How to setup docker swarm like env using weave net

The procedure to setup docker swarm on two nodes using weave net

Create two VirtualBox Ubuntu VMs with the following settings:

1. Host-only network and NAT network
2. Each machine resolves the two hosts to their NAT IP addresses
3. Two machines can ping each other using host name

Install docker on each machine:

sudo apt-get install docker.io

Download weave net and make it executable on each machine:

sudo curl -L git.io/weave -o /usr/local/bin/weave
sudo chmod a+x /usr/local/bin/weave

On the first machine(u1710-1), run the following commands:

weave launch
eval $(weave env)

On the second machien(u1710-2), run the following commands:

weave launch u1710-1
eval $(weave env)

Use the follow procedure to test containers running on two machines can talk to each other

1. Start a container on the first machine by running the following command:

docker run --name box1 -it --rm busybox

2. Start a container on the second machine by running the following command, then ping first container:

docker run --name box2 -it --rm busybox
# ping -c2 box1

If one container can ping the other, then you have successfully setup weave net. The containers that you created should be able to ping outside of the world as well.


Note:
1. If you restart your machine, you will need to always run the following command before you start any new container, this is to make sure that your DOCKER_HOST environment varilable gets setup correctly.
2. The procedure has been also tested on aws and openstack cloud. Using the free tier VMs, you will be able to do the same as you do on VirtualBox. If you do this in your cloud environment, the security group will need to include rules to allow port on TCP 6783 and UDP 6783/6784, and TCP 6782 (monitoring) to be open. Of course, it will be also helpful if you allow ICMP traffic and ssh (22) so that you can easily test your connectivity.