2. System Setup

2.1. Prerequisite

Here are the prerequisite commands for starting FogFlow:

  1. docker
  2. docker-compose

For ubuntu-16.04, you need to install docker-ce and docker-compose.

To install Docker CE, please refer to Install Docker CE, required version > 18.03.1-ce;

Important

please also allow your user to execute the Docker Command without Sudo

To install Docker Compose, please refer to Install Docker Compose, required version 18.03.1-ce, required version > 2.4.2

2.2. Start FogFlow Cloud node

2.2.1. Fetch all required scripts

Download the docker-compose file and the configuration files as below.

# the docker-compose file to start all FogFlow components on the cloud node
wget https://raw.githubusercontent.com/smartfog/fogflow/master/release/3.2.6/cloud/docker-compose.yml

# the configuration file used by all FogFlow components
wget https://raw.githubusercontent.com/smartfog/fogflow/master/release/3.2.6/cloud/config.json

# the configuration file used by the nginx proxy
wget https://raw.githubusercontent.com/smartfog/fogflow/master/release/3.2.6/cloud/nginx.conf

2.2.2. Change the IP configuration accordingly

You need to change the following IP addresses in config.json according to your own environment.

  • my_hostip: the IP of the FogFlow cloud node and this IP address should be accessible to the FogFlow edge node. Please DO NOT use “127.0.0.1” for this.
  • site_id: each FogFlow node (either cloud node or edge node) requires to have a unique string-based ID to identify itself in the system;
  • physical_location: the geo-location of the FogFlow node;
  • worker.capacity: it means the maximal number of docker containers that the FogFlow node can invoke;

Important

please DO NOT use “127.0.0.1” as the IP address of my_hostip , because they will be used by a running task inside a docker container.

Firewall rules: to make your FogFlow web portal accessible via the external_ip; the following ports must be open as well: 80 and 5672 for TCP

2.2.3. Start all components on the FogFlow Cloud Node

Pull the docker images of all FogFlow components and start the FogFlow system

# if you already download the docker images of FogFlow components, this command can fetch the updated images
    docker-compose pull

    docker-compose up -d

2.2.4. Validate your setup

There are two ways to check if the FogFlow cloud node is started correctly:

  • Check all the containers are Up and Running using “docker ps -a”
docker ps -a

CONTAINER ID      IMAGE                       COMMAND                  CREATED             STATUS              PORTS                                                                                          NAMES
90868b310608      nginx:latest            "nginx -g 'daemon of…"   5 seconds ago       Up 3 seconds        0.0.0.0:80->80/tcp                                                                               fogflow_nginx_1
d4fd1aee2655      fogflow/worker          "/worker"                6 seconds ago       Up 2 seconds                                                                                                         fogflow_cloud_worker_1
428e69bf5998      fogflow/master          "/master"                6 seconds ago       Up 4 seconds        0.0.0.0:1060->1060/tcp                                                                           fogflow_master_1
9da1124a43b4      fogflow/designer        "node main.js"           7 seconds ago       Up 5 seconds        0.0.0.0:1030->1030/tcp, 0.0.0.0:8080->8080/tcp                                                   fogflow_designer_1
bb8e25e5a75d      fogflow/broker          "/broker"                9 seconds ago       Up 7 seconds        0.0.0.0:8070->8070/tcp                                                                           fogflow_cloud_broker_1
7f3ce330c204      rabbitmq:3              "docker-entrypoint.s…"   10 seconds ago      Up 6 seconds        4369/tcp, 5671/tcp, 25672/tcp, 0.0.0.0:5672->5672/tcp                                            fogflow_rabbitmq_1
9e95c55a1eb7      fogflow/discovery       "/discovery"             10 seconds ago      Up 8 seconds        0.0.0.0:8090->8090/tcp                                                                           fogflow_discovery_1
51eff4975621      dgraph/standalone       "/run.sh"                15 seconds ago      Up 9 seconds        0.0.0.0:6080->6080/tcp, 0.0.0.0:8000->8000/tcp, 0.0.0.0:8082->8080/tcp, 0.0.0.0:9082->9080/tcp   fogflow_dgraph_1

Important

if you see any container is missing, you can run “docker ps -a” to check if any FogFlow component is terminated with some problem. If there is, you can further check its output log by running “docker logs [container ID]”

2.2.5. Try out existing IoT services

Once the FogFlow cloud node is set up, you can try out some existing IoT services without running any FogFlow edge node. For example, you can try out a simple fog function as below.

