red hat SSH without password _redhat without password-优快云博客

本文介绍如何通过生成密钥对并使用公钥认证的方式实现SSH免密码登录。具体步骤包括在客户端生成DSA密钥对、将公钥复制到服务器的.ssh目录下，并修改服务器的sshd_config文件。

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Using the below steps, you can ssh to the server from client without the entering any password.
The machine which run the ssh command is the client
The machine that the client access using ssh is the server

Run the following command on the client
- -> ssh-keygen -t dsa
File id_dsa and id_dsa.pub will be created inside $HOME/.ssh
Copy id_dsa.pub to the server's