Confused about docker swarm mode networking

General
1

Hi, I am a little confused about docker swarm mode networking and how to actually bring up the website/service I have created.

first I have a 2 machine swarm setup with a manager and a worker. I have created a service using

docker service create --replicas=2 -p 80:80 --name NameofService imagename

This creates a service on both manager and worker. So far so good.

If I go to the http://manager_IPaddr the site does not render

if I do a docker inspect NameofService I see a virtual IP set

10.255.0.30/16

If I go to http://10.255.0.30 my site renders… http://10.255.0.31 it does not.

If I want to be able to access this site from external to this box http://10.255.0.30 is not going to work. Also each time I create a new service its going to generate a new virtual IP.

is there any documentation that would help show us what to do here and how to access the site from external to this 2 machine docker env?

thanks

2

Hello,

a lot of information there: https://docs.docker.com/v17.09/engine/swarm/networking/#attach-a-service-to-an-overlay-network

I guess what you want is to use the ingress network so you can access your service from any nodes IP. If you need, you can then add a load balancer or a set keepalived on all nodes so you can have a floating IP that you will set as the NAT for your router.

Torpi

3

Thanks for the reply.

I understand that but for some reason, I can only get to the service from the ingress IP that I see from

docker inspect NameofService

It seems like I cant get to the service through the node IP itself. I have 2 nodes and neither one renders the simple service(website)

is it because I set the port as 80?