ssh-keygen ssh-copy-id 无密码登陆
进行android开发经常需要登录远程ubuntu server服务器进行编译查看代码等，每次都需要输入密码，很烦人。
使用 ssh-keygen和ssh-copy-id配置一下就可以无需输入密码直接登录服务器了。
ssh-keygen 创建公钥和密钥。
ssh-copy-id 把本地主机的公钥复制到远程主机的authorized_keys文件上。
ssh-copy-id 也会给远程主机的用户主目录（home）和~/.ssh, 和~/.ssh/authorized_keys设置合适的权限 。
user@machine:~$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/user/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/user/.ssh/id_rsa. Your public key has been saved in /home/user/.ssh/id_rsa.pub. The key fingerprint is: 43:c6:7d:c4:9c:85:bd:8f:f0:5a:b7:8b:37:e6:e9:12 user@machine The key's randomart image is: +--[ RSA 2048]----+ | o.=. | | . . .= . | | + . . . | | o .. . | | S o o | | . E+ o| | o...| | ...=.| | .*=o| +-----------------+ user@machine:~$ user@machine:~$ ls -l .ssh/ total 12 -rw------- 1 user user 1679 Sep 4 16:34 id_rsa -rw-r--r-- 1 user user 393 Sep 4 16:34 id_rsa.pub -rw-r--r-- 1 user user 222 Sep 3 13:03 known_hosts user@machine:~$ ssh-copy-id -i .ssh/id_rsa.pub [email protected] [email protected]'s password: Now try logging into the machine, with "ssh '[email protected]'", and check in: ~/.ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting. user@machine:~$ ssh [email protected]
如果有端口号的话：
ssh-copy-id -i ~/.ssh/id_rsa.pub -p 20022 [email protected]