启动nodemanager出错
解决：
kill 2461sbin/yarn-daemon.sh start resourcemanager
sbin/yarn-daemon.sh start nodemanagerkill 2461的时候resourcemanager也会被kill掉，所以会再启动一下
如果不幸已经启动了nodemanager，因为以为只杀死了nodemanager
此时先关闭nodemanager即可：
sbin/yarn-daemon.sh stop nodemanager[root@hadoop001 hadoop-2.7.1]# sbin/yarn-daemon.sh start resourcemanager
starting resourcemanager, logging to /opt/software/hadoop-2.7.1/logs/yarn-root-resourcemanager-hadoop001.out
[root@hadoop001 hadoop-2.7.1]# sbin/yarn-daemon.sh start nodemanager
starting nodemanager, logging to /opt/software/hadoop-2.7.1/logs/yarn-root-nodemanager-hadoop001.out
root@hadoop001 hadoop-2.7.1]# jps
3200 Jps
1904 DataNode
3076 NodeManager
2824 ResourceManager
1817 NameNode