# Network Setup Guide

This guide demostrates a network setup that will work for environments with access to layer 2 networking 
(bare metal, vmware, etc). The following steps are not required when following the [Installation Guide](coreos_cloud_config.md).

## Hostnames

On each node ensure the hostname is set.

```
hostnamectl set-hostname master
hostnamectl set-hostname node1
hostnamectl set-hostname node2
```

### Setup /etc/hosts

On each node add the following lines to /etc/hosts:

```
192.168.12.10 master
192.168.12.11 node1
192.168.12.12 node2
```

## Create the cbr0 bridge

On each node run the following commands to setup the cbr0 bridge used by Docker and Kubernetes.

```
brctl addbr cbr0
brctl addif cbr0 ens34
ip link set dev cbr0 mtu 1460
ip addr add 10.244.0.1/24 dev cbr0   # this will be different for each minion
ip link set dev cbr0 up
ip route add 10.0.0.0/8 dev cbr0
```

Each node should use a different address. For example:

master

```
ip addr add 10.244.0.1/24 dev cbr0
```

node1

```
ip addr add 10.244.1.1/24 dev cbr0
```

node2

```
ip addr add 10.244.2.1/24 dev cbr0
```

## Configure IP tables

On each node run the following command to allow containers to reach the internet.

```
iptables -t nat -A POSTROUTING -o ens33 -j MASQUERADE \! -d 10.0.0.0/8
```