Nginx (LB basics)

## nginx with a path html 
docker run --name nginx --hostname ng1 -p 80:80 -v /Users/mohameda/Documents/Learning/playground/nginx/html:/usr/share/nginx/html -d nginx

## inspect container 
docker inspect nginx

## vanilla nginx 
docker run --name nginx --hostname ng1 -p 80:80 -d nginx

## create  nodeapp 
docker build . -t nodeapp
docker run --hostname nodeapp1 --name nodeapp1 -d nodeapp
docker run --hostname nodeapp2 --name nodeapp2 -d nodeapp
docker run --hostname nodeapp3 --name nodeapp3 -d nodeapp

docker run --hostname ng1 --name nginx -p 80:8080 -v /Users/moabukar/Documents/playground/nginx/nginx.conf:/etc/nginx/nginx.conf -d nginx

## create a docker network
docker network create backendnet
docker network connect backendnet nodeapp1
docker network connect backendnet nodeapp2
docker network connect backendnet nodeapp3
docker network connect backendnet nginx





## spin up another NGINX instance

docker run --hostname ng2 --name nginx -p 81:8080 -v /Users/moabukar/Documents/playground/nginx/nginx.conf:/etc/nginx/nginx.conf -d ng2

docker network connect backendnet ng2

## use ip tables to load balance connections to port 80/81 from 82 this is all outside docker, ip address is 192.168.254.10 

sudo iptables --table nat --append PREROUTING --destination 192.168.254.10 --protocol tcp --dport 82 --match statistic --mode nth --every 3 --packet 0 --jump DNAT --to-destination 192.168.254.10:80

sudo iptables --table nat --append PREROUTING --destination 192.168.254.10 --protocol tcp --dport 82 --match statistic --mode nth --every 2 --packet 0 --jump DNAT --to-destination 192.168.254.10:81



## SNAT
sudo iptables --table nat --append POSTROUTING --destination 192.168.254.10 --protocol tcp --dport 81 --jump SNAT --to-source 192.168.254.10

sudo iptables --table nat --append POSTROUTING --destination 192.168.254.10 --protocol tcp --dport 82 --jump SNAT --to-source 192.168.254.10