Firecracker experiments

Just a few experiments with AWS Firecracker microVM. The repository at the moment consists of:

• A Centos7 rootfs that can be used to fire up a Centos7 Firecracker microVM
• A vmlinux.bin Kernel binary file

How to run a firecracker VM using the rootfs image and the kernel binary file:

• Run the firecracker binary -- firecracker --api-sock /tmp/firecracker.socket
• In a different terminal window, set the guest kernel(hello-vmlinux.bin):

  curl --unix-socket /tmp/firecracker.socket -i \
      -X PUT 'http://localhost/boot-source'   \
      -H 'Accept: application/json'           \
      -H 'Content-Type: application/json'     \
  -   d '{
          "kernel_image_path": "./hello-vmlinux.bin",
          "boot_args": "console=ttyS0 reboot=k panic=1 pci=off"
      }'
  

• Set the guest rootfs(centos7-rootfs.ext4):

  curl --unix-socket /tmp/firecracker.socket -i \
      -X PUT 'http://localhost/drives/rootfs' \
      -H 'Accept: application/json'           \
      -H 'Content-Type: application/json'     \
      -d '{
          "drive_id": "rootfs",
          "path_on_host": "./centos7-rootfs.ext4",
          "is_root_device": true,
          "is_read_only": false
      }'
  

• Start the guest machine:

  curl --unix-socket /tmp/firecracker.socket -i \
      -X PUT 'http://localhost/actions'       \
      -H  'Accept: application/json'          \
      -H  'Content-Type: application/json'    \
      -d '{
          "action_type": "InstanceStart"
       }'`
  

Going back to your first shell, you should now see a serial TTY prompting you to log into the guest machine. If you used the Centos7-rootfs.ext4 image you can log into the guest using: username: root password: toor

Run using the firectl command-line tool

• Run the following command using the firectl command line tool -- ./firectl --kernel=./hello-vmlinux.bin --root-drive=./centos7-rootfs.ext4 --kernel-opts="console=ttyS0 noapic reboot=k panic=1 pci=off nomodules rw"