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| set -eu | |
| [ -e hello-vmlinux.bin ] || wget https://s3.amazonaws.com/spec.ccfc.min/img/hello/kernel/hello-vmlinux.bin | |
| [ -e hello-rootfs.ext4 ] || wget -O hello-rootfs.ext4 https://raw.githubusercontent.com/firecracker-microvm/firecracker-demo/ec271b1e5ffc55bd0bf0632d5260e96ed54b5c0c/xenial.rootfs.ext4 | |
| [ -e hello-id_rsa ] || wget -O hello-id_rsa https://raw.githubusercontent.com/firecracker-microvm/firecracker-demo/ec271b1e5ffc55bd0bf0632d5260e96ed54b5c0c/xenial.rootfs.id_rsa | |
| TAP_DEV="fc-88-tap0" | |
| # set up the kernel boot args | |
| MASK_LONG="255.255.255.252" | |
| MASK_SHORT="/30" | |
| FC_IP="169.254.0.21" | |
| TAP_IP="169.254.0.22" | |
| FC_MAC="02:FC:00:00:00:05" | |
| KERNEL_BOOT_ARGS="ro console=ttyS0 noapic reboot=k panic=1 pci=off nomodules random.trust_cpu=on" | |
| KERNEL_BOOT_ARGS="${KERNEL_BOOT_ARGS} ip=${FC_IP}::${TAP_IP}:${MASK_LONG}::eth0:off" | |
| ip link del "$TAP_DEV" 2> /dev/null || true | |
| ip tuntap add dev "$TAP_DEV" mode tap | |
| sysctl -w net.ipv4.conf.${TAP_DEV}.proxy_arp=1 > /dev/null | |
| sysctl -w net.ipv6.conf.${TAP_DEV}.disable_ipv6=1 > /dev/null | |
| ip addr add "${TAP_IP}${MASK_SHORT}" dev "$TAP_DEV" | |
| ip link set dev "$TAP_DEV" up | |
| cat <<EOF > vmconfig.json | |
| { | |
| "boot-source": { | |
| "kernel_image_path": "hello-vmlinux.bin", | |
| "boot_args": "$KERNEL_BOOT_ARGS" | |
| }, | |
| "drives": [ | |
| { | |
| "drive_id": "rootfs", | |
| "path_on_host": "hello-rootfs.ext4", | |
| "is_root_device": true, | |
| "is_read_only": false | |
| } | |
| ], | |
| "network-interfaces": [ | |
| { | |
| "iface_id": "eth0", | |
| "guest_mac": "$FC_MAC", | |
| "host_dev_name": "$TAP_DEV" | |
| } | |
| ], | |
| "machine-config": { | |
| "vcpu_count": 2, | |
| "mem_size_mib": 1024, | |
| "ht_enabled": false | |
| } | |
| } | |
| EOF | |
| firecracker --no-api --config-file vmconfig.json |
check out this gist for the most recently updated working version: https://gist.github.com/tiebingzhang/94a48798e508e65a7eac842a4c983c2f
Folks that are really struggling with these old examples, should take a look at my Firecracker lab..
https://github.com/alexellis/firecracker-init-lab (completely free)
And if you want to cut out a lot of the low-level Linux primitives, and work straight with a stable, production-ready API with networking, we have that in https://slicervm.com - created in 2022 spun out from our work on actuated (CI runners for GitHub/GitLab/Jenkins.. etc).
The slicer video also has a microVMs section with three of my best video explainers/webinars.
Alex
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Can someone please provide me a script which "just works" as I am trying to tinker with firecracker but I just cannot seem to do so
Thanks and have a nice day to everyone involved, this script and the blog post seems fascinating to look at!