pseudo-distributed.txt

-- Pseudo-Distributed

etc/hadoop/core-site.xml

<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://localhost:9000</value>
    </property>
</configuration>

etc/hadoop/hdfs-site.xml

<configuration>
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
</configuration>

ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
chmod 0600 ~/.ssh/authorized_keys

bin/hdfs namenode -format

- Start / Stop Hadoop
sbin/start-dfs.sh
sbin/stop-dfs.sh

- copy files in hdfs
/opt/hadoop/bin/hadoop fs -put /root/wordcount/input/file01 /root/wordcount/input
/opt/hadoop/bin/hadoop fs -put /root/wordcount/input/file02 /root/wordcount/input


http://192.168.56.20:50070/dfshealth.html#tab-overview

- Run map reduce job
/opt/hadoop/bin/hadoop fs -rm -r /user/root/output
/opt/hadoop/bin/hadoop jar /opt/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.3.jar grep input output 'dfs[a-z.]+'

- look result
bin/hdfs dfs -cat output/*