Setup

	docker rm $(docker ps -aq)
	docker network rm my_net

Demo

- Install and activate

	yum -y install docker
	systemctl start docker
	systemctl enable docker

	docker images


- Launch pre-canned container:  hello-world (busybox is another good test)

	(optional:)
	docker pull hello-world
	docker run -i -t hello-world

- Show docker-run options

	man docker-run

- Launch pre-canned container:  ubuntu, debian, fedora
	
	docker run -it ubuntu
		cat /etc/os-release
		uname -a
		exit

	docker run -it debian
		cat /etc/os-release
		uname -a
		exit

	# Fedora 27 and earlier, no default command
	docker run -it fedora:27 /bin/bash
		cat /etc/os-release
		exit

	docker run -it fedora:28 
		cat /etc/os-release
		exit
		
- Other commands include stop/start/restart, pause/unpause

- Cleaning up

	docker ps
	docker ps -a
	docker ps -aq
	docker rm $(docker ps -aq)
	

- Finding images
	
	docker search fedora
	docker search --filter stars=200 ubuntu
	docker search httpd

- Launch Apache

	docker run -d -p 8081:80 --name my_server httpd
		wget -qO- http://127.0.0.1:8081/

	docker logs my_server
	docker exec -it my_server /bin/bash
		ps -fe

	(in container) Edit /usr/local/apache2/htdocs/index.html:
		apt-get -y update
		apt-get -y install zile
		zile /usr/local/apache2/htdocs/index.html
		exit

	docker ps
	docker commit my_server my_new_image
	docker kill my_server
	docker ps
	docker ps -a
	docker rm my_server
	docker run -d -p 8081:80 --name my_server my_new_image
		wget -qO- http://127.0.0.1:8081/
	docker kill my_server

- Make modifications to Apache using Dockerfile

	# For illustration, delete old image, or edit Dockerfile to invalidate cache
	docker rmi psfales/apache

	cd DOCKER/psfales_apache
	cat index.html
	cat Dockerfile
	docker build -t psfales/apache .
	docker rm $(docker ps -qa)

- Demonstrate caching by changing index.html

	zile index.html
	docker build -t psfales/apache .
	docker run -d -p 8081:80 --name my_server psfales/apache
	docker kill my_server

- Push to Docker Hub
	(docker login needed the first time)
	docker push psfales/apache

- Networking
	docker network create my_net
	docker network ls
	docker network inspect my_net

	docker run -d --net=my_net --name webserver1 httpd
	docker run -d --net=my_net --name webserver2 httpd

	docker run -it --net=my_net psfales/nettest
		nslookup webserver1
		ping -c3 webserver1
		wget -qO- http://webserver1/
		wget -qO- http://webserver2/

	OR
	docker run -it --net=my_net ubuntu
		apt-get -y update
		apt-get -y install net-tools iputils-ping dnsutils wget
		nslookup webserver1
		ping -c3 webserver1
		wget -qO- http://webserver1/
		wget -qO- http://webserver2/

        # In another host window:docker
	docker network disconnect my_net webserver2

		ping webserver2


- Overlay network (Skip for now - revisit to look at commmands if time permits)
  https://docs.docker.com/network/network-tutorial-overlay/#walkthrough

	Host 1

		docker run -d     -p "8500:8500"     -h "consul"  progrium/consul -server -bootstrap

		docker swarm init
		OR (if host has more than one interface)
		docker swarm init --advertise-addr=<IP-ADDRESS-OF-MANAGER>

		# List nodes (can only be done on manager)
		docker node ls

		docker network create -d overlay --attachable my_overlay
		docker run -d --net=my_overlay -p 8081:80 --name webserver1 httpd	

		docker run -it --net=my_overlay --name net1 psfales/nettest

	Host 2
		(use docker swarm join printed by host 1.  Use
		-advertise-addr <IP-ADDRESS-OF-WORKER-1> if more than
		one interface)

		docker run -d --net=my_overlay -p 8082:80 --name webserver2 httpd

		docker run -it --net=my_overlay --name net2 psfales/nettest
	
			apt-get -y update
			apt-get -y install net-tools iputils-ping dnsutils wget
			nslookup webserver1
			ping -c3 webserver1
			wget -qO- http://webserver1/
			wget -qO- http://webserver2/

- Volumes

	# clean out volume
	rm -rf /tmp/volume

	docker run -it -v /tmp/volume:/datadir ubuntu

- Show build.sh and Dockerfile for rpi-build  
	- based on another image that includes support files, toolchain, etc.
	
	cd ../psfales_rpi-build

	cat Dockerfile
	vi build.sh

	docker build -t psfales/rpi-build .
	docker run -it -v /home/psfales/kernel:/kern  --env KERN_BRANCH=rpi-4.19.y psfales/rpi-build 

- R-Studio

	 docker run -d -e PASSWORD=demo -p 8787:8787 --name rstudio rocker/rstudio
	 login: rstudio, password: demo

	(https://www.harding.edu/fmccown/r/)
	# Define the cars vector with 5 values
	cars <- c(1, 3, 6, 4, 9)
	# Graph cars using blue points overlayed by a line 
	plot(cars, type="o", col="blue")
	# Create a title with a red, bold/italic font
	title(main="Autos", col.main="red", font.main=4)

docker kill rstudio