Selfhosted
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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 and that's mostly BS because 1) systemd can provide as much isolation a docker containers and 2) there are other container solutions that are at least as safe as Docker and nobody cares about them.
Companies such as Microsoft and GitHub are all about re-creating and reconfiguring the way people develop software so everyone will be hostage of their platforms. We see this in everything now Docker/DockerHub/Kubernetes and GitHub actions were the first sign of this cancer. 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.
Note that technologies such as Docker keep commoditizing development - it’s a negative feedback loop 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. At the end of the they the business of those cloud companies is transforming developer knowledge into products/services that companies can buy with a click.
Actually Docker and the success of containers is mostly due to the ease of shipping code that carries its own dependencies and can be run anywhere. Security is a side-effect and definitely not the reason why containers picked-up.
Yes, and it's much harder to achieve the same. In systemd you need to use 30 different options to get what using containers you achieve almost instantly and with much less hussle. I made an example on my blog where I decided to run
blockyin Systemd and not in Docker. It's just less convenient and accessible, harder to debug and also relies on each individual user to do it, while with containers a lot gets packed into the image and therefore harder to mess up.There are a many container runtimes (CRI-O, podman, mirantis, containerd, etc.). Docker is just a convenient API, containers are fully implemented just with Linux native features (namespaces, seccomp, capabilities, cgroups) and images follow an open standard (OCI).
I will avoid comment what looks like a rant, but I want to simply remind you that containers are the successor of VMs (virtualize everything!), platforms that were completely proprietary and in the hands of a handful of vendors, while containers use only native OS features and are therefore a step towards openness.
Successor implies replacement. I think containers are another tool in the toolkit of servers/hosting, but not a replacement for VMs
Well, I did not mean replacement (in fact, most orgs run in clouds which uses VMs) but I meant that a lot of orgs moved from VMs as the way to slice their compute to containers/kubernetes. Often the technologies are combined, so you are right.