"Docker is managed via upstart, try using service docker restart" - baffling advice ?

Presumably every docker user has already followed this advice and experienced a baffling message "unkown job docker". There are quite a lot of questions and some bug reports in the net, but seemingly no satisfying answers. The question seems to me: "What is upstart?" Here is my own workaround.

Vagrant vs. VirtualBox ? - A false contradiction

"Why should I use Vagrant instead of just VirtualBox?" - There are quite a lot of questions and answers of that type  in the net. The questioners seem to belong to the group of operations engineers, e.g. application supporters, database administrators, etc. The answerers seem to belong to the group of developers. Hence my first clue on this queer debate is, that it may be a question of conflicting priorities in the field of the Devops movement.

Vagrant on Windows

Refers to train.oracle12.migration

The Problem

People focussed on Windows have problems in understanding and setting up vagrant projects on their machines. They simply don't like the commandline and insist on "clicking in GUIs". If one pretends to work seriously, he must not be attached to this attitude. Here are the basic steps.

In-Memory Database Columnar Technology in a VirtualBox

Refers to train.oracle12.migration

The Problem
You have imported the user OE into the pluggable database PDB1 inside your guest VM. Now you want to test the In-Memory features of Oracle12c.

Git & Vagrant for Dummies

Refers to github project train.oracle12.migration

The Shortest Introduction Possible for Oracle IT Crowd

Some friends in the Oracle IT Crowd have problems to understand and setup my project. Here are the basic steps.

Upgrade impossible for Oracle 11.2.0.1 ?

This refers to github project train.oracle12.migration

The Problem

Oracle 11.2.0.1 is said to be impossible to upgrade to Orarcle12c. This is only partially true. There are generally  4 methods to upgrade to Oracle12c

Oracle's SQLDeveloper and Vagrant

Refers to github project train.oracle12.migration

The Problem

You want to run your SQLDeveloper on the host and you want to let it work on the databases inside the guest VM.  How do we tell SQLDeveloper, that it should connect to the databases inside the guest VM ?