? ? ?啟動agent節點失敗，提示拒絕連接，百度一下很多人說解決方式是用ps -ef | grep supervisord查看是否有進程，有的話 kill 掉（使用kill -9 會自動拉起進程，使用kill），然后重啟即可，kill掉后依然無法啟動

? ?cloudera-scm-agent.log日志文件報錯如下

[01/Apr/2019 16:46:19 +0000] 97874 MainThread supervisor INFO Trying to connect to supervisor (Attempt 1) [01/Apr/2019 16:46:20 +0000] 97874 MainThread supervisor ERROR Failed! trying again in 2 second(s): [Errno 111] Connection refused Traceback (most recent call last):File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/supervisor.py", line 141, in connectobj = cls(cfg, os_ops_obj)File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/supervisor.py", line 88, in __init__self.identifier = self.__get_supervisor_identification()File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/util/__init__.py", line 531, in new_fnreturn fn(self, *args, **kwargs)File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/supervisor.py", line 379, in __get_supervisor_identificationreturn self.client.supervisor.getIdentification()File "/usr/lib64/python2.7/xmlrpclib.py", line 1233, in __call__return self.__send(self.__name, args)File "/usr/lib64/python2.7/xmlrpclib.py", line 1591, in __requestverbose=self.__verboseFile "/opt/cloudera/cm-agent/lib/python2.7/site-packages/supervisor/xmlrpc.py", line 460, in requestself.connection.request('POST', handler, request_body, self.headers)File "/usr/lib64/python2.7/httplib.py", line 1041, in requestself._send_request(method, url, body, headers)File "/usr/lib64/python2.7/httplib.py", line 1075, in _send_requestself.endheaders(body)File "/usr/lib64/python2.7/httplib.py", line 1037, in endheadersself._send_output(message_body)File "/usr/lib64/python2.7/httplib.py", line 881, in _send_outputself.send(msg)File "/usr/lib64/python2.7/httplib.py", line 843, in sendself.connect()File "/usr/lib64/python2.7/httplib.py", line 824, in connectself.timeout, self.source_address)File "/usr/lib64/python2.7/socket.py", line 571, in create_connectionraise err error: [Errno 111] Connection refused [01/Apr/2019 16:46:22 +0000] 97874 MainThread supervisor INFO Trying to connect to supervisor (Attempt 2) [01/Apr/2019 16:46:23 +0000] 97874 MainThread supervisor ERROR Failed! trying again in 2 second(s): [Errno 111] Connection refused Traceback (most recent call last):File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/supervisor.py", line 141, in connectobj = cls(cfg, os_ops_obj)File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/supervisor.py", line 88, in __init__self.identifier = self.__get_supervisor_identification()File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/util/__init__.py", line 531, in new_fnreturn fn(self, *args, **kwargs)File "/opt/cloudera/cm-agent/lib/python2.7/site-packages/cmf/supervisor.py", line 379, in __get_supervisor_identificationreturn self.client.supervisor.getIdentification()File "/usr/lib64/python2.7/xmlrpclib.py", line 1233, in __call__return self.__send(self.__name, args)File "/usr/lib64/python2.7/xmlrpclib.py", line 1591, in __requestverbose=self.__verboseFile "/opt/cloudera/cm-agent/lib/python2.7/site-packages/supervisor/xmlrpc.py", line 460, in requestself.connection.request('POST', handler, request_body, self.headers)File "/usr/lib64/python2.7/httplib.py", line 1041, in requestself._send_request(method, url, body, headers)File "/usr/lib64/python2.7/httplib.py", line 1075, in _send_requestself.endheaders(body)File "/usr/lib64/python2.7/httplib.py", line 1037, in endheadersself._send_output(message_body)File "/usr/lib64/python2.7/httplib.py", line 881, in _send_outputself.send(msg)File "/usr/lib64/python2.7/httplib.py", line 843, in sendself.connect()File "/usr/lib64/python2.7/httplib.py", line 824, in connectself.timeout, self.source_address)File "/usr/lib64/python2.7/socket.py", line 571, in create_connectionraise err error: [Errno 111] Connection refused

后續多次嘗試尋找原因為何拒絕連接，發現防火墻開啟了（iptables），關閉后，重啟服務，成功。

總結一下可能出現agent無法啟動的原因

1、Python文件不匹配；參考http://www.cnblogs.com/lion.net/archive/2014/09/02/3950619.html中_io的設置 2、日志文件不存在，在config.ini中把log_file放開 3、/etc/hosts/中主機和ip配置問題 4、防火墻是否關閉,(iptables/firewall) 5、端口配置，config.ini中端口是否配置的為7182 6、集群時間是否同步，安裝ntp同步時間

根據這次問題發現，異常后只提示連接拒絕，無具體說明，所以防火墻如果必須開啟，請注意各端口開放情況，否則異常排查較為麻煩

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