设置静态IP
modify_docker_ip.sh：
#/bin/bash
if [ -z $1 ] || [ -z $2 ] || [ -z $3 ] || [ -z $4 ] || [ -z $5 ];
then
echo "Usage: $0 CONTAINERID IP MASK GATEWAY ETHNAME"
echo " Call the script like: sh manual_con_static_ip.shb0e18b6a4432 192.168.5.123 24 192.168.5.1 deth0"
exit
fi
CONTAINERID=$1
SETIP=$2
SETMASK=$3
GATEWAY=$4
ETHNAME=$5
#判断宿主机网卡是否存在
ifconfig $ETHNAME > /dev/null 2>&1
if [ $? -eq 0 ]; then
read -p "$ETHNAME exist,do you want delelte it? y/n " del
if [[ $del == 'y' ]]; then
ip link del $ETHNAME
else
exit
fi
fi
#
pid=`docker inspect -f '``.`State`.`Pid`' $CONTAINERID`
echo pid=$pid
mkdir -p /var/run/netns
find -L /var/run/netns -type l -delete
if [ -f /var/run/netns/$pid ]; then
rm -f /var/run/netns/$pid
fi
ln -s /proc/$pid/ns/net /var/run/netns/$pid
#
ip link add $ETHNAME type veth peer name B
brctl addif docker0 $ETHNAME
ip link set $ETHNAME up
ip link set B netns $pid
#先删除容器内已存在的eth0
ip netns exec $pid ip link del eth0 > /dev/null 2>&1
#设置容器新的网卡eth0
ip netns exec $pid ip link set dev B name eth0
ip netns exec $pid ip link set eth0 up
ip netns exec $pid ip addr add $SETIP/$SETMASK dev eth0
ip netns exec $pid ip route add default via $GATEWAY
执行如下命令为容器创建网卡，并分配静态IP：
./modify_docker_ip.sh 8feff00a0a26 172.17.0.2 16 172.17.42.1 deth0
其中：8feff00a0a26 是容器ID，172.17.0.2是容器的静态IP，16是掩码，172.17.42.1是容器的网关地址（即运行容器的系统中docker0的IP），deth0为新建的宿主机网卡名（对应容器内的eth0）
此时查看宿主机IP：
# ifconfig
deth0 Link encap:EthernetHWaddr DA:19:96:9B:1B:E5
inet6 addr: fe80::d819:96ff:fe9b:1be5/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:468 (468.0 b)TX bytes:468 (468.0 b)
docker0 Link encap:EthernetHWaddr 56:84:7A:FE:97:99
inet addr:172.17.42.1Bcast:0.0.0.0Mask:255.255.0.0
inet6 addr: fe80::5484:7aff:fefe:9799/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:12 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:768 (768.0 b)TX bytes:468 (468.0 b)
在容器内查看IP：
root@yh:/# ifconfig -a
eth0 Link encap:EthernetHWaddr 22:e1:72:17:b6:dd
inet addr:172.17.0.2Bcast:0.0.0.0Mask:255.255.0.0
inet6 addr: fe80::20e1:72ff:fe17:b6dd/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:3 errors:0 dropped:0 overruns:0 frame:0
TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:238 (238.0 B)TX bytes:238 (238.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNINGMTU:65536Metric: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)
附录
Docker关于网络这块的文档详见：https://docs.docker.com/articles/networking/
另外一个工具pipework也可以设置静态IP：https://github.com/jpetazzo/pipework
遗留问题
问题：docker容器重启之后，eth0消失，IP失效。
描述：docker文档中描述：容器stop的时候，docker自动清理网卡配置，所以重启之后容器内的eth0消失，静态IP也就失效了。
解决方法：1. run一个docker容器之后，再次执行文中的脚本或者pipework重新设置IP即可。 2. 可能还有更好的办法，待研究。
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