Propose a low-tech (without registry) deployment of prebuild demos

[EricBoix]

Deploying docker images requires network access and a docker registry. Docker Hub (the default docker registry) now has some usage limitations (number of users, number of push and pulls...) and installing your own (stable with access rights) registry might be quite some work (refer to section at bottom of this page).

What about distributing a docker based application (i.e. possibly using docker compose) on an USB key to be installed on a off-network machine" ? One possibility is to use docker image save ... with docker load < ....

Provide an example with some of our demos.

Notes on deploying a Docker registry

Caveat emptor

• In order to deploy a docker registry you need https i.e. having the proper certificates for your hostname
• In order to avoid unwanted external usage of your registry (overwriting of standard images with compromised versions or simply using resources on your hosts) one needs to setup accounts (is this hard, does-it require ldap...?)
  • Docker registry is accessed through the "/" URL (https:you-hostname/) and hence can collide with other installed (https) services
  • Although registry serves can run as docker containers, in order to have service robustness might require you to run Kubernetes (on Ubuntu use microK8s, minikube or k3d)

Well known registry software:

• Docker registry is easy to install at least in "mirror" mode.
• Harbor is easy to deploy on top Kubernetes and nicely (simple GUI) handles users and authentication.

[EricBoix]

For the time being, the demos rebuild and push their images on a the local/desktop docker deamon. Will re-open this issue when this need reappears (because new usages requiring an independent registry emerged). Closing.