虚拟化网络工具：

创建物理桥：1 virsh命令virsh iface-bridge eth0 br02 /etc/sysconfig/network-scripts/编辑配置文件方式：[root@www08:26:15network-scripts]#cat ifcfg-eth0 DEVICE=eth0#IPADDR=172.20.23.30#NETMASK=255.255.0.0#GATEWAY=172.20.0.1#DNS1=114.114.114.114#DNS2=8.8.8.8BRIDGE=br0[root@www08:26:42network-scripts]#cat ifcfg-br0 DEVICE=br0 TYPE=BridgeIPADDR=172.20.23.30NETMASK=255.255.0.0GATEWAY=172.20.0.1DNS1=114.114.114.114DNS2=172.20.0.1BOOTPROTO=none ONBOOT=yes重启网络服务~

virsh和网络相关的命令：[root@www14:09:43~]#virsh help network Networking (help keyword 'network'):    net-autostart              net-create                         net-define         创建网络              net-destroy                        net-dhcp-leases                   net-dumpxml        查看网桥创建配置文件                net-edit                           net-event                         net-info                           net-list           查看网桥列表                net-name                           net-start                         net-undefine       删除网桥              net-update                       net-uuid                    如何创建一个虚拟网络：[root@www19:48:51networks]#cat mynet0.xml 
    
      
     
      mynet0
       
     
      72c15a3e-89ab-4d2c-819b-841342262eb1
       
       
       
         
            
           
        
     
    [root@www19:52:19networks]#virsh net-create ./mynet0.xml Network mynet0 created from ./mynet0.xml拆除之前mybr0的接口：brctl delif mybr0 eth1  查看拆除结果：[root@www19:56:07networks]#brctl showbridge name bridge id       STP enabled interfacesbr0     8000.000c2970f727   yes     eth0mybr0       8000.000000000000   yes     将接口添加至mybr1：[root@www19:56:17networks]#brctl addif mybr1 eth1[root@www19:57:07networks]#brctl showbridge name bridge id       STP enabled interfacesbr0     8000.000c2970f727   yes     eth0mybr0       8000.000000000000   yes     mybr1       8000.525400d7ee54   yes     eth1                            mybr1-nic测试和外面的mybr1链接：[root@www19:59:38networks]#ip netns exec r1 ping 192.168.24.3PING 192.168.24.3 (192.168.24.3) 56(84) bytes of data.64 bytes from 192.168.24.3: icmp_seq=1 ttl=64 time=0.069 ms64 bytes from 192.168.24.3: icmp_seq=2 ttl=64 time=0.093 ms创建一个虚拟机，选择和 mynet0 在同一网络！

brctl工具：来自----bridge-utils包[root@www14:09:24~]#rpm -qf `which brctl`bridge-utils-1.5-9.el7.x86_64常见选项：addbr --添加桥设备[软]delbr --删除桥设备[硬]addif --给网桥添加接口delif --网桥中拆除网线show  --查看所有桥信息stp   --开启生成树常见命令：添加网桥：brctl addbr mybr0启用禁用生成树：brctl stp mybr0 on/off激活网桥：ip link set [网桥名] up创建虚拟网卡对：ip link add veth1.1 type veth peer name veth1.2删除虚拟网卡对：ip link del veth1.1查看关联网卡对：ip link show更改虚拟网卡名称：ip link set veth1.1 name eth1启用虚拟网卡：ip link set eth1 upip link set eth2 up同样可以激活网桥：ip link set mybr0 up将网卡关联至网桥：brctl addif mybr0 eth1查看结果：[root@www19:26:30~]#brctl showbridge name bridge id       STP enabled interfacesbr0     8000.000c2970f727   yes     eth0mybr0       8000.82383e8abd07   yes     eth1添加网络名称空间：ip netns add r1查看网络名称空间列表：ip netns list把虚拟网卡设备关联至网络名称空间：ip link set dev eth2 netns r1 查看结果：[root@www19:30:21~]#ip netns exec r1 ifconfig -aeth2: flags=4098
    
       mtu 1500        ether fe:46:56:2f:ee:61  txqueuelen 1000  (Ethernet)        RX packets 8  bytes 648 (648.0 B)        RX errors 0  dropped 0  overruns 0  frame 0        TX packets 8  bytes 648 (648.0 B)        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0网络名称空间配置IP：ip netns exec r1 ifconfig eth0 172.20.23.2/16具体执行：ip netns exec r1 ifconfig eth2 192.168.23.2/24和r1空间链接测试：[root@www19:37:07~]#ping 192.168.23.2PING 192.168.23.2 (192.168.23.2) 56(84) bytes of data.64 bytes from 192.168.23.2: icmp_seq=1 ttl=64 time=0.461 ms64 bytes from 192.168.23.2: icmp_seq=2 ttl=64 time=0.036 ms如何从虚拟网桥中拆除接口：brctl delif mybr0 eth1更改网络名称空间中的虚拟网卡设备名称：ip netns exec r1 ip link set dev veth1.2 name eth0