add support for Exoscale in providers

content/providers/exoscale/_index.md

@@ -0,0 +1,67 @@
+---
+title: "Exoscale"
+description: "Using netboot.xyz with Exoscale compute instances"
+date: 2020-03-31T02:02:22-05:00
+weight: 7
+---
+
+[Exoscale](https://www.exoscale.com) leverages netboot.xyz as part of its
+rescue system, enabling one command boot into netboot.xyz menu.
+
+### Usage
+
+As Rescue Mode is not a default operation, it requires:
+
+* a working [`exo` command-line](https://community.exoscale.com/documentation/tools/exoscale-command-line-interface/) environment
+* access to your account API key
+* access to the Exoscale portal
+
+## Booting into Rescue Mode
+
+To reboot in Rescue Mode, first start by shutting down the instance. This can be
+performed via the CLI or via the portal in the instance details:
+
+```
+    exo vm stop broken-vm
+```
+
+Then start the instance in Rescue Mode
+
+```
+    exo vm start --rescue-profile=netboot broken-vm
+```
+
+![Start instance rescue mode](/images/providers/exoscale/rescue.gif)
+
+The instance will now boot the Netboot image.
+
+## Accessing the Netboot menu
+
+To access the Netboot menu, launch the Exoscale portal and navigate to the 
+instance detailed view. Once on the detailed view, click the **OPEN CONSOLE**
+button.
+
+A new window will open and display the instance screen and the Netboot
+menu will appear:
+
+![Netboot rescue menu from console](/images/providers/exoscale/rescue-netboot.gif)
+
+Perfom the operation you require in the instance 
+and finally reboot your instance.
+
+Once rebooted the instance will exit Rescue mode and try to boot from the
+root disk.
+
+## Booting from a custom ISO image
+
+Through rescue mode, it is possible to boot an instance from an external ISO 
+as long as the latter supports virtIO storage and network drivers. 
+To do so, perform the following steps:
+
+* Tools -> Utilities
+* netboot.xyz tools -> Test Distribution ISO
+* Enter URL (e.g. http://centos.anexia.at/centos/7.7.1908/isos/x86_64/CentOS-7-x86_64-LiveGNOME-1908.iso to boot a CentOS Live CD).
+
+![Netboot_rescue_menu_from_console_iso_image](/images/providers/exoscale/rescue_iso_recovery.gif)
+
+With this method a bare metal recovery is possible for example.