Difference between revisions of "XenStore"
From Christoph's Personal Wiki
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$ xenstore-ls /local/domain/123 | $ xenstore-ls /local/domain/123 | ||
| − | * View the domain data for a given DOMID (note that the "host" is empty and the "guest" is not. | + | * View the domain data for a given DOMID (note that the "host" value is empty and the "guest" is not. This is what one should see): |
<pre> | <pre> | ||
$ xenstore-ls /local/domain/123/data | $ xenstore-ls /local/domain/123/data | ||
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</pre> | </pre> | ||
| − | * This is what the above output should | + | * This is what the above output should '''not''' look like (note that the output does not have the "guest" entries): |
<pre> | <pre> | ||
$ xenstore-ls /local/domain/399/data | $ xenstore-ls /local/domain/399/data | ||
Revision as of 05:34, 22 March 2015
This article will cover XenStore-related topics and CLI examples.
WARNING: The majority of these commands are meant to be run on the hypervisor/host. Unless otherwise noted, they should not be run on a guest VM (or Cloud Server).
XenStore commands to be run on hypervisor/host
- View all domain information for a given DOMID:
$ xenstore-ls /local/domain/123
- View the domain data for a given DOMID (note that the "host" value is empty and the "guest" is not. This is what one should see):
$ xenstore-ls /local/domain/123/data
host = ""
meminfo_total = "1022884"
meminfo_free = "181088"
os_name = "Debian GNU/Linux 7.1 (wheezy)"
os_majorver = "7"
os_minorver = "1"
os_uname = "3.2.0-4-amd64"
os_distro = "debian"
updated = "Wed Oct 9 05:41:29 UTC 2013"
guest = ""
127a8ec3-ffff-4d0b-cccc-6f6c03faedf3 = "{"message": "0.0.1.37", "returncode": "0"}"
a1262b0a-ffff-4b39-cccc-7c9c5a341bd4 = "{"message": "120060756033138162104944855769740", "returncode": "D0"}"
5a6df0d1-ffff-4666-cccc-94bae5798776 = "{"message": "", "returncode": "0"}"
dba8667d-ffff-469c-cccc-b46b25fadb8e = "{"message": "", "returncode": "0"}"
- This is what the above output should not look like (note that the output does not have the "guest" entries):
$ xenstore-ls /local/domain/399/data
host = ""
cacbdbd9-ffff-4fd7-cccc-906f15e0f9fd = "{"name":"version","value":"agent"}"
meminfo_total = "1022880"
meminfo_free = "460328"
os_name = "Debian GNU/Linux 7.1 (wheezy)"
os_majorver = "7"
os_minorver = "1"
os_uname = "3.2.0-4-amd64"
os_distro = "debian"
updated = "Wed Oct 9 05:13:43 UTC 2013"
- Check nova-agent version (useful for making sure nova-agent is running on the VM):
$ label=instance-XXXXXXX; uuid=`uuidgen`; domid=$(xe vm-list name-label=$label params=dom-id --minimal); \
xenstore-write /local/domain/$domid/data/host/$uuid '{"name":"version","value":"agent"}'; sleep 10 ; \
xenstore-read /local/domain/$domid/data/guest/$uuid ; unset label; unset uuid; unset domid;
$ #~OR~
$ echo -n 'Enter Name Label : ';read LABEL;DOMID=$(xe vm-list name-label=$LABEL params=dom-id --minimal);\
UUID=$(uuidgen);xenstore-write /local/domain/$DOMID/data/host/$UUID '{"name":"version","value":"agent"}';sleep 5;\
echo -ne "\nxapi reply : "; xenstore-read /local/domain/$DOMID/data/guest/$UUID ; \
xenstore-rm /local/domain/$DOM/data/host/$UUID ; unset LABEL; unset UUID; unset DOMID;
- Re-configure/reset network of VM from host:
$ label=instance-XXXXXXX; uuid=$(uuidgen); domid=$(xe vm-list name-label=$label params=dom-id --minimal); \
xenstore-write /local/domain/$domid/data/host/$uuid '{"name":"resetnetwork","value":""}'; sleep 10 ; \
xenstore-read /local/domain/$domid/data/guest/$uuid ; unset label; unset uuid; unset domid;
Miscellaneous commands
$ xenstore-exists /local/domain/$DOMID/data/guest/${UUID}
$ xenstore-write /local/domain/$DOMID/data/host/${UUID} {"name": "resetnetwork", "value": ""}'
$ xenstore-write /local/domain/$DOMID/data/host/${UUID} {"name": "password", "value": "MY_PASSWORD"}'
$ xenstore-ls /local/domain/$DOMID/PVAddons
$ xenstore-ls /local/domain/$DOMID/vm-data/networking
$ xenstore-read /local/domain/$DOMID/vm-data/networking/$MAC # MAC address from previous command
XenStore commands to be run on guest VM
Note: You can run all of these commands (as root) within a given Rackspace Cloud Server.
$ xenstore-ls data
$ xenstore-read data/os_name
$ xenstore-read data/meminfo_total
$ xenstore-ls vm-data
$ xenstore-list vm-data
$ xenstore-ls vm-data/networking
$ xenstore-read vm-data/networking/${MAC_ADDRESS} # <- Replace with your actual MAC address
$ xenstore-read vm-data/hostname
$ xenstore-read vm-data/provider_data/roles
$ xenstore-read vm-data/provider_data/region
$ xenstore-read name
$ xenstore-read domid
- Advanced lookups:
$ xenstore-ls /local/domain/`xenstore-read domid` $ xenstore-read vm-data/networking/$(xenstore-read device/vif/2/mac|sed 's/://g')|python -mjson.tool $ xenstore-ls /local/domain/`xenstore-read domid` |grep "backend =" $ xenstore-ls -f /local/domain/0/backend/vbd/1207/768 # <- Replace with your actual VBD values $ xenstore-ls -f /local/domain/0/backend/vif/1207/2 # <- Replace with your actual VIF values
