linux中两台服务器配置ssh免密登录

准备：2台机器，ip分别为：192.168.18.131 192.168.18.130
目的：通过131ssh远程访问130.无需输入密码
1、首先在131上生成**对。
#cd /root/.ssh (如果没有.ssh, 请在root目录下mkdir .ssh chmod 755 .ssh)
#ssh-****** -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): （直接回车）
Enter passphrase (empty for no passphrase): （直接回车）
Enter same passphrase again: （直接回车）
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:06:96:6b:56:0c:33:a4:24:16:8c:06:35:9b:98:8b:e7 [email protected]

2、在root/.ssh目录下生成**对 id_rsa和id_rsa.pub
其中id_rsa是私钥，id_rsa.pub是公钥。
3、将公钥直接copy到130的/root/.ssh目录下
#scp id_rsa.pub [email protected]:/root/.ssh
4、将130机器上的id_rsa.pub改名为authorized_keys
#cd /root/.ssh
#mv id_rsa.pub authorized_keys
5、**设置成功。131ssh访问130无需密码成功
#ssh 192.168.18.130
成功啦

若.ssh目录进不去，删除了再创建.ssh目录，然后chmod 755,然后将服务器的公钥authorized_keys复制到客户端目录下即可。