Oct 21

Introduction

Please see the article “Build a Linux-based Infrastructure Solution Demonstration Series” (http://blogs.czapski.id.au/2016/10/build-a-linux-based-infrastructure-solution-demonstration-series) for rationale, introduction and links to articles in this series.

In this article I am creating and executing a script which will disable unneeded services.

Pre-Requisites

This article assumes that

  1. The work is done in the Virtual Box Machine Image created in accordance with the instructions in the blog article to be found at http://blogs.czapski.id.au/2016/10/configure-virtual-box-virtual-machine-and-install-centos-6-8-base-image.
  2. The user “demo” has sudo access without a password. If this is not the case use the command “su -” and provide the password instead of saying “sudo -i” in the set of commands below

The instructions should work in other RedHat 6-like OS’ and OS versions.

Disable unneeded Services

Create and execute a script which will disable some unneeded services.

Remember that all this can be done manually but my objective is to create configuration scripts which I can execute and have the demo image configured without having to tediously manipulate various UIs.

mkdir -p /media/sf_distros/scripts
cat <<-'EODECK' > /media/sf_distros/scripts/004_disable_unneeded_services.sh
# disable unneeded services
sudo chkconfig postfix off
sudo chkconfig pcscd off
sudo chkconfig openct off
sudo chkconfig bluetooth  off

sudo service postfix stop
sudo service pcscd stop
sudo service openct stop
sudo service bluetooth  stop

EODECK
chmod ug+x /media/sf_distros/scripts/004_disable_unneeded_services.sh

Execute the commands

/bin/bash -v /media/sf_distros/scripts/004_disable_unneeded_services.sh

Append “disable unneeded services” script execution commands to the initial bulk configuration script. This script is intended to collect all automated configuration commands and scripts so that they can be all executed in one go on a brand new image if one gets to do this the second and subsequent times.

Don’t actually execute this script while you are building the first image.

cat <<-'EODECK' >> /media/sf_distros/scripts/000_initial_bulk_configuration.sh
# disable unneeded services
/bin/bash -v /media/sf_distros/scripts/004_disable_unneeded_services.sh

EODECK
chmod ug+x /media/sf_distros/scripts/000_initial_bulk_configuration.sh
preload preload preload