docker虚拟网桥实现固定IP，容器互通，外网可用
提示：Docker不再兼容CentOS6，在使用docker的时候请将系统进行升级CentOS最低版本7.0 kernel最低3.10.0注意关闭SElinux和iptables等防火墙
一、更新阿里云CentOS源，安装Docker
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备份yum源
# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下载阿里云yum源
# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
更新缓存
# yum clean all && yum makecache
下载epel
# yum -y install epel-release
更新缓存
# yum clean all && yum makecache
安装docker
# yum -y install docker-io
启动docker服务
# systemctl start docker
测试docker状态
# docker info
参考 http://mirrors.aliyun.com/help/centos 参考 https://help.aliyun.com/document_detail/51853.html
二、下载centos镜像并启动，安装网络工具后重新进行封装为镜像2.1、下载centos镜像：
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# docker search centos
INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED
docker.io docker.io/centos The official build of CentOS. 3857
docker.io docker.io/ansible/centos7-ansible Ansible on Centos7 103
docker.io docker.io/jdeathe/centos-ssh CentOS-6 6.9 x86_64 / CentOS-7 7.4.1708 x8... 90
docker.io docker.io/consol/centos-xfce-vnc Centos container with "headless" VNC sessi... 35
docker.io docker.io/tutum/centos Simple CentOS docker image with SSH access 34
docker.io docker.io/imagine10255/centos6-lnmp-php56 centos6-lnmp-php56 33
...
# docker pull docker.io/centos
Using default tag: latest
Trying to pull repository docker.io/library/centos ...
latest: Pulling from docker.io/library/centos
85432449fd0f: Pull complete
Digest: sha256:3b1a65e9a05f0a77b5e8a698d3359459904c2a354dc3b25ae2e2f5c95f0b3667
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/centos latest 3fa822599e10 6 days ago 203.5 MB
2.2、进入容器安装网络工具：
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# docker run -itd --name=centos_net 3fa /bin/bash
c7bc119c8387e133b37aa5ff713074529b51f2d6303780310b6ba520eeef6a79
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c7bc119c8387 3fa "/bin/bash" 4 seconds ago Up 4 seconds centos_net
# docker attach c7b
# yum -y install net-tools iproute
...
等待yum安装完成（Ctrl + P + Q）快捷键回到宿主主机，容器后台继续运行
2.3、重新封装为镜像：
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# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c7bc119c8387 3fa "/bin/bash" 3 minutes ago Up 3 minutes centos_net
# docker commit c7b centos_net
sha256:7a04c40fc8f8a727d2d3467fc3a75d8a5c3639cf0ad27f35b53c0f67f3783afc
# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
centos_net latest 7a04c40fc8f8 10 seconds ago 288.6 MB
docker.io/centos latest 3fa822599e10 6 days ago 203.5 MB
# docker stop c7b && docker rm c7b
c7b
c7b
三、创建虚拟网桥并设置为默认网桥3.1、安装pipework
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# mkdir -p /home/pipework && cd /home/pipework
# yum -y install git
...
# git clone https://github.com/jpetazzo/pipework.git
Cloning into 'pipework'...
remote: Counting objects: 501, done.
remote: Total 501 (delta 0), reused 0 (delta 0), pack-reused 501
Receiving objects: 100% (501/501), 172.97 KiB | 0 bytes/s, done.
Resolving deltas: 100% (264/264), done.
# ls
pipework
# ls ./pipework/
docker-compose.ymldoctocLICENSEpipeworkpipework.specREADME.md
# cp -rp pipework/pipework /usr/local/bin/
参考 http://blog.csdn.net/xu470438000/article/details/50512442
3.2、创建虚拟网桥
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安装bridge管理工具
# yum -y install bridge-utils
停止docker服务
# systemctl stop docker
查看网卡状态
# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:16:3e:04:3b:69 brd ff:ff:ff:ff:ff:ff
inet 172.31.43.125/20 brd 172.31.47.255 scope global eth0
valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
link/ether 02:42:2f:aa:d4:c5 brd ff:ff:ff:ff:ff:ff
inet 172.17.0.1/16 scope global docker0
valid_lft forever preferred_lft forever
停止自带的docker0网桥
# ip link set dev docker0 down
删除该docker0网桥
# brctl delbr docker0
查看，已不存在了，删除成功
# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:16:3e:04:3b:69 brd ff:ff:ff:ff:ff:ff
inet 172.31.43.125/20 brd 172.31.47.255 scope global eth0
valid_lft forever preferred_lft forever
创建br0虚拟网桥
# brctl addbr br0
启动br0虚拟网桥
# ip link set dev br0 up
为该虚拟网桥设置ip和掩码
# ip addr add 192.168.1.1/24 dev br0
查看，设置成功
# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000
link/ether 00:16:3e:04:3b:69 brd ff:ff:ff:ff:ff:ff
inet 172.31.43.125/20 brd 172.31.47.255 scope global eth0
valid_lft forever preferred_lft forever
6: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN qlen 1000
link/ether 22:e9:84:47:82:c8 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.1/24 scope global br0
valid_lft forever preferred_lft forever
3.3、设置br为默认网桥
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# vi /etc/sysconfig/docker-network
# cat /etc/sysconfig/docker-network
# /etc/sysconfig/docker-network
DOCKER_NETWORK_OPTIONS="-b=br0"
启动docker服务
# systemctl start docker
四、启动容器并分配IP
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# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
centos_net latest 7a04c40fc8f8 2 hours ago 288.6 MB
docker.io/centos latest 3fa822599e10 6 days ago 203.5 MB
# docker run --name=centos --net=none -itd 3fa /bin/bash
7eb78b6b4e103f0f8b0ce70559b20925890ab8b2f2b30e2a848f45e21873c01e
# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7eb78b6b4e10 3fa "/bin/bash" 4 seconds ago Up 3 seconds centos
# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.000000000000 no
docker0 8000.0242b580373f no
# pipework br0 -i eth0 7eb 192.168.1.50/24@192.168.1.1
# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.12056d403390 no veth0pl15082
docker0 8000.0242b580373f no
# docker attach 7eb
# ping www.baidu.com
PING www.a.shifen.com (220.181.111.188) 56(84) bytes of data.
64 bytes from 220.181.111.188 (220.181.111.188): icmp_seq=1 ttl=50 time=17.4 ms
64 bytes from 220.181.111.188 (220.181.111.188): icmp_seq=2 ttl=50 time=17.4 ms
64 bytes from 220.181.111.188 (220.181.111.188): icmp_seq=3 ttl=50 time=17.4 ms
^C
--- www.a.shifen.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 17.440/17.462/17.481/0.016 ms
# 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=0.064 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=0.057 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=0.057 ms
^C
--- 192.168.1.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.057/0.059/0.064/0.007 ms
# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>mtu 1500
inet 192.168.1.50netmask 255.255.255.0broadcast 192.168.1.255
inet6 fe80::7c7c:4aff:fe15:e0dfprefixlen 64scopeid 0x20<link>
ether 7e:7c:4a:15:e0:dftxqueuelen 1000(Ethernet)
RX packets 2124bytes 10826617 (10.3 MiB)
RX errors 0dropped 0overruns 0frame 0
TX packets 1717bytes 116914 (114.1 KiB)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING>mtu 65536
inet 127.0.0.1netmask 255.0.0.0
inet6 ::1prefixlen 128scopeid 0x10<host>
looptxqueuelen 1(Local Loopback)
RX packets 0bytes 0 (0.0 B)
RX errors 0dropped 0overruns 0frame 0
TX packets 0bytes 0 (0.0 B)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
参考 http://blog.csdn.net/xu470438000/article/details/50512442
Thanks for sharing!!!!! 刚好可以去试一试。
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