HQY 一个和谐有爱的空间

一、基本原理

冻结IO

# fsfreeze -f /mnt/backup/

测试

# echo 'this is a testcat '>> /mnt/backup/test1.txt

挂起.不能写入信息

解冻:

# fsfreeze -u /mnt/backup/

二、QGA冻结IO

1、在虚拟机中安装qemu-ga，

# yum install qemu-guest-agent

2、修改安装后的qemu-ga配置文件/etc/sysconfig/qemu-ga

FSFREEZE_HOOK_ENABLE=1

#BLACKLIST_RPC="guest-file-open,guest-file-close,guest-file-read,guest-file-write,guest-file-seek,guest-file-flush"

3、将虚拟机关机，在虚拟机配置文件libvirt.xml中的下面添加下述配置，并重新启动虚拟机

<channel type='unix'>

   <source mode='bind' path='/var/lib/libvirt/qemu/f16x86_64.agent'/>

   <target type='virtio' name='org.qemu.guest_agent.0'/>

</channel>

3、测试是否正常：

# virsh qemu-agent-command 90 '{"execute":"guest-info"}'

{"return":{"version":"0.12.1","supported_commands":[{"enabled":true,"name":"guest-set-vcpus"},{"enabled":true,"name":"guest-get-vcpus"},{"enabled":true,"name":"guest-network-get-interfaces"},{"enabled":true,"name":"guest-suspend-hybrid"},{"enabled":true,"name":"guest-suspend-ram"},{"enabled":true,"name":"guest-suspend-disk"},{"enabled":true,"name":"guest-fstrim"},{"enabled":true,"name":"guest-fsfreeze-thaw"},{"enabled":true,"name":"guest-fsfreeze-freeze"},{"enabled":true,"name":"guest-fsfreeze-status"},{"enabled":true,"name":"guest-file-flush"},{"enabled":true,"name":"guest-file-seek"},{"enabled":true,"name":"guest-file-write"},{"enabled":true,"name":"guest-file-read"},{"enabled":true,"name":"guest-file-close"},{"enabled":true,"name":"guest-file-open"},{"enabled":true,"name":"guest-shutdown"},{"enabled":true,"name":"guest-info"},{"enabled":true,"name":"guest-set-time"},{"enabled":true,"name":"guest-get-time"},{"enabled":true,"name":"guest-ping"},{"enabled":true,"name":"guest-sync"},{"enabled":true,"name":"guest-sync-delimited"}]}}

#直接用virsh命令，freeze文件系统

# virsh qemu-agent-command 90 '{"execute":"guest-fsfreeze-freeze"}'

{"return":1}

freeze后，可以查询当前虚拟机文件系统的状态，表明是frozen

# virsh qemu-agent-command 90 '{"execute":"guest-fsfreeze-status"}'

{"return":"frozen"}

thaw（解封）文件系统

# virsh qemu-agent-command 90 '{"execute":"guest-fsfreeze-thaw"}'

{"return":1}

thaw后，文件系统为解封状态

# virsh qemu-agent-command 90 '{"execute":"guest-fsfreeze-status"}'

{"return":"thawed"}

三、OpenStack中适配

设置镜像元数据（kilo以后版本都支持）

# nova image-meta 9010b84d-a223-4ece-83e5-09848we45645 set hw_qemu_guest_agent=yes

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