# RHCOS on Exoscale

## Prerequisites

- Download the latest RHCOS build for qemu. (e.g: rhcos-4.6.8-x86_64-qemu.x86_64.qcow2)
  https://mirror.openshift.com/pub/openshift-v4/x86_64/dependencies/rhcos/4.6/4.6.8/rhcos-4.6.8-x86_64-qemu.x86_64.qcow2.gz
  
- Install guestfish `sudo apt install libguestfs-tools`.

## Modify the RHCOS qcow

```Bash
gunzip rhcos-4.6.8-x86_64-qemu.x86_64.qcow2.gz
```

```Bash
sudo guestfish --rw -a rhcos-4.6.8-x86_64-qemu.x86_64.qcow2
```

### Inside the guestfish shell

```Bash
><fs> run
```

```Bash
><fs> list-filesystems
/dev/sda1: ext4
/dev/sda2: vfat
/dev/sda3: unknown
```

```Bash
><fs> mount /dev/sda1 /
```

```Bash
><fs> edit /loader/entries/ostree-1-rhcos.conf
```

A default text editor is opened, inside this file replace `ignition.platform.id=qemu`
by `ignition.platform.id=exoscale`


```Bash
><fs> exit
```

Finally, you can use this Qcow2 as a [Custom Template](https://community.exoscale.com/documentation/compute/custom-templates/) on Exoscale infrastructure.

## Enjoy :rocket: