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From "Stu Hood" <>
Subject Re: overriding directories from command line
Date Fri, 20 Nov 2009 21:11:27 GMT
I would vote for this one as well, if somebody wants to create the issue.

-----Original Message-----
From: "Ted Zlatanov" <>
Sent: Friday, November 20, 2009 3:01pm
Subject: Re: overriding directories from command line

On Mon, 16 Nov 2009 09:39:15 -0800 Anthony Molinaro <> wrote:

AM>   If you are thinking about config file changes I'd like to request some
AM> sort of inclusion mechanism.   For instance, if you could had 2 keyspaces
AM> which you want to deploy on separate clusters in production but allow
AM> developers to install simultaneously on their development box, it would
AM> be great if you could do this by have 3 files. One of which has settings
AM> specific to the developer box (ie, memory settings), and one for each
AM> keyspace.  Then I could create 5 packages (RPM or deb)

AM>  1. one with the developer box settings which includes both keyspace configs
AM>  2. one with the production box settings for the cluster controlling keyspace1
AM>     which includes keyspace1 config.
AM>  3. one with the production box settings for the cluster controlling keyspace2
AM>     which includes keyspace2 config.
AM>  4. one with just the keyspace1 config.
AM>  5. one with just the keyspace2 config.

AM> I could do all this with a bunch of preprocessing at package build time,
AM> but that gets a little annoying.  And right now I just have the config
AM> copied and everytime I need to change a CF I need to change it in 3
AM> places (devel, qa, and prod configs).

AM> One great solution would be to support the loading of multiple configs
AM> from a directory.  You already see this a lot, for instance /etc/init.d
AM> or /etc/httpd/conf.d on most unix systems.

This is actually my situation too.  I have to roll out slightly
customized Cassandra instances to several colos and it's unpleasant to
use cfengine or Puppet to edit XML files, so I'd rather have some simple
inclusion and interpolation mechanism.


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