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docs: fix Firecracker version and rootfs #4928

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Nov 27, 2024
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docs: fix Firecracker version and rootfs #4928

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10 changes: 6 additions & 4 deletions docs/getting-started.md
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Expand Up @@ -100,21 +100,23 @@ kernel image with a Ubuntu 24.04 rootfs from our CI:
```bash
ARCH="$(uname -m)"

latest=$(wget "http://spec.ccfc.min.s3.amazonaws.com/?prefix=firecracker-ci/v1.10/$ARCH/vmlinux-5.10&list-type=2" -O - 2>/dev/null | grep -oP "(?<=<Key>)(firecracker-ci/v1.10/$ARCH/vmlinux-5\.10\.[0-9]{1,3})(?=</Key>)")
latest=$(wget "http://spec.ccfc.min.s3.amazonaws.com/?prefix=firecracker-ci/v1.11/$ARCH/vmlinux-5.10&list-type=2" -O - 2>/dev/null | grep -oP "(?<=<Key>)(firecracker-ci/v1.11/$ARCH/vmlinux-5\.10\.[0-9]{1,3})(?=</Key>)")

# Download a linux kernel binary
wget "https://s3.amazonaws.com/spec.ccfc.min/${latest}"

# Download a rootfs
wget -O ubuntu-24.04.squashfs.upstream "https://s3.amazonaws.com/spec.ccfc.min/firecracker-ci/v1.10/${ARCH}/ubuntu-24.04.squashfs"
wget -O ubuntu-24.04.squashfs.upstream "https://s3.amazonaws.com/spec.ccfc.min/firecracker-ci/v1.11/${ARCH}/ubuntu-24.04.squashfs"

# Create an ssh key for the rootfs
unsquashfs ubuntu-24.04.squashfs.upstream
ssh-keygen -f id_rsa -N ""
cp -v id_rsa.pub squashfs-root/root/.ssh/authorized_keys
mv -v id_rsa ./ubuntu-24.04.id_rsa
# re-squash
mksquashfs squashfs-root ubuntu-24.04.squashfs -all-root -noappend -comp zstd
# create ext4 filesystem image
sudo chown -R root:root squashfs-root
truncate -s 400M ubuntu-24.04.ext4
sudo mkfs.ext4 -d squashfs-root -F ubuntu-24.04.ext4
```

### Getting a Firecracker Binary
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