docker-networking-demo-sh-mh.txt

SINGLE HOST

example1
========
docker run -d --name c1 -p 8001:80 nginx:1.16.0-alpine
docker run -d --name c2 -p 8002:80 nginx:1.16.0-alpine

docker network create -d bridge --subnet 10.0.0.1/24 bridge1
docker network connect bridge1 c1
docker network connect bridge1 c2

docker network inspect bridge1

docker exec -ti c1 ash
sed -i  's/Welcome to nginx/Welcome to container1/g' /usr/share/nginx/html/index.html
exit

docker exec -ti c2 ash
sed -i  's/Welcome to nginx/Welcome to container2/g' /usr/share/nginx/html/index.html
exit

docker exec -ti c1 ash
curl c1
curl c2


example2
========

docker network create bridge1

docker run -d --name ws1 -p 8001:80 nginx
docker network connect bridge1 ws1


docker run -d --name ws2 -p 8002:80 nginx
docker network connect bridge1 ws2 

docker network inspect bridge1

docker exec -ti ws1 bash
sed -i  's/Welcome to nginx/Welcome to ws1/g' /usr/share/nginx/html/index.html

docker exec -ti ws2 bash
sed -i  's/Welcome to nginx/Welcome to ws2/g' /usr/share/nginx/html/index.html

docker exec -ti ws1 bash
curl ws1
curl ws2


MULTI HOST


On Leader

docker swarm init #capture the o/p of this command
docker network create -d overlay overlay-test
docker network ls
docker network inspect overlay-test
docker service create --name mhnet --network overlay-test --replicas 2 alpine sleep 1d
docker service  ps mhnet
docker ps
docker inspect mhnet.1

On Worker

docker swarm join     --token SWMTKN-1-3cxrsnljwv3mj7fket9e8td5t2gjxpep6fppsabfe36dspnv64-2elecd8hsndg82kmy201h4vnp     10.112.200.254:2377
docker network ls
docker network inspect overlay-test
docker ps
docker service ps mhnet
docker network ls
docker network inspect overlay-test
docker service  ps mhnet
docker inspect mhnet.2.a9nznt064y4kezcdngvdf4ovr 
docker ps


docker exec -it mhnet.2.a9nznt064y4kezcdngvdf4ovr sh
# ping 10.0.0.4
# ping mhnet.1.83fekkgi473ehzx8n1g70jyoy