I just install hadoop I'm trying to to test this exemple : https://tecadmin.net/hadoop-running-a-wordcount-mapreduce-example/ when I tape hdfs dfs -mkdir /user I have this error mkdir: `/user': Input/output error . I dont now why , also when I try to display directories and files under / by tapping hdfs dfs -ls / he list all directories and files under my local machine.

PS : when I just follow this tuturial for installation : https://tecadmin.net/setup-hadoop-single-node-cluster-on-centos-redhat/ and after installation I tried to go http://hadoop-master.domain.tld:8042/ there is nothing and I have The connection has timed out The server at hadoop-master is taking too long to respond.

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