TCP migration or TCP handoff on XEN

TCP migration or TCP handoff on XEN

[Rick]

Hello,

Has there been any attempt to perform some form of TCP migration or
TCP handoff on XEN ? That is suppose I have two instances of XenoLinux
running some services. If the primary XenoLinux goes down then the
secondary XenoLinux takes over and the TCP connection states are
preserved as they are transfered from the primary XenoLinux to the
secondary XenoLinux. For the client everything happens transparently
and no interruption of the service is observed. Has anyone attempted
that ? Or does XEN offer some services to facilitate that instead of
starting from scratch ?

Thanks
Rick


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Re: TCP migration or TCP handoff on XEN

[Tim Freeman]

On Tue, 18 Jan 2005 15:14:46 -0500
Rick <judicator3@gmail.com> wrote:

> Hello,
> 
> Has there been any attempt to perform some form of TCP migration or
> TCP handoff on XEN ? 

In a sense this is just like live migration if I understand.  If you
migrate a domain to a new machine and assume the IP address there (with
an unsolicited ARP broadcast), a TCP connection will continue
transparently -- as long as the routing is worked out (i.e.,
intra-cluster migration will work like this without a special
framework). 

> That is suppose I have two instances of XenoLinux
> running some services. If the primary XenoLinux goes down then the
> secondary XenoLinux takes over and the TCP connection states are
> preserved as they are transfered from the primary XenoLinux to the
> secondary XenoLinux. 

There were a number of interesting conversations about this type of
fallover recently, 

cf.
http://thread.gmane.org/gmane.comp.emulators.xen.devel/4729
http://thread.gmane.org/gmane.comp.emulators.xen.devel/5329
http://thread.gmane.org/gmane.comp.emulators.xen.devel/4893

> For the client everything happens transparently
> and no interruption of the service is observed. Has anyone attempted
> that ? Or does XEN offer some services to facilitate that instead of
> starting from scratch ?
> 
> Thanks
> Rick
> 
> 
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