[doc] adding short starupt on docker

docker/readme.md

+# Welcome to this super short docker quickstart
+
+Done for Ubuntu like setup ;)
+
+
+- [Welcome to this super short docker quickstart](#welcome-to-this-super-short-docker-quickstart)
+- [install docker](#install-docker)
+  - [install it from the official website](#install-it-from-the-official-website)
+  - [troubleshooting](#troubleshooting)
+    - [sudo required](#sudo-required)
+    - [proxy docker](#proxy-docker)
+    - [graphical interface](#graphical-interface)
+- [short example](#short-example)
+  - [from an online image :](#from-an-online-image-)
+  - [building an image (python example) :](#building-an-image-python-example-)
+- [more compelx example, with ports and volume management](#more-compelx-example-with-ports-and-volume-management)
+- [usefull commands](#usefull-commands)
+
+
+
+# install docker
+
+## install it from the official website
+
+refer to the [official website](https://docs.docker.com/engine/install/ubuntu/).
+
+
+## troubleshooting
+
+
+### sudo required 
+```
+sudo groupadd docker
+sudo groupadd docker
+sudo usermod -aG docker $USER
+sudo chmod 666 /var/run/docker.sock
+```
+
+### proxy docker
+
+Firefox
+Manual proxy configuration (exterior)
+
+```
+sudo mkdir /etc/systemd/system/docker.service.d
+sudo vi docker.service.d/http-proxy.conf
+```
+
+```
+[Service]
+Environment="HTTP_PROXY=http://proxy:3128"
+Environment="HTTPS_PROXY=https://proxy:3128"
+```
+
+systemctl show --property=Environment docker
+
+### graphical interface
+
+Running an X11 application inside a docker container
+https://github.com/Erdwolf/docker-xeyes
+
+```
+#Add user to docker group (if not already added)
+sudo usermod -aG docker $USER
+#add permission X server for docker in host system
+xhost +SI:localuser:root
+xhost +
+```
+
+
+test with: 
+```
+docker run -it --rm -v /tmp/.X11-unix:/tmp/.X11-unix -e DISPLAY=$DISPLAY fr3nd/xeyes
+```
+
+# short example
+
+## from an online image : 
+```
+sudo systemctl start docker
+sudo docker run hello-world
+```
+
+@ ISAE think that you are behind a proxy: 
+
+```
+sudo docker run hello-world --env HTTP_PROXY="http://proxy.isae.fr:3128"
+```
+
+## building an image (python example) : 
+
+
+https://docs.docker.com/language/python/build-images/
+
+```
+git clone https://github.com/docker/python-docker
+...
+
+```
+
+# more compelx example, with ports and volume management
+
+check dockerfile of : 
+https://gitlab.isae-supaero.fr/jsatorb-dev/luplink/-/tree/master/luplink
+
+and docker-compose of https://gitlab.isae-supaero.fr/jsatorb-dev/luplink
+
+
+# usefull commands
+
+```
+#bash entry in a container: 
+#(allow you to "play" interactively with a container you are building)
+docker run -ti --entrypoint /bin/bash simu:latest
+
+
+#list all containers
+docker ps -l
+
+#list images
+docker images
+
+#remove unused images
+docker image prune
+
+# also If -a is specified, will also remove all images not referenced by any container.
+docker image prune -a
+
+
+docker rmi celestrak-json-proxy:dev
+docker system prune
+
+sudo systemctl restart docker.service
+
+#cleaning images fail build
+docker rmi e9264bc30511 ad3b287bad08
+
+#iterative mode (rm all at the end)
+docker run   --rm   -it   centos:centos7 bash
+
+#stop all containers:
+docker kill $(docker ps -q)
+
+#remove all containers
+docker rm $(docker ps -a -q)
+
+remove all docker images
+docker rmi $(docker images -q)
+
+
+## if forgetting files in docker : 
+# we suppose that 5b9bc2ac1611 is the container..
+# docker ps to get your container id
+sudo docker cp myFile.py 5b9bc2ac1611:/usr/src/app
+sudo docker cp myDataFile.csv 5b9bc2ac1611:/usr/src/app
+
+```
+