ssh免密码登录命令行

ssh免密码登录命令行

 

1、使用 ssh-keygen -t  rsa 生成私钥和公钥

 

ssh-keygen -b 1024 -t dsa

 

Generating public/private dsa key pair. 

Enter file in which to save the key (/home/user/.ssh/id_dsa): /home/user/.ssh/id_dsa 

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_ras.pub.

  www.2cto.com  

2、密钥分发 

把私钥放在自己的机器上的~/.ssh/目录下并保证访问权限是“-rw-------”(即600)。 

再把生成的公钥放在要连接的远程主机的~/.ssh/目录下并改名为authorized_keys,并且保证文件除了属主外没有被人修改的权限。

 

命令 

cd ~/.ssh

 

ssh-copy-id user@IP 

or 

ssh-copy-id –i id_rsa.pub user@IP

 

3、登录 

ssh username@ip直接登录

 

4、运行命令 

ssh user@ip  ./test.sh

 

普通用户ssh连接linux服务器是总是提示：

ulimit: open files: cannot modify limit: Operation not permitted

 

解决办法： 

vi /etc/security/limits.conf

添加：  www.2cto.com  

 

* soft nofile 65535 

* hard nofile 65535

 

如果无法登录， 

删除/home/user/.ssh/known_hosts文件再试