def _get_ssh_connection(self):
"""Returns an ssh connection to the specified host."""
_timeout = True
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
_start_time = time.time()
while not self._is_timed_out(self.timeout, _start_time):
try:
ssh.connect(self.host,
username=self.username,
password=self.password,
look_for_keys=self.look_for_keys,
key_filename=self.key_filename,
timeout=self.timeout,
pkey=self.pkey)
_timeout = False
break
except socket.error:
continue
except paramiko.AuthenticationException:
time.sleep(5)
continue
if _timeout:
raise exceptions.SSHTimeout(host=self.host,
user=self.username,
password=self.password)
return ssh
def get_ssh_connection(self, host, username, password):
"""Create an SSH connection object to a host"""
ssh_timeout = self.config.compute.ssh_timeout
ssh_client = Client(host, username, password, ssh_timeout)
if not ssh_client.test_connection_auth():
raise exceptions.SSHTimeout()
else:
return ssh_client
def _get_ssh_connection(self, sleep=1.5, backoff=1):
"""Returns an ssh connection to the specified host."""
bsleep = sleep
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
_start_time = time.time()
if self.pkey is not None:
LOG.info(
"Creating ssh connection to '%s' as '%s'"
" with public key authentication", self.host, self.username)
else:
LOG.info(
"Creating ssh connection to '%s' as '%s'"
" with password %s", self.host, self.username,
str(self.password))
attempts = 0
while True:
try:
ssh.connect(self.host,
username=self.username,
password=self.password,
look_for_keys=self.look_for_keys,
key_filename=self.key_filename,
timeout=self.channel_timeout,
pkey=self.pkey)
LOG.info("ssh connection to %s@%s successfuly created",
self.username, self.host)
return ssh
except (socket.error, paramiko.SSHException) as e:
if self._is_timed_out(_start_time):
LOG.exception(
"Failed to establish authenticated ssh"
" connection to %s@%s after %d attempts",
self.username, self.host, attempts)
raise exceptions.SSHTimeout(host=self.host,
user=self.username,
password=self.password)
bsleep += backoff
attempts += 1
LOG.warning(
"Failed to establish authenticated ssh"
" connection to %s@%s (%s). Number attempts: %s."
" Retry after %d seconds.", self.username, self.host, e,
attempts, bsleep)
time.sleep(bsleep)