Azure App Services Web Apps Configuration - Versioning

Working with Azure App Services Web Apps, I learned how it’s difficult to don’t have integrated versioning of the configuration.

This is my solution.

My setup

It’s always better to have a distributed system that requests/processes everything in parallel.

Nomad has the parameterized job type, it’s one of my actual tools for this versioning.

I can run any command specifying parameters like the ones that I use:

• region_prefix
• environment_name
• component_name
• prefix

Using this type of job, I avoid redundancy… I always reuse the same job specification and I just need to run curl or Nomad cli in parallel to trigger the job for different Web Apps.

Another good solution is using a scheduler like Apache Airflow and a database with columnar compression (like PostgreSQL with columnar compression from Citus).

The neutral solution

A simple bash script, implementing a basic usage (= non-parallelized) with git for the versioning.

#!/bin/bash

WEBAPP_CONF() {
    local region_prefix=$1
    local environment_name="$2"
    local component_name="$3"
    local prefix="$4"
    local resource_group_name="${region_prefix}-rg-syy-${environment_name}-app-wa"
    local webapp_name="${region_prefix}-wac-syy-${environment_name}-app-${component_name}"
    echo "Dumping $region_prefix $environment_name $component_name config"
    az webapp config show --name "$webapp_name" --resource-group "$resource_group_name" >"$prefix"/"${environment_name}_${component_name}_webapp_config".json
    az webapp config appsettings list --name "$webapp_name" --resource-group "$resource_group_name" >"$prefix"/"${environment_name}_${component_name}_webapp_config_appsettings".json
}

DEV() {
    WEBAPP_CONF eaus dev sc1 DEV
    WEBAPP_CONF eaus dev sc2 DEV
    WEBAPP_CONF eaus dev sc3 DEV
}

QA() {
    WEBAPP_CONF eaus qa sc1 QA
    WEBAPP_CONF eaus qa sc2 QA
    WEBAPP_CONF eaus qa sc3 QA
}

PREPROD() {
    WEBAPP_CONF eaus preprod sc1 PREPROD
    WEBAPP_CONF eaus preprod sc2 PREPROD
    WEBAPP_CONF eaus preprod sc3 PREPROD
}

PROD() {
    WEBAPP_CONF eaus prod sc1 PROD
    WEBAPP_CONF eaus prod sc2 PROD
    WEBAPP_CONF eaus prod sc3 PROD
}

GIT_COMMIT() {
    local cmd_arg=$1
    git add .
    git commit -am "Auto-commit ($cmd_arg)"
    git push
}

usage(){
    echo "Usage: $0 <environment>"
    echo "  environment: all, dev, qa, preprod, prod"
    exit 1
}

if [ "$#" -ne 1 ]; then
    usage
fi

case "$1" in
    all)
        DEV
        QA
        PREPROD
        PROD
        GIT_COMMIT all
        ;;
    dev)
        DEV
        GIT_COMMIT dev
        ;;
    qa)
        QA
        GIT_COMMIT qa
        ;;
    preprod)
        PREPROD
        GIT_COMMIT preprod
        ;;
    prod)
        PROD
        GIT_COMMIT prod
        ;;
    *)
        usage
        ;;
esac