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Re: [Xen-API] Xenstore data not getting updated in running VM



Thanks George and Dave for explanation. I was trying to implement a live password reset utility.
I think I'll force VM to reboot which is working  :)

Cheers,
RJ

On Thu, Jan 19, 2012 at 11:47 PM, George Shuklin <george.shuklin@xxxxxxxxx> wrote:

Ah, ok, you didn't mention XenAPI.  Those fields is not a 'real time communication way'. If you need to have it, you need to create your own xenstore-based application to be ran in dom0. Or create xapi plugin for this.

This is not really 'API-like', but my experience (we performs about 100-150 writes/reads per second on every host in cloud) says this is single way to have nice real-time communication with domU via xenstore.

pitfall:
Note that VM can reboot itself (new domain - no 'foreign' data in xenstore). Same for migration - every migration move VM to new domain.


On 19.01.2012 20:33, R J wrote:


On Thu, Jan 19, 2012 at 5:44 PM, George Shuklin <george.shuklin@xxxxxxxxx> wrote:
What 'correct data' you mean? If you write data/foo "bar" from domU you can read them from dom0 as /local/domain/$domid/data/foo

I'm using API VM.add_to_xenstore_data  to add data to a running domU which is reflected in
xe vm-param-get param-name=xenstore-data uuid=UUID_OF_VM but if I do "xenstore-ls data" in domU then it does not reflect the updated/new entries.

If I reboot the domU then it is able to show updated entries with same "xenstore-ls data" command.



On 18.01.2012 18:31, R J wrote:
Hello List,

I'm not able to fetch correct xenstore data in guest. If I reboot the guest then it loads with latest xenstore data but if I change the content of xenstore data while the VM is running then the data does not reflect in guest.

Is this normal or am I missing anything ?


Note: XCP version 1 and guest tools are installed.

- RJ


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