无法通过boto使用亚马逊命令行shell
我正在尝试创建一个实例并通过ssh登录到服务器，我在按照一本书上的例子操作：
import os
import time
import boto
import boto.manage.cmdshell
def launch_instance(ami="ami-54cf5c3d",
instance_type="t1.micro",
key_name="paws",
key_extension=".pem",
key_dir="~/.ssh",
group_name="paws",
ssh_port="22",
cidr="0.0.0.0/0",
tag="paws",
user_data=None,
cmd_shell=True,
login_user="ec2-user",
ssh_passwd=None):
cmd=None
ec2 = boto.connect_ec2() # Crededentials are stored in /etc/boto.cfg
try:
ec2.get_all_key_pairs(keynames=[key_name])[0]
except ec2.ResponseError, e:
if e.code == 'InvalidKeyPair.NotFound':
print 'Creating keypair %s' % key_name
key = ec2.create_key_pair(key_name)
key.save(key_dir)
else:
raise
try:
group = ec2.get_all_security_groups(groupnames=[group_name])[0]
except ec2.ResponseError, e:
if e.code == 'InvalidGroup.NotFound':
print 'Creating security group %s' % group_name
group = ec2.create_security_group(group_name,
'A group that allows SSH access')
else:
raise
try:
group.authorize('tcp',ssh_port,ssh_port,cidr)
except ec2.ResponseError, e:
if e.code == 'InvalidPermission.Duplicate':
print 'Security group %s already authorized' % group_name
else:
raise
reservation = ec2.run_instances(ami,
key_name=key_name,
security_groups=[group_name],
instance_type=instance_type,
user_data=user_data)
instance = reservation.instances[0]
print 'waiting for instance...'
while instance.state != 'running':
time.sleep(5)
instance.update()
print 'Instance is now running'
print 'Instance IP is %s' % instance.ip_address
instance.add_tag(tag)
if cmd_shell:
key_path = os.path.join(os.path.expanduser(key_dir),
key_name + key_extension)
cmd = boto.manage.cmdshell.sshclient_from_instance(instance,
key_path,
user_name=login_user)
return (instance, cmd)
launch_instance()
这是我得到的输出：
root@johntheripper-PORTEGE-Z835:~/boto# python ec2_launch_test.py
Security group paws already authorized
waiting for instance...
Instance is now running
SSH Connection refused, will retry in 5 seconds
SSH Connection refused, will retry in 5 seconds
SSH Connection refused, will retry in 5 seconds
SSH Connection refused, will retry in 5 seconds
SSH Connection refused, will retry in 5 seconds
Could not establish SSH connection
从最后一行可以看出，有些地方出错了。我在想可能是权限的问题，但即使我以root身份运行，情况也没有改变。
不过，我可以通过 ssh -i ........ ec2-user@..... 连接到这个实例。你能告诉我我哪里做错了吗？
2 个回答
3
我觉得一个更好的办法是实际去检查一下这个实例，看看它的ssh服务器是否准备好了，然后再继续进行后面的操作。
def poll_ssh(reservation):
# check if it is ready for ssh
print '\nConnecting to ssh'
for instance in reservation.instances:
retry = True
while retry:
try:
key_path = os.path.join(os.path.expanduser(KEY_DIR), KEY_NAME)
key_path += '.pem'
cmd = boto.manage.cmdshell.sshclient_from_instance(instance, key_path, user_name='ubuntu')
#print 'debug: %s' % cmd
if cmd:
retry = False #breaks the while loop once cmdshell returns true
cmd = None
print 'Connected to', instance
except:
time.sleep(5) # Let the sshd start up
print 'Done\n'
2