diff --git a/tools/qemu_args.sh b/tools/qemu_args.sh
index a0ac609e..61220141 100755
--- a/tools/qemu_args.sh
+++ b/tools/qemu_args.sh
@@ -7,11 +7,11 @@
 # A switch "-ovmf" can be passed as an argument to enable OVMF.
 # The enrivonmental variable VSOCK can be passed as 1 to trigger vsock module.
 
-RAND_PORT_NUM1=$(shuf -i 1024-65535 -n 1)
-RAND_PORT_NUM2=$(shuf -i 1024-65535 -n 1)
-RAND_PORT_NUM3=$(shuf -i 1024-65535 -n 1)
+SSH_RAND_PORT=$(shuf -i 1024-65535 -n 1)
+NGINX_RAND_PORT=$(shuf -i 1024-65535 -n 1)
+REDIS_RAND_PORT=$(shuf -i 1024-65535 -n 1)
 
-echo "[$1] Forwarded QEMU guest port: $RAND_PORT_NUM1->22; $RAND_PORT_NUM2->8080 $RAND_PORT_NUM3->6379" 1>&2
+echo "[$1] Forwarded QEMU guest port: $SSH_RAND_PORT->22; $NGINX_RAND_PORT->8080 $REDIS_RAND_PORT->6379" 1>&2
 
 COMMON_QEMU_ARGS="\
     -cpu Icelake-Server,+x2apic \
@@ -23,7 +23,7 @@ COMMON_QEMU_ARGS="\
     -serial chardev:mux \
     -monitor chardev:mux \
     -chardev stdio,id=mux,mux=on,signal=off,logfile=qemu.log \
-    -netdev user,id=net01,hostfwd=tcp::$RAND_PORT_NUM1-:22,hostfwd=tcp::$RAND_PORT_NUM2-:8080,hostfwd=tcp::$RAND_PORT_NUM3-:6379 \
+    -netdev user,id=net01,hostfwd=tcp::$SSH_RAND_PORT-:22,hostfwd=tcp::$NGINX_RAND_PORT-:8080,hostfwd=tcp::$REDIS_RAND_PORT-:6379 \
     -object filter-dump,id=filter0,netdev=net01,file=virtio-net.pcap \
     -device isa-debug-exit,iobase=0xf4,iosize=0x04 \
     -drive if=none,format=raw,id=x0,file=./test/build/ext2.img \