openstack高可用集群20-openstack计算节点宕机迁移方案

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