Building a Stand Up Bot for Slack - Prereqs

Published on Monday, 19 August 2019
Open-faas Slack Kubernetes Helm

Building a Stand up Bot for Slack

A while back for hack week at work, I started working on a Stand up bot for Slack. Due to a issues around the release of a new product at work, I did not get much time to work on the bot. I have decided to use my 10% time to work on the bot but I am going to approach it from a different way then what we had done for hack week.

Functions everywhere

I will be building this with each part of the bot as a separtate function. These function will be hosted in Open-faas.

Prerequisites

  • A Kubernetes Cluster
  • Helm
  • Open-faas cli

Setting up Open-fass

To start with you need to have a Kubernetes cluster to host Open-faas. For local testing, I am using Docker for Windows with Kubernetes enabled. Deploying Open-fass is fairly easy.

  • First install tiller into Kubernetes.
>kubectl -n kube-system create sa tiller
>kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
helm init --skip-refresh --upgrade --service-account tiller
  • Then add namespaces for Open-faas
 kubectl apply -f https://raw.githubusercontent.com/openfaas/faas-netes/master/namespaces.yml
  • Get the helm repro for Open-faas
helm repo add openfaas https://openfaas.github.io/faas-netes/
  • Use helm to install Open-faas
helm upgrade openfaas --install openfaas/openfaas --namespace openfaas  --set functionNamespace=openfaas-fn --set operator.create=true
  • Check if the deploy worked
kubectl --namespace=openfaas get deployments

should look like

NAME           DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
alertmanager   1         1         1            1           1d
gateway        1         1         1            1           1d
nats           1         1         1            1           1d
prometheus     1         1         1            1           1d
queue-worker   1         1         1            1           1d