#Centos7.4#Linux虚拟机KVM配置网卡【Requested operation is not valid: network 'br0' is not active】...

mac2022-06-30 55

案例：

【20181218 10:25 事故描述】

jump宿主机服务器172.16.20.16死机，联系机房管理员重启，拨通机房vpn后ssh连接不上

【20181219 11:25 现场问题排查】

网卡显示ip是172.16.20.161，没有kvm桥接网卡br0，

启动kvm虚拟机报错：Requested operation is not valid: network 'br0' is not active

#ifconfigenp1s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet 172.16.20.161 netmask 255.255.255.0 broadcast 172.16.20.255inet6 fe80::226:6cff:fef5:a514 prefixlen 64 scopeid 0x20<link>ether 00:26:6c:f5:a5:14 txqueuelen 0 (Ethernet)RX packets 31936 bytes 1780910 (1.6 MiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 2511 bytes 364044 (355.5 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

【解决问题】

1、##kvm网桥网卡br0配置##brctl addbr br0 #创建网桥brctl addif br0 eth0 #把br0和eth0网卡绑定brctl stp br0 on #有关stp协议的

2、在/etc/sysconfig/network-scripts/目录cp ifcfg-enp1s0f0 ifcfg-br0

3、修改配置网卡信息 ifcfg-enp1s0f0 和ifcfg-br0信息

【ifcfg-enp1s0f0】

TYPE=EthernetBOOTPROTO=noneDEFROUTE=yesPEERDNS=yesPEERROUTES=yesNM_CONTROLLED=noIPV4_FAILURE_FATAL=noIPV6INIT=yesIPV6_AUTOCONF=yesIPV6_DEFROUTE=yesIPV6_PEERDNS=yesIPV6_PEERROUTES=yesIPV6_FAILURE_FATAL=noNAME=enp1s0f0UUID=b4a34022-21d9-4f88-80c3-f4a625c16d5dDEVICE=enp1s0f0ONBOOT=yesBRIDGE=br0

【ifcfg-br0】

TYPE=BridgeBOOTPROTO=staticDEFROUTE=yesPEERDNS=yesPEERROUTES=yesNM_CONTROLLED=noIPV4_FAILURE_FATAL=noIPV6INIT=yesIPV6_AUTOCONF=yesIPV6_DEFROUTE=yesIPV6_PEERDNS=yesIPV6_PEERROUTES=yesIPV6_FAILURE_FATAL=noNAME=br0DEVICE=br0ONBOOT=yesIPADDR=172.16.20.16NETMASK=255.255.255.0GATEWAY=172.16.20.1DNS1=114.114.114.114

4、

5、

6、#virsh start jumpserver 启动kvm虚拟机jumpserver

【修改后的宿主机配置】

#ifconfigbr0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet 172.16.20.16 netmask 255.255.255.0 broadcast 172.16.20.255inet6 fe80::226:6cff:fef5:a514 prefixlen 64 scopeid 0x20<link>ether 00:26:6c:f5:a5:14 txqueuelen 0 (Ethernet)RX packets 31936 bytes 1780910 (1.6 MiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 2511 bytes 364044 (355.5 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

enp1s0f0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500inet6 fe80::226:6cff:fef5:a514 prefixlen 64 scopeid 0x20<link>ether 00:26:6c:f5:a5:14 txqueuelen 1000 (Ethernet)RX packets 9445502 bytes 584441758 (557.3 MiB)RX errors 0 dropped 94 overruns 0 frame 0TX packets 137325 bytes 32258671 (30.7 MiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0device memory 0xfafe0000-faffffff

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536inet 127.0.0.1 netmask 255.0.0.0inet6 ::1 prefixlen 128 scopeid 0x10<host>loop txqueuelen 0 (Local Loopback)RX packets 7217 bytes 410182 (400.5 KiB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 7217 bytes 410182 (400.5 KiB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

操作票1、virsh net-list --all

##kvm网桥网卡配置##brctl addbr br0 #创建网桥brctl addif br0 eth0 #把br0和eth0网卡绑定brctl stp br0 on #有关stp协议的

cp ifcfg-eth0 ifcfg-br0【修改前ifcfg-eth0】TYPE=EthernetBOOTPROTO=staticDEFROUTE=yesPEERDNS=yesPEERROUTES=yesNM_CONTROLLED=noIPV4_FAILURE_FATAL=noIPV6INIT=yesIPV6_AUTOCONF=yesIPV6_DEFROUTE=yesIPV6_PEERDNS=yesIPV6_PEERROUTES=yesIPV6_FAILURE_FATAL=noNAME=eth0UUID=b4a34022-21d9-4f88-80c3-f4a625c16d5dDEVICE=eth0ONBOOT=yesIPADDR=172.16.20.16NETMASK=255.255.255.0GATEWAY=172.16.20.1DNS1=114.114.114.114

