openstack计算节点宕机迁移方案
情景一:/var/lib/nova/instances/ 目录不共享的处理方法(类似手动迁移云主机到其他节点)
查看正在运行的云主机xml
[root@node3 ~]# virsh dumpxml d045e4dd-5598-40b4-82e7-bddc0fcde14c
<domain type='kvm' id='1'>
<name>instance-000001b6</name>
<uuid>d045e4dd-5598-40b4-82e7-bddc0fcde14c</uuid>
<metadata>
<nova:instance xmlns:nova="http://openstack.org/xmlns/libvirt/nova/1.0">
<nova:package version="17.0.13-1.el7"/>
<nova:name>tomcat-vm2</nova:name>
<nova:creationTime>2020-02-21 01:28:16</nova:creationTime>
<nova:flavor name="1c2g">
<nova:memory>2024</nova:memory>
<nova:disk>40</nova:disk>
<nova:swap>0</nova:swap>
<nova:ephemeral>0</nova:ephemeral>
<nova:vcpus>1</nova:vcpus>
</nova:flavor>
<nova:owner>
<nova:user uuid="51ffe09d0ed342f4bf4e443e454055cc">admin</nova:user>
<nova:project uuid="75aed7016c86445198356e78dddde4ba">admin</nova:project>
</nova:owner>
<nova:root type="image" uuid="75398b9c-5cd6-4936-a093-eba02984f7f0"/>
</nova:instance>
</metadata>
<memory unit='KiB'>2072576</memory>
<currentMemory unit='KiB'>2072576</currentMemory>
<vcpu placement='static'>1</vcpu>
<cputune>
<shares>1024</shares>
</cputune>
<resource>
<partition>/machine</partition>
</resource>
<sysinfo type='smbios'>
<system>
<entry name='manufacturer'>RDO</entry>
<entry name='product'>OpenStack Compute</entry>
<entry name='version'>17.0.13-1.el7</entry>
<entry name='serial'>4a7258d2-f86c-af77-106d-598ffd558b8e</entry>
<entry name='uuid'>d045e4dd-5598-40b4-82e7-bddc0fcde14c</entry>
<entry name='family'>Virtual Machine</entry>
</system>
</sysinfo>
<os>
<type arch='x86_64' machine='pc-i440fx-rhel7.6.0'>hvm</type>
<boot dev='hd'/>
<smbios mode='sysinfo'/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='custom' match='exact' check='full'>
<model fallback='forbid'>IvyBridge-IBRS</model>
<vendor>Intel</vendor>
<topology sockets='1' cores='1' threads='1'/>
<feature policy='require' name='ss'/>
<feature policy='require' name='vmx'/>
<feature policy='require' name='pcid'/>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='arat'/>
<feature policy='require' name='tsc_adjust'/>
<feature policy='require' name='umip'/>
<feature policy='require' name='stibp'/>
<feature policy='require' name='ssbd'/>
<feature policy='require' name='xsaveopt'/>
<feature policy='require' name='pdpe1gb'/>
</cpu>
<clock offset='utc'>
<timer name='pit' tickpolicy='delay'/>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/var/lib/nova/instances/d045e4dd-5598-40b4-82e7-bddc0fcde14c/disk'/>
<backingStore type='file' index='1'>
<format type='raw'/>
<source file='/var/lib/nova/instances/_base/138d5db2b1f3dec2e4d41721505aede7454d7cd2'/>
<backingStore/>
</backingStore>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
<controller type='usb' index='0' model='piix3-uhci'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<alias name='pci.0'/>
</controller>
<interface type='bridge'>
<mac address='fa:16:3e:93:1a:23'/>
<source bridge='brq5ac5c948-90'/>
<target dev='tap22a81bb2-3a'/>
<model type='virtio'/>
<mtu size='1500'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<interface type='bridge'>
<mac address='fa:16:3e:cb:2a:67'/>
<source bridge='brq85ae5035-20'/>
<target dev='tap14a1350e-51'/>
<model type='virtio'/>
<mtu size='1450'/>
<alias name='net1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/0'/>
<log file='/var/lib/nova/instances/d045e4dd-5598-40b4-82e7-bddc0fcde14c/console.log' append='off'/>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/0'>
<source path='/dev/pts/0'/>
<log file='/var/lib/nova/instances/d045e4dd-5598-40b4-82e7-bddc0fcde14c/console.log' append='off'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='tablet' bus='usb'>
<alias name='input0'/>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'>
<alias name='input1'/>
</input>
<input type='keyboard' bus='ps2'>
<alias name='input2'/>
</input>
<graphics type='vnc' port='5900' autoport='yes' listen='0.0.0.0' keymap='en-us'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<stats period='10'/>
<alias name='balloon0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</memballoon>
</devices>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+107:+107</label>
<imagelabel>+107:+107</imagelabel>
</seclabel>
</domain>
1.1迁移xml文件和云主机镜像
[root@node3 ~]# scp /var/lib/nova/instances/_base/138d5db2b1f3dec2e4d41721505aede7454d7cd2 root@node4:/var/lib/nova/instances/_base/
[root@node3 ~]# ssh node4 mkdir -pv /var/lib/nova/instances/d045e4dd-5598-40b4-82e7-bddc0fcde14c/
[root@node3 ~]# scp /var/lib/nova/instances/d045e4dd-5598-40b4-82e7-bddc0fcde14c/disk root@node4:/var/lib/nova/instances/d045e4dd-5598-40b4-82e7-bddc0fcde14c/
[root@node3 ~]# virsh dumpxml d045e4dd-5598-40b4-82e7-bddc0fcde14c >d045e4dd-5598-40b4-82e7-bddc0fcde14c.xml
[root@node3 ~]# scp d045e4dd-5598-40b4-82e7-bddc0fcde14c.xml root@node4:/root/
1.2控制器上修改数据库
mysql -Dnova -e "update instances set host='node4' where uuid='d045e4dd-5598-40b4-82e7-bddc0fcde14c'"
mysql -Dnova -e "update instances set launched_on='node4' where uuid='d045e4dd-5598-40b4-82e7-bddc0fcde14c'"
1.3初始化迁移后的XML文件及启动云主机
[root@node4 data]# virsh define d045e4dd-5598-40b4-82e7-bddc0fcde14c.xml
[root@node4 data]# virsh start d045e4dd-5598-40b4-82e7-bddc0fcde14c
1.4验证是否成功
情景二:/var/lib/nova/instances/ 目录共享的处理方法
2.1控制器上修改数据库
mysql -Dnova -e "update instances set host='node3' where uuid='d045e4dd-5598-40b4-82e7-bddc0fcde14c'"
mysql -Dnova -e "update instances set launched_on='node4' where uuid='d045e4dd-5598-40b4-82e7-bddc0fcde14c'"
2.2修改完数据库以后在horizon界面硬重启这台虚拟机就ok了