In addition to the huge number of containers, you could even upload your own Azure custom IaaS image with Docker/container services enabled:

The way described previously is in general not the way you should provide containers in a cloud environment. With Azure we have easier ways of doing so, but if you need it, you could do it that way. As with Azure, you will have the option to order a container directly in Azure as an Azure Container Instance (ACI) or a managed Azure solution using Kubernetes as orchestrator, which we will talk about later in this chapter.