# Preparing the Installation

TrilioVault for RHV integrates tightly into the RHV environment itself.\
This integration requires preparation before the installation starts.

## Installing Redis

TrilioVault is capable of parallel disk transfer from multiple RHV-Hosts at the same time.

This capability is requiring a task queue system, [Python Celery](http://www.celeryproject.org/).

Python Celery requires a message broker system like RabbitMQ or Redis.\
TrilioVault uses the Redis message broker.

RHV does not include Redis, so installation is necessary.

{% hint style="info" %}
Redis is not available from a Red Hat repository yet. The Fedora EPEL repository provides the needed packages.
{% endhint %}

The following steps install Redis:

1. Add the Fedora EPEL Repository`# yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm` 
2. Install Redis \
   `# yum install redis`
3. Start Redis \
   `# systemctl start redis.service`
4. Enable Redis to start on boot\
    `# systemctl enable redis`
5. Check Redis status\
    `# systemctl status redis.service`

## Creation of the base VMs

The TrilioVault for RHV software Controller Cluster is getting installed on top of the 3 VMs, that need to be provided. These VMs need to fulfill the following requirements.

| Ressource        | Value  |
| ---------------- | ------ |
| vCPU             | 6      |
| RAM              | 16 GB  |
| Disk             | 100 GB |
| Operating System | RHEL 8 |

These VMs can be created by any means.

## Required OS configuration

The RHEL8 provided requires the following configuration.

* Python3 installed
* firewalld disabled
* selinux disabled

Keeping the firewalld and selinux services enabled can lead to unstable Kubernetes cluster communication, which will then lead to failed TrilioVault services.