Rigid set JAVA_HOME variable in Linux

Question

I'm trying to run all hadoop daemons with the command

./start-all.sh

from the main host cluster. As a result of execution several times gave out

starting namenode, logging to /export/hadoop-1.0.1/libexec/../logs/hadoop--namenode-one.out
192.168.1.10: starting datanode, logging to /export/hadoop-1.0.1/libexec/../logs/hadoop-hadoop-datanode-myhost2.out
192.168.1.10: Error: JAVA_HOME is not set.

And it happened several times even after execution on the virtual machine to the address of 192.168.1.10 commands

hadoop@myhost2:~$ export JAVA_HOME=/opt/jdk1.7.0_06

Tell please how rigidly once and for all to fix the JAVA_HOME variable.

Probably related to: http://stackoverflow.com/questions/2460633/linux-unix-environment-variables — ajp15243, Feb 15 '13 at 17:12

score 1 · Answer 1 · answered Feb 15 '13 at 17:11

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Put the line export JAVA_HOME=/path/to/java at the beginning of your start-all.sh script, and that should do it.

answered Feb 15 '13 at 17:11

Reinstate Monica -- notmaynard

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but this will only do the job only for this script not globally – kaysush Feb 15 '13 at 17:12
It should apply to all daemons launched from the script. – Reinstate Monica -- notmaynard Feb 15 '13 at 17:13
yes but for daemons launched from that script only not for other scripts. – kaysush Feb 15 '13 at 17:13
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True, but since the problem is only dealing with those daemons launched from this script, it seemed better to localize it. – Reinstate Monica -- notmaynard Feb 15 '13 at 17:15
hadoop-env.sh file comes in picture.. – Satish Feb 15 '13 at 17:21

score 1 · Answer 2 · answered Feb 15 '13 at 17:11

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$ vi ~/.bash_proflle

append this line to the file

export JAVA_HOME=/opt/jdk1.7.0_06

that will make permanent changes to JAVA_HOME environment variable.

answered Feb 15 '13 at 17:11

kaysush

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Satish · Answer 3 · 2013-02-15T17:20:45.400

You shoud set JAVA_HOME in hadoop-env.sh file also. Which is in $HADOOP_INSTALL/hadoop/conf directory of hadoop. by default JAVA_HOME setting line is commented

hadoop-env.sh - This file contains some environment variable settings used by Hadoop. You can use these to affect some aspects of Hadoop daemon behavior, such as where log files are stored, the maximum amount of heap used etc. The only variable you should need to change in this file is JAVA_HOME

Or You can add it in following file in hadoop account.

~/.bash_proflle

Rigid set JAVA_HOME variable in Linux

3 Answers3