def create(self, name=None, params=None, root_dir=None, for_migration=False, timeout=5.0):
"""
Start the VM by running a qemu command.
All parameters are optional. The following applies to all parameters
but for_migration: If a parameter is not supplied, the corresponding
value stored in the class attributes is used, and if it is supplied,
it is stored for later use.
@param name: The name of the object
@param params: A dict containing VM params
@param root_dir: Base directory for relative filenames
@param for_migration: If True, start the VM with the -incoming
option
"""
self.destroy()
if name != None:
self.name = name
if params != None:
self.params = params
if root_dir != None:
self.root_dir = root_dir
name = self.name
params = self.params
root_dir = self.root_dir
# Verify the md5sum of the ISO image
iso = params.get("cdrom")
if iso:
iso = kvm_utils.get_path(root_dir, iso)
if not os.path.exists(iso):
logging.error("ISO file not found: %s" % iso)
return False
compare = False
if params.get("md5sum_1m"):
logging.debug("Comparing expected MD5 sum with MD5 sum of " "first MB of ISO file...")
actual_md5sum = kvm_utils.md5sum_file(iso, 1048576)
expected_md5sum = params.get("md5sum_1m")
compare = True
elif params.get("md5sum"):
logging.debug("Comparing expected MD5 sum with MD5 sum of ISO " "file...")
actual_md5sum = kvm_utils.md5sum_file(iso)
expected_md5sum = params.get("md5sum")
compare = True
if compare:
if actual_md5sum == expected_md5sum:
logging.debug("MD5 sums match")
else:
logging.error("Actual MD5 sum differs from expected one")
return False
# Make sure the following code is not executed by more than one thread
# at the same time
lockfile = open("/tmp/kvm-autotest-vm-create.lock", "w+")
fcntl.lockf(lockfile, fcntl.LOCK_EX)
try:
# Handle port redirections
redir_names = kvm_utils.get_sub_dict_names(params, "redirs")
host_ports = kvm_utils.find_free_ports(5000, 6000, len(redir_names))
self.redirs = {}
for i in range(len(redir_names)):
redir_params = kvm_utils.get_sub_dict(params, redir_names[i])
guest_port = int(redir_params.get("guest_port"))
self.redirs[guest_port] = host_ports[i]
# Find available VNC port, if needed
if params.get("display") == "vnc":
self.vnc_port = kvm_utils.find_free_port(5900, 6000)
# Find random UUID if specified 'uuid = random' in config file
if params.get("uuid") == "random":
f = open("/proc/sys/kernel/random/uuid")
self.uuid = f.read().strip()
f.close()
# Make qemu command
qemu_command = self.make_qemu_command()
# Is this VM supposed to accept incoming migrations?
if for_migration:
# Find available migration port
self.migration_port = kvm_utils.find_free_port(5200, 6000)
# Add -incoming option to the qemu command
qemu_command += " -incoming tcp:0:%d" % self.migration_port
logging.debug("Running qemu command:\n%s", qemu_command)
self.process = kvm_subprocess.run_bg(qemu_command, None, logging.debug, "(qemu) ")
if not self.process.is_alive():
logging.error("VM could not be created; " "qemu command failed:\n%s" % qemu_command)
logging.error("Status: %s" % self.process.get_status())
logging.error("Output:" + kvm_utils.format_str_for_message(self.process.get_output()))
self.destroy()
return False
if not kvm_utils.wait_for(self.is_alive, timeout, 0, 1):
logging.error("VM is not alive for some reason; " "qemu command:\n%s" % qemu_command)
self.destroy()
return False
# Get the output so far, to see if we have any problems with
# hugepage setup.
output = self.process.get_output()
if "alloc_mem_area" in output:
logging.error("Could not allocate hugepage memory; " "qemu command:\n%s" % qemu_command)
logging.error("Output:" + kvm_utils.format_str_for_message(self.process.get_output()))
return False
logging.debug("VM appears to be alive with PID %d", self.process.get_pid())
return True
finally:
fcntl.lockf(lockfile, fcntl.LOCK_UN)
lockfile.close()
#!/usr/bin/python """ Program that calculates the md5sum for the first megabyte of a file. It's faster than calculating the md5sum for the whole ISO image. @copyright: Red Hat 2008-2009 @author: Uri Lublin ([email protected]) """ import os, sys import kvm_utils if len(sys.argv) < 2: print 'usage: %s <iso-filename>' % sys.argv[0] else: fname = sys.argv[1] if not os.access(fname, os.F_OK) or not os.access(fname, os.R_OK): print 'bad file name or permissions' else: print kvm_utils.md5sum_file(fname, 1024*1024)
