How to integrate RackHD with multiple infrasim nodes in one OS

Introduction

To support multiple vnodes running under one OS without modifying too much configuration, we develop a tool, i.e. IVN, to setup a network environment integrating virtual vswitch and network namespace.

IVN Repository

Setup Environment

In the following sections, take RackHD ova environment as an example, which isc-dhcp-server is bound to eth1. You might have to modify some configuration if your environment has a different dhcp lease nic.

Setup Network Environment with IVN

Clone IVN repository and checkout branch for rackhd:

  git clone https://github.com/xiaowenjiang/ivn.git

  cd ivn

  git checkout rackhd

Install dependencies for IVN (under source code folder):

  sudo apt-get install –y bridge-utils openvswitch-switch

  sudo pip install –r requirments.txt

Remove the ip you assigned to dhcp binding nic (that 172.31.128.1 one). Here it's eth1:
```
  sudo ifconfig eth1 0
```
Modify the network configuration (/etc/network/interfaces) to append the following line:
```
  source /etc/network/interfaces.d/*
```
Run creator to setup network environment:
```
  sudo ./creator_rackhd.py create
```
You can check the newly created network namespaces with command:
```
  sudo ip netns list
```

You can see node1, node2, node3 listed if you succeed to setup the environment.

Install and configure infrasim-compute

Install infrasim-compute:
```
  sudo pip install infrasim-compute
```
Init infrasim service:
```
  sudo infrasim init
```

Add node configuration files into mapping list with the following configuration:

  ---
  #This file is used as InfraSIM configuration file
  name: node1
  namespace: node1
  type: quanta_d51

  compute:
      boot:
          splash: /usr/local/infrasim/data/boot_logo.jpg
      cpu:
          quantities: 2
          type: Haswell
      memory:
          size: 1024
      storage_backend:
          -
              type: ahci
              max_drive_per_controller: 6 
              drives:          
              -
                  size: 8
      networks:
  
          -
              network_mode: bridge
              network_name: br0
              device: e1000

Command to add node configurations (say it node1.yml):

    sudo infrasim config add node1 node1.yml
    sudo infrasim config add node2 node1.yml
    sudo infrasim config add node3 node1.yml

Edit node configurations of node2 and node3 to modify namespace, set them to "node2", "node3" separately:
```
  sudo infrasim config edit node2
  sudo infrasim config edit node3
```

Start infrasim vnodes one by one:

    sudo infrasim node start node1
    sudo infrasim node start node2
    sudo infrasim node start node3

After a while, you could check rackhd discovered list to see if the nodes are discovered.

Note that Your base vm should have enough memory for the nodes!!! Other resources also should be considered.

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