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Posted to user@hadoop.apache.org by Stephen Boesch <ja...@gmail.com> on 2012/10/12 15:37:55 UTC
Getting hostname (or any environment variable) into *-site.xml files
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
Re: Getting hostname (or any environment variable) into *-site.xml files
Posted by Stephen Boesch <ja...@gmail.com>.
Thanks Harsh that is helpful and it does work.
2012/10/12 Harsh J <ha...@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 ${HOSTNAME} will be replaced by
> donkeykong.com automatically.
>
> Likewise, even using Tool as the entry point of your app will let you
> achieve the same via regular -D args.
>
> Hope this helps!
>
> On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <ja...@gmail.com> wrote:
> > Hi,
> > We are using a library with hdfs that uses custom properties inside
> the
> > *-site.xml files. Instead of (a) hard-coding or (b) writing a "sed"
> script
> > to update to the local hostnames on each deployed node, is there a
> mechanism
> > to use environment variables?
> >
> > <property>
> > <name>custom.property</name>
> > <value>${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
>
Re: Getting hostname (or any environment variable) into *-site.xml files
Posted by Stephen Boesch <ja...@gmail.com>.
Thanks Harsh that is helpful and it does work.
2012/10/12 Harsh J <ha...@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 ${HOSTNAME} will be replaced by
> donkeykong.com automatically.
>
> Likewise, even using Tool as the entry point of your app will let you
> achieve the same via regular -D args.
>
> Hope this helps!
>
> On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <ja...@gmail.com> wrote:
> > Hi,
> > We are using a library with hdfs that uses custom properties inside
> the
> > *-site.xml files. Instead of (a) hard-coding or (b) writing a "sed"
> script
> > to update to the local hostnames on each deployed node, is there a
> mechanism
> > to use environment variables?
> >
> > <property>
> > <name>custom.property</name>
> > <value>${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
>
Re: Getting hostname (or any environment variable) into *-site.xml files
Posted by Stephen Boesch <ja...@gmail.com>.
Thanks Harsh that is helpful and it does work.
2012/10/12 Harsh J <ha...@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 ${HOSTNAME} will be replaced by
> donkeykong.com automatically.
>
> Likewise, even using Tool as the entry point of your app will let you
> achieve the same via regular -D args.
>
> Hope this helps!
>
> On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <ja...@gmail.com> wrote:
> > Hi,
> > We are using a library with hdfs that uses custom properties inside
> the
> > *-site.xml files. Instead of (a) hard-coding or (b) writing a "sed"
> script
> > to update to the local hostnames on each deployed node, is there a
> mechanism
> > to use environment variables?
> >
> > <property>
> > <name>custom.property</name>
> > <value>${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
>
Re: Getting hostname (or any environment variable) into *-site.xml files
Posted by Stephen Boesch <ja...@gmail.com>.
Thanks Harsh that is helpful and it does work.
2012/10/12 Harsh J <ha...@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 ${HOSTNAME} will be replaced by
> donkeykong.com automatically.
>
> Likewise, even using Tool as the entry point of your app will let you
> achieve the same via regular -D args.
>
> Hope this helps!
>
> On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <ja...@gmail.com> wrote:
> > Hi,
> > We are using a library with hdfs that uses custom properties inside
> the
> > *-site.xml files. Instead of (a) hard-coding or (b) writing a "sed"
> script
> > to update to the local hostnames on each deployed node, is there a
> mechanism
> > to use environment variables?
> >
> > <property>
> > <name>custom.property</name>
> > <value>${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
>
Re: Getting hostname (or any environment variable) into *-site.xml files
Posted by Harsh J <ha...@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 ${HOSTNAME} will be replaced by
donkeykong.com automatically.
Likewise, even using Tool as the entry point of your app will let you
achieve the same via regular -D args.
Hope this helps!
On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <ja...@gmail.com> wrote:
> Hi,
> We are using a library with hdfs that uses custom properties inside the
> *-site.xml files. Instead of (a) hard-coding or (b) writing a "sed" script
> to update to the local hostnames on each deployed node, is there a mechanism
> to use environment variables?
>
> <property>
> <name>custom.property</name>
> <value>${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
Re: Getting hostname (or any environment variable) into *-site.xml files
Posted by Harsh J <ha...@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 ${HOSTNAME} will be replaced by
donkeykong.com automatically.
Likewise, even using Tool as the entry point of your app will let you
achieve the same via regular -D args.
Hope this helps!
On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <ja...@gmail.com> wrote:
> Hi,
> We are using a library with hdfs that uses custom properties inside the
> *-site.xml files. Instead of (a) hard-coding or (b) writing a "sed" script
> to update to the local hostnames on each deployed node, is there a mechanism
> to use environment variables?
>
> <property>
> <name>custom.property</name>
> <value>${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
Re: Getting hostname (or any environment variable) into *-site.xml files
Posted by Harsh J <ha...@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 ${HOSTNAME} will be replaced by
donkeykong.com automatically.
Likewise, even using Tool as the entry point of your app will let you
achieve the same via regular -D args.
Hope this helps!
On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <ja...@gmail.com> wrote:
> Hi,
> We are using a library with hdfs that uses custom properties inside the
> *-site.xml files. Instead of (a) hard-coding or (b) writing a "sed" script
> to update to the local hostnames on each deployed node, is there a mechanism
> to use environment variables?
>
> <property>
> <name>custom.property</name>
> <value>${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
Re: Getting hostname (or any environment variable) into *-site.xml files
Posted by Harsh J <ha...@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 ${HOSTNAME} will be replaced by
donkeykong.com automatically.
Likewise, even using Tool as the entry point of your app will let you
achieve the same via regular -D args.
Hope this helps!
On Fri, Oct 12, 2012 at 7:07 PM, Stephen Boesch <ja...@gmail.com> wrote:
> Hi,
> We are using a library with hdfs that uses custom properties inside the
> *-site.xml files. Instead of (a) hard-coding or (b) writing a "sed" script
> to update to the local hostnames on each deployed node, is there a mechanism
> to use environment variables?
>
> <property>
> <name>custom.property</name>
> <value>${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