Re: RPM that modifies /etc/sysctl.conf

[Joe Van Dyk <joevandyk gmail com>]

On 2/1/06, Rob Riggs <rob pangalactic org> wrote:
> Joe Van Dyk wrote:
>
> >Say I want to add the following lines to /etc/sysctl.conf and do it via a RPM:
> >
> >kernel.shmmax = 200000000
> >kernel.shmall = 20000000
> >
> >Would my RPM just contain a patch?  Or would I not want to do this
> >kind of thing through an RPM?
> >
> >Our software requires a bunch of changes to a linux box in order to
> >run (modified kernel, the above change, a new compiler, etc).  RPMs
> >are a sane way of pushing out the changes to the machines, right?
> >
> >
> Create a file called /etc/opt/joe_van_dyk/sysctl.conf (silly example;
> use whatever is appropriate) and have an init script (e.g.
> /etc/init.d/joe_van_dyk) which runs "sysctl -p
> /etc/opt/joe_van_dyk/sysctl.conf" on startup.
>
> I typically put all of my config files in /etc/opt/{company}or
> /etc/opt/{package} for the software I build at work.
>
> In the RPM, you just need a post-install script to add the service, and
> a pre-uninstall script to remove it (using /sbin/chkconfig).  You may
> wish to even apply the settings immediately after package installation
> by adding a call to "/sbin/service joe_van_dyk start" in the
> post-install script.  Otherwise you will need to start the service
> manually.  (This may not be necessary for you, since you have to boot
> the modified kernel anyway.)
>
> With this mechanism, everything installs and uninstalls cleanly.

Hm.. thanks for the idea.

sysctl accepts a -w option that can change stuff right from the
command-line, without having to load in an entire config file.

Are there any guides or tutorials out there for how to correctly add
init scripts and services to a redhat box?