diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2f24d37
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+# Debian VM auto setup
+
+## Methods
+
+- Preseed
+- Cloud-init
+- Virt-customize
+
+## Tips
+
+### Connect to guest machine via SSH
+
+```
+ssh -v -p 2222 root@localhost -i ./sandbox -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no
+```
diff --git a/virt-customize_method/guest_bootstrap.sh b/virt-customize_method/guest_bootstrap.sh
new file mode 100644
index 0000000..65d28a4
--- /dev/null
+++ b/virt-customize_method/guest_bootstrap.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/sh
+
+set -x
+
+chown root:root /root/.ssh/root
+netplan apply
+ssh-keygen -A
+systemctl restart sshd
+
+date --iso-8601=s > /root/init_date.txt
diff --git a/virt-customize_method/init.sh b/virt-customize_method/init.sh
index bca7b2d..a025b81 100755
--- a/virt-customize_method/init.sh
+++ b/virt-customize_method/init.sh
@@ -10,6 +10,5 @@ virt-customize \
         --hostname "sandbox05" \
         --firstboot-install "procps,psmisc,vim,net-tools,curl,dnsutils,file,tmux" \
         --copy-in "$base/netplan:/etc" \
-        --copy-in "$base/.ssh:/root" \
-        --firstboot-command 'netplan apply && ssh-keygen -A && systemctl restart sshd'
+        --firstboot "../guest_bootstrap.sh"
 
diff --git a/virt-customize_method/run.sh b/virt-customize_method/run.sh
index 5f66a94..2836bd6 100755
--- a/virt-customize_method/run.sh
+++ b/virt-customize_method/run.sh
@@ -1,9 +1,9 @@
 cd vm
 qemu-system-x86_64                                            \
     -net nic                                                    \
-    -net user                                                   \
     -machine accel=kvm                                          \
     -cpu host                                                   \
     -m 512                                                      \
     -nographic                                                  \
-    -hda ./debian-12-generic-amd64.qcow2
+    -hda ./debian-12-generic-amd64.qcow2                        \
+    -net user,hostfwd=tcp::2222-:22