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：
& `  p7 r  z! C8 P2 SERROR (Forbidden): Can't detach root device volume (HTTP 403)

如果想要卸载掉系统卷，可按如下步骤操作：
1 i- Q$ |3 C. s; L/ c! u1.cinder数据库中更改系统卷的mountpoint （系统卷的默认挂载点为/dev/vda）
/ J+ k) _7 f6 d- g% c, O1 Juse cinder;
update volume_attachment set mountpoint='/dev/vdb' where volume_id = 'oldVolumeId' and deleted = 0;
9 m/ k, P' @2 D& T4 |  u5 c! d
: j# N9 K# }3 ]' c8 z$ m7 \* N, ?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 。
; G9 @" h8 s! x1 r/ \use nova;
update block_device_mapping set device_name = '/dev/vdb', boot_index=1 where volume_id = 'oldVolumeId' and deleted = 0;
" K9 p4 H, g$ d; W, R+ J
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>.

# L! S7 x, ^* t9 y. _/ p3 Q" i**************************************************************************
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
" C- l# |; ]6 c" v1 |, D同样的道理想要挂载系统卷可按如下步骤操作：
; Y, `4 r! j$ @0 b+ Z1.设置系统卷的挂载点
use cinder;
2 h0 C; t/ {, p) B: tupdate volume_attachment set mountpoint='/dev/vda' where volume_id = 'shinyNewVolumeId' and deleted = 0;

2.设置块设备映射名称和启动顺序
; k- i/ v- S8 e" h7 Y' O% cuse nova;
update block_device_mapping set device_name = '/dev/vda', boot_index=0 where volume_id = 'shinyNewVolumeId' and deleted = 0;

/ S3 S3 w7 ?6 f9 j, o3.为正在创建的实例强制生成一个新的和正确的libvirt配置
! @/ @- j( w/ ~3 F7 gnova reboot --hard <instanceId>



/ `4 {' p: M0 i; C2 N