Watch Starwars with Docker

ASCII Version of Starwars

Found in "Orchestrating Docker" by Shrikrishna Holla   - I love this book. Here is the code.

Start Oracle Dataguard Training with the most simple Dockerfile

Refers to our Docker-Dataguard-Project

After a long absence I feel obliged to bring this project to an end. Therefore I start my works with the most simple Dockerfile

Click on the picture to enlarge

Tricky: docker, oraclelinux, ubuntu and ulimit -Hn

Virtualization is said to bee good for training and development, but  it should be kept out from productive environments. Some people, to whom I belong, meanwhile changed their minds and are convinced, that e.g. docker containers running ubuntu or oraclelinux, breed85/oracle12c or alike will play an increasing role in data virtualization. See also oaktable-world-agenda-2015/ To get experience and clarify certain questions we have created a Docker Project on github. This story here came up with the number of open files in a system (ulimit -Hn), crucial for productive systems. The issue discussion serves best to  understand the impact and the trickyness of the question. For whom it may concern, it is published here.

Docker & oracle-rdbms-server-12cR1-preinstall

There is an extremely annoying  behavior of oracle-rdbms-server-12cR1-preinstall, when you want to use it in conjunction with docker images like breed85 or oraclelinux: this official package of Oracle's blocks every attempt to switch to the user oracle (su - oracle), which one is forced to do, when he wants to install Oracle SW and create Oracle databases in a Docker container. I have written 2 posts in July about that and none of them was correct. After 2 months I was forced to come back in order to accomplish our Dockerproject . Here is, what I have found out.

"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.