core.py 文件源码

def ssh_connect(host, timeout=10):
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    error_message = None
    try:
        ssh.connect(host, username='root', key_filename=SSH_KEY_FILENAME,
                    timeout=timeout)
    except (AuthenticationException, SSHException) as e:
        error_message =\
            '{0}.\nCheck hostname, check that user from which '.format(e) +\
            'Kuberdock runs (usually nginx) has ability to login as root on ' \
            'this node, and try again'
    except socket.timeout:
        error_message = 'Connection timeout({0} sec). '.format(timeout) +\
                        'Check hostname and try again'
    except socket.error as e:
        error_message =\
            '{0} Check hostname, your credentials, and try again'.format(e)
    except IOError as e:
        error_message =\
            'ssh_connect: cannot use SSH-key: {0}'.format(e)
    return ssh, error_message