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OpenStack计算节点挂掉之后，虚拟机恢复方式
OpenStack计算节点挂掉之后，虚拟机恢复方式
2020-12-09
#环境信息
OS --> CentOS7.2-1511
OpenStack --> Mikata
Ceph -->j版
虽然OpenStack自带有迁移和疏散机制，但并不一定保证100%成功，本文基于疏散失败的情况，来恢复实例。
起因客户那边，物理机系统盘故障，导致数据全部丢失，最开始想到的方法是疏散，直接在dashboard或者控制节点终端执行疏散命令
nova evacuate node09
然而事情并没有到此结束，有2台虚拟机，一直疏散不了，没办法，数据最重要，由于nova，glance，cinder使用的都是ceph，即数据都存放在ceph中，这样恢复起来就有了可能，
具体步骤如下：
重建libvirt.xml文件
首先查看一下拟机信息
nova show 6bb3bc65-91c3-486c-b853-2a5c879a5395
具体信息如下：
+--------------------------------------+----------------------------------------------------------+
| Property | Value |
+--------------------------------------+----------------------------------------------------------+
| network | 192.168.10.25, xx.xx.xx.xx |
| OS-DCF:diskConfig | AUTO |
| OS-EXT-AZ:availability_zone | nova |
| OS-EXT-SRV-ATTR:host | node03 |
| OS-EXT-SRV-ATTR:hypervisor_hostname | node03 |
| OS-EXT-SRV-ATTR:instance_name | instance-000001ae |
| OS-EXT-STS:power_state | 1 |
| OS-EXT-STS:task_state | - |
| OS-EXT-STS:vm_state | active |
| OS-SRV-USG:launched_at | 2017-06-23T06:03:20.000000 |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| config_drive | |
| created | 2017-06-23T06:01:44Z |
| flavor | yunwei01 (d76ea4cd-0c46-423c-9a2a-0ab15c5a1b0a) |
| hostId | 7081812a3c654f417fc545300ecd03252d8ac4bf992b54272bcfee61 |
| id | 6bb3bc65-91c3-486c-b853-2a5c879a5395 |
| image | centos65 (0488b591-1755-4da0-abe9-8e5c2a6931b5) |
| key_name | - |
| metadata | {} |
| name | rhea-2 |
| os-extended-volumes:volumes_attached | [{"id": "7cd2936a-b4ef-4e85-8159-eace4c1b7981"}] |
| progress | 0 |
| security_groups | default |
| status | ACTIVE |
| tenant_id | 290f841df5644709847a51d6604a228f |
| updated | 2017-12-21T06:46:13Z |
| user_id | d158732076c740aead5286969273faea |
+-------------------------------------+----------------------------------------------------------+记录这些信息，后面有大用
在平台上，找一个flavor和image相同的实例，找到此实例uuid
查看该实例信息
nova show uuid
进入到相应节点,拷贝libvirt.xml和console.log
cd /var/lib/nova/instance/$uuid/cp * /mnt/bakrecoverycd /mnt/bakrecoverymore libvirt.xml
信息如下：
<domain type="kvm"> <uuid>6bb3bc65-91c3-486c-b853-2a5c879a5395</uuid> <name>instance-000001ae</name> <memory>16777216</memory> <vcpu>16</vcpu> <metadata> <nova:instance xmlns:nova="http://openstack.org/xmlns/libvirt/nova/1.0"> <nova:package version="13.1.0-1.el7"/> <nova:name>rhea-2</nova:name> <nova:creationTime>2017-12-21 06:46:11</nova:creationTime> <nova:flavor name="yunwei01"> <nova:memory>16384</nova:memory> <nova:disk>40</nova:disk> <nova:swap>2048</nova:swap> <nova:ephemeral>0</nova:ephemeral> <nova:vcpus>16</nova:vcpus> </nova:flavor> <nova:owner> <nova:user uuid="3eb5de8526c14da495488f1a264915f6">admin</nova:user> <nova:project uuid="10d0b378c82d4b5da2288ef852ca5bd1">admin</nova:project> </nova:owner> <nova:root type="image" uuid="0488b591-1755-4da0-abe9-8e5c2a6931b5"/> </nova:instance> </metadata> <sysinfo type="smbios"> <system> <entry name="manufacturer">Fedora Project</entry> <entry name="product">OpenStack Nova</entry> <entry name="version">13.1.0-1.el7</entry> <entry name="serial">d3c7a080-2534-4b5f-9d86-9cd152acc671</entry> <entry name="uuid">6bb3bc65-91c3-486c-b853-2a5c879a5395</entry> <entry name="family">Virtual Machine</entry> </system> </sysinfo> <os> <type>hvm</type> <boot dev="hd"/> <smbios mode="sysinfo"/> </os> <features> <acpi/> <apic/> </features> <cputune> <shares>16384</shares> </cputune> <clock offset="utc"> <timer name="pit" tickpolicy="delay"/> <timer name="rtc" tickpolicy="catchup"/> <timer name="hpet" present="no"/> </clock> <cpu mode="host-model" match="exact"> <topology sockets="16" cores="1" threads="1"/> </cpu> <devices> <disk