Mermin with OpenTelemetry Collector

• Mermin with OpenTelemetry Collector

  • Overview

  • Install

    • Debug charts

Overview

This example deploys Mermin with the OpenTelemetry Collector for testing purposes. The OpenTelemetry Collector's output is set to debug (stdout), and has been tested by using Kind

Notes on the example deployment:

• Location in the repository - docs/deployment/examples/local_otel

• Deployment happens in the "current" namespace

• You may optionally customize and use config.hcl instead of the default config.

• Mermin values use mermin:latest image, it is expected you build it and load to your K8s cluster

Install

• Create a values file for the OTEL Collector with contents or use one from the repo

• Deploy the OTEL Collector chart

  # Deploy OpenTelemetry Collector
  helm repo add open-telemetry https://open-telemetry.github.io/opentelemetry-helm-charts
  helm upgrade -i -n default \
    -f values_otel.yaml \
    otel-collector open-telemetry/opentelemetry-collector

• Create config file for the Mermin with contents or use one from the repo

• Deploy the Mermin chart

  helm repo add mermin https://elastiflow.github.io/mermin/
  helm upgrade -i --wait --timeout 15m -n default \
    --set-file config.content=config.hcl \
    --devel \
    mermin mermin/mermin

• Optionally install metrics-server to get metrics if it has not been installed yet

  kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.8.0/components.yaml
  # Patch to use insecure TLS, commonly needed on dev local clusters
  kubectl -n kube-system patch deployment metrics-server --type='json' -p='[{"op":"add","path":"/spec/template/spec/containers/0/args/-","value":"--kubelet-insecure-tls"}]'

Debug charts

In order to render K8s manifests you may use following commands

• OpenTelemetry Collector

  rm -rf helm_rendered; helm template \
    -f values_otel.yaml \
    otel-collector open-telemetry/opentelemetry-collector \
    --output-dir helm_rendered
  
  # Diff with existing K8s resources
  kubectl diff -R -f helm_rendered/mermin/    

• Mermin

  rm -rf helm_rendered; helm template \
    --set-file config.content=config.hcl \
    --devel \
    mermin mermin/mermin \
    --output-dir helm_rendered
  
  # Diff with existing K8s resources
  kubectl diff -R -f helm_rendered/mermin/