修改ifcfg-eth0文件BOOTRPOTO=none追加 BRIDGE=br0###【修改后ifcfg-br0和ifcfg-eth0】[root@BD-PRD-Docker network-scripts]# cat ifcfg-br0TYPE=BridgeBOOTPROTO=staticDEFROUTE=yesPEERDNS=yesPEERROUTES=yesNM_CONTROLLED=noIPV4_FAILURE_FATAL=noIPV6INIT=yesIPV6_AUTOCONF=yesIPV6_DEFROUTE=yesIPV6_PEERDNS=yesIPV6_PEERROUTES=yesIPV6_FAILURE_FATAL=noNAME=br0DEVICE=br0ONBOOT=yesIPADDR=172.16.20.16NETMASK=255.255.255.0GATEWAY=172.16.20.1DNS1=114.114.114.114

[root@BD-PRD-Docker network-scripts]# cat ifcfg-enp1s0f0TYPE=EthernetBOOTPROTO=noneDEFROUTE=yesPEERDNS=yesPEERROUTES=yesNM_CONTROLLED=noIPV4_FAILURE_FATAL=noIPV6INIT=yesIPV6_AUTOCONF=yesIPV6_DEFROUTE=yesIPV6_PEERDNS=yesIPV6_PEERROUTES=yesIPV6_FAILURE_FATAL=noNAME=enp1s0f0UUID=b4a34022-21d9-4f88-80c3-f4a625c16d5dDEVICE=enp1s0f0ONBOOT=yes#IPADDR=172.16.20.16#NETMASK=255.255.255.0#GATEWAY=172.16.20.1#DNS1=114.114.114.114BRIDGE=br0

service network restart

【可能用到的命令】brctl addbr br0 #创建网桥

brctl addif br0 eth0 #把br0和eth0网卡绑定

brctl stp br0 on #有关stp协议的

brctl delif br0 eth0 #解除绑定

ifconfig br0 down #关闭br0,不关闭删不掉

brctl delbr br0 #删除br0

关闭NetworkManager#service NetworkManager stop#chkconfig NetworkManager off#kvm命令#virsh 进入kvm控制台##list --all显示所有kvm虚拟机##console id或者name 进入kvm机子virsh net-list --all显示所有网络接口，default接口是默认的nat转发virsh net-destroy default 关闭default网络接口virsh net-undefine default 删除default网络接口service libvirtd restart 重启kvm服务

virsh shutdown jumpserver 关闭kvm虚拟机virsh start jumpserver 启动kvm虚拟机

【修改kvm虚拟机的资源大小cpu、内存、硬盘】

# virsh list --all

Id Name State-------------------------------------------------- bbotte shut off # virsh setvcpus bbotte --maximum 4 --config# virsh setmaxmem bbotte 1048576 --config

# virsh dominfo bbotteId: 2Name: bbotteUUID: bd22f444-ee7f-7f00-3d1b-1bb0d0857e43OS Type: hvmState: runningCPU(s): 4CPU time: 152.3sMax memory: 1048576 KiBUsed memory: 524288 KiBPersistent: yesAutostart: disableManaged save: noSecurity model: noneSecurity DOI: 0 ####修改xml配置文件###

1、virsh edit centos73 （更改前要将virsh shutdown centos73 ）找到“memory”和“vcpu”标签，将 <name>centos73</name> <uuid>2220a6d1-a36a-4fbb-8523-e078b3dfe795</uuid> <memory unit='KiB'>2097152</memory> <currentMemory unit='KiB'>2097152</currentMemory> <vcpu placement='static'>1</vcpu> 改为： <name>centos73</name> <uuid>2220a6d1-a36a-4fbb-8523-e078b3dfe795</uuid> <memory unit='KiB'>3145728</memory> <currentMemory unit='KiB'>3145728</currentMemory> <vcpu placement='static'>2</vcpu> virsh define /etc/libvirt/qemu/centos73.xml 重定义使配置生效重启虚拟机 virsh start centos73 --console 查看原配置信息 [root@localhost kvm]# virsh dominfo centos734 Id: - Name: centos73 UUID: 2220a6d1-a36a-4fbb-8523-e078b3dfe795 OS Type: hvm State: shut off CPU(s): 1 Max memory: 2097152 KiB Used memory: 2097152 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0 调整后信息： [root@localhost kvm]# virsh dominfo centos73 Id: - Name: centos73 UUID: 2220a6d1-a36a-4fbb-8523-e078b3dfe795 OS Type: hvm State: shut off CPU(s): 2 Max memory: 3145728 KiB Used memory: 3145728 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0

参考连接：

http://blog.sina.com.cn/s/blog_625fcb0b0102wayc.htmlhttp://blog.51cto.com/13570993/2061254

https://blog.csdn.net/hnhuangyiyang/article/details/50902223

转载于:https://www.cnblogs.com/huanglinxin/p/10148572.html

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