you're kidding right?

Docker runs as the Container Runtime under most Kubernetes clusters (in fact every Kubernetes cluster I've seen). The only other CRIs that are commonly used are CRI-O and ContainerD (which Docker already uses), and last I saw CRI-O was < 10% of the Container runtime market.

just to make sure i understand what you’re saying : running containers created with the docker tool is ok, and running it with kubernetes is also ok, but actually deploying docker tool on a server to run the container is not. Am i correct ?

Care to explain what makes that docker tool/runtime unsuitable for production ?

I think, when people are talking about "using Docker", they're talking about using Docker tooling to build and push/update/pull Docker images (actually OCI images) around. They're not really talking about running OCI images "on the Docker daemon container runtime." But to most people, OCI images are "Docker" and if your cloud scheduler/hypervisor can run them then it's "a Docker runtime."

Docker daemon is the default runtime for k8s and k8s is most definitely being used in lots of production environments.

I like to believe most people are sufficiently with-the-plot to appreciate that there is a difference between a "container", "container runtime", "container orchestration" and "docker".

No one is seriously confused about "using docker" meaning, oh hey, I run my containers on kubernetes. I have literally never met someone who was confused about this. I suppose some people just stop at "I use docker" and don't know what that means when it hits production... but I'm skeptical they actually think a copy of docker is running out there in prod.

...but to be fair, the parent comment did say that running "docker containers" was mainstream; and fair enough.

My point was running containers using docker most certainly is not.

I don't get your point. Isn't docker the default runtime everywhere? k8s uses docker internally, by default.

So containers are most certainly run in prod using docker (to be specific docker daemon), are they not?

For many people, Docker = container, created using a Dockerfile and deployed to kubernetes or elsewhere, regardless of the actual runtime underneath.

What is the problem with using a container based approach for production workloads?

I’ve wondered about this myself. What is the solution? On premise cloud like openstack?

Most of the industry runs Docker containers in production my dude.

Pretty sure Google App Engine runs Docker under the hood. It has been a while since I logged into a GAE machine.