Docker is a tool that can package an application and its dependencies in a virtual container that can run on any Linux server. This helps enable flexibility and portability on where the application can run, whether on premises, public cloud, private cloud, bare metal, etc.

Da https://en.wikipedia.org/wiki/Docker_(software)

Docker e la "containerizzazione" sono l'evoluzione di due tecnologie molto "antiche":

Sometimes your windows' HyperV Hypervisor will refuse to start.

The problem is tricky because the services seems started if you check them. Also the installation is successful, virtualization is enabled and so on. So what is wrong?

Use docker in docker to drive docker from a container Working under windows, sometimes docker slow down. Sometimes you need to access to the MobyVM. With this line:

Hosting your own email server is not a mandatory task; it increase your attack surface too. But relaying too much on big emails provider (Gmail, Outlook, Aruba, Fastmail) could be a risk for our democracy. For instance, who decide how Spam is managed (i.e. what could be a Spam email)? Can we trust big providers? Email has legal value, and its content should stay as much as private as possible.

Docker was born for the cloud. It is the easiest way to run different software in a tiny box, installing it in a rapid way and with a nice way to wipe it in a snap. But when docker shines are the little docker compose files, which realize the Infrastructure as Code, a configuration file which declare in an easy and simple way how services are connected.

[UPDATED 21/3/2022]

I have a shiny mail server on gioorgi.com. I decided to manage it on first person because it is important to have tight control on your email, in my humble opinion. It is not strictly necessary, but lending your email address to big company like Googles, Microsoft, Yahoo and so on could be a issue if you get banned by them for whenever reason.

Misterio is a  docker-compose based Ansible alternative.

Why

Dopo Amazon, Google  e Azure, anche Oracle è entrata nel mercato Cloud. Nell'ultimo periodo Oracle Cloud propone in modo aggressivo con lo slogan "Always Free" una serie di risorse che saranno sempre disponibili senza accrediti ulteriori. Ovviamente non è tutto oro quello che luccica ma...abbiamo fatto un paio di prove per saggiare questo servizio.

K8s is a very complex beast. But it give you a very good set of security defaults, and it is also a very well done implementation of a microservice application.