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Create a base CentOS 7 image for installation of all HySDS component instances

1. Start up a CentOS 7 instance. Use image from http://cloud.centos.org/centos/7/images/ for private cloud provisioning. For public cloud provisioning use CentOS 7 x86_64 HVM image at https://wiki.centos.org/Cloud/AWS.
2. Log into instance as user centos and sudo to root:

   sudo su -
   

3. Disable SELinux by modifying /etc/selinux/config:

   # This file controls the state of SELinux on the system.
   # SELINUX= can take one of these three values:
   #     enforcing - SELinux security policy is enforced.
   #     permissive - SELinux prints warnings instead of enforcing.
   #     disabled - No SELinux policy is loaded.
   SELINUX=disabled
   # SELINUXTYPE= can take one of three two values:
   #     targeted - Targeted processes are protected,
   #     minimum - Modification of targeted policy. Only selected processes are protected.
   #     mls - Multi Level Security protection.
   SELINUXTYPE=targeted
   

4. Install EPEL repo, update and upgrade:

   yum install -y epel-release
   yum update
   

5. Install requisite yum packages:

   yum -y install puppet puppet-firewalld nscd chrony wget curl subversion git vim screen
   

6. Clean yum cache:

   yum clean all
   

7. Clean cloud-init data:

   rm -rf /var/lib/cloud/*
   

8. Create an image of this instance using the method that pertains to your private/public cloud implementation. This image will now be used for generating all other HySDS component instances.