报错：Heartbeating to master:7182 failed.

报错背景：

cloudera-scm-agent 可以启动并且存活，但是jps没有进程。

报错现象：

查看报错日志：/opt/cm-5.15.1/log/cloudera-scm-agent/cloudera-scm-agent.log

[/Apr/ :: +]  MainThread throttling_logger INFO     ( skipped) Identified java component java8 with full version java version "1.8.0_191" Java(TM) SE Runtime Environment (build 1.8.0_191-b12) Java HotSpot(TM) -Bit Server VM (build 25.191-b12, mixed mode)  for requested version .
[/Apr/ :: +]  MainThread agent        ERROR    Heartbeating to master: failed.
Traceback (most recent call last):
  File "/opt/cm-5.15.1/lib64/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.15.1-py2.7.egg/cmf/agent.py", line , in _send_heartbeat
    response = self.requestor.request('heartbeat', heartbeat_data)
  File "/opt/cm-5.15.1/lib64/cmf/agent/build/env/lib/python2.7/site-packages/avro-1.6.3-py2.7.egg/avro/ipc.py", line , in request
    return self.issue_request(call_request, message_name, request_datum)
  File "/opt/cm-5.15.1/lib64/cmf/agent/build/env/lib/python2.7/site-packages/avro-1.6.3-py2.7.egg/avro/ipc.py", line , in issue_request
    call_response = self.transceiver.transceive(call_request)
  File "/opt/cm-5.15.1/lib64/cmf/agent/build/env/lib/python2.7/site-packages/avro-1.6.3-py2.7.egg/avro/ipc.py", line , in transceive
    result = self.read_framed_message()
  File "/opt/cm-5.15.1/lib64/cmf/agent/build/env/lib/python2.7/site-packages/avro-1.6.3-py2.7.egg/avro/ipc.py", line , in read_framed_message
    response = self.conn.getresponse()
  File "/usr/lib64/python2.7/httplib.py", line , in getresponse
    response.begin()
  File "/usr/lib64/python2.7/httplib.py", line , in begin
    version, status, reason = self._read_status()
  File "/usr/lib64/python2.7/httplib.py", line , in _read_status
    raise BadStatusLine(line)
BadStatusLine: ''
[/Apr/ :: +]  MainThread agent        ERROR    Heartbeating to master: failed.
Traceback (most recent call last):
  File "/opt/cm-5.15.1/lib64/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.15.1-py2.7.egg/cmf/agent.py", line , in _send_heartbeat
    self.master_port)
  File "/opt/cm-5.15.1/lib64/cmf/agent/build/env/lib/python2.7/site-packages/avro-1.6.3-py2.7.egg/avro/ipc.py", line , in __init__
    self.conn.connect()
  File "/usr/lib64/python2.7/httplib.py", line , in connect
    self.timeout, self.source_address)
  File "/usr/lib64/python2.7/socket.py", line , in create_connection
    raise err
error: [Errno ] Connection refused
[/Apr/ :: +]  MainThread agent        INFO     Stopping agent...

报错日志

报错原因：

报错信息：ERROR    Heartbeating to master:7182 failed。

错误解释：向master节点的指定端口7180发送心跳检测失败。

首次启动Agent，它会生成一个uuid，路径为：/opt/cm-5.1.3/lib/cloudera-scm-agent/uuid,如果每台机器上的Agent的uuid都是一样，就会出现报错情况。

报错解决：

进入目录：cd /opt/cm-5.15.1/lib/cloudera-scm-agent/

删除uuid：rm -rf uuid

重启agent：/opt/cm-5.15.1/etc/init.d/cloudera-scm-agent restart