Hi,   when i try to start the Resource Manager i'm getting a error that i pasted at the end of the message. Using Debian 8 in VirtualBox.   I was following this: http://www.cloudera.com/content/cloudera/en/documentation/core/latest/topics/cdh_ig_cdh5_install.html   Any suggestions what i'm missing here? Have no idea what connection does the http server have with resource manager.   This all the data i could collect about this:   root@debian8Node2:~# service hadoop-yarn-resourcemanager restart Job for hadoop-yarn-resourcemanager.service failed. See 'systemctl status hadoop-yarn-resourcemanager.service' and 'journalctl -xn' for details. root@debian8Node2:~# systemctl status hadoop-yarn-resourcemanager.service ● hadoop-yarn-resourcemanager.service - LSB: Hadoop resourcemanager    Loaded: loaded (/etc/init.d/hadoop-yarn-resourcemanager)    Active: failed (Result: exit-code) since Thu 2015-07-16 12:14:41 BST; 13s ago   Process: 1094 ExecStop=/etc/init.d/hadoop-yarn-resourcemanager stop (code=exited, status=0/SUCCESS)   Process: 1144 ExecStart=/etc/init.d/hadoop-yarn-resourcemanager start (code=exited, status=1/FAILURE) Jul 16 12:14:35 debian8Node2 su[1176]: Successful su for yarn by root Jul 16 12:14:35 debian8Node2 su[1176]: + ??? root:yarn Jul 16 12:14:35 debian8Node2 su[1176]: pam_unix(su:session): session opened for user yarn by (uid=0) Jul 16 12:14:35 debian8Node2 hadoop-yarn-resourcemanager[1144]: starting resourcemanager, logging to /var/log/hadoop-yarn/yarn-yarn-resourcemanager-debian8Node2.out Jul 16 12:14:41 debian8Node2 hadoop-yarn-resourcemanager[1144]: Failed to start Hadoop resourcemanager. Return value: 1 ... failed! Jul 16 12:14:41 debian8Node2 systemd[1]: hadoop-yarn-resourcemanager.service: control process exited, code=exited status=1 Jul 16 12:14:41 debian8Node2 systemd[1]: Failed to start LSB: Hadoop resourcemanager. Jul 16 12:14:41 debian8Node2 systemd[1]: Unit hadoop-yarn-resourcemanager.service entered failed state. root@debian8Node2:~# journalctl -xn -- Logs begin at Thu 2015-07-16 07:45:17 BST, end at Thu 2015-07-16 12:17:01 BST. -- Jul 16 12:14:35 debian8Node2 su[1176]: pam_unix(su:session): session opened for user yarn by (uid=0) Jul 16 12:14:35 debian8Node2 hadoop-yarn-resourcemanager[1144]: starting resourcemanager, logging to /var/log/hadoop-yarn/yarn-yarn-resourcemanager-debian8Node2.out Jul 16 12:14:36 debian8Node2 su[1176]: pam_unix(su:session): session closed for user yarn Jul 16 12:14:41 debian8Node2 hadoop-yarn-resourcemanager[1144]: Failed to start Hadoop resourcemanager. Return value: 1 ... failed! Jul 16 12:14:41 debian8Node2 systemd[1]: hadoop-yarn-resourcemanager.service: control process exited, code=exited status=1 Jul 16 12:14:41 debian8Node2 systemd[1]: Failed to start LSB: Hadoop resourcemanager. -- Subject: Unit hadoop-yarn-resourcemanager.service has failed -- Defined-By: systemd -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel -- -- Unit hadoop-yarn-resourcemanager.service has failed. -- -- The result is failed. Jul 16 12:14:41 debian8Node2 systemd[1]: Unit hadoop-yarn-resourcemanager.service entered failed state. Jul 16 12:17:01 debian8Node2 CRON[1426]: pam_unix(cron:session): session opened for user root by (uid=0) Jul 16 12:17:01 debian8Node2 CRON[1427]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly) Jul 16 12:17:01 debian8Node2 CRON[1426]: pam_unix(cron:session): session closed for user root     Ths from the /var/log/hadoop-yarn/yarn-yarn-resourcemanager-debian8Node2.log, pasted only the exception part 2015-07-16 12:14:36,927 INFO org.apache.hadoop.http.HttpServer2: adding path spec: /ws/* 2015-07-16 12:14:36,933 INFO org.apache.hadoop.http.HttpServer2: Jetty bound to port 8088 2015-07-16 12:14:37,287 INFO org.apache.hadoop.service.AbstractService: Service ResourceManager failed in state STARTED; cause: org.apache.hadoop.yarn.webapp.WebAppException: Error starting http server org.apache.hadoop.yarn.webapp.WebAppException: Error starting http server         at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:278)         at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.startWepApp(ResourceManager.java:983)         at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStart(ResourceManager.java:1083)         at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193)         at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1215) Caused by: java.io.IOException: Problem in starting http server. Server handlers failed         at org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:841)         at org.apache.hadoop.yarn.webapp.WebApps$Builder.start(WebApps.java:273)         ... 4 more ... View more