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fix(getting-started): increase ext4 size and verify artifacts #5420

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Sep 1, 2025
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fix(getting-started): increase ext4 size and verify artifacts #5420

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18 changes: 12 additions & 6 deletions docs/getting-started.md
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Original file line number Diff line number Diff line change
Expand Up @@ -115,23 +115,29 @@ latest_ubuntu_key=$(curl "http://spec.ccfc.min.s3.amazonaws.com/?prefix=firecrac
| sort -V | tail -1)
ubuntu_version=$(basename $latest_ubuntu_key .squashfs | grep -oE '[0-9]+\.[0-9]+')

# Download a rootfs
# Download a rootfs from Firecracker CI
wget -O ubuntu-$ubuntu_version.squashfs.upstream "https://s3.amazonaws.com/spec.ccfc.min/$latest_ubuntu_key"

# Create an ssh key for the rootfs
# The rootfs in our CI doesn't contain SSH keys to connect to the VM
# For the purpose of this demo, let's create one and patch it in the rootfs
unsquashfs ubuntu-$ubuntu_version.squashfs.upstream
ssh-keygen -f id_rsa -N ""
cp -v id_rsa.pub squashfs-root/root/.ssh/authorized_keys
mv -v id_rsa ./ubuntu-$ubuntu_version.id_rsa
# create ext4 filesystem image
sudo chown -R root:root squashfs-root
truncate -s 400M ubuntu-$ubuntu_version.ext4
truncate -s 1G ubuntu-$ubuntu_version.ext4
sudo mkfs.ext4 -d squashfs-root -F ubuntu-$ubuntu_version.ext4

# Verify everything was correctly set up and print versions
echo "Kernel: $(ls vmlinux-* | tail -1)"
echo "Rootfs: $(ls *.ext4 | tail -1)"
echo "SSH Key: $(ls *.id_rsa | tail -1)"
echo
echo "The following files were downloaded and set up:"
KERNEL=$(ls vmlinux-* | tail -1)
[ -f $KERNEL ] && echo "Kernel: $KERNEL" || echo "ERROR: Kernel $KERNEL does not exist"
ROOTFS=$(ls *.ext4 | tail -1)
e2fsck -fn $ROOTFS &>/dev/null && echo "Rootfs: $ROOTFS" || echo "ERROR: $ROOTFS is not a valid ext4 fs"
KEY_NAME=$(ls *.id_rsa | tail -1)
[ -f $KEY_NAME ] && echo "SSH Key: $KEY_NAME" || echo "ERROR: Key $KEY_NAME does not exist"
```

### Getting a Firecracker Binary
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