Download and install VirtualBox.
Download the CoreOS ISO
Create a new VM in VirtualBox
- For the OS, Other Linux, 64-bit should be fine
- Give the VM 1gb of memory, like your physical hardware has.
- Create a disk of whatever size you want. I made a VMDK file that could expand dynamically up to 8gb.
Mount the ISO in the VM
- Right click on the VM and click settings
- Go to the storage tab
- Click on the empty disk on the left
- Click the disk icon next to IDE Secondary on the right
- Choose the ISO
- Check the Live CD/DVD box
- Go to the network tab
- Make sure NAT is selected
- Edit the port forwarding settings and add a rule for:
Host IP: 127.0.0.1 Host Port: 22022 Guest IP: 10.0.2.15 Guest Port: 22
Start the VM. It should boot into CoreOS to a core@localhost prompt.
Run sudo fdisk -l. You should have a /dev/sda device. That's the VM's disk.
Upload your SSH public key to an HTTP server somewhere that the VM can access. Suggestion:
cd ~/.ssh python -m SimpleHTTPServer
Use curl to download your SSH public key to the box.
curl http://10.0.2.2:8000/id_rsa.pub -O
Rename the file to cloud-config.yaml.
Edit the file with vim and make it look something like:
#cloud-config ssh_authorized_keys: - ssh_rsa AAAAB3NzaC1...snip
Use coreos-install to install to the VM's disk with your keys:
sudo coreos-install -d /dev/sda -C stable -c ~/cloud-config.yaml sudo poweroff
Edit the VM settings again and remove the ISO from the machine.
Power it up again. You should end up at a login prompt.
SSH into the VM:
$ ssh -p 22022 firstname.lastname@example.org Last login: Thu Apr 23 15:50:31 2015 from 192.168.59.3 CoreOS stable (633.1.0) core@localhost ~ $