[plug] How to set 'global' environment variables at boot time?

[Fred Janon]

Thanks for that Jason.
Does it mean that there is no way to set a global environment variable at boot time?
I wanted to understand not only for Tomcat but for future use as well.
Thanks
Fred

--- On Tue, 9/11/12, Jason Nicholls <jason at mindsocket.com.au> wrote:

From: Jason Nicholls <jason at mindsocket.com.au>
Subject: Re: [plug] How to set 'global' environment variables at boot time?
To: plug at plug.org.au
Date: Tuesday, September 11, 2012, 7:04 PM

Hey Fred,
I had a similar requirement to make a generic init script for a tomcat application which could be installed anywhere on the filesystem and even multiple copies.
In the end I created an init script that lived within the installed location and symlinked to it from /etc/init.d/<service_name>

Within the init script I get my install directory by running (in this case the init script lives in <tomcat_dir>/server/bin/helpers):

INSTALL_DIR=`dirname $(readlink -f $0) | sed 's/\/server\/bin\/helpers//'`
The next thing I do in the init script is read in the environment for this instance of tomcat, e.g.

if [ -f $INSTALL_DIR/server/bin/setenv.sh ]; then
    . $INSTALL_DIR/server/bin/setenv.sh
fi

The setenv.sh can contain anything required for this specific instance, e.g. java home, catalina home, java mem params etc...
Initially I had it configured to use something in /etc/defaults but I had to abstract things out to work with multiple installs on the same host plus support multiple flavours of Linux and other commercial UNIXes. The init scripts differ a bit but all come back to that setenv...


On Wed, Sep 12, 2012 at 12:42 AM, Fred Janon <fjanon at yahoo.com> wrote:

Hi,
I am working on a script to start Tomcat on a CentOS like OS (AWS EC2 Linux).

I need to configure a 'global' environment variable in the system that is set when the system boots and before the tomcat scripts executes to start the service. I did some research on z InnerNet and tried quite a few things with no success.

Basically I need to set and export the environment variable with a path ($CATALINA_HOME), maybe from /etc/profile?, and then read it from another script at boot time. Also how do I read and display the variable from the script to verify it is set properly?

All the scripts I've seen hard code the path, which I want to avoid.
Any
 suggestion?
Thanks
Fred

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-- 
Jason Nicholls
jason at mindsocket.com.au

0430 314 857




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