我正在使用Ubuntu 16.04.2和KVM QEMU。
我将虚拟机configuration为桥接（即，它们应该从DHCP服务器获取自己的IP，并在networking上显示为单独的主机）。
但是，他们没有获得任何连接。 我不能从他们那里ping，我不能ping他们。 如果他们不能获得DHCP租约，我会期望他们得到169.xxx的IP，但他们却没有得到任何IP。
我不知道为什么，我无法修复它。 我将格式化机器，并重新安装一切，如果我不能得到它的工作，但我宁愿明白什么是问题，并修复它。
以下是在主机上运行的相关命令及其输出：
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 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 2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br0 state UP group default qlen 1000 link/ether 00:1d:09:0b:87:6d brd ff:ff:ff:ff:ff:ff inet6 fe80::21d:9ff:fe0b:876d/64 scope link valid_lft forever preferred_lft forever 3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 00:1d:09:0b:87:6d brd ff:ff:ff:ff:ff:ff inet 192.168.1.129/24 brd 192.168.1.255 scope global br0 valid_lft forever preferred_lft forever inet6 fe80::21d:9ff:fe0b:876d/64 scope link valid_lft forever preferred_lft forever 4: br-0e57a29cd0f7: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default link/ether 02:42:2b:9a:39:d6 brd ff:ff:ff:ff:ff:ff inet 172.18.0.1/16 scope global br-0e57a29cd0f7 valid_lft forever preferred_lft forever 5: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default link/ether 02:42:ed:8f:cb:c1 brd ff:ff:ff:ff:ff:ff inet 172.17.0.1/16 scope global docker0 valid_lft forever preferred_lft forever inet6 fe80::42:edff:fe8f:cbc1/64 scope link valid_lft forever preferred_lft forever 8: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000 link/ether 52:54:00:41:79:0f brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0 valid_lft forever preferred_lft forever 9: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN group default qlen 1000 link/ether 52:54:00:41:79:0f brd ff:ff:ff:ff:ff:ff 16: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN group default qlen 1000 link/ether fe:54:00:81:08:d0 brd ff:ff:ff:ff:ff:ff inet6 fe80::fc54:ff:fe81:8d0/64 scope link valid_lft forever preferred_lft forever 32: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN group default qlen 1000 link/ether fe:54:00:72:c2:db brd ff:ff:ff:ff:ff:ff inet6 fe80::fc54:ff:fe72:c2db/64 scope link valid_lft forever preferred_lft forever 34: vethbae4bfe@if33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP group default link/ether 72:a8:cd:d9:9c:fe brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet6 fe80::70a8:cdff:fed9:9cfe/64 scope link valid_lft forever preferred_lft forever
$ ip l
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br0 state UP mode DEFAULT group default qlen 1000 link/ether 00:1d:09:0b:87:6d brd ff:ff:ff:ff:ff:ff 3: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000 link/ether 00:1d:09:0b:87:6d brd ff:ff:ff:ff:ff:ff 4: br-0e57a29cd0f7: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default link/ether 02:42:2b:9a:39:d6 brd ff:ff:ff:ff:ff:ff 5: docker0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default link/ether 02:42:ed:8f:cb:c1 brd ff:ff:ff:ff:ff:ff 8: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:41:79:0f brd ff:ff:ff:ff:ff:ff 9: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:41:79:0f brd ff:ff:ff:ff:ff:ff 16: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN mode DEFAULT group default qlen 1000 link/ether fe:54:00:81:08:d0 brd ff:ff:ff:ff:ff:ff 32: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br0 state UNKNOWN mode DEFAULT group default qlen 1000 link/ether fe:54:00:72:c2:db brd ff:ff:ff:ff:ff:ff 34: vethbae4bfe@if33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master docker0 state UP mode DEFAULT group default link/ether 72:a8:cd:d9:9c:fe brd ff:ff:ff:ff:ff:ff link-netnsid 0
$ brctl show
bridge name bridge id STP enabled interfaces br-0e57a29cd0f7 8000.02422b9a39d6 no br0 8000.001d090b876d no enp4s0 vnet0 vnet1 docker0 8000.0242ed8fcbc1 no vethbae4bfe virbr0 8000.52540041790f yes virbr0-nic
$ virsh net-list --all
Name State Autostart Persistent ---------------------------------------------------------- default active yes yes
$ virsh net-dumpxml default
<network> <name>default</name> <uuid>42aa6628-f6c8-4169-9b38-1f6f5cbb7a04</uuid> <forward mode='nat'> <nat> <port start='1024' end='65535'/> </nat> </forward> <bridge name='virbr0' stp='on' delay='0'/> <mac address='52:54:00:41:79:0f'/> <ip address='192.168.122.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.122.2' end='192.168.122.254'/> </dhcp> </ip> </network>
$ virsh dumpxml downloader
