SSH Login using Hostname and Login without Password

每次 login server 都要打一長串帳號 + IP + port + 密碼打到有點煩. 紀錄一下偷懶的方法: (1) 免打密碼, (2) 使用 hostname 代替 IP address

Login without Password

要準備一組公鑰上傳到 server, 然後用私鑰登入.

• Generate SSH key. The key is generated under ~/.ssh/: id_rsa (private key) and id_rsa.pub (public key).

  # Create rsa key with 4096 bits
  $ ssh-keygen -t rsa -b 4096
  

• Create a folder on server to store ssh key

  $ ssh user@server.ip.addr -C "mkdir -p ~/.ssh"
  

• Upload the public key to server

  $ cat .ssh/id_rsa.pub | ssh user@server.ip.addr "cat >> .ssh/authorized_keys"
  

• Then, you do not need to enter password starting from next login.

Login using Hostname

在 .ssh/config 加入 server 的資訊, 範例

Host myserver
	HostName 192.168.1.6
	User borting
	Port 22
	PreferredAuthentications publickey
	IdentityFile ~/.ssh/id_rsa

Reference

• SSH login without password
• OpenSSH Config File Examples For Linux / Unix Users
• Using the SSH Config File