made a makefile

+ added names of images and container in compose
+ have a functionnal nginx dockerfile

README.md

@@ -15,6 +15,20 @@ This README would normally document whatever steps are necessary to get your app
 - `sudo netstat -tulpn` to print network connections and see if nginx is running
 - or : `ps -ax | grep nginx`
 - `sudo nginx -s quit` to stop it
+- `sudo docker system prune -af --volumes` -> `-a` also unused images, `-f` without prompt for confirmation
+	- remove stopped containers
+	- remove unused networks
+	- remove unused images
+	- remove build cache
+- `sudo docker ps -q` all runnings containers
+- `sudo docker stop $(sudo docker ps -q)` stop all runnings containers
+**remove project images**					rm-images		sudo docker image rm -f <name> <name> ...
+**stop   project containers**				stop			sudo docker stop <name> <name> ...
+**remove project containers**				rm-containers	sudo docker rm <name> <name> ...
+**remove project images and containers**	clean			rm-images stop rm-containers
+**remove project volumes**					rm-volumes		sudo docker volume rm -f <name> <name> ...
+**remove project**							fclean			clean rm-volumes
+**remove all dockers**						ffclean			sudo docker stop $(sudo docker ps -q); sudo docker system prune -af --volumes
 
 ---
 ## Dockerfile basics
@@ -28,12 +42,25 @@ This README would normally document whatever steps are necessary to get your app
 
 - [download alpine linux](https://alpinelinux.org/downloads/)
 - [dockerhub alpine image](https://hub.docker.com/_/alpine)
+- [docker starter guide](https://docs.docker.com/get-started/)
 - [docker glossaire](https://docs.docker.com/glossary/)
 - [Dockerfile syntaxe](https://docs.docker.com/engine/reference/builder/)
 - [determine the parent image](https://forums.docker.com/t/determine-the-parent-image/48611)
 - [docker image from scratch](https://codeburst.io/docker-from-scratch-2a84552470c8)
 - [build context and image context](https://stackoverflow.com/questions/55108649/what-is-app-working-directory-for-a-dockerfile/55109065#55109065)
+- [nginx begginer guide](https://hub.docker.com/_/nginx/)
+
+#### docker pid 1
+
+- nginx by default will create some child process (a master and some workers), then it quits (doc ?)
+- when the first process of a docker container exit, the container exit (doc ?)
+- so we must tell nginx to not go background : "-g 'daemon off'"
 - [pid1 docker problem](https://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem/)
+- [official nginx docker image](https://hub.docker.com/_/nginx/)
+- "If you add a custom CMD in the Dockerfile, be sure to include -g daemon off; in the CMD in order for nginx to stay in the foreground, so that Docker can track the process properly (otherwise your container will stop immediately after starting)!"
+- [SO discussion on "-g 'daemon off'"](https://stackoverflow.com/questions/18861300/how-to-run-nginx-within-a-docker-container-without-halting)
+- "When PID 1 exits, the container will exit" (where is says in the doc ?)
+- ["By design, containers started in detached mode exit when the root process used to run the container exits"](https://docs.docker.com/engine/reference/run/#detached--d)
 
 #### install and use docker and compose
 
@@ -64,9 +91,11 @@ This README would normally document whatever steps are necessary to get your app
 **build and run a docker image**
 - be in directory with a Dockerfile
 - `sudo docker build --tag <name> .`
-- `sudo docker images` to list images
 - `sudo docker run <name>`
-- `sudo docker image rm -f <number-id>`
+- `sudo docker images` to list docker images
+- `sudo docker image rm <number>`
+- `sudo docker ps` to list docker processes
+- `sudo docker ps rm <name>`
 **execute a docker-compose file**
 - be in directory with a docker-compose.yml file
 - `sudo docker-compose up`