Five steps for migrating applications to containers

space gray iPhone X

In general, it's a good thing that people want to use your app. However, application popularity comes at a price when the application is running on the server. As user demand for resources increases, at some point you may find that you need to extend your application. One option is to add more servers in this case and set up a load balancer like Nginx to meet the demand.

However, this approach can be expensive because running instances of your application on servers with no traffic will not save resources when demand is low. The advantage of a container is that it is non-persistent, starting new instances when the need arises, and fading away as the need diminishes. If this sounds like the functionality you need, now might be the time to migrate your application to containers.

Migrating applications to containers can quickly become disoriented. While the environment inside the container may feel familiar, many container images are minimized, and they are designed to be stateless. But in a way, that's one of the advantages of containers. Like the Python virtual environment, it is a blank SLATE that allows you to build (or rebuild) your application without the invisible defaults that many other environments provide.

Each migration to cloud services is unique, but there are a few important principles you should keep in mind before porting your applications to containers.

  1. Understand your dependencies
    Porting your application to a container is a great opportunity to learn what your application actually depends on. Because there are few components installed by default beyond the most basic system components, your application is unlikely to run in a container at first.

Before refactoring, determine your dependencies. First, grep through your source code to find include, import, require, use, or any keywords in your language of choice that you use to declare dependencies.

$ find ~/Code/myproject -type f \
    -iname ".java" \
    -exec grep import {} \;

However, it may not be enough to just identify the language-specific libraries you use. Audit dependencies so that you know whether the language itself is running the low-level libraries required, or whether specific modules are functioning as expected.

  1. Evaluate your data store
    Containers are stateless, and when a container crashes or stops running, instances of that container are lost forever. If you want to save data in that container, that data will also disappear. If your application stores user data, all storage must occur outside of the container, somewhere that instances of your application can access.

You can use local storage mapped to a location within the container to store simple application configuration files. This is a common technique for Web applications that require an administrator to provide simple configuration values, such as an administrator's E-mail address, Web site titles, and so on. Such as:

$ podman run \
    --volume /local/data:/storage:Z \

However, you can configure a database, such as MariaDB or PostgreSQL, to share large amounts of data in several containers. For private information, such as passwords, you can configure a confidential stor

For how you need to refactor your code and adjust storage locations accordingly, this might mean changing paths to new container storage mappings, migrating to different databases, or even incorporating container-specific modules.

  1. Prepare your Git repository
    Containers typically pull source code from Git repositories at build time. Once your Git repository becomes the standard source of production-ready code for your application, you must have a plan for managing your Git repository. Have a publish or production branch, and consider using Git hooks to reject unexpected unapproved commits.
  2. Know your build system
    Containerized applications may not have a traditional release cycle. When containers are built, they are pulled out of Git. You can start any number of build systems as part of a container build, but this may mean tweaking your build system to be more automated than in the past. You should refactor your build process so that you have complete confidence that it will work unattended.
  3. Build an image
    Building images doesn't have to be a complex task. You can use an existing container image as a base and tweak it with a simple Docker file. Alternatively, you can build your own image from scratch using Buildah.

To some extent, the process of building containers is as much a part of development as the actual refactoring of code. Containers are built to capture, assemble, and execute your application, so the process must be automated and robust. By building a good mirror, you have built a solid foundation for your application.

The container is changed
If you're new to containers, don't be intimidated by jargon. The container is just another environment. The perceived constraints of containerized development can actually help you focus on your application and better understand how it works, what it needs to run reliably, and what the potential risks are when things go wrong. Instead, this results in the system administrator having far fewer restrictions when installing and running your application, because the container is, by nature, a controlled environment. Take a close look at your code, know what your application needs, and refactor it accordingly.


  1. car detailing kansas city

    Great, thanks for sharing this post.Much thanks again. Really Great.

  2. prostate massage

    Great, thanks for sharing this blog post.Really thank you! Really Cool.

  3. Abrtpails
  4. ambbetx

    Really enjoyed this article.Really looking forward to read more. Great.

  5. Maryanne Uzee

    Great info! I'll be back for more great content. Love reading this stuff.

  6. brain dump


  7. new products supplier

    Enjoyed every bit of your article post.Really thank you! Keep writing.

  8. Reiki
  9. how to make your own dildo

    I really like and appreciate your article.Thanks Again. Much obliged.

  10. feet fetish

    Hey, thanks for the article.Really looking forward to read more. Cool.

  11. this content

    Great, thanks for sharing this blog article.Really looking forward to read more. Really Cool.

  12. اكوام

    Really informative article.Really thank you! Great.

  13. Holistic Health

    Appreciate you sharing, great article post. Keep writing.

  14. Manifesting

    Thanks for sharing, this is a fantastic post.Really thank you! Really Cool.

  15. Kelvin Kaemingk Loan Depot

    Very good article post.Really thank you! Keep writing.


    Thanks for sharing, this is a fantastic post.Much thanks again. Great.

  17. delta8 softgels

    A big thank you for your article.Thanks Again. Fantastic.

  18. cumming dildo

    wow, awesome blog article.Much thanks again. Want more.

  19. mold inspection greenville sc

    wow, awesome blog.Really looking forward to read more. Will read on...

  20. light fixture

    Very good blog post.Much thanks again. Much obliged.

  21. angel baby troye sivan mp3
  22. 사설먹튀검증

    Thanks for the article.Really thank you! Awesome.

  23. rxce

    I am so grateful for your article.Really thank you! Great.

  24. 카지노사이트추천

    Every weekend i used to pay a quick visit this web page, as i wish for enjoyment, as this this web page conations in fact good funny information too.
    great put up, very informative. I wonder why the other experts of this sector don’t notice this. You should proceed your writing.I’m sure, you’ve a huge readers’ base already!
    great page;

  25. Home survey

    I really liked your article post. Fantastic.

  26. maltepe istanbul otel

    I appreciate you sharing this blog post.Really looking forward to read more. Really Great.

  27. Still Life Bigbang

    Very neat blog.Really looking forward to read more. Want more.

  28. Reiki

    I cannot thank you enough for the article.Thanks Again. Cool.

  29. bathroom laundry renovations

    Awesome post.Really looking forward to read more. Great.

  30. gudang download lagu

    Really informative blog.Really looking forward to read more. Great.

  31. aplikasi penghasil uang

    Your style is really unique in comparison to other people I've read stuff from. I appreciate you for posting when you have the opportunity, Guess I will just book mark this blog.

  32. trust club

    Very good blog post.Really looking forward to read more. Will read on...

  33. rysupaudio

    wow, awesome blog.Much thanks again. Really Cool.

  34. download lagu

    This is a great tip particularly to those fresh to the blogosphere. Short but very precise information… Many thanks for sharing this one. A must read article!

  35. how to order a fake id

    Major thankies for the post.Really thank you! Cool.

  36. fag bearing

    Thank you ever so for you blog post.Thanks Again. Want more.

  37. self lubricating masturbator

    Really appreciate you sharing this blog article.Thanks Again. Great.

  38. g vibe toy

    Really appreciate you sharing this blog post. Much obliged.

  39. most realistic dildo

    I value the article post. Really Cool.

  40. rummy wealth apk

    Im thankful for the article post. Keep writing.

  41. ummy gold apk

    A big thank you for your article post.Thanks Again. Cool.

  42. rxce apk

    I appreciate you sharing this article.Really looking forward to read more.

  43. rummy gold

    Im grateful for the article post. Want more.


Related recommendation

No related articles!


Five steps for migrating applications to containers