Docker高级应用之多台主机网络互联

目前docker主要应用于单机环境，使用网桥模式，但如果想把多台主机网络互相，让多台主机内部的container互相通信，就得使用其他的软件来帮忙，可以使用Weave、Kubernetes、Flannel、SocketPlane或者openvswitch等，我这里就使用openvswitch来介绍docker多台主机网络互通。

先看一个使用openvswitch连接的架构图，连接的方式是vxlan

环境

一、安装openvswitch
我的版本是最新的2.3.1
1、安装基础环境

   yum install gcc make python-devel openssl-devel kernel-devel graphviz \
  kernel-debug-devel autoconf automake rpm-build RedHat-rpm-config \
  libtool

2、下载最新的包
 wget http://openvswitch.org/releases/openvswitch-2.3.1.tar.gz

3、解压与打包
tar zxvf openvswitch-2.3.1.tar.gz
mkdir -p ~/rpmbuild/SOURCES
cp openvswitch-2.3.1.tar.gz ~/rpmbuild/SOURCES/
sed 's/openvswitch-kmod, //g' openvswitch-2.3.1/rhel/openvswitch.spec > openvswitch-2.3.1/rhel/openvswitch_no_kmod.spec
rpmbuild -bb --without check openvswitch-2.3.1/rhel/openvswitch_no_kmod.spec

之后会在~/rpmbuild/RPMS/x86_64/里有2个文件
total 9500
-rw-rw-r-- 1 ovswitch ovswitch 2013688 Jan 15 03:20 openvswitch-2.3.1-1.x86_64.rpm
-rw-rw-r-- 1 ovswitch ovswitch 7712168 Jan 15 03:20 openvswitch-debuginfo-2.3.1-1.x86_64.rpm

安装第一个就行
4、安装
yum localinstall ~/rpmbuild/RPMS/x86_64/openvswitch-2.3.1-1.x86_64.rpm

5、启动
systemctl start openvswitch

6、查看状态
[root@docker-test3 tmp]# systemctl status openvswitch
openvswitch.service - LSB: Open vSwitch switch
  Loaded: loaded (/etc/rc.d/init.d/openvswitch)
  Active: active (running) since Wed 2015-01-28 23:34:01 CST; 6 days ago
  CGroup: /system.slice/openvswitch.service
          ├─20314 ovsdb-server: monitoring pid 20315 (healthy)
          ├─20315 ovsdb-server /etc/openvswitch/conf.db -vconsole:emer -vsyslog:err -vfile:info --remote=punix:/var/run/openvswitch/db.sock --private-key=db:Open_vSwitch,SSL,p...
          ├─20324 ovs-vswitchd: monitoring pid 20325 (healthy)
          └─20325 ovs-vswitchd unix:/var/run/openvswitch/db.sock -vconsole:emer -vsyslog:err -vfile:info --mlockall --no-chdir --log-file=/var/log/openvswitch/ovs-vswitchd.log...
 
Jan 28 23:34:01 ip-10-10-17-3 openvswitch[20291]: /etc/openvswitch/conf.db does not exist ... (warning).
Jan 28 23:34:01 ip-10-10-17-3 openvswitch[20291]: Creating empty database /etc/openvswitch/conf.db [  OK  ]
Jan 28 23:34:01 ip-10-10-17-3 openvswitch[20291]: Starting ovsdb-server [  OK  ]
Jan 28 23:34:01 ip-10-10-17-3 ovs-vsctl[20316]: ovs|00001|vsctl|INFO|Called as ovs-vsctl --no-wait -- init -- set Open_vSwitch . db-version=7.6.2
Jan 28 23:34:01 ip-10-10-17-3 ovs-vsctl[20321]: ovs|00001|vsctl|INFO|Called as ovs-vsctl --no-wait set Open_vSwitch . ovs-version=2.3.1 "external-ids:system-id=\"6ea..."unknown\""
Jan 28 23:34:01 ip-10-10-17-3 openvswitch[20291]: Configuring Open vSwitch system IDs [  OK  ]
Jan 28 23:34:01 ip-10-10-17-3 openvswitch[20291]: Starting ovs-vswitchd [  OK  ]
Jan 28 23:34:01 ip-10-10-17-3 openvswitch[20291]: Enabling remote OVSDB managers [  OK  ]
Jan 28 23:34:01 ip-10-10-17-3 systemd[1]: Started LSB: Open vSwitch switch.
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