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Efficient Containerization of .NET Applications using dotnet publish
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Jun 19, 2025
This session offers a thorough, practical guide to containerizing .NET applications using dotnet publish, covering the fundamental concepts and benefits of containerization, the necessary environment setup, and the use of dotnet publish for preparing applications for containerization. Conference Website: https://dotnetconference.com šŗ CSharp TV - Dev Streaming Destination http://csharp.tv š C# Corner - Community of Software and Data Developers https://www.c-sharpcorner.com #CSharpTV #CSharpCorner #LiveShow #dotNet #DotNetConf2025
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so this session is about u efficient
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containerization of net application
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using net publish so my name is I'm a
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Microsoft
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MVP so uh first of all why we need to
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contain application so basically when we
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are
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uh like developing and deploying
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application
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uh earier we used to my okay if I'm
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building a net application is my host
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also contains the same version of the
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net installed on that machine or some if
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you are using some other dependencies we
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have to make sure that dependencies are
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already installed on that machine so all
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those problems we were able to fix with
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docker container so when docker
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introduced or containerization
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introduced
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in core we were uh we can just build the
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application and container and we will be
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able to deploy to the source
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so uh basically uh when I started my
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career I used to like say okay it works
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on my machine and my manager and used to
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say okay we are not shipping your
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machine to the client so uh docker
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actually solves that problem by pulling
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everything abstracting everything into
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one or every dependencies everything
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into a single unit and you can deploy
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that unit so these are the various uh
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things why we need to conduct it we'll
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be able to port the applications very
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easily between various
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environments we'll be able to scale so
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for example if I'm running an
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application in uh container I'll be able
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to like say I want to run five instance
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of that
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application i can just say okay my tail
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value is five then I'll be able to run
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it in five
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different different instances and uh
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it's same line so as a developer I can
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focus on okay building the application
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and I don't need to worry about okay in
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my server that dependency is there or
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the same version of net is installed on
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that I don't need to
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worry so uh when in when we starting uh
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like container we need to understand
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okay what all things we need to so we
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need in the traditional container
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session These are the challenge so when
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we are developing a container you need a
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specific file called docker docker file
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so it is a set of instruction what link
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you need to be part of that container
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image so it is manual process like if
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you're using your code you will be able
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to generate it but still there are some
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challenges for example I'm building a
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web AP application file i am adding a I
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created a docker file then I am adding a
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library as a dependency then I have to
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modify my docker file to adjust that
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also i need to copy that i need to
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update the build step to build that
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assembly all those things it should be
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again
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updated that is one issue second is uh
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we want we will be like we have to make
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sure that container runtime is installed
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on my machine so if you're using docker
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or pod man or any other container
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runtime we have to make sure it is
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installed and uh since this is a
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virtualization
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technology either you have to
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install like uh this one WSL or
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virtualization hyperv so all those
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things matter so that we have to enable
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virtualization in your machine if it is
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not usable
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okay you won't be able to do that you
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have to enable WSL all those things and
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in
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PCD we have to conteer more step for
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adjusting the uh again Docker has to be
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installed on the
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pipeline all those things and people
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learning for VN so if you're a net
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developer and you have to learn one more
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thing like you need to understand uh
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yiml you need to create a doctor files
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you need to understand some uh like
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basics of Linux
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um and what are base images how they
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work all those things it may be a little
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all working for a newcomer but it is
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So
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how do net team or Microsoft net
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team resolve these issues uh in from 6
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onwards uh they introduce a new
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capability uh we can publish
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docker images or we can create docker
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images without any container uh
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container running we can use the dot
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publish command to create
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a docker name without any to uh no
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docker file container runtime if
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needed and it's very simple you just
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need to say
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docker you can create a project as a
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docker publish with the uh default
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profile
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command and If you want to customize the
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uh docker image settings you can modify
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the project file and
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update so these are the
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prerequisites uh you need net by SDK and
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container contain again it's optional
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uh if you already installed it good if
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you want to play around and you want to
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test it or um like
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u run in locally all those things you
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need docker or man or any other
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container let's jump into the demo i
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already created an
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uh web a application
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so it's nothing just plain old net web
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ap
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and then uh I am already running docker
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in my
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machine but I don't have any images I
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don't have any
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containers so I'm just going to export
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this command
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[Music]
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uh this is uh everything is 8 uh it was
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uh from 6 onward so it is building a
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image hello world that is the project
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name with a tag tag is basically version
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of thing so tag latest on base image
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Microsoft that is
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the base image from that it is actually
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the kind of kernel for that okay now if
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I say
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docker go here and images you'll be able
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to see it created an
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image let's run it docker run
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[Music]
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so it started as web server uh listening
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on port 80 i don't have any uh like
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uh or any other thing working on my
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machine so it
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is
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and now you'll be able to see okay this
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is warning I'm getting this is actually
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working let me modify that
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log I'm typing
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No and shutting
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down then publish it again
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now if I run this
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again and browse
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again you'll be able to see that
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log so this is the way we'll be able to
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publish the uh content or save document
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now uh there are certain things all
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these things are running on time
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machine but uh sometime if I'm
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publishing to a uh hub or docker hub or
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any container registry so docker or
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container workflow is basically you
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create a container you publish it to a
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container registry and your of stream or
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de deployment team takes that image or
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your whatever KD pipeline takes that
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image and deploy to the that of in
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natur that is the offer
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so if I want to publish to docker hub
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I'm not using container say I'm using
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docker hub so in that scenario I have to
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make sure that my container name instead
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of hello world it should be in the
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format of uh hub
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username/ the image name application
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name so if I want to customize that I
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just need to add a property like this
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container repository this is my docker
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hub username and this is the application
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and now if I do uh
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this Oh sorry i didn't save
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the Now it build a different image so
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Android with the
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latest okay now if I come
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here you'll be able to see
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Android the
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same no
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other and
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uh keeping uh the latest as version is
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not the recommended packing so if I want
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to customize the tag I can do it with
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containment tag
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uh tag containment tag
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element
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so
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here these are the various customization
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options so I'm changing I added a work
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v1 so I'm keeping
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down these things
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value then I'm updating again
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now it came as V1 tag early it
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was now it is
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V1 and
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uh so okay so if you look
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into you'll be able to see Debian and if
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I want to and it's almost 220 MB 2 MB so
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if I want to reduce the size of that
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image I can use alpine image so I'm
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just changing it to al and I'm updating
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the tag as well
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now if I run this
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again and if I go
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here that alane got a smaller footprint
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also 110 m and it's
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al So these are the various ways you can
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connect and uh all these things are
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published to my local registry if I want
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to publish it to a different one what I
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can do I
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can like add a container registry which
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is the container you want you can set
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it yeah okay this is the way you can run
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the
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container and for deploying to docker
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hub you need to uh set these two
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environment container with the username
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and
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password
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let's go
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[Music]
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[Music]
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[Music]
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that open
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i don't have any word or
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anything
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so here I'm uncommenting this
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Um I am publishing again
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now hopefully it will get published
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to Yeah it is actually getting published
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to
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the you see here
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yeah some practices
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[Music]
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no so these are some best practices you
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can follow use physical tags always
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don't use status uh monitor the image
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size so you can optimize the tane or any
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other images you can do security
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scanning uh regularly scan me for so
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there are yeah
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this was to the
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uh so there are some uh tools available
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for security
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yeah these are some resources uh which
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helps you to learn more about it and
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thank you