diff --git a/ubuntu/README.md b/ubuntu/README.md
index 8ffbb9b..8ad1ace 100644
--- a/ubuntu/README.md
+++ b/ubuntu/README.md
@@ -79,3 +79,16 @@ $ sudo apt-get remove nodejs
 $ sudo apt autoremove
 ```
 
+* ssh id
+
+```shell
+$ ssh-keygen
+
+// copy ssh public key to host .ssh/authorized_keys to allow passwordless ssh
+$ ssh-copy-id -i abc@host
+
+// alternatively, copy local .ssh/rsa_id.pub content into target server authorized_keys
+
+
+```
+