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PREINSTALL.md

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Pre-Installation Preparation

Assumptions

Omnia assumes that prior to installation:

  • Systems have a base operating system (currently CentOS 7 or 8)
  • Network(s) has been cabled and nodes can reach the internet
  • SSH Keys for root have been installed on all nodes to allow for password-less SSH
  • Ansible is installed on the master node yum install ansible

Example system designs

Omnia can configure systems which use Ethernet- or Infiniband-based fabric to connect the compute servers.

Example system configuration with Ethernet fabric

Example system configuration with Infiniband fabric

Network Setup

Omnia assumes that servers are already connected to the network and have access to the internet. Possible network configurations include:

  • A flat topology where all nodes are connected to a switch which includes an uplink to the internet. This requires multiple externally-facing IP addresses
  • A hierarchical topology where compute nodes are connected to a common switch, but the master node contains a second network connection which is connected to the internet. All outbound/inbound traffic would be routed through the master node. This requires setting up firewall rules for IP masquerade, see (https://www.server-world.info/en/note?os=CentOS_7&p=firewalld&f=2) for an example.