docker容器启动出错

启动命令：
```
docker run --env db_type=REDIS --env db_host=127.0.0.1 --env db_port=6379 --env db_password=pwd_str -p 50014:5010 jhao104/proxy_pool
```
错误：
```
2020-04-04 21:41:40,653 ProxyManager.py[line:66] ERROR Error 111 connecting to 127.0.0.1:6379. Connection refused.
2020-04-04 21:41:40,653 ProxyManager.py[line:46] INFO ProxyFetch - freeProxy14: start
2020-04-04 21:41:40,740 ProxyManager.py[line:61] INFO ProxyFetch - freeProxy14: 36.248.133.5:9999 success
2020-04-04 21:41:40,741 ProxyManager.py[line:65] ERROR ProxyFetch - freeProxy14: error
2020-04-04 21:41:40,742 ProxyManager.py[line:66] ERROR Error 111 connecting to 127.0.0.1:6379. Connection refused.
2020-04-04 21:41:40,742 ProxyScheduler.py[line:35] INFO finish fetch proxy
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 552, in connect
sock = self._connect()
File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 609, in _connect
raise err
File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 597, in _connect
sock.connect(socket_address)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "proxyPool.py", line 52, in
cli()
File "/usr/local/lib/python3.6/site-packages/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.6/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python3.6/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "proxyPool.py", line 38, in schedule
runScheduler()
File "../Schedule/ProxyScheduler.py", line 48, in runScheduler
rawProxyScheduler()
File "../Schedule/ProxyScheduler.py", line 40, in rawProxyScheduler
doRawProxyCheck()
File "../Schedule/RawProxyCheck.py", line 65, in doRawProxyCheck
for _proxy in pm.db.getAll():
File "../DB/DbClient.py", line 102, in getAll
return self.client.getAll()
File "/usr/src/app/DB/RedisClient.py", line 107, in getAll
item_dict = self.__conn.hgetall(self.name)
File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 2979, in hgetall
return self.execute_command('HGETALL', name)
File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 875, in execute_command
conn = self.connection or pool.get_connection(command_name, **options)
File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 1347, in get_connection
connection.connect()
File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 557, in connect
raise ConnectionError(self._error_message(e))
redis.exceptions.ConnectionError: Error 111 connecting to 127.0.0.1:6379. Connection refused.
```