  • Click “Operator Registry” in the top navigator bar to triger the initialization of pre-defined operators.

After you first click “Operator Registry”, a list of pre-defined operators will be registered in the FogFlow system. With a second click, you can see the refreshed list as shown in the following figure.

_images/operator-list.png
  • Click “Service Topology” in the top navigator bar to triger the initialization of pre-defined service topologies.

After you first click “Service Topology”, a list of pre-defined topologies will be registered in the FogFlow system. With a second click, you can see the refreshed list as shown in the following figure.

_images/topology-list.png
  • Click “Fog Function” in the top navigator bar to triger the initialization of pre-defined fog functions.

After you first click “Fog Function”, a list of pre-defined functions will be registered in the FogFlow system. With a second click, you can see the refreshed list as shown in the following figure.

_images/function-list.png
  • Create an IoT device entity to trigger the Fog Function

You can register a device entity via the device registration page: 1) click “System Status”; 2) click “Device”; 3) click “Add”;

Then you will see the following device registration page.

_images/device-registration.png
  • Check if the fog function is triggered

Check if a task is created under “Task” in System Management.**

_images/fog-function-task-running.png

Check if a Stream is created under “Stream” in System Management.**

_images/fog-function-streams.png

2.3. Start FogFlow edge node

Typically, an FogFlow edge node needs to deploy a Worker, an IoT broker and a system monitoring agent metricbeat. The Edge IoT Broker at the edge node can establish the data flows between all task instances launched on the same edge node. However, this Edge IoT Broker is optional, especially when the edge node is a very constrained device that can only support a few tasks without any data dependency.

Here are the steps to start an FogFlow edge node:

2.3.1. Install Docker Engine

To install Docker CE and Docker Compose, please refer to Install Docker CE and Docker Compose on Respberry Pi.

Note

Docker engine must be installed on each edge node, because all task instances in FogFlow will be launched within a docker container.

2.3.2. Download the deployment script

#download the deployment scripts
wget https://raw.githubusercontent.com/smartfog/fogflow/master/docker/edge/http/edge_start.sh
wget https://raw.githubusercontent.com/smartfog/fogflow/master/docker/edge/http/edge_stop.sh

#make them executable
chmod +x edge_start.sh  edge_stop.sh

2.3.3. Download the default configuration file

#download the configuration file
wget https://raw.githubusercontent.com/smartfog/fogflow/master/docker/edge/http/config.json

2.3.4. Change the configuration file accordingly

You can use the default setting for a simple test, but you need to change the following addresses according to your own environment:

  • coreservice_ip: please refer to the configuration of the cloud part. This is the accessible address of your FogFlow core services running in the cloud node;
  • external_hostip: this is the external IP address, accessible for the cloud broker. It is useful when your edge node is behind NAT;
  • my_hostip is the IP of your default docker bridge, which is the “docker0” network interface on your host.
  • site_id is the user-defined ID for the edge Node. Broker and Worker IDs on that node will be formed according to this Site ID.
  • container_autoremove is used to configure that the container associated with a task will be removed once its processing is complete.
  • start_actual_task configures the Fogflow worker to include all those activities that are required to start or terminate a task or maintain a running task along with task configurations instead of performing the minimal effort. It is recommended to keep it true.
  • capacity is the maximum number of docker containers that the FogFlow node can invoke. The user can set the limit by considering resource availability on a node.
//you can see the following part in the default configuration file
{
    "coreservice_ip": "155.54.239.141",
    "external_hostip": "35.234.116.177",
    "my_hostip": "172.17.0.1",


    "site_id": "002",


    "worker": {
    "container_autoremove": false,
    "start_actual_task": true,
    "capacity": 4
    }


}

2.3.5. Start Edge node components

Note

if the edge node is ARM-basd, please attach arm as the command parameter

#start both components in the same script
./edge_start.sh

#if the edge node is ARM-basd, please attach arm as the command parameter
#./edge_start.sh  arm

2.3.6. Stop Edge node components

#stop both components in the same script
./edge_stop.sh