Hi,
I am running a single node hadoop cluster and also the HDFS NFS gateway on the
same node. HDFS processes are running under the context of user “hadoop” and
NFS gateway is running under the context of user “nfsserver”. I mounted the NFS
export on the same machine as the root user. Now whenever I try to write to NFS
mount as the root user I get “permission denied” error. Also I constantly see
this error message on the terminal, where I mounted the NFS export -
INFO security.ShellBasedIdMapping: Can't map group supergroup. Use its string
hashcode:-1710818332
HDFS namenode/datanode NFS config -
core-site.xml -
<property>
<name>hadoop.proxyuser.nfsserver.groups</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.nfsserver.hosts</name>
<value>*</value>
</property>
hdfs-site.xml -
<property>
<name>nfs.dump.dir</name>
<value>/tmp/.hdfs-nfs</value>
</property>
<property>
<name>nfs.exports.allowed.hosts</name>
<value>* rw</value>
</property>
HDFS NFS gateway config -
core-site.xml -
<property>
<name>hadoop.proxyuser.nfsserver.groups</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.nfsserver.hosts</name>
<value>* rw</value>
</property>
hdfs-site.xml -
<property>
<name>nfs.dump.dir</name>
<value>/tmp/.hdfs-nfs</value>
</property>
<property>
<name>nfs.exports.allowed.hosts</name>
<value>* rw</value>
</property>
When I try to do IO on NFS mount as “hadoop” user I don’t face any permission
issue. Why am I getting permission denied error while trying to perform writes
as root user?
Thanks
Saurabh
