Create, Load, and Start a bunch of simple firecracker vms

create_vms.sh

#!/bin/bash
echo "Bash version ${BASH_VERSION}..."

FIRECRACKER_BIN=/usr/bin/firecracker
JAILER_BIN=/usr/bin/jailer

echo -n "Jailer version "
$JAILER_BIN -V

echo -n "Firecracker version "
$FIRECRACKER_BIN -V



# Create the default chroot directory
mkdir -p /srv/jailer

for i in {1100..1200}
 do
   #SUFFIX=$(cat /dev/random | LC_CTYPE=C tr -dc "a-z0-9" | head -c 5)
   SUFFIX=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w ${1:-8} | head -n 1)
   echo "Creating user firecracker_$SUFFIX"
   # Create a uid/gid/homedir for each vm
   useradd firecracker_$SUFFIX
   TMP_UID=`id -u firecracker_$SUFFIX`
   TMP_GID=`id -g firecracker_$SUFFIX`
   # Launch firecracker using jailer
   JAILER_COMMAND="$JAILER_BIN --id $SUFFIX --node 0 --exec-file $FIRECRACKER_BIN --uid $TMP_UID --gid $TMP_GID --daemonize"
   echo $JAILER_COMMAND
   eval $JAILER_COMMAND &
   sleep 1
   # Copy in the kernel and rootfs
   cp hello* /srv/jailer/firecracker/$SUFFIX/root/
   chown -R $TMP_UID:$TMP_GID /srv/jailer/firecracker/$SUFFIX/root/*
done

end_vms.sh

#!/bin/bash
echo "Bash version ${BASH_VERSION}..."

# This should work based on the swagger yaml, but doesn't work with version 0.14.0 
# I use pkill firecracker instead and then remove all the /srv/jailer stuff

for sock in `find /srv/jailer/firecracker -name "api.socket"`; do
 curl --unix-socket $sock -i \
    -X PUT 'http://localhost/actions'       \
    -H  'Accept: application/json'          \
    -H  'Content-Type: application/json'    \
    -d '{
        "action_type": "SendCtrlAltDel"
     }'
done

load_vms.sh

#!/bin/bash
echo "Bash version ${BASH_VERSION}..."

for sock in `find /srv/jailer/firecracker -name "api.socket"`; do

echo $sock

curl --unix-socket $sock -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"
    }'

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

done

start_vms.sh

#!/bin/bash
echo "Bash version ${BASH_VERSION}..."

for sock in `find /srv/jailer/firecracker -name "api.socket"`; do
 curl --unix-socket $sock -i \
    -X PUT 'http://localhost/actions'       \
    -H  'Accept: application/json'          \
    -H  'Content-Type: application/json'    \
    -d '{
        "action_type": "InstanceStart"
     }'
done