Permission Denied error while running start-dfs.sh
Solution 1
I also encountered the same thing, I did so I found that my pdsh default rcmd is rsh, not ssh, rsh and ssh remote login authentication is not the same, when installing hadoop I configured ssh localhost password-free login, but rsh is not possible.
so,try:
1.check your pdsh default rcmd rsh
pdsh -q -w localhost
See what your pdsh default rcmd is.
2.Modify pdsh's default rcmd to ssh
export PDSH_RCMD_TYPE=ssh
you can be added to ~/.bashrc, and source ~/.bashrc
3.sbin / start-dfs.sh
Solution 2
Uninstall pdsh
will solve this problem. I am working with Hadoop version 3.2.1 on Ubuntu 18.04.4 LTS.
I test start-dfs.sh
on several fresh-installed virtual machines and one old VM. The command failed only on the old VM. I have tried the high-voted answer, and found that only the old VM has pdsh
installed. So I uninstall this software, and after that the command executed successfully.
So, if you did not install pdsh
for some purpose, you can try to uninstall it.
Solution 3
Try uninstalling pdsh
sudo apt-get remove pdsh
and then restart your hadoop by:
sudo start-dfs.sh
This is what worked for me.
Solution 4
A sudo user could also change pdsh's Rcmd type to ssh via the command:
echo "ssh" | sudo tee /etc/pdsh/rcmd_default
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Gaurav A Dubey
Student and currently doing masters in IT. Eager to learn, develop and contribute to open source. :)
Updated on July 09, 2022Comments
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Gaurav A Dubey almost 2 years
I am getting this error while performing
start-dfs.sh
Starting namenodes on [localhost] pdsh@Gaurav: localhost: rcmd: socket: Permission denied Starting datanodes pdsh@Gaurav: localhost: rcmd: socket: Permission denied Starting secondary namenodes [Gaurav] pdsh@Gaurav: Gaurav: rcmd: socket: Permission denied 2017-03-13 09:39:29,559 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Using hadoop 3.0 alpha 2 version.
Any help is appreciated
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BruceWayne about 7 yearsThis might help you pka.engr.ccny.cuny.edu/~jmao/node/57
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Gaurav A Dubey about 7 yearsHey BATMAN.... The above url didnt work....
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Gaurav A Dubey about 7 yearsHi! thanks for the help... The problem was occurring due to 3.0 alpha 2. When I repeated process in hadoop2.7 it solved the problem...
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Adi Krishnan over 3 yearsThis worked for me too.
pdsh
is not an absolute requirement. From the docs -Additionally, it is recommmended that pdsh also be installed for better ssh resource management.
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Erol Erdogan over 3 yearsYou're great. It definitely worked for me. The people probably set-up it over ssh. But this setting was rsh. This is correct solution.
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Lawhatre over 2 yearsafter removing pdsh i got
ERROR: JAVA_HOME is not set and could not be found.
I don't think it was to be removed. -
Gary Wang over 2 years@Lawhatre
JAVA_HOME
can be explicitly set inHADOOP_HOME/etc/hadoop/hadoop-env.sh
orHOME/.bashrc
or/etc/profile.d/hadoop.sh
. Make sure that JDK/JRE have been installed on your system.