I had some trouble deploying a telegraf instance to get my metrics from TrueNAS to my InfluxDB. This repository contains some examples to get this thing running with the first informations provided in this Subreddit: https://www.reddit.com/r/homelab/comments/13rxlux/telegraf_on_truenas_scale/

The problem was, that my TrueNAS Instance didn't provide any of the tools suggested here, so I needed to customize my own image to get this working.

Preparation

Creating the new base image with Debian

• cd into the path of the custom base image Dockerfile (influxdata-docker/telegraf/1.33-custom)
• Copy the Dockerfile and the entrypoint.sh from the telegraf folder (e.g.: telegraf/1.33) out of the influxdata-docker Github repository (if you need a new one). I added them here under influxdata-docker/telegraf/1.33-custom with my changes.
• Change the Dockerfile and add these changes:

FROM debian:bookworm

# ...

RUN DEBIAN_FRONTEND=noninteractive apt-get update && \
    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends bash dirmngr gpg gpg-agent iputils-ping snmp procps lm-sensors libcap2-bin wget && \
    rm -rf /var/lib/apt/lists/*

# set default shell to Bash
SHELL ["/bin/bash", "-c"]

# ...

ENV TELEGRAF_VERSION=1.33.1

# ...
# Remove Cert Check to prevent errors
# Wasnt able to fix it without it
wget --no-check-certificate --no-verbose https://dl.influxdata.com/telegraf/releases/telegraf_${TELEGRAF_VERSION}-1_${ARCH}.deb.asc && \
wget --no-check-certificate --no-verbose https://dl.influxdata.com/telegraf/releases/telegraf_${TELEGRAF_VERSION}-1_${ARCH}.deb && \

# ...

• Tag and Push the image to your docker registry: docker build -f Dockerfile . -t <registry>/<path>/telegraf-tns:1.0 && docker push <registry>/<path>/telegraf-tns:1.0

Build the image based on the new debian base image

After the base image was created it is possible to create the telegraf image with the needed tools.

• cd into the root of this repo and build the image for the custom telegraf container with zfs-tools
• Build and push it: docker build -f Dockerfile . -t <registry>/<path>/telegraf-tns-zfs:1.2 && docker push <registry>/<path>/telegraf-tns-zfs:1.2

Deployment

• create a folder on the dataset, where you want to mount the paths with the script first: cd /mnt/dataset/truenas-apps/ for example and create a path mkdir telegraf.
• After that go into that path and run the script: cd /mnt/dataset/truenas-apps/telegraf (--> vim setup.sh and after this chmod +x setup.sh and bash setup.sh).
• Add the content from the container.yaml in TrueNAS under Apps > Discover Apps > Install YAML - Dont forget to change it to your environment (hdd)!

InfluxDB

• Create the bucket if needed and check if data comes in.

Links

• https://github.com/influxdata/influxdata-docker/tree/master/telegraf
• https://github.com/influxdata/influxdata-docker/blob/master/telegraf/1.33/Dockerfile
• https://github.com/influxdata/influxdata-docker/blob/master/telegraf/1.33/entrypoint.sh