Scott Hanselman

I saw a tweet from a person on Twitter who wanted to know the easiest and cheapest way to get an Web Application that's in a Docker Container up to Azure. There's a few ways and it depends on your use case.

Some apps aren't web apps at all, of course, and just start up in a stateless container, do some work, then exit. For a container like that, you'll want to use Azure Container Instances. I did a show and demo on this for Azure Friday.

Azure Container Instances

Using the latest Azure CLI  (command line interface - it works on any platform), I just do these commands to start up a container quickly. Billing is per-second. Shut it down and you stop paying. Get in, get out.

Tip: If you don't want to install anything, just go to https://shell.azure.com to get a bash shell and you can do these command there, even on a Chromebook.

I'll make a "resource group" (just a label to hold stuff, so I can delete it en masse later). Then "az container create" with the image. Note that that's a public image from Docker Hub, but I can also use a private Container Registry or a private one in Azure. More on that in a second.

Anyway, make a group (or use an existing one), create a container, and then either hit the IP I get back or I can query for (or guess) the full name. It's usually dns=name-label.location.azurecontainer.io.

> az group create --name someContainers --location westus
Location    Name
----------  --------------
westus      someContainers
> az container create --resource-group someContainers --name fancypantscontainer --image microsoft/aci-helloworl
d --dns-name-label fancy-container-demo --ports 80
Name                 ResourceGroup    ProvisioningState    Image                     IP:ports          CPU/Memory       OsType    Location
-------------------  ---------------  -------------------  ------------------------  ----------------  ---------------  --------  ----------
fancypantscontainer  someContainers   Pending              microsoft/aci-helloworld  40.112.167.31:80  1.0 core/1.5 gb  Linux     westus
> az container show --resource-group someContainers --name fancypantscontainer --query "{FQDN:ipAddress.fqdn,ProvisioningState:provisioningState}" --out table
FQDN                                           ProvisioningState
---------------------------------------------  -------------------
fancy-container-demo.westus.azurecontainer.io  Succeeded

Boom, container in the cloud, visible externally (if I want) and per-second billing. Since I made and named a resource group, I can delete everything in that group (and stop billing) easily:

> az group delete -g someContainers 

This is cool because I can basically run Linux or Windows Containers in a "serverless" way. Meaning I don't have to think about VMs and I can get automatic, elastic scale if I like.

Azure Web Apps for Containers

ACI is great for lots of containers quickly, for bringing containers up and down, but I like my long-running web apps in Azure Web Apps for Containers. I run 19 Azure Web Apps today via things like Git/GitHub Deploy, publish from VS, or CI/CD from VSTS.

Azure Web Apps for Containers is the same idea, except I'm deploying containers directly. I can do a Single Container easily or use Docker Compose for multiple.

I wanted to show how easy it was to set this up so I did a video (cold, one take, no rehearsal, real accounts, real app) and put it on YouTube. It explains "How to Deploy Containers cheaply to Azure" in 21 minutes. It could have been shorter, but I also wanted to show how you can deploy from both Docker Hub (public) or from your own private Azure Container Registry.

I did all the work from the command line using Docker commands where I just pushed to my internal registry!

> docker login hanselregistry.azurecr.io
> docker build -t hanselregistry.azurecr.io/podcast .
> docker push hanselregistry.azurecr.io/podcast

Took minutes to get my podcast site running on Azure in Web Apps for Containers. And again - this is the penny pinching part - keep control of the App Service Plan (the VM underneath the App Service) and use the smallest one you can and pack the containers in tight.

Watch the video, and note when I get to the part where I add create an "App Service Plan." Again, that's the VM under a Web App/App Service. I have 19 smallish websites inside a Small (sometime a Medium, I can scale it whenever) App Service. You should be able to fit 3-4 decent sites in small ones depending on memory and CPU characteristics of the site.

Click Pricing Plan and you'll get here:

Be sure to explore the Dev/Test tab on the left as well. When you're making a non-container-based App Service you'll see F1 and D1 for Free and Shared. Both are fine for small websites, demos, hosting your github projects, etc.

If you back up and select Docker as the "OS"...

Again check out Dev/Test for less demanding workloads and note B1 - Basic.

The first B1 is free for 30 days! Good to kick the tires. Then as of the timing of this post it's US$32.74 (Check pricing for different regions and currencies) but has nearly 2 gigs of RAM. I can run several containers in there.

Just watch your memory and CPU and pack them in. Again, more money means better perf, but the original ask here was how to save money.

To sum up, ACI is great for per-second billing and spinning up n containers programmatically and getting out fast) and App Service for Containers is an easy way to deploy your Dockerized apps. Hope this helps.

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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