Operations-related content for Windmill.
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windmill-ops/launch/utils.py

75 lines
2.1 KiB

# Copyright (C) 2011-2012 OpenStack LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
#
# See the License for the specific language governing permissions and
# limitations under the License.
import socket
import subprocess
import time
import paramiko
from sshclient import SSHClient
def iterate_timeout(max_seconds, purpose):
start = time.time()
count = 0
while (time.time() < start + max_seconds):
count += 1
yield count
time.sleep(2)
raise Exception("Timeout waiting for %s" % purpose)
def nodescan(ip, port=22, timeout=60):
"""Scan the IP address for public SSH keys.
Returns SSH host key
"""
key = None
output = None
for count in iterate_timeout(
timeout, "connection to %s on port %s" % (ip, port)):
try:
output = subprocess.check_output(
['ssh-keyscan', '-t', 'ed25519', '-p', str(port), str(ip)])
if output:
break
except Exception as e:
print("ssh-keyscan failure: %s", e)
key = output.split()[2].decode('utf8')
return key
def ssh_connect(ip, username, connect_kwargs={}, timeout=60):
# HPcloud may return errno 111 for about 30 seconds after adding the IP
for count in iterate_timeout(timeout, "ssh access"):
try:
client = SSHClient(ip, username, **connect_kwargs)
break
except socket.error as e:
print("While testing ssh access:", e)
time.sleep(5)
except paramiko.ssh_exception.AuthenticationException:
return None
ret, out = client.ssh("echo access okay")
if "access okay" in out:
return client
return None