HP BL680c XenServer Software Development Kit Guide 4.1.0 - Page 26

Using the API, function examines each running VM in the system, taking care to filter out

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Using the API import sys, time import XenAPI Next the commandline arguments containing a server URL, username, password and a number of iterations are parsed. The username and password are used to establish a session which is passed to the function main, which is called multiple times in a loop. Note the use of try: finally: to make sure the program logs out of its session at the end. if __name__ == "__main__": if len(sys.argv) 5: print "Usage:" print sys.argv[0], " " sys.exit(1) url = sys.argv[1] username = sys.argv[2] password = sys.argv[3] iterations = int(sys.argv[4]) # First acquire a valid session by logging in: session = XenAPI.Session(url) session.xenapi.login_with_password(username, password) try: for i in range(iterations): main(session, i) finally: session.xenapi.session.logout() The main function examines each running VM in the system, taking care to filter out control domains (which are part of the system and not controllable by the user). A list of running VMs and their current hosts is constructed. def main(session, iteration): # Find a non-template VM object all = session.xenapi.VM.get_all() vms = [] hosts = [] for vm in all: record = session.xenapi.VM.get_record(vm) if not(record["is_a_template"]) and \ not(record["is_control_domain"]) and \ record["power_state"] == "Running": vms.append(vm) hosts.append(record["resident_on"]) print "%d: Found %d suitable running VMs" % (iteration, len(vms)) Next the list of hosts is rotated: 20

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Using the API
20
import sys, time
import XenAPI
Next the commandline arguments containing a server URL, username, password and a number of iterations
are parsed. The username and password are used to establish a session which is passed to the function
main
, which is called multiple times in a loop. Note the use of
try: finally:
to make sure the program
logs out of its session at the end.
if __name__ == "__main__":
if len(sys.argv) <> 5:
print "Usage:"
print sys.argv[0], " <url> <username> <password> <iterations>"
sys.exit(1)
url = sys.argv[1]
username = sys.argv[2]
password = sys.argv[3]
iterations = int(sys.argv[4])
# First acquire a valid session by logging in:
session = XenAPI.Session(url)
session.xenapi.login_with_password(username, password)
try:
for i in range(iterations):
main(session, i)
finally:
session.xenapi.session.logout()
The
main
function examines each running VM in the system, taking care to filter out
control domains
(which
are part of the system and not controllable by the user). A list of running VMs and their current hosts is
constructed.
def main(session, iteration):
# Find a non-template VM object
all = session.xenapi.VM.get_all()
vms = []
hosts = []
for vm in all:
record = session.xenapi.VM.get_record(vm)
if not(record["is_a_template"]) and \
not(record["is_control_domain"]) and \
record["power_state"] == "Running":
vms.append(vm)
hosts.append(record["resident_on"])
print "%d: Found %d suitable running VMs" % (iteration, len(vms))
Next the list of hosts is rotated: