Installation

Installation Modes

Fogify can be installed either directly on cluster nodes, aka as a bare-metal installation, or the user can utilize a containerized version of the system written in docker-compose file. However, for both modes, the all cluster nodes should have installed the Requirement Software Components, namely, the docker Swarm orchestrator and a network Linux kernel package (iproute).

Requirement Software Components

Orchestrator (Swarm Installation)

According to the Orchestration, Fogify needs a pre-installed Docker Swarm Orchestrator. With the following command, the user can easily install a Docker Swarm Manager (master Node).


docker swarm init --advertise-addr <hosts_ip>

The latter command will generate a result similar to:

Swarm initialized: current node (dxn1zf6l61qsb1josjja83ngz) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join \
    --token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
    192.168.99.100:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

At this time, the Docker Swarm cluster consists of one node which is Manager and Worker. If a user needs to add more nodes, he/she can run the following command on each extra node.



$ docker swarm join \
    --token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
    192.168.99.100:2377

Kernel Network Plugin

Fogify executes some low-level commands in order to apply specific characteristics to the network. For this reason, on each cluster node, we should install the traffic control tool (tc-tool). On Debian-based destributions, tc-tool comes bundled with iproute, so in order to isntall it you have to run:


apt-get install iproute

Required Parameters

The parameters of the Fogify should pass through host’s environmental parameter. Specifically, the parameters are the following:

MANAGER_NAME: the relative name of the swarm master node
MANAGER_IP: the manager’s IP
HOST_IP: the machine’s IP
CPU_OVERPROVISIONING_PERCENTAGE: a CPU overprovisioning percentage, the default is 0
RAM_OVERPROVISIONING_PERCENTAGE: a CPU overprovisioning percentage, the default is 0
CPU_FREQ: The CPU frequency of the host machine

A user selects a percentage of CPU or RAM overprovisioning, and Fogify will generate two limits: an upper limit and a lower limit for each emulated device. For instance, a 20% overprovissioning configuration demands the emulated nodes to occupy the 20% less than the maximum processing power that the user selected. However, when any node requires extra power, the system will provide it, if there are available resources. Generally, the system will provide overprovisioning as a share competing portion of CPU or RAM.

Running Fogify through docker-compose.yaml the latter parameters may be declared in .env file or via command line parameters of docker-compose up command.

Fogify: A Fog Computing Emulation Framework Fogify in Docker-compose