设置pika的连接socket_time参数超时时间长一些，例如1s:
connection = pika.BlockingConnection(pika.ConnectionParameters(host='10.17.1.226',port=5672,credentials=cred,socket_timeout=1))
显然我的原因是，我没有安装abbitmq-server.
# pip3 install rabbitmq  //仍然不行！！
5762这个port如何打开呢？就是rabbitmq-server如何启动呢？我在一台服务器上面安装吧。47.95.235.167
root ~ $ apt-get install rabbitmq-server
Reading package lists... Done
Building dependency tree
Reading state information... Done
rabbitmq-server is already the newest version (3.5.7-1ubuntu0.16.04.2).
0 upgraded, 0 newly installed, 0 to remove and 96 not upgraded.
root ~ $
启动rabbitmq web服务：
2.远程访问rabbitmq:自己增加一个用户，步骤如下：
l1.  创建一个admin用户：sudo rabbitmqctl add_user admin 123123
l2.  设置该用户为administrator角色：sudo rabbitmqctl set_user_tags admin administrator
l3.  设置权限：sudo rabbitmqctl  set_permissions  -p  '/'  admin '.' '.' '.'
l4.  重启rabbitmq服务：sudo service rabbitmq-server restart
之后就能用admin用户远程连接rabbitmq server了。 这就是exchanger的服务安装和启动过程。
结果还是不行！连接超时，我估计是阿里云限制了port=5672的连接请求。添加port放行后，如下：
[root@izwz9jay6aqdkrnnlgscchz project]# service rabbitmq-server restart
Redirecting to /bin/systemctl restart rabbitmq-server.service
[root@izwz9jay6aqdkrnnlgscchz project]# rabbitmqctl add_user admin 123123
Creating user "admin" ...
...done.
[root@izwz9jay6aqdkrnnlgscchz project]# rabbitmqctl set_user_tags admin administrator
Setting tags for user "admin" to [administrator] ...
...done.
[root@izwz9jay6aqdkrnnlgscchz project]# sudo rabbitmqctl  set_permissions  -p  '/'  admin '.' '.' '.'
Setting permissions for user "admin" in vhost "/" ...
...done.
[root@izwz9jay6aqdkrnnlgscchz project]#
这样就可以了。