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vim /etc/profile

 

配置后生效

 

source /etc/profile

export JAVA_HOME=/opt/lagou/servers/jdk1.8.0_231
export PATH=$JAVA_HOME/bin:$PATH

##HADOOP_HOME
export HADOOP_HOME=/opt/lagou/servers/hadoop-2.9.2
export PATH=$PATH:$HADOOP_HOME/bin
export PATH=$PATH:$HADOOP_HOME/sbin

[root@linux121 hadoop-2.9.2]$ hadoop namenode -format

 

格式化后创建的文件：/opt/lagou/servers/hadoop-2.9.2/data/tmp/dfs/name/current

1、单节点启动  

启动HDFS

在linux101上启动NameNode

在linux101、linux102以及linux103上分别启动DataNode

[root@Linux101 hadoop-2.9.2]# hadoop-daemon.sh start namenode

[root@Linux101 hadoop-2.9.2]# hadoop-daemon.sh start datanode

停止
[root@Linux101 hadoop-2.9.2]# hadoop-daemon.sh stop datanode

[root@Linux101 hadoop-2.9.2]# hadoop-daemon.sh stop namenode

[root@Linux101 ~]# cd /opt/lagou/servers/hadoop-2.9.2/
[root@Linux101 hadoop-2.9.2]# hadoop-daemon.sh start namenode
starting namenode, logging to /opt/lagou/servers/hadoop-2.9.2/logs/hadoop-root-namenode-Linux101.out
[root@Linux101 hadoop-2.9.2]# jps
4176 Jps
4099 NameNode
[root@Linux101 hadoop-2.9.2]# hadoop-daemon.sh start datanode
starting datanode, logging to /opt/lagou/servers/hadoop-2.9.2/logs/hadoop-root-datanode-Linux101.out
[root@Linux101 hadoop-2.9.2]# jps
4209 DataNode
4099 NameNode
4291 Jps

web页面访问 通过IP访问
http://192.168.2.128:50070/dfshealth.html#tab-overview

启动Yarn

在103启动Yarn resourcemanager  

分别在101 102 启动 nodemanager   

yarn-daemon.sh start resourcemanager  在103启动

yarn-daemon.sh start nodemanager  分别在101 102 启动

停止

[root@Linux103 hadoop-2.9.2]# yarn-daemon.sh stop resourcemanager

[root@Linux101 hadoop-2.9.2]# yarn-daemon.sh stop nodemanager

[root@Linux103 servers]# yarn-daemon.sh start resourcemanager
starting resourcemanager, logging to /opt/lagou/servers/hadoop-2.9.2/logs/yarn-root-resourcemanager-Linux103.out
[root@Linux103 servers]# jps
2432 Jps
1878 DataNode
2214 ResourceManager

2、集群群起

第一次启动需要格式化

hadoop namenode -format

 

[root@linux101 hadoop-2.9.2]# sbin/start-dfs.sh
Starting namenodes on [linux101]
linux101: starting namenode, logging to /opt/lagou/servers/hadoop-2.9.2/logs/hadoop-root-namenode-linux101.out
linux102: starting datanode, logging to /opt/lagou/servers/hadoop-2.9.2/logs/hadoop-root-datanode-linux102.out
linux103: starting datanode, logging to /opt/lagou/servers/hadoop-2.9.2/logs/hadoop-root-datanode-linux103.out
linux101: starting datanode, logging to /opt/lagou/servers/hadoop-2.9.2/logs/hadoop-root-datanode-linux101.out
Starting secondary namenodes [linux103]
linux103: starting secondarynamenode, logging to /opt/lagou/servers/hadoop-2.9.2/logs/hadoop-root-secondarynamenode-linux103.out
[root@linux101 hadoop-2.9.2]# jps
2689 DataNode
2900 Jps
2556 NameNode

[root@linux102 hadoop-2.9.2]# jps
1777 DataNode
1859 Jps

[root@linux103 servers]# jps
2019 Jps
1975 SecondaryNameNode
1868 DataNode

[root@linux103 hadoop-2.9.2]# sbin/start-yarn.sh
[root@linux103 hadoop-2.9.2]# jps
2646 ResourceManager
1975 SecondaryNameNode
1868 DataNode
2942 NodeManager
3054 Jps

[root@linux102 hadoop-2.9.2]# jps
1777 DataNode
2103 NodeManager
2239 Jps

[root@linux101 hadoop-2.9.2]# jps
2689 DataNode
2978 NodeManager
3090 Jps
2556 NameNode

停止YARN

stop-yarn.sh

原文链接:https://blog.csdn.net/weixin_41496763/article/details/117303192