ssky-keygen + ssh-copy-id 無密碼登陸遠程LINUX主機

使用下例中ssky-keygen和ssh-copy-id，僅需通過3個步驟的簡單設定而無需輸入密碼就能登入遠程Linux主機。 ssh-keygen 建立公開金鑰和密鑰。 ssh-copy-id 把本地主機的公開金鑰複製到遠程主機的authorized_keys檔案上。ssh-copy-id 也會給遠程主機的使用者主目錄（home）和~/.ssh, 和~/.ssh/authorized_keys設定合適的許可權 。 步驟1: 用 ssh-key-gen 在本地主機上建立公開金鑰和密鑰ligh@local-host$ ssh-keygen -t  rsaEnter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key] Enter passphrase (empty for no passphrase): [Press enter key]Enter same passphrase again: [Pess enter key]Your identification has been saved in /home/jsmith/.ssh/id_rsa.Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub. The key fingerprint is: 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 ligh@local-host 步驟2: 用 ssh-copy-id 把公開金鑰複製到遠程主機上ligh@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub  root@192.168.0.3ligh@remote-host‘s password:Now try logging into the machine, with ―ssh ?remote-host‘‖, and check in: .ssh/authorized_keys to make sure we haven‘t added extra keys that you weren‘t expecting.[注: ssh-copy-id 把密鑰追加到遠程主機的 .ssh/authorized_key 上.] 步驟3: 直接登入遠程主機ligh@local-host$ ssh remote-host Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2 [注: SSH 不會詢問密碼.] ligh@remote-host$ [注: 你現在已經登入到了遠程主機上]