Node Profiles

Description

The Nodes section is used to define Fog resources. A fog infrastructure is composed of machines with various resource capabilities from low processing power machines, like Raspberries, to public cloud VMs, like Amazon’s EC2. To capture this heterogeneity Nodes section allows users to describe the resource characteristics of a physical or virtual host, including properties for the Processor, Memory, and Storage.
Users can determine multiple different Node profiles, which can be used in multiple Fog instances at the instantiation phase.

Following, we demonstrate how a raspberry pi 3b can be described:

nodes:
- name: raspberry_pi_3_B
  capabilities:
    processor:
      cores: 4
      clock_speed: 1400
    memory: 1G
    disk: 
        type: SDcard
        size: 8G
        read: 95MB/s
        write: 90MB/s

Parameters

Name

Name is the identifier of the node profile. Users use name to specify which fog node has the specific node capabilities.

Capabilities

Processor

Processor characterizes the CPU capabilities of the current node profile. Specifically, users defines the cores that is the number of CPU’s cores and the clock_speed that is the CPU frequency. By default, the units of clock_speed is the megahertz and the user should not define them. After the deployment, Fogify translates the latter into the cgroup constraints, dedicated for each running container.

Memory

Similarly with processor tag, memory specifies the amount of RAM that a Fog node is equipped with. The available units of memory property is G for gigabyte and M for megabyte.

Disk

Disk defines the node’s characteristics related to storage properties. With disk users can set the type of storage device (possible values are: SDcard, SSD, HDD), its size of storage in gigabyte (G) or megabyte (M), read and write speed in MB/S.