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[Libvir] virDomainDump() API (equivalent to xm dump) in libvirt?



There's already one for saving live domains:

int virDomainSave(virDomainPtr domain, const char *to);

Why not use a similar API for a function which does the equivalent of
'xm dump' ?

int virDomainDump(virDomainPtr domain, const char *to, int flags);

Create a kernel dump of the domain in the path contained in *to.  This
API must fail if the domain is not in a panicked/crashed state.

If you set the lowest-bit in flags, however, you can override this
behavior: if the lowest bit is set, the domain will first be crashed
(similar to SysRq-C) - then a dump will be taken from that.


Why?

In the event that a cluster node needs to fence a Xen domain (or other
management tools, to be sure), we could use the API to generate a core
of the domain (if it panicked) to help debug the problem prior to
restarting the domain.

The 'crash-before-dump' bit is just something someone might want to use
at some point; I don't think it is absolutely necessary - but it doesn't
hurt anything either.

-- Lon



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