Basic example of kickstarting data and monitoring backend for IoT projects

1. Terraform with DigitalOcean provider
   serving as orchestrator for infrastructure part via API

- config files:  
    
    digitalocean.tf : main configuration file with infrastructure specifications  
    outputs.tf : serves as template for output information about results  
    digitalocean.tfvars : contain api_key  
        Note: Missing from repo: `api_token = "xxx"`  
    terraform-droplet.yaml : cloud init script for postinstall tasks  
          
- workflow with terraform  
   
    terraform init (just once per project)  
    terraform apply -var-file="digitalocean.tfvars"  
    terraform destroy -var-file="digitalocean.tfvars"  

• link to digital ocean provider docs

2. Ansible swarm bootstrap
   serving as configuration management automation

- config files:  
    
    ansible.cfg : main configuration file with run defaults  
    ansible-droplet.inventory : inventory file with VM IPs and host variables  
    ansible-setup-swarm-cluster.yaml : simple playbook to kickstart Docker Swarm cluster  
    ansible-configure-swarm-stacks.yaml : playbook to deploy desired service containers  
    
- workflow with ansible  
    
    ansible-playbook ansible-setup-swarm-cluster.yaml  

• docker swarm starting guide

3. Ansible monitoring stack deploy
   - ansible-playbook ansible-configure-swarm-stacks.yaml
   - takes care of following service containers deploy

   prometheus : time series DB  
   alertmanager : router for prometheus alerts  
   pushgateway : push allowing gateway for pull prometheus ecosystem  
   node-exporter : gathering metrics about underlying linux system  
   balckbox-exporter : gathering information about provided http / https targets  
   grafana : multi-data-source vizualization tool  
   example-app : simple go app allowing to open http://<IP>:8080 and http://<IP>:8080/err  
   

4. import dashboard 7587
   - check other grafana functionality
   - graphs creation or import

5. insert dummy data with script and curl
   - basic bash script to input sensor like data create_data_samples.sh
   - echo "mymetric $(( $RANDOM % 35 + 10 ))" | curl --data-binary @- http://164.90.165.207:8084/metrics/job/my-temperature