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---
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type: post
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title: "Tip 46 - Run an app inside a Container Image with Docker"
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excerpt: "Learn how to create an app that runs inside a container image with Docker"
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tags: [Containers]
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date: 2017-11-06 17:00:00
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---
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::: tip
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:bulb: Learn more : [Azure for Containers](https://docs.microsoft.com/azure/containers/?WT.mc_id=docs-azuredevtips-azureappsdev).
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:tv: Watch the video : [How to Run an App Inside a Container Image with Docker](https://www.youtube.com/watch?v=lpr2tO-FCEw&list=PLLasX02E8BPCNCK8Thcxu-Y-XcBUbhFWC&index=37?WT.mc_id=youtube-azuredevtips-azureappsdev).
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:::
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### Run an app inside a Container Image with Docker
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#### Containers for the rest of us
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For some reason, I find containers are confusing and my goal with my [Azure Tips and Tricks](https://michaelcrump.net/azure-tips-and-tricks-complete-list/) is to try to make things easier. In this mini-series, I'll walk you through [Docker](https://www.docker.com) and how I use it with Azure. Below is a list of post that you can expect for this week.
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* [Azure Tips and Tricks Part 45 - Getting Started with Docker and Azure](tip45.html)
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* [Today - Azure Tips and Tricks Part 46 - Run an app inside a Container Image with Docker](tip46.html)
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* [Azure Tips and Tricks Part 47 - Creating a Container Image with Docker](tip47.html)
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* [Azure Tips and Tricks Part 48 - Pushing a Container Image to a Docker Repo](tip48.html)
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#### Create an app to run inside a Container Image with Docker
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Let's continue where we [left off](https://microsoft.github.io/AzureTipsAndTricks/blog/tip45.html) in our last post, which showed how to get started using Docker. We're specifically looking at how I use Docker with Azure in these posts.
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Begin by opening two tabs instances of either command prompt or terminal. In the right tab, enter the following command to see what docker images are available.
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```
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Michaels-MacBook-Pro:~ mbcrump$ docker images
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REPOSITORY TAG IMAGE ID CREATED SIZE
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microsoft/aspnetcore-build latest c0c285a7a306 39 hours ago 1.85GB
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```
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Let's run the following command passing the `run` parameter, an `interactive terminal` and `naming` our app and the `image id` which the first couple of letters (found with the above command) is good enough.
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After this command executes, I'll be inside my container.
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docker run -it --name myapp c0
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I can validate this by running `dotnet --info`
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```
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root@40bac5113803:/# dotnet --info
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.NET Command Line Tools (2.0.2)
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Product Information:
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Version: 2.0.2
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Commit SHA-1 hash: a04b4bf512
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...
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```
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I know this because I don't have dotnet core tools installed on my Mac. Very cool! You now have a running container that has the dotnet core tools with just a couple of commands.
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<img :src="$withBase('/files/dockerazure6.png')">
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We could further validate this by running `uname -r` or just `uname`.
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```
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root@40bac5113803:/# uname -r
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4.9.49-moby
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root@40bac5113803:/# uname
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Linux
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```
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Let's go ahead and create an app. Run through the following commands to create a new `dotnet core console app`.
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root@40bac5113803:~# `mkdir myapp`
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root@40bac5113803:~# `cd myapp`
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root@40bac5113803:~/myapp# `dotnet new console`
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root@40bac5113803:~/myapp# `dotnet restore`
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root@40bac5113803:~/myapp# `dotnet run`
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Hello World!
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<img :src="$withBase('/files/dotnetazure7.png')">
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