1.linux system for safety reinforcement, modify ssh access to the default port number is 2222
[root@ruozedata001 ~]# vim /etc/ssh/sshd_config
将里面的Port 22 修改为 Port 2222
[root@ruozedata001 ~]#reboot
2. Install hadoop, start hadoop error
[hadoop@ruozedata001 hadoop]$ sbin/start-dfs.sh
19/07/02 09:50:39 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting namenodes on [localhost]
localhost: ssh: connect to host localhost port 22: Connection refused
localhost: ssh: connect to host localhost port 22: Connection refused
Starting secondary namenodes [0.0.0.0]
0.0.0.0: ssh: connect to host 0.0.0.0 port 22: Connection refused
19/07/02 09:50:42 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[hadoop@ruozedata001 hadoop]$
解决方法
[hadoop@ruozedata001 hadoop]$ echo “export HADOOP_SSH_OPTS="-p 2222" >> ~/app/hadoop/etc/hadoop/hadoop-env.sh
And then start the service, the service will be able to properly started, as follows
[hadoop@ruozedata001 hadoop]$ sbin/start-dfs.sh
19/07/02 10:04:20 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting namenodes on [localhost]
localhost: starting namenode, logging to /home/hadoop/software/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-namenode- ruozedata001.out
localhost: starting datanode, logging to /home/hadoop/software/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-datanode-ruozedata001.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /home/hadoop/software/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop- secondarynamenode-ruozedata001.out
19/07/02 10:04:36 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[hadoop@ruozedata001 hadoop]$ jps
3607 NameNode
3911 SecondaryNameNode
3709 DataNode
4062 Jps
[hadoop@ruozedata001 hadoop]$