【OpenStack】源码级深入了解删除虚拟机操作

最新推荐文章于 2022-09-05 18:38:40 发布

转载最新推荐文章于 2022-09-05 18:38:40 发布 · 402 阅读

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原文链接：http://www.cnblogs.com/puyangsky/p/5527441.html

文章标签：

#运维 #python

本文详细解析了虚拟机的多种状态及其在删除过程中的不同操作方式，包括ACTIVE、BUILDING、PAUSED等关键状态，并说明了在删除虚拟机时会根据其状态采取不同的处理策略，如完全释放资源或保留部分资源。

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首先看一下虚拟机有多少种状态：(/nova/compute/vmstates.py)

 1 ACTIVE = 'active'  # VM is running
 2 BUILDING = 'building'  # VM only exists in DB
 3 PAUSED = 'paused'
 4 SUSPENDED = 'suspended'  # VM is suspended to disk.
 5 STOPPED = 'stopped'  # VM is powered off, the disk image is still there.
 6 RESCUED = 'rescued'  # A rescue image is running with the original VM image
 7 # attached.
 8 RESIZED = 'resized'  # a VM with the new size is active. The user is expected
 9 # to manually confirm or revert.
10 
11 SOFT_DELETED = 'soft-delete'  # VM is marked as deleted but the disk images are
12 # still available to restore.
13 DELETED = 'deleted'  # VM is permanently deleted.
14 
15 ERROR = 'error'
16 
17 SHELVED = 'shelved'  # VM is powered off, resources still on hypervisor
18 SHELVED_OFFLOADED = 'shelved_offloaded'  # VM and associated resources are
19 # not on hypervisor
20 
21 ALLOW_SOFT_REBOOT = [ACTIVE]  # states we can soft reboot from
22 ALLOW_HARD_REBOOT = ALLOW_SOFT_REBOOT + [STOPPED, PAUSED, SUSPENDED, ERROR]
23 # states we allow hard reboot from
24 
25 ALLOW_TRIGGER_CRASH_DUMP = [ACTIVE, PAUSED, RESCUED, RESIZED, ERROR]
26 # states we allow to trigger crash dump
27 
28 ALLOW_RESOURCE_REMOVAL = [DELETED, SHELVED_OFFLOADED]
29 # states we allow resources to be freed in