openstack 虚机 卸载/挂载 系统卷

admin

调用 nova    volume-detach  <server>  <volume>  可以卸载云主机已挂载的云硬盘
但是如过卸载云主机的系统卷时会报如下错误：
ERROR (Forbidden): Can't detach root device volume (HTTP 403)

% d5 d3 o4 ~( _5 u& b! H如果想要卸载掉系统卷，可按如下步骤操作：
1.cinder数据库中更改系统卷的mountpoint （系统卷的默认挂载点为/dev/vda）
use cinder;
+ l6 n+ e' ~$ K5 d% yupdate volume_attachment set mountpoint='/dev/vdb' where volume_id = 'oldVolumeId' and deleted = 0;

2.nova数据库中更改系统卷的device_name（系统卷默认为/dev/vda） 和 启动顺序boot_index（系统卷默认为0）
说明：basically the mountpoint/device name must not be /dev/vda and boot_index must not be 0. If this is true, you can successfully remove the volume 。
use nova;
% Z1 e6 `: u5 [* I# A, F- }update block_device_mapping set device_name = '/dev/vdb', boot_index=1 where volume_id = 'oldVolumeId' and deleted = 0;
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0 |' ?0 ]( q. p7 }3.在做完以上2步后再去卸载系统卷就可以了
nova volume-detach <instanceId> <volumeId>.
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**************************************************************************
4 R! l- R  a! e' N# H5 G说明：To attach another volume, do the same thing in reverse after having used nova volume-attach. That is, set the name back to /dev/vda and set the boot_index to 0 for the new volume
同样的道理想要挂载系统卷可按如下步骤操作：
1.设置系统卷的挂载点
use cinder;
update volume_attachment set mountpoint='/dev/vda' where volume_id = 'shinyNewVolumeId' and deleted = 0;
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$ D0 i( `0 b0 O$ h" M, Z8 P2 w2.设置块设备映射名称和启动顺序
2 T# Z6 R! l' V" _2 P! Wuse nova;
8 R, W, p; `+ ^1 o4 Wupdate block_device_mapping set device_name = '/dev/vda', boot_index=0 where volume_id = 'shinyNewVolumeId' and deleted = 0;
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3.为正在创建的实例强制生成一个新的和正确的libvirt配置
9 c* \( {: F8 V4 r8 bnova reboot --hard <instanceId>

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