Hi, I’ve been thinking for a few days whether I should learn Docker or Podman. I know that Podman is more FOSS and I like it more in theory, but maybe it’s better to start with docker, for which there is a lot more tutorials. On the other hand, maybe it’s better to straight up learn podman when I don’t know any of the two and not having to change habits later. What do you think? For context, I know how containers works in theory, I know some linux I think well, but I never actually used docker nor podman. In another words: If I want to eventually end up with Podman, is it easier to start with docker and then learn Podman, or start with Podman right away? Thanks in advance
I don’t like this Docker trend because, besides what you’ve said, it 1) leads you towards a dependence on property repositories and 2) robs you from the experience of learning Linux (more later on) but I it does lower the bar to newcomers and let’s you setup something really fast. In my opinion you should be very skeptical about everything that is “sold to the masses”, just go with a simple Debian system (command line only) SSH into it and install what you really need, take your time to learn Linux and whatnot.
And the second danger there is that when developers don’t have to consider the setup of a their solution the code tends to be worse. Why bother with having single binaries, stuff that is easy to understand and properly document things when you can just pull 100 dependencies and compose files? :) This is the unfortunate reality of modern software.
See? Poorly written software. Not designed to be sane and reasonable and integrate with existing stuff.
Your article said it all and is very well written. Let me expand a bit into the “different issues”:
The thing with Docker is that people don’t want to learn how to use Linux and are buying into an overhyped solution that makes their life easier without understanding the long term consequences. Most of the pro-Docker arguments go around security, reproducibility and that’s mostly BS because 1) systemd can provide as much isolation a docker containers and 2) there are other container solutions and nobody cares about them.
Companies such as Microsoft and GitHub are all about re-creating and re-configuring the way people develop software so everyone will be hostage of their platforms - that’s why nowadays everything and everyone is pushing for Docker/DockerHub/Kubernetes, GitHub actions and whatnot. We now have a generation that doesn’t understand the basic of their tech stack, about networking, about DNS, about how to deploy a simple thing into a server that doesn’t use some Docker BS or isn’t a 3rd party cloud xyz deploy-from-github service.
Before anyone comments that Docker isn’t totally proprietary and there’s Podman consider the following: It doesn’t really matter if there are truly open-source and open ecosystems of containerization technologies. In the end people/companies will pick the proprietary / closed option just because “it’s easier to use” or some other specific thing that will be good on the short term and very bad on the long term.
Docker may make development and deployment very easy and lowered the bar for newcomers have the dark side of being designed to reconfigure and envelope the way development gets done so someone can profit from it. That is sad and above all set dangerous precedents and creates generations of engineers and developers that don’t have truly open tools like we did. There’s LOT of money into transitioning everyone to the “deploy-from-github-to-cloud-x-with-hooks” model so those companies will keep pushing for it.
At the end of the day technologies like Docker are about commoditizing development and about creating a negative feedback loop around it that never ends. Yes, I say commoditizing development because if you look at it those techs only make it easier for the entry level developer and companies instead of hiring developers for their knowledge and ability to develop they’re just hiring “cheap monkeys” that are able to configure those technologies and cloud platforms to deliver something.
Successful cloud companies are not longer about selling infrastructure, we’re past that - the profit is now in transforming developer knowledge into products/services that can be bought with a click.
You can host your own container repository and write your own docker files to control all your own deployments though, it’s not like your have to be at the behest of any company to use containerization to make your own life easier with the benefits of reproducibility.
Do you write all the programs you use too or do you rely on the work of others and are drawing an arbitrary line in the sand when it comes to containerising those apps?
Yes, I can, but this not about what I or you can do. This is about what the actually do, the direction technology is taking and the lack of freedoms that follows. Distribution is important.
Do you object to software repositories that install dependencies precompiled?
Your “lines in the sand” seem idiosyncratic and arbitrary. You are happy presumably to use precompiled software or at the very least rely on software written by others which is already ceding some freedom but then claim that using systems that package all the dependencies into a single runnable unit is too much and cedes too much freedom?
I agree that containers are allowing software projects to push release engineering and testing down stream and cut corners a bit but that was ever the case with precomplied releases that were only tested on a single version of a single distro.
Look this isn’t even about “drawing lines in the sand”, I do understand why use containers and I use them in certain circumstances, usually not Docker but that’s more due to the requirements in said circumstances and not about personal decision.
No and I never claimed that. I’m perfectly happy to use a single-binary statically linked applications, in fact I use quite a few such as FileBrowser and Syncthing and they’re very good and reasonable software. Docker however isn’t one of those cases or, at least, not just that.
Docker is being used and abused for cutting corners and now we’ve developers that are just unable to deploy any piece of software without it. They’ve zero understanding of infrastructure and anything related to it and this has a big negative impact on the way they develop software. I’m not just talking about FOSS projects, we see this in the enterprise and bootcamps as well.
Docker is a powerful thing, so powerful it opens the door for poorly put together software to exist and succeed as it abstracts people from having to understand architectures, manually install and configure dependencies and things that anyone sane would be able to do in a lifetime. This is why we sometimes see “solutions” that run 10 instances of some database or some other abnormality.
Besides all that, it adds the half-open repository situation on top. While we can host repositories and use open ones the most common thing is to see everything on Docker Hub and that might turn into a CentOS style situation anytime.