KVM基础3

franket

发布于 2022-01-19 10:49:12

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发布于 2022-01-19 10:49:12

文章被收录于专栏：技术杂记

创建网桥

为了和宿主机有平等的网络层级 (能使用到上面的dhcp)，可以通过构建网桥的办法来实现

配置

[root@kvm-demo network-scripts]# grep -v "^#" ifcfg-eth0 


DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
BRIDGE=br0
[root@kvm-demo network-scripts]# grep -v "^#" ifcfg-br0
DEVICE=br0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.234
NETMASK=255.255.255.0
GATEWAY=192.168.1.2
[root@kvm-demo network-scripts]#

重启网络

为了使配置生效，得重启网络

[root@kvm-demo network-scripts]# /etc/init.d/network restart ; ifup br0 
Shutting down interface br0:                               [  OK  ]
Shutting down interface eth0:                              [  OK  ]
Shutting down loopback interface:                          [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface br0:  Device br0 does not seem to be present, delaying initialization.
                                                           [FAILED]
Bringing up interface eth0:                                [  OK  ]
Determining if ip address 192.168.1.234 is already in use for device br0...
[root@kvm-demo network-scripts]#

Note: 最好使用 /etc/init.d/network restart ; ifup br0 , 因为并不一定重启网络会带着 br0 一起重启，如果是远程操作，这个时候就有很大的风险与主机失联，这时原网卡没有配置ip，br0又没启动，会产生很大的麻烦，只能去机房通过服务器的console进行恢复

这时会多出一个br0的网桥

[root@kvm-demo network-scripts]# ifconfig 
br0       Link encap:Ethernet  HWaddr E8:39:35:53:4B:E9  
          inet addr:192.168.1.234  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::ea39:35ff:fe53:4be9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1399 errors:0 dropped:0 overruns:0 frame:0
          TX packets:882 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:250070 (244.2 KiB)  TX bytes:118534 (115.7 KiB)

eth0      Link encap:Ethernet  HWaddr E8:39:35:53:4B:E9  
          inet6 addr: fe80::ea39:35ff:fe53:4be9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:67254 errors:0 dropped:0 overruns:0 frame:0
          TX packets:39584 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:13622758 (12.9 MiB)  TX bytes:5178583 (4.9 MiB)
          Interrupt:20 Memory:fb000000-fb020000 

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)

virbr0    Link encap:Ethernet  HWaddr 52:54:00:83:A4:A0  
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  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@kvm-demo network-scripts]#

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