From a2ce49fa7c0d23f4fcd74b412095459c53a8df2f Mon Sep 17 00:00:00 2001
From: Yik Teng Hie <tenghie.yik@razer.com>
Date: Fri, 16 Jul 2021 13:14:22 +0800
Subject: [PATCH] aws pem file permission

---
 alibaba/database.md |  9 +++++++++
 aws/README.md       | 32 +++++++++++++++++++++++++++++++-
 2 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 alibaba/database.md

diff --git a/alibaba/database.md b/alibaba/database.md
new file mode 100644
index 0000000..4bf34b5
--- /dev/null
+++ b/alibaba/database.md
@@ -0,0 +1,9 @@
+# Alibaba Cloud Academy:  Database
+
+* AsparaDB Disk size max
+  * 2TB : local disc
+  * 32TB : Cloud disc (ESSD)
+* Migration : Data Transmission Service (DTS)
+* Data Lake Analysis (DLA)
+* Elastic Compute Service (ECS)
+
diff --git a/aws/README.md b/aws/README.md
index 88b0c7c..602aa99 100644
--- a/aws/README.md
+++ b/aws/README.md
@@ -123,4 +123,34 @@ $ aws ec2 describe-instances help
 
   
 
-* ss
\ No newline at end of file
+* PEM (Windows) file permission change
+
+  ```sh
+  # display file permission
+  $ icacls <<pem file path>>
+  
+  # Remove the permissions inheritance
+  $ icacls <<pem file path>> /inheritance:r /T
+  # Grant read permission to the current user
+  $ icacls <<pem file path>> /grant <<user name>>:R
+  
+  # updated permission display
+  PS C:\dev\doc\ec2> icacls .\RPD-API.pem
+  .\RPD-API.pem RAZER\tenghie.yik:(R)
+  ###
+  
+  # ssh to aws ec2 using update pem file permission
+  $ ssh -i "netyth-ec2-test.pem" ubuntu@ec2-54-169-180-189.ap-southeast-1.compute.amazonaws.com
+  ```
+
+* PEM (ubuntu) file permission change
+
+  ```sh
+  # change file permission
+  $ chmod 400 <<pem file>>
+  
+  # ssh to aws ec2
+  $ ssh -i "netyth-ec2-test.pem" ubuntu@ec2-54-169-180-189.ap-southeast-1.compute.amazonaws.com
+  ```
+
+  
\ No newline at end of file