之前启动都没有问题，今天启动报错了
[root@hadoop001 hadoop-2.7.1]# sbin/hadoop-daemon.sh start resourcemanager
starting resourcemanager, logging to /opt/software/hadoop-2.7.1/logs/hadoop-root-resourcemanager-hadoop001.out
Error: Could not find or load main class resourcemanager
[root@hadoop001 hadoop-2.7.1]# jps
1282 DataNode
1421 Jps
1182 NameNode
[root@hadoop001 hadoop-2.7.1]# sbin/hadoop-daemon.sh start nodemanager
starting nodemanager, logging to /opt/software/hadoop-2.7.1/logs/hadoop-root-nodemanager-hadoop001.out
Error: Could not find or load main class nodemanager
经过仔细分析，原来是自己的启动的文件选择错了，顺手写成了hadoop-daemon.sh，而实际上是yarn-daemon.sh
[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]# jps
1282 DataNode
1812 Jps
1590 ResourceManager
1182 NameNode
[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
1282 DataNode
1590 ResourceManager
1847 NodeManager
1977 Jps
1182 NameNode
怪不得自己的会启动不了