Operation and maintenance project training - Hadoop distributed file system HDFS

1, Hadoop distributed file system HDFS single data storage node

Specific steps: https://blog.csdn.net/Hannah_zh/article/details/81169416

[root@server1 ~]# su - hadoop [hadoop@server1 ~]$ cd hadoop/etc/hadoop/ [hadoop@server1 hadoop]$ vim core-site.xml <configuration> <property> <name>fs.defaultFS</name> <value>hdfs://172.25.51.1:9000</value> </property> </configuration>

[hadoop@server1 hadoop]$ vim slaves 172.25.51.1 [hadoop@server1 hadoop]$ vim hdfs-site.xml <configuration> <property> <name>dfs.replication</name> <value>1</value> ##The number of copies of data saved by hdfs is 1 </property> </configuration>

[hadoop@server1 ~]$ ssh-keygen [hadoop@server1 ~]$ cd .ssh/ [hadoop@server1 .ssh]$ ls id_rsa id_rsa.pub [hadoop@server1 .ssh]$ cp id_rsa.pub authorized_keys

Figure: verify password free login

[hadoop@server1 ~]$ cd hadoop [hadoop@server1 hadoop]$ pwd /home/hadoop/hadoop [hadoop@server1 hadoop]$ bin/hdfs namenode -format [hadoop@server1 hadoop]$ ls /tmp/ hadoop-hadoop hsperfdata_hadoop

Illustration: files generated after formatting

[hadoop@server1 hadoop]$ sbin/start-dfs.sh

Note: after configuring environment variables, you need to log in again to take effect

[hadoop@server1 ~]$ vim .bash_profile 10 PATH=$PATH:$HOME/bin:~/java/bin [hadoop@server1 ~]$ logout

[root@server1 ~]# su - hadoop [hadoop@server1 ~]$ jps 2082 DataNode ##Data node 2239 SecondaryNameNode ##From metadata node 1989 NameNode ##Metadata node 2941 Jps

[hadoop@server1 hadoop]$ bin/hdfs dfs -mkdir /user [hadoop@server1 hadoop]$ bin/hdfs dfs -mkdir /user/hadoop [hadoop@server1 hadoop]$ bin/hdfs dfs -put input/ ##Upload to input [hadoop@server1 hadoop]$ bin/hdfs dfs -ls

[hadoop@server1 hadoop]$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.3.jar wordcount input output

Figure: the following results show that the operation is successful

2, Hadoop distributed file system HDFS multi data storage node

server1: 172.25.51.1

server2: 172.25.51.2
server3: 172.25.51.3

[hadoop@server1 ~]$ cd hadoop [hadoop@server1 hadoop]$ rm -fr input/ output/ [hadoop@server1 hadoop]$ bin/hdfs dfs -get output [hadoop@server1 hadoop]$ rm -fr output/ [hadoop@server1 hadoop]$ sbin/stop-dfs.sh

[root@server1 ~]# yum install -y nfs-utils [root@server1 ~]# /etc/init.d/rpcbind start ##Before opening the nfs service. This service must be turned on [root@server1 ~]# vim /etc/exports /home/hadoop *(rw,anonuid=800,anongid=800) [root@server1 ~]# /etc/init.d/nfs start [root@server1 ~]# exportfs -v [root@server1 ~]# exportfs -rv

[root@server2 ~]# useradd -u 800 hadoop [root@server2 ~]# id hadoop uid=800(hadoop) gid=800(hadoop) groups=800(hadoop) [root@server2 ~]# yum install -y nfs-utils [root@server2 ~]# /etc/init.d/rpcbind start [root@server2 ~]# showmount -e 172.25.51.1 [root@server2 ~]# mount 172.25.51.1:/home/hadoop/ /home/hadoop/ [root@server2 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup-lv_root 19134332 925180 17237172 6% / tmpfs 510188 0 510188 0% /dev/shm /dev/vda1 495844 33451 436793 8% /boot 172.25.51.1:/home/hadoop/ 19134336 1962240 16200192 11% /home/hadoop

[root@server1 ~]# su - hadoop [hadoop@server1 ~]$ cd hadoop/etc/hadoop/ [hadoop@server1 hadoop]$ vim slaves ##Set Datanode 172.25.51.2 172.25.51.3 [hadoop@server1 hadoop]$ vim hdfs-site.xml 19 <configuration> 20 <property> 21 <name>dfs.replication</name> 22 <value>2</value> ##Duplicate two documents 23 </property> 24 </configuration> [hadoop@server1 hadoop]$ cd /tmp/ [hadoop@server1 tmp]$ rm -fr *

[hadoop@server1 tmp]$ ssh server2 [hadoop@server2 ~]$ logout [hadoop@server1 tmp]$ ssh server3 [hadoop@server3 ~]$ logout [hadoop@server1 tmp]$ ssh 172.25.120.2 [hadoop@server2 ~]$ logout [hadoop@server1 tmp]$ ssh 172.25.120.3 [hadoop@server2 ~]$ logout

[hadoop@server1 ~]$ cd hadoop [hadoop@server1 hadoop]$ bin/hdfs namenode -format [hadoop@server1 hadoop]$ ls /tmp/ hadoop-hadoop hsperfdata_hadoop

[hadoop@server1 hadoop]$ sbin/start-dfs.sh

Figure: jps viewing java process

31 January 2020, 18:22 | Views: 6367