<domain type='kvm' id='9'> <name>downloader</name> <uuid>9241d93d-b403-4347-bdda-002b5ee8f344</uuid> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>524288</currentMemory> <vcpu placement='static'>2</vcpu> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64' machine='pc-i440fx-xenial'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> </features> <cpu mode='custom' match='exact'> <model fallback='allow'>core2duo</model> </cpu> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <pm> <suspend-to-mem enabled='no'/> <suspend-to-disk enabled='no'/> </pm> <devices> <emulator>/usr/bin/kvm-spice</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw'/> <source file='/media/storage/vm_disks/downloader.img'/> <backingStore/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </disk> <controller type='usb' index='0' model='ich9-ehci1'> <alias name='usb'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x7'/> </controller> <controller type='usb' index='0' model='ich9-uhci1'> <alias name='usb'/> <master startport='0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0' multifunction='on'/> </controller> <controller type='usb' index='0' model='ich9-uhci2'> <alias name='usb'/> <master startport='2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x1'/> </controller> <controller type='usb' index='0' model='ich9-uhci3'> <alias name='usb'/> <master startport='4'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'> <alias name='pci.0'/> </controller> <controller type='virtio-serial' index='0'> <alias name='virtio-serial0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> </controller> <interface type='bridge'> <mac address='52:54:00:72:c2:db'/> <source bridge='br0'/> <target dev='vnet1'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <source path='/dev/pts/2'/> <target port='0'/> <alias name='serial0'/> </serial> <console type='pty' tty='/dev/pts/2'> <source path='/dev/pts/2'/> <target type='serial' port='0'/> <alias name='serial0'/> </console> <channel type='spicevmc'> <target type='virtio' name='com.redhat.spice.0' state='disconnected'/> <alias name='channel0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='spice' port='5901' autoport='yes' listen='127.0.0.1'> <listen type='address' address='127.0.0.1'/> <image compression='off'/> </graphics> <sound model='ich6'> <alias name='sound0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/> <alias name='video0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <redirdev bus='usb' type='spicevmc'> <alias name='redir0'/> </redirdev> <redirdev bus='usb' type='spicevmc'> <alias name='redir1'/> </redirdev> <memballoon model='virtio'> <stats period='5'/> <alias name='balloon0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </memballoon> </devices> <seclabel type='dynamic' model='apparmor' relabel='yes'> <label>libvirt-9241d93d-b403-4347-bdda-002b5ee8f344</label> <imagelabel>libvirt-9241d93d-b403-4347-bdda-002b5ee8f344</imagelabel> </seclabel> </domain>
$ 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). source /etc/network/interfaces.d/* # The loopback network interface auto lo iface lo inet loopback # The primary network interface # auto enp4s0 # iface enp4s0 inet manual # VMs bridge auto br0 iface br0 inet dhcp bridge_ports enp4s0 bridge_stp off bridge_fd 0 bridge_maxwait 0
`$ virsh net-start默认
error: Failed to start network default error: Requested operation is not valid: network is already active
$ ip route
default via 192.168.1.1 dev br0 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 172.18.0.0/16 dev br-0e57a29cd0f7 proto kernel scope link src 172.18.0.1 linkdown 192.168.1.0/24 dev br0 proto kernel scope link src 192.168.1.129 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
$ iptables -L
Chain INPUT (policy ACCEPT) target prot opt source destination DROP all -- 221.7.38.200 anywhere ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps f2b-sshd tcp -- anywhere anywhere multiport dports ssh Chain FORWARD (policy DROP) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 ctstate RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable DOCKER-ISOLATION all -- anywhere anywhere DOCKER all -- anywhere anywhere ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED ACCEPT all -- anywhere anywhere ACCEPT all -- anywhere anywhere DOCKER all -- anywhere anywhere ACCEPT all -- anywhere anywhere ctstate RELATED,ESTABLISHED ACCEPT all -- anywhere anywhere ACCEPT all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:bootpc Chain DOCKER (2 references) target prot opt source destination ACCEPT tcp -- anywhere 172.17.0.2 tcp dpt:http Chain DOCKER-ISOLATION (1 references) target prot opt source destination DROP all -- anywhere anywhere DROP all -- anywhere anywhere RETURN all -- anywhere anywhere Chain f2b-sshd (1 references) target prot opt source destination RETURN all -- anywhere anywhere