=======================
Infrastructure Overview
=======================

The following chapters outline the infrastructural aspects of the Reference
Architecture for Kolab Groupware.

.. toctree::
    :maxdepth: 2

    network-topology-overview

*   Management Infrastructure

    *   System Provisioning

        *   If you can't do it all over again from scratch, how are you certain
            of anything?

    *   Internal Mirror

        *   Just to speed things up.

    *   Vendor Entitlement Satellite or Proxy Services

        *   Same reason as for the Internal Mirror, but with some Red Hat
            Enterprise Linux sauce. Includes pre-approval of updates pending
            on your system, local mirror, entitlement relay, reporting, and
            other such niceties.

*   DNS

    *   Hidden Master(s) Topology

    *   DNSSEC

    *   DANE

    *   Use of AnyCast DNS

    *   Hosted Specific:

        *   Domain Name Space Validation

        *   Domain Name Space Registration

    *   Split Horizon DNS

        *   For geographical origins

        *   For perimeter networks

        *   For internal networks

*   IP Space Allocation

    *   Public IP Space

    *   SNI support constraints

    *   Private IP Space

    *   IPv4: PAT vs. NAT

    *   IPv6: ??

    *   Predictability of Node IP address(es)

*   Clustered Services

*   Tenancy

*   Virtualization

    *   Technologies, Platforms

        *   QEMU-KVM, virt-manager: yes
        *   OpenStack: yes, via partner
        *   RHEV: yes, via partner
        *   OpenShift: yes, via partner
        *   VMWare ESX / vSphere: no, partner only, at best
        *   Microsoft Azure / Hyper-V: no, partner only, at best

    *   Software-Defined Networking

        *   Can also require physical layers

        *   Avoiding the use of GRE tunnels