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Date: Thu, 18 Oct 2012 07:05:27 -0700
Message-ID: 
 <CACkSZy3cTu1fHg-5LwfMHP9zU58TWvGr7O8cQmX=L1fapGoerg@mail.gmail.com>
Subject: Re: Getting hostname (or any environment variable) into *-site.xml
 files
From: Stephen Boesch <javadba@gmail.com>
To: user@hadoop.apache.org
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Thanks Harsh that is helpful and it does work.

2012/10/12 Harsh J <harsh@cloudera.com>

> The ${FOO} stuff can be replaced via JVM System Properties. I just
> explained this on another thread (a few mails ago).
>
> So if your "library" JVM had a system property of
> -DHOSTNAME=donkeykong.com then ${HOSTNAME} will be replaced by
> donkeykong.com automatically.
>
> Likewise, even using Tool as the entry point of your app will let you
> achieve the same via regular -D args.
>
> Hope this helps!
>
> On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <javadba@gmail.com> wrote:
> > Hi,
> >    We are using a library with hdfs that uses custom properties inside
> the
> > *-site.xml files.  Instead of (a) hard-coding or (b) writing a "sed"
> script
> > to update to the local hostnames on each deployed node, is there a
> mechanism
> > to use environment variables?
> >
> > <property>
> > <name>custom.property</name>
> > <value>${HOSTNAME}</value>
> > </property>
> >
> >
> > I have tried this and out of the box the string ${HOSTNAME} is used.
>  Anyone
> > have recommendation/solution on this?
> >
> > thanks,
> >
> > stephen b
>
>
>
> --
> Harsh J
>

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Thanks Harsh that is helpful and it does work.<br><br><div class=3D"gmail_q=
uote">2012/10/12 Harsh J <span dir=3D"ltr">&lt;<a href=3D"mailto:harsh@clou=
dera.com" target=3D"_blank">harsh@cloudera.com</a>&gt;</span><br><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex">

The ${FOO} stuff can be replaced via JVM System Properties. I just<br>
explained this on another thread (a few mails ago).<br>
<br>
So if your &quot;library&quot; JVM had a system property of<br>
-DHOSTNAME=3D<a href=3D"http://donkeykong.com" target=3D"_blank">donkeykong=
.com</a> then ${HOSTNAME} will be replaced by<br>
<a href=3D"http://donkeykong.com" target=3D"_blank">donkeykong.com</a> auto=
matically.<br>
<br>
Likewise, even using Tool as the entry point of your app will let you<br>
achieve the same via regular -D args.<br>
<br>
Hope this helps!<br>
<div><div><br>
On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch &lt;<a href=3D"mailto:javad=
ba@gmail.com" target=3D"_blank">javadba@gmail.com</a>&gt; wrote:<br>
&gt; Hi,<br>
&gt; =A0 =A0We are using a library with hdfs that uses custom properties in=
side the<br>
&gt; *-site.xml files. =A0Instead of (a) hard-coding or (b) writing a &quot=
;sed&quot; script<br>
&gt; to update to the local hostnames on each deployed node, is there a mec=
hanism<br>
&gt; to use environment variables?<br>
&gt;<br>
&gt; &lt;property&gt;<br>
&gt; &lt;name&gt;custom.property&lt;/name&gt;<br>
&gt; &lt;value&gt;${HOSTNAME}&lt;/value&gt;<br>
&gt; &lt;/property&gt;<br>
&gt;<br>
&gt;<br>
&gt; I have tried this and out of the box the string ${HOSTNAME} is used. =
=A0Anyone<br>
&gt; have recommendation/solution on this?<br>
&gt;<br>
&gt; thanks,<br>
&gt;<br>
&gt; stephen b<br>
<br>
<br>
<br>
</div></div><span><font color=3D"#888888">--<br>
Harsh J<br>
</font></span></blockquote></div><br>

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