docker虚拟网桥
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
docker 默认的桥接网卡是docker0
它只会在本机桥接所有的容器网卡，举例来说容器的虚拟网卡在主机上看一般叫做veth***而docker只是把所有这些网卡桥接在一起，如veth2a4c51b：
docker服务进程在启动的时候会生成一个名为docker0的网桥，容器默认都会挂载到该网桥下，但是我们可以通过添加docker启动参数-b Birdge 或更改docker配置文件来选择使用哪个网桥。
一、更新阿里云CentOS源，安装Docker
#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 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：
# docker search centos
INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED
docker.io docker.io/centos The official build of CentOS. 3857
......
# docker pull docker.io/centos
......
# 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：
# docker run -itd --name=centos_net 3fa /bin/bash
c7bc119c8387e133b37aa5ff713074529b51f2d6303780310b6ba520eeef6a79
# docker ps -a
CONTAINER IDIMAGE 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：
# 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/centoslatest 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
# 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
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: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: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: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: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: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: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: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: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
# 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
# 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=4163mtu 1500
inet 192.168.1.50netmask 255.255.255.0broadcast 192.168.1.255
inet6 fe80::7c7c:4aff:fe15:e0dfprefixlen 64scopeid 0x20
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=73mtu 65536
inet 127.0.0.1netmask 255.0.0.0
inet6 ::1prefixlen 128scopeid 0x10
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 # docker version #docker的版本
Client:
Version: 1.12.6
API version: 1.24
Package version: docker-1.12.6-61.git85d7426.el7.centos.x86_64
Go version: go1.8.3
Git commit: 85d7426/1.12.6
Built: Tue Oct 24 15:40:21 2017
OS/Arch: linux/amd64
Server:
Version: 1.12.6
API version: 1.24
Package version: docker-1.12.6-61.git85d7426.el7.centos.x86_64
Go version: go1.8.3
Git commit: 85d7426/1.12.6
Built: Tue Oct 24 15:40:21 2017
OS/Arch: linux/amd64
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