hi I am installing CDH4.4 on Centos 6.3 (visual machine , 2vcpu/2GB MEM/20GB) using Cloudera Manager through installation path A, I have two problems which has troubled me for a long time: 1¡¢ The first implementation of the "create a temporary directory" will always fail ,no exception log in the /var/run/cloudera-scm-agent/process/17-hdfs-NAMENODE-createtmp/logs/stderr.log , I usually try again later will be successful . I refer to the relevant information in https://groups.google.com/a/cloudera.org/forum/#!topic/cdh-user/jlgfjQy56So ,and add 127.0.1.1 to my /etc/hosts,but the fault is still in the first time. 2¡¢When I perform to the 'starting Cloudera Management Services' step , my visual machine continued high IOPS ,this cause the virtual machine stop responding and unable to complete the following installation.   I execute the command "vmstat 2" ,that found more than 30 processes are waiting for the CPU scheduling and the following errors were found in /var/log/cloudera-scm-agent/cloudera-scm-agent.log   03/Oct/2013 21:07:23 +0000] 32181 Monitor-HostMonitor throttling_logger ERROR    (315 skipped) Failed to collect java-based DNS names Traceback (most recent call last):   File "/usr/lib64/cmf/agent/src/cmf/monitor/host/dns_names.py", line 53, in collect     result, stdout, stderr = self._subprocess_with_timeout(args, self._poll_timeout)   File "/usr/lib64/cmf/agent/src/cmf/monitor/host/dns_names.py", line 42, in _subprocess_with_timeout     return subprocess_with_timeout(args, timeout)   File "/usr/lib64/cmf/agent/src/cmf/monitor/host/subprocess_timeout.py", line 40, in subprocess_with_timeout     close_fds=True)   File "/usr/lib64/python2.6/subprocess.py", line 639, in __init__     errread, errwrite)   File "/usr/lib64/python2.6/subprocess.py", line 1228, in _execute_child     raise child_exception OSError: [Errno 2] No such file or directory [03/Oct/2013 21:07:50 +0000] 32181 Monitor-DataNodeMonitor abstract_monitor ERROR    Error fetching metrics at 'http://cdh1.jsnewland.com:50075/jmx' Traceback (most recent call last):   File "/usr/lib64/cmf/agent/src/cmf/monitor/abstract_monitor.py", line 252, in collect_metrics_from_url     openedUrl = self.urlopen(url, username=username, password=password)   File "/usr/lib64/cmf/agent/src/cmf/monitor/abstract_monitor.py", line 234, in urlopen     password=password)   File "/usr/lib64/cmf/agent/src/cmf/url_util.py", line 39, in urlopen_with_timeout     return opener.open(url, data, timeout)   File "/usr/lib64/python2.6/urllib2.py", line 391, in open     response = self._open(req, data)   File "/usr/lib64/python2.6/urllib2.py", line 409, in _open     '_open', req)   File "/usr/lib64/python2.6/urllib2.py", line 369, in _call_chain     result = func(*args)   File "/usr/lib64/python2.6/urllib2.py", line 1190, in http_open     return self.do_open(httplib.HTTPConnection, req)   File "/usr/lib64/python2.6/urllib2.py", line 1165, in do_open     raise URLError(err) URLError: <urlopen error timed out> [03/Oct/2013 21:07:50 +0000] 32181 Monitor-NameNodeMonitor abstract_monitor ERROR    Error fetching metrics at 'http://cdh1.jsnewland.com:50070/jmx' Traceback (most recent call last):   File "/usr/lib64/cmf/agent/src/cmf/monitor/abstract_monitor.py", line 252, in collect_metrics_from_url     openedUrl = self.urlopen(url, username=username, password=password)   File "/usr/lib64/cmf/agent/src/cmf/monitor/abstract_monitor.py", line 234, in urlopen     password=password)   File "/usr/lib64/cmf/agent/src/cmf/url_util.py", line 39, in urlopen_with_timeout     return opener.open(url, data, timeout)   File "/usr/lib64/python2.6/urllib2.py", line 391, in open     response = self._open(req, data)   File "/usr/lib64/python2.6/urllib2.py", line 409, in _open     '_open', req)   File "/usr/lib64/python2.6/urllib2.py", line 369, in _call_chain     result = func(*args)   File "/usr/lib64/python2.6/urllib2.py", line 1190, in http_open     return self.do_open(httplib.HTTPConnection, req)   File "/usr/lib64/python2.6/urllib2.py", line 1165, in do_open     raise URLError(err) URLError: <urlopen error timed out> [03/Oct/2013 21:07:56 +0000] 32181 MainThread agent        ERROR    Heartbeating to 192.168.125.135:7182 failed. Traceback (most recent call last):   File "/usr/lib64/cmf/agent/src/cmf/agent.py", line 747, in send_heartbeat     response = self.requestor.request('heartbeat', dict(request=heartbeat))   File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/avro-1.6.3-py2.6.egg/avro/ipc.py", line 145, in request     return self.issue_request(call_request, message_name, request_datum)   File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/avro-1.6.3-py2.6.egg/avro/ipc.py", line 256, in issue_request     call_response = self.transceiver.transceive(call_request)   File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/avro-1.6.3-py2.6.egg/avro/ipc.py", line 485, in transceive     result = self.read_framed_message()   File "/usr/lib64/cmf/agent/build/env/lib/python2.6/site-packages/avro-1.6.3-py2.6.egg/avro/ipc.py", line 489, in read_framed_message     response = self.conn.getresponse()   File "/usr/lib64/python2.6/httplib.py", line 990, in getresponse     response.begin()   File "/usr/lib64/python2.6/httplib.py", line 391, in begin     version, status, reason = self._read_status()   File "/usr/lib64/python2.6/httplib.py", line 349, in _read_status     line = self.fp.readline()   File "/usr/lib64/python2.6/socket.py", line 433, in readline     data = recv(1) timeout: timed out    Although the log display is the connection timed out , but I can still access the URL http://cdh1.jsnewland.com:50075/jmx through Mozilla firework on the host cdh1 , the browser will return some JSON format information.   Thanks. ... 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