linux两台机器ssh互访问不需要密码

1. 在机器A上执行：ssh-keygen -t rsa, 生成id_rsa.pub文件(~/.ssh/id_rsa.pub)

[root@pp102 ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase): #无需密码回车就行
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
92:59:44:0f:bf:07:2a:b2:e2:c3:8c:00:ec:02:d3:38 root@pp102

2. 将机器A上的id_rsa.pub文件复制到机器B的/root/.ssh目录下
3. 将id_rsa.pub文件添加至authorized_keys文件末尾：cat id_rsa.pub >> authorized_keys
4. 注意A机器上的id_rsa文件即A机器的私钥是不能动的，必须保证是创建时的文件名，权限为600

B到A 反过来操作即可

总结：要实现访问不需要密码，需要保证：
1、家目录(~/)下的.ssh/目录下存在你的原始私钥，权限、文件名都不变
2、将你的公钥追加到对方家目录下(~/)的.ssh/目录下的authorized_keys文件