Shulou(Shulou.com)06/03 Report--

Foreword:

In this article www.jianshu.com/p/eeae2f37a48c

We use root user to deploy, in production environment, generally a component is started by a user, this article describes how to use hadoop users to redeploy pseudo-distributed (HDFS)

1. preliminary preparation

Create hadoop user and configure ssh password free login

Reference: www.jianshu.com/p/589bb43e0282

2. Stop the HDFS process initiated by root and delete the storage file in/tmp directory [root@hadoop000 hadoop-2.8.1]# pwd/opt/software/hadoop-2.8.1[root@hadoop000 hadoop oop-2.8.1]# jps32244 NameNode32350 DataNode32558 SecondaryNameNode1791 Jps[root@hadoop000 hadoop-2.8.1] 1]# sbin/stop-dfs.sh Stopping namenodes on [hadoop000]hadoop000: stopping namenodelocalhost: stopping datanodeStopping secondary namenodes [0.0.0.0]0.0.0.0: stopping secondarynamenode[root@hadoop000 hadoop-2.8.1]# jps2288 Jps[root@hadoop000 hadoop-2.8.1]# rm -rf /tmp/hadoop-* /tmp/hsperfdata_*3. Change file ownership [root@hadoop000 software]# pwd/opt/software[root@hadoop000 software]# chown -R hadoop: hadoop hadoop-2.8.14. Go to hadoop User Modify Related Profiles #Step 1:[hadoop@hadoop000 hadoop]$ pwd/opt/software/hadoop-2.8.1/etc/hadoop[hadoop@hadoop000@adoop]$ vi hdfs-site.xml dfs.replication1dfs. namenode.secondary.http-address192.168.6.217:50090dfs.namenode.secondary. https-address 192. 168. 6. 217: 50091#Step 2:[hadoop@hadoop000 hadoop]$ vi core-site.xml fs.defaultFShdfs://192.168.6.217:9000#Step 3:[hadoop@hadoop000 hadoop]# vi slaves 192.168.6.2175. Format and Initiate [hadoop@hadoop000 hadoop-2.8.1]$ pwd/opt/software/hadoop-2.8.1[hadoop@hadoop000 hadoop-2.8.1]$ bin/hdfs namesode-format[hadoop@hadoop000 hadoop-2.8.1]$ sbin/start-dfs.shStarting namesodes on [hadoop000]hadoop000: starting namenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-namenode-hadoop000.out192.168.6.217: starting datanode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-datanode-hadoop000.outStarting secondary namenodes [hadoop000]hadoop000: starting secondarynamenode, logging to /opt/software/hadoop-2.8.1/logs/hadoop-hadoop-secondarynamenode-hadoop 000.out[hadoop@hadoop000 hadoop-2.8.1]$ jps3141 Jps2806 DataNode2665 NameNode2990 SecondaryNameNode#So far it is found that HDFS three processes are started with hadoop000,

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