Kubernetes with microK8s: First steps to expose a service to external

At home i wanted to have my own kubernetes cluster. I own 2 raspberry pi based on ubuntu, so i decided to install microK8s:

--> https://ubuntu.com/blog/what-can-you-do-with-microk8s

The installation is very well explained here:

https://ubuntu.com/tutorials/install-a-local-kubernetes-with-microk8s#1-overview

 

BUT: i found nowhere a tutorial how to run an container and expose the port in a way that i is reachable from other pc like localhost.

So here we go:

kubectl create deployment web --image=nginx
kubectl expose deployment web --type=NodePort --port=80

After that just do:

# kubectl get all
NAME                      READY   STATUS    RESTARTS   AGE
pod/web-96d5df5c8-5xvfc   1/1     Running   0          112s

NAME                 TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP   10.152.183.1    <none>        443/TCP        2d5h
service/web          NodePort    10.152.183.66   <none>        80:32665/TCP   105s

NAME                  READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/web   1/1     1            1           112s

NAME                            DESIRED   CURRENT   READY   AGE
replicaset.apps/web-96d5df5c8   1         1         1       112s

On you kubernetes node you can reach the service with 10.152.183.66:80.

For getting the nginx from another pc just use:

<yourkuberneteshost>:32665

For me:

 

ZigBee@Linux: Getting Data from ZigBee Devices via MQTT to InfluxDB and Grafana

Getting sensors with zigbee integrated with my linux raspberry pi, i did some monitoring tasks on my raspberry pi.

1. Monitoring my raspberry pi:
   There is a very nice tutorial:
   https://medium.com/@andreea.sonda31/monitor-raspberry-pi-resources-and-parameters-with-grafana-board-part-1-ab0567303e8
   Or even better: Just use this from grafana:
   https://grafana.com/grafana/dashboards/10578
1. add deb https://packages.grafana.com/oss/deb stable main to a file in /etc/apt/sources.list.d/
   
2. apt install grafana telegraf influxdb
   
3. configure telegraf for your influxdb
4. import the json from the grafana.com-link above
   
   
   
   
   
   
2. Monitoring my Fritz.Box with Grafana:
   https://grafana.com/grafana/dashboards/713 
   and follow the given tutorial https://fetzerch.github.io/2014/08/23/fritzcollectd/

After these steps i have the following infrastructures running:

1. zigbee2mqtt --> MQTT -->FHEM
   
   
   
   
   
2. Fritz.box --> collectd --> InfluxDB --> Grafana
   
   
3. raspberry --> telegraf --> InfluxDB --> Grafana
   
   
   
   
   

For  2 and 3 it is very easy to create graphics and the presentation looks little bit prettier than 1 (imho). 

AND there is only one frontend to configure. So what about the following chain for my zigbee sensors:

1. zigbee2mqtt --> MQTT -->telegraf --> InfluxDB --> Grafana 

Looks like some more steps, but the telegraf --> InfluxDB --> Grafana chain is already there for monitoring my raspberry pi.

So i only had to add the following on /etc/telegraf/telegraf.conf:

[[inputs.mqtt_consumer]]
   servers = ["tcp://127.0.0.1:1883"]
   topics = [
     "zigbee2mqtt/0x00158d000542239e",
     "zigbee2mqtt/0x00158d00044a6378",
     "zigbee2mqtt/0x00158d0003f0faad",
     "zigbee2mqtt/0x00158d00044a72a2",
   data_format = "json"

And after that i was able to use the data in Grafana:

 

ZigBee@Linux: Securing zigbee2mqtt & MQTT@FHEM & FHEM

After my setup is running, just some words about securing the whole setup.

The web gui of FHEM was already setup with SSL/HTTPS but the MQTT server is listening for all ips.

The easiest way to get this secure is change the listener to localhost, so that no connections from outside can be made. Just change in /opt/fhem/fhem.cfg:

define MQTT2_FHEM_Server MQTT2_SERVER 1883 127.0.0.1

Just a checklist, if we secured everything:

• FHEM
• WebGUI: shown here
• MQTT: s. above
• zigbee2mqtt
• add permit_join: false to configuration.yaml

ZigBee@Linux: Integration of zigbee2mqtt with FHEM (mqtt server) on ubuntu server

After the setup of FHEM and zigbee2mqtt the integration of both components has to be done.

What has to be done?

After reading the excellent documentation of FHEM it is very easy - FHEM can be configured, so that it is providing a mqtt server. 

First you have to add the following line in /opt/zigbee2mqtt/data/configuration.yaml inside the "mqtt:" section:

  client_id: 'zigbee_pi'

Then go to the command prompt of the FHEM webgui and enter the following:

define MQTT2_FHEM_Server MQTT2_SERVER 1883 global
defmod MQTT2_zigbee_pi MQTT2_DEVICE zigbee_pi
attr MQTT2_zigbee_pi IODev MQTT2_FHEM_Server
attr MQTT2_zigbee_pi bridgeRegexp zigbee2mqtt/([A-Za-z0-9]*)[/]?.*:.* "zigbee_$1"

After that you should see something like this:

(you can change the style of the page via "select style" on the left column)

Then you should save:

To create a graph just click on the file which is created for your zigbee device:

and then there should be something like:

Here you can click on "Create SVG plot" and on:

click on "write .gplot file" and your first graph is there... Repeat this and you can get: