为Docker容器设置固定IP实现网络联通(2)——通过Python脚本实现并解决pipework缺陷
题记
前面已经提到通过使用pipework方式，为容器设置固定IP，但是该方法有一个问题就是如果我们的容器实例重启，设置的固定IP会丢失，这显然回事一件令人头疼的事情，如果我们重启后IP依然保持设置的，岂不是一件很好的事情，接下来我们就介绍一下如何完成这个需求。
通过这个图可以看到，与上一篇使用pipework架构基本类似，本次只是用了一个网卡，而且我只创建了一个容器实例C1，相关环境可以参考上一篇介绍。
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1、为容器服务器设置br0网桥，该网桥写入到配置文件里面，dns-nameservers如果需求可以添加
root@controller:~# cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
#auto eth0
#iface eth0 inet static
# address 10.0.0.11
# netmask 255.255.255.0
auto br0
iface br0 inet static
address 192.168.14.225
netmask 255.255.255.0
gateway 192.168.14.254
bridge_ports eth0
bridge_stp off
2、安装相应的包文件
#安装pip
apt-get install python-pip python-dev build-essential
#安装docker python的api
pip install docker-py 3、启动一个容器实例
root@controller:~# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
root@controller:~# docker run -i -t --name test1 --net=none ubuntu:14.04 /bin/bash
root@443b6fa7416a:/#
root@443b6fa7416a:/# ip a
1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default
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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
4、下载相关文件（docker-static-ip-master.zip）
解压之后，进入该文件夹，该文件夹其实就是通过python脚本实现了设置固定IP的步骤。
我们需要修改相关的配置文件，添加需要设置的容器实例信息
root@controller:~# cd docker-static-ip-master/
root@controller:~/docker-static-ip-master# ls
containers.cfg duration.py README.md
root@controller:~/docker-static-ip-master# cat containers.cfg
#,,,
root@controller:~/docker-static-ip-master# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
443b6fa7416a ubuntu:14.04 "/bin/bash" 3 minutes ago Exited (0) 3 minutes ago test1
root@controller:~/docker-static-ip-master#
root@controller:~/docker-static-ip-master# echo "443b6fa7416a,br0,192.168.14.243/24,192.168.14.254" >> containers.cfg
root@controller:~/docker-static-ip-master# python duration.py
5、查看信息（在容器实例）
root@443b6fa7416a:/# ip a
1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default
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
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
7: eth0: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 3a:9d:3b:13:89:db brd ff:ff:ff:ff:ff:ff
inet 192.168.14.243/24 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::389d:3bff:fe13:89db/64 scope link
valid_lft forever preferred_lft forever
在容器实例测试连接
root@443b6fa7416a:/# ping 192.168.14.254
PING 192.168.14.254 (192.168.14.254) 56(84) bytes of data.
64 bytes from 192.168.14.254: icmp_seq=1 ttl=255 time=22.5 ms
64 bytes from 192.168.14.254: icmp_seq=2 ttl=254 time=2.00 ms
^C
--- 192.168.14.254 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 2.005/12.282/22.559/10.277 ms
root@443b6fa7416a:/# ping 192.168.14.225
PING 192.168.14.225 (192.168.14.225) 56(84) bytes of data.
64 bytes from 192.168.14.225: icmp_seq=1 ttl=64 time=0.127 ms
64 bytes from 192.168.14.225: icmp_seq=2 ttl=64 time=0.104 ms
^C
--- 192.168.14.225 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.104/0.115/0.127/0.015 ms
在宿主机查看信息
root@controller:~# ifconfig br0
br0 Link encap:Ethernet HWaddr 00:0c:29:d3:5a:fe
inet addr:192.168.14.225 Bcast:192.168.14.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fed3:5afe/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7139 errors:0 dropped:0 overruns:0 frame:0
TX packets:976 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:552522 (552.5 KB) TX bytes:123821 (123.8 KB)
root@controller:~# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.000c29d35afe no eth0
tap1923
docker0 8000.02427810a053 no
root@controller:~# ping 192.168.14.243
PING 192.168.14.243 (192.168.14.243) 56(84) bytes of data.
64 bytes from 192.168.14.243: icmp_seq=1 ttl=64 time=0.033 ms
64 bytes from 192.168.14.243: icmp_seq=2 ttl=64 time=0.065 ms
64 bytes from 192.168.14.243: icmp_seq=3 ttl=64 time=0.100 ms
^C
--- 192.168.14.243 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.033/0.066/0.100/0.027 ms
在我的笔记本测试连接
C:\Users\Administrator>ping 192.168.14.243
正在 Ping 192.168.14.243 具有 32 字节的数据:
来自 192.168.14.243 的回复: 字节=32 时间<1ms TTL=64
来自 192.168.14.243 的回复: 字节=32 时间<1ms TTL=64
来自 192.168.14.243 的回复: 字节=32 时间<1ms TTL=64
来自 192.168.14.243 的回复: 字节=32 时间<1ms TTL=64
192.168.14.243 的 Ping 统计信息:
数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)，
往返行程的估计时间(以毫秒为单位):
最短 = 0ms，最长 = 0ms，平均 = 0ms6、重启容器实例，测试IP
root@443b6fa7416a:/# exitroot@controller:~#
root@controller:~# docker stop 443b6fa7416a
443b6fa7416a
root@controller:~# docker start 443b6fa7416a
443b6fa7416a
root@controller:~# docker exec -it 443b6fa7416a /bin/bash
root@443b6fa7416a:/# ifconfig
eth0 Link encap:Ethernet HWaddr 4e:ef:ea:8d:0a:30
inet addr:192.168.14.243 Bcast:0.0.0.0 Mask:255.255.255.0
inet6 addr: fe80::4cef:eaff:fe8d:a30/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:30 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2364 (2.3 KB) TX bytes:578 (578.0 B)
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)
root@443b6fa7416a:/# ping 192.168.14.225
PING 192.168.14.225 (192.168.14.225) 56(84) bytes of data.
64 bytes from 192.168.14.225: icmp_seq=1 ttl=64 time=0.160 ms
64 bytes from 192.168.14.225: icmp_seq=2 ttl=64 time=0.113 ms
64 bytes from 192.168.14.225: icmp_seq=3 ttl=64 time=0.113 ms
^C
--- 192.168.14.225 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.113/0.128/0.160/0.025 ms
root@443b6fa7416a:/#
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Blog: http://blog.csdn.net/chinagissoft
QQ群：16403743
宗旨：专注于"GIS+"前沿技术的研究与交流，将云计算技术、大数据技术、容器技术、物联网与GIS进行深度融合，探讨"GIS+"技术和行业解决方案
转载说明：文章允许转载，但必须以链接方式注明源地址，否则追究法律责任!
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