similar to: a question about xenstore watch function

I''m looking at building a xenstore-based watchdog, as described at http://lists.xensource.com/archives/html/xen-users/2005-07/msg00597.html However, being somewhat new to xenstore, I''d appreciate some pointers. - What portions of the xenstore namespace should I use? I''m looking for at least two settings writable by the DomUs: A flag to enable/disable the watchdog

Hey everyone, I''m trying to write a simple python program in dom0 that registers a watch on the xenstore to determine when a domU has shutdown. Is there a particular token I should use? Looking through the tools/python/xen/*.py code, I''ve come across the ''control/shutdown'' token... seems promising? My code is attached below. As is, if fails to call the

Hi, every one: I had problem creating domU on diskless device by using xen-unstable. Following, please find out details. BTW, the same configuration works fine on device with hard disk (1) Xen, dom0 kernel and dom0 root file system are loaded/mounted over via eth0 (2) DomU root file system is created in a file-backed virtual block device(VBD). The file-backed VBD locates at some directory on

Hello All, I am trying to set up a watch on xentore. According to the documentation xenstore.txt a watch is simply done with the path to the node that the path is going to set, but according to the definitive guide to xen, it is done like a write, path to node and key to be watched. I have tried both and both fail. Probably I have something wrong but it helps to know the correct format. Which

Hey all, Can anyone give me pointers on how (or whether it''s possible) to set up a watch on an item in the xenstore from a userspace program in domU? Any help would be greatly appreciated. Thanks! ~Dave ____________________________________________________________________________________ Need a quick answer? Get one in minutes from people who know. Ask your question on

Hi, Is there a way to change the permission for a specific path in XenStore? And can you do that from with in a C program? Thanks Julian _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

Hi I tried building xen on my IA64 machine. It builds and installs smoothly. But I have not been able to start xend. I get the error in /var/log/xen/xend.log as below: [2007-06-14 05:02:01 xend 26504] WARNING (XendAuthSessions:27) python-pam is required for XenAPI support. [2007-06-14 05:02:01 xend 26520] INFO (SrvDaemon:322) Xend Daemon started [2007-06-14 05:02:01 xend 26520] INFO

Hello, This patch allows userspace tools on a domU to setup a watch on the xenstore. It does this by intercepting XS_WATCH requests written to /proc/xen/xenbus and then re-submitting the request to the in-kernel xenstore interface, in linux-2.6-xen-sparse/drivers/xen/xenbus/xenbus_xs.c. When a callback occurs, an in-kernel function is invoked, which then reconstructs a response in the format

Hello, I build and installed Xen (4.1.3) from source, and I think I have got it working. Well, almost. I am using unmodified kernel of Fedora16 as my dom0 kernel. So this is what happened. I am able to boot into Xen, but the "xl info" failed with the standard error message mentioned in the tutorial. "libxl: error: libxl.c:56:libxl_ctx_init Is xenstore daemon running? failed to

Hello, I build and installed Xen (4.1.3) from source, and I think I have got it working. Well, almost. I am using unmodified kernel of Fedora16 as my dom0 kernel. So this is what happened. I am able to boot into Xen, but the "xl info" failed with the standard error message mentioned in the tutorial. "libxl: error: libxl.c:56:libxl_ctx_init Is xenstore daemon running? failed to

Dear xen-devel, There''s a race condition in xenfs (xenstore driver) that causes userspace utility xenstore-watch to crash. Normally, the userspace process gets an "OK" from xenfs and then the watch fires immediately after. Occasionally, this happens the other way around: the watch fires before the driver sends "OK", which confuses the xenstore-watch client. It seems

Hello: I just gave 3 tries at compiling a xen kernel. I managed to get the networking in the host to work ok on the third try, unfortuately xend gives me the following errors in my xend.log and will not start. Any ideas? It fails to start with the following error ---------------------------------------------------- /usr/sbin/xend [root@localhost ~]# /usr/sbin/xend start Traceback (most recent

# HG changeset patch # User Rusty Russell <rusty@rustcorp.com.au> # Node ID ba5d5bd28edf8bce89bdf9fc64047ee4f1dceded # Parent d4ab9ac93104a13a09ebfaa2384281c4e3392e3f Fix bug where watch messages didn''t go out to domains, causing them to get stuck. Also, change xs_test to more closely reflect xenbus behaviour to exhibit bug. Signed-off-by: Rusty Russell

# HG changeset patch # User Rusty Russell <rusty@rustcorp.com.au> # Node ID b0de1894df67ac7c7d905bf61cdf0210b42752cc # Parent ba5d5bd28edf8bce89bdf9fc64047ee4f1dceded Xenstore watch rework Change watches to all fire simultaneously, removing priority argument. Watches no longer fired back to connection/domain which caused event. Fix up testsuite to match Use state enum, rather than return

Hi,     I use follow code get xenstore ring and event channel, then i wrapped writing and reading function to operate it ,but it came to oops:     struct xenstore_domain_interface {     char req[XENSTORE_RING_SIZE]; /* Requests to xenstore daemon. */     char rsp[XENSTORE_RING_SIZE]; /* Replies and async watch events. */     XENSTORE_RING_IDX req_cons, req_prod;     XENSTORE_RING_IDX rsp_cons,

Hi, for debugging purposes I would like to see the existing xenstore watches and the waiters for the watch. The problem is, we got a EEXIST from xenstored while trying to set a watch from our guest. Is there a possibility to see this on the running xenstored? Thanks. Dietmar. -- Company details: http://ts.fujitsu.com/imprint.html

The entries in xenstore have permission attributes. The attributes can be easily altered by xenstore-chmod, however, I cannot find a easy way to see them. I''ve modified xenstore_client.c to raise a new utility. The utility checks the permission and makes an easy-look output. Please tell me any suggestions. Thanks. Signed-off-by: Frank Pan <frankpzh@gmail.com> ---

Hi, I wondered why the pages on the Wiki are immutable?? The page http://wiki.xensource.com/xenwiki/XenStoreReference contains an errorneous Python example and I want to correct it. Does anybody have access to the Wiki? (and yes, I just created an account) Cheers Andreas _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com

I understand that "xenstore-chmod XENSTOREPATH perm" will allow xenstore access to each other domains according to the permissions set. But if I need to permit access to a specific domain which will avoid a global permit access, is there a way? Thx, Venkat _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com

Hi, I am writing a small application to watch for xenstore events. I want to know when a specific domain shutdown or reboot. It is best to watch it via xenbus interface, but how? Is there any event or node can give me such an event? If not, I must periodically scan the domains (using libxc interface) to detect if a domain dies, but that is not as good as xenbus approach. Many thanks. Hieu