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Networking Configuration of MOC POC

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Ian Denhardt edited this page Aug 21, 2013 · 16 revisions

This page outlines the networking configuration of the MOC POC.

Overview

The network consists of the following:

  • A VM host called death-star, with 32 GiB of ram, 4 CPU cores, and 6 NICs.
    • Hosts several VMs with important roles in the network, all named moc-*.
  • One 16-port unmanaged switch
  • One 16-port managed switch
  • 12 inherited Dell Optiplex 760 workstations, with 4 GiB of RAM and 2 NICs each

The unmanaged switch provides a "public," (but behind a NAT) network. We treat this as if it were on the public internet; The NAT's purpose is to ensure that we don't cause problems for other users of our BU subnet if we e.g. misconfigure a dhcp server. Machines on this network are in the 192.168.3.0/24 range, and we refer to this as "nat-public".

The managed switch is used to isolate "tenants" in the network - each of which consists of a head node, and a subset of the dell workstations. It uses vlans for this purpose. port 16 on the managed switch is hooked in to death-star, and configured as trunking. (the relevant nic on death-star is vlan aware, and death-star is responsible for routing vlan traffic to the correct head node.)

A few machines are connected directly to BU, and have globally routable ip addresses. These are "public" ip addresses.

Individual machine configurations.

Owned static ips

  • Name: moc-compute.bu.edu, Address: 128.197.44.203
  • Name: moc-control.bu.edu, Address: 128.197.44.202

MOCPOC cluster IPs:

  • death-star (Death Star VM configuration)

    • nat-public : 192.168.3.254
    • public: 128.197.44.203

  • VMs on death-star:

    • moc-dhcp

      • nat-public 192.168.3.253
      • serves reserved ip addresses to each of the hardware nodes, along with a few virtual machines
      • serves the range 192.168.3.64-127 to other machines.

    • moc-dns

      • nat-public 192.168.3.248

    • moc-nfs

      • nat-public 192.168.3.252

    • moc-ntp

      • nat-public 192.168.3.249

    • moc-gateway

      • nat-public 192.168.3.250

  • All compute nodes:

    • eth0 is connected to the private network and the IP assigned from the moc-dhcp DHCP server.
    • moc-dhcp gives private address in range 192.168.3.1-31

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