type="network" device="disk"> <driver type="raw" cache="writeback"/> <source protocol="rbd" name="vms/6bb3bc65-91c3-486c-b853-2a5c879a5395_disk"> <host name="172.16.2.5" port="6789"/> <host name="172.16.2.6" port="6789"/> <host name="172.16.2.7" port="6789"/> </source> <auth username="cinder"> <secret type="ceph" uuid="14fdf1bb-44d7-40ad-a98a-16fe7e65115b"/> </auth> <target bus="virtio" dev="vda"/> </disk> <disk type="network" device="disk"> <driver type="raw" cache="writeback"/> <source protocol="rbd" name="vms/6bb3bc65-91c3-486c-b853-2a5c879a5395_disk.swap"> <host name="172.16.2.5" port="6789"/> <host name="172.16.2.6" port="6789"/> <host name="172.16.2.7" port="6789"/> </source> <auth username="cinder"> <secret type="ceph" uuid="14fdf1bb-44d7-40ad-a98a-16fe7e65115b"/> </auth> <target bus="virtio" dev="vdb"/> </disk> <disk type="network" device="disk"> <driver name="qemu" type="raw" cache="writeback"/> <source protocol="rbd" name="volumes/volume-7cd2936a-b4ef-4e85-8159-eace4c1b7981"> <host name="172.16.2.5" port="6789"/> <host name="172.16.2.6" port="6789"/> <host name="172.16.2.7" port="6789"/> </source> <auth username="cinder"> <secret type="ceph" uuid="14fdf1bb-44d7-40ad-a98a-16fe7e65115b"/> </auth> <target bus="virtio" dev="vdc"/> <serial>7cd2936a-b4ef-4e85-8159-eace4c1b7981</serial> </disk> <interface type="bridge"> <mac address="fa:16:3e:34:e3:fe"/> <model type="virtio"/> <source bridge="qbrff441fbc-bb"/> <target dev="tapff441fbc-bb"/> </interface> <serial type="file"> <source path="/var/lib/nova/instances/6bb3bc65-91c3-486c-b853-2a5c879a5395/console.log"/> </serial> <serial type="pty"/> <input type="tablet" bus="usb"/> <graphics type="vnc" autoport="yes" keymap="en-us" listen="0.0.0.0"/> <video> <model type="cirrus"/> </video> <memballoon model="virtio"> <stats period="10"/> </memballoon> </devices></domain>
需要修改如下部分：
1.name和uuid
<uuid>6bb3bc65-91c3-486c-b853-2a5c879a5395</uuid> <name>instance-000001ae</name>
前面记录信息，刚好派上用场
2.name和创建时间
<nova:name>rhea-2</nova:name> <nova:creationTime>2017-12-21 06:46:11</nova:creationTime>
这个name是创建实例的时候，我们起的名字，上面的那个，是随机生成的名字
3.修改相应uuid（包括image，project，user）
<nova:user uuid="3eb5de8526c14da495488f1a264915f6">admin</nova:user> <nova:project uuid="10d0b378c82d4b5da2288ef852ca5bd1">admin</nova:project> </nova:owner> <nova:root type="image" uuid="0488b591-1755-4da0-abe9-8e5c2a6931b5"/>
3.修改虚拟机uuid，和serial，serial通过比对发现，同一个计算节点这个号相同
<entry name="serial">d3c7a080-2534-4b5f-9d86-9cd152acc671</entry> <entry name="uuid">6bb3bc65-91c3-486c-b853-2a5c879a5395</entry> <entry name="family">Virtual Machine</entry
4.块设备id，格式为虚拟机uuid_disk,uuid_swap
<source protocol="rbd" name="vms/6bb3bc65-91c3-486c-b853-2a5c879a5395_disk"><source protocol="rbd" name="vms/6bb3bc65-91c3-486c-b853-2a5c879a5395_disk.swap">
5.通过cinder划分的卷id
<target bus="virtio" dev="vdc"/> <serial>7cd2936a-b4ef-4e85-8159-eace4c1b7981</serial> </disk>
6.虚拟机网卡mac地址，还有端口，这里，mac地址可通过dashboard查看，admin账户下，管理员–>网络–>（网络）uuid–>端口
<interface type="bridge"> <mac address="fa:16:3e:34:e3:fe"/> <model type="virtio"/> <source bridge="qbrff441fbc-bb"/> <target dev="tapff441fbc-bb"/>
7.console日志路径
source path="/var/lib/nova/instances/6bb3bc65-91c3-486c-b853-2a5c879a5395/console.log"/>
8.对比修改完后，一定要仔细确认，以免出现问题
mkdir -p /var/lib/nova/instance/$uuidcp libvirt.xml /var/lib/nova/instance/$uuidcp console.log /var/lib/nova/instance/$uuid
修改权限
chown nova.nova /var/lib/nova/instance/$uuid/xmlchown qemu.qemu /var/lib/nova/instance/$uuid/console.log
在数据库中修改节点信息
update instances set host='node10',node='node10' where uuid='6bb3bc65-91c3-486c-b853-2a5c879a5395';
重启相应节点nova-coompute服务
systemctl restart openstack-nova-compute
启动实例，启动后网络可能不通，这时可以通过迁移来解决，
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