Simple Heroku app

by lekkimworld


Simple Redis App

Super simple demo counter-app using Redis for state used to demonstrate deployment to Heroku and Azure.


Create the following environment variables:

  • REDIS_URL redis:// like URL to connect to Redis instance

(usually used with Heroku)


  • REDIS_HOSTNAME Hostname for Redis instance
  • REDIS_PORT Port for Redis instance
  • REDIS_PASSWORD Password for Redis instance

(usually used with Azure)

Deployment to Heroku

By far the easiest approach to deploying on Heroku is simply using the below button. If will create the app on Heroku and deploy the source directly from Github.


Provision compute and push app

export HEROKU_APP_NAME=my-redis-demo-$(date +%s)
export HEROKU_REDIS_SKU=hobby-dev

# create app - if the local directory is a git repo we automatically set a remote
heroku apps:create --region eu $HEROKU_APP_NAME
heroku addons:create --app $HEROKU_APP_NAME heroku-redis:$HEROKU_REDIS_SKU --wait
git push heroku master
heroku open

Destroy app on Heroku

heroku apps:destroy --app $HEROKU_APP_NAME --confirm $HEROKU_APP_NAME

Deployment to Azure

The below steps deploys the source directly from Github. If you need an example of how to deploy the source from a local git repository see my simple-postgres-app repo on Github.

Provision compute on Azure

export AZ_APP_PREFIX=my-redis-demo-$(date +%s)
export AZ_LOCATION=northeurope
export AZ_REDIS_SKU=Basic
export AZ_REDIS_VM_SIZE=c0

# create a resource group to logically contain everything
az group create --location "$AZ_LOCATION" --name "$AZ_APP_PREFIX-resourcegroup"

# create a redis instance
az redis create --location "$AZ_LOCATION" --resource-group "$AZ_APP_PREFIX-resourcegroup" --name "$AZ_APP_PREFIX-redis" --sku $AZ_REDIS_SKU --vm-size $AZ_REDIS_VM_SIZE --minimum-tls-version 1.2

# create an app service plan (the compute) and the app service (webapp) in the plan
az appservice plan create --name "$AZ_APP_PREFIX-appplan" --resource-group "$AZ_APP_PREFIX-resourcegroup" --is-linux --location "$AZ_LOCATION" --sku $AZ_APPSERVICE_SKU --number-of-workers 1
az webapp create --name "$AZ_APP_PREFIX-appservice" --resource-group "$AZ_APP_PREFIX-resourcegroup" --plan "$AZ_APP_PREFIX-appplan" --runtime "node|10.14"

# get access key for Redis and set into web app
export AZ_REDIS_PRIMKEY=`az redis list-keys --name "$AZ_APP_PREFIX-redis" --resource-group "$AZ_APP_PREFIX-resourcegroup" | jq ".primaryKey" -r`
echo "Azure Redis Primary Key: $AZ_REDIS_PRIMKEY"
az webapp config appsettings set --name "$AZ_APP_PREFIX-appservice" --resource-group "$AZ_APP_PREFIX-resourcegroup" --settings REDIS_HOSTNAME="$" REDIS_PORT=6380 REDIS_PASSWORD="$AZ_REDIS_PRIMKEY"

# optionally wait for Redis to provision (can take quite a while)
while [ $(az redis show --resource-group "$AZ_APP_PREFIX-resourcegroup" --name "$AZ_APP_PREFIX-redis" | jq ".provisioningState" -r) = "Creating" ]; do echo "Waiting - Redis instance still in 'Creating' state..."; sleep 10s; done

Deploy source to Azure from Github

# deploy source
az webapp deployment source config --name "$AZ_APP_PREFIX-appservice" --resource-group "$AZ_APP_PREFIX-resourcegroup" --repo-url --branch master

Open app on Azure

# get hostname and open
export AZ_HOSTNAME=`az webapp show --name "$AZ_APP_PREFIX-appservice" --resource-group "$AZ_APP_PREFIX-resourcegroup"  | jq ".hostNames[0]" -r`
open "https://$AZ_HOSTNAME"

Scale out/in on Azure

az appservice plan update --name "$AZ_APP_PREFIX-appplan" --resource-group "$AZ_APP_PREFIX-resourcegroup" --number-of-workers 1

Delete services on Azure

az group delete --name "$AZ_APP_PREFIX-resourcegroup"