macOS\aliyun ECS\ubuntu

Add New Ssh User

Add New Ssh User.md

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+# Add New Ssh User
+
+### Add new general user 
+
+You can add new general user by this command
+
+`adduser username`
+
+ You will see new folder with file `authorized_keys` in `/home/username/.ssh`
+
+### Granted root permission
+
+To avoid insufficient authority type
+
+`user mod -aG sudo username`
+
+### Create ssh key
+
+These operates are on your client not your server, type
+
+`ssh-keygen -t rsa`
+
+to create two ssh files. For mac user you will see new file `id_rsa` and `id_rsa.pub` under `/Users/username/.ssh`
+
+For windows user its always under `C:\Users\username\.ssh`
+
+### Trensfor ssh file
+
+create new folder `.ssh	` under `/home/username` 
+
+`mkdir .ssh`
+
+Transfer `id-rsa` to your server under `/home/username/.ssh` by `scp` (secure copy) . For example
+
+`scp \xxx\xxx\id_rsa remote_username@remote_ip:remote_file_or_folder`
+
+Then delete the original file `authorized_keys` by `rm authorized_keys` and rename your `id_rsa` file
+
+`mv id_rsa authorized_keys`
+
+### Modify permission
+
+So far you will see this information use commond `ll`
+
+`-rw------- 1 root root 416 Jan 14 11:41 authorized_keys`
+
+It means the owner is root. You have to modify file's read and write permission
+
+`chmod 700 .ssh`
+
+`chmod 600 .ssh/authorized_keys`
+
+`cd ..` under `/home` then
+
+`chmod 770 username`
+
+### Edit configuration file
+
+Back to the client under `/Users/username/.ssh`, add new file
+
+`sudo vim config`
+
+Type the following
+
+```c
+Host server
+    HostName 101.132.37.59
+    Port 22
+    User username
+    LocalForward 30572 xxx.xxx.x.x:3372
+    IdentityFile ~/.ssh/id_rsa
+```
+
+### Connect to server
+
+`ssh username@remote_ip`
+
+You will enter your username path
+
+`sudo su`
+
+Then enter the password, you will enter the root dictionary~
+
+
+