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Add note about offline environments 

Internet access is not mandatory as long as the user configures all container image repositories to point to internal container registries, in case of on-premises installation with firewall rules preventing direct Internet access.
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Florent Monbillard 2018-10-01 09:50:48 -04:00 committed by GitHub
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@ -133,7 +133,7 @@ Requirements
- **Ansible v2.4 (or newer) and python-netaddr is installed on the machine
that will run Ansible commands**
- **Jinja 2.9 (or newer) is required to run the Ansible Playbooks**
- The target servers must have **access to the Internet** in order to pull docker images.
- The target servers must have **access to the Internet** in order to pull docker images. Otherwise, additional configuration is required (See [Offline Environment](https://github.com/kubernetes-incubator/kubespray/blob/master/docs/downloads.md#offline-environment))
- The target servers are configured to allow **IPv4 forwarding**.
- **Your ssh key must be copied** to all the servers part of your inventory.
- The **firewalls are not managed**, you'll need to implement your own rules the way you used to.