diff --git a/.gitignore b/.gitignore
index 61d565d..da017ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,4 @@ state/
 *.tgz
 *.squashfs*
 squashfs-root/
-rootfs.ext4
+rootfs*
diff --git a/rootfs.ext4 b/rootfs.ext4
deleted file mode 100644
index 131bf10..0000000
Binary files a/rootfs.ext4 and /dev/null differ
diff --git a/run.sh b/run.sh
index bd67534..2321514 100755
--- a/run.sh
+++ b/run.sh
@@ -21,12 +21,13 @@ BR_IP="172.16.0.1"
 CIDR="24"
 
 VM_ID="$(date +%s)-$$"
+VM_TAG="${VM_ID##*-}"
 VM_DIR="$STATE/vm-$VM_ID"
 mkdir -p "$VM_DIR"
 
 API_SOCK="$VM_DIR/firecracker.sock"
 LOG_FILE="$VM_DIR/firecracker.log"
-TAP_DEV="tap-fc-$VM_ID"
+TAP_DEV="tap-fc-$VM_TAG"
 
 # Allocate guest IP
 NEXT_IP_FILE="$STATE/next_ip"
@@ -132,5 +133,4 @@ log "vm started successfully"
 log "guest ip: $GUEST_IP"
 log "ssh: ssh -i \"$SSH_KEY\" root@$GUEST_IP"
 log "logs: $LOG_FILE"
-log "done"