RancherOS on KVM and ZFS

README

zfs create poolname/images/rancher
zfs set recordsize=16K poolname/images/rancher
zfs set compression=lz4 poolname/images/rancher
qemu-img create -f qcow2 -ocluster_size=16K /poolname/images/rancher/rancher.qcow2 16G

mkdir -p /images/rancher/images/pxeboot
mkdir -p /images/rancher/config/openstack/latest/

wget https://releases.rancher.com/os/latest/vmlinuz -O /images/rancher/images/pxeboot/vmlinuz
wget https://releases.rancher.com/os/latest/initrd -O /images/rancher/images/pxeboot/initrd.img

vim /images/rancher/config/openstack/latest/user_data

virt-install --name rancher --memory 8192 --vcpus 2 --cpu host --os-type linux --os-variant rhel7 \
  --network bridge=br0 --graphics none --noautoconsole --accelerate \
  --disk /images/rancher/rancher.qcow2,cache=writeback,device=disk,bus=virtio \
  --filesystem /images/rancher/config/,config-2,mode=squash \
  --location /images/rancher/ --extra-args="rancher.state.dev=LABEL=RANCHER_STATE rancher.state.autoformat=[/dev/sda,/dev/vda] console=ttyS0,115200n8 rancher.autologin=ttyS0 rancher.cloud_init.datasources=['configdrive']" \
  --boot hd
  
virsh console rancher

user_data

#cloud-config
ssh_authorized_keys:
  - ssh-ed25519 ....
rancher:
  network:
    interfaces:
      eth0:
        address: IPADDR/32
        mtu: 1500
        dhcp: false
        pre_up:
        - ip link set eth0 address MAC
        post_up:
        - route add GW dev eth0
        - route add default gw GW4
  ssh:
    port: 10022
  services:
    rancher-agent1:
      image: rancher/rancher-agent:v2.1.7
      command: --server https://host.tld --token XXXXXXXXXX --node-name YYYYYY --address xxx.xxx.xxx.xxx --etcd --controlplane --worker
      privileged: true
      restart: unless-stopped
      net: host
      volumes:
        - /var/run:/var/run
        - /etc/kubernetes:/etc/kubernetes

This is running on OVH under KVM using a fallback IP address with virtual MAC set. The host also needs a static route set on the bridge to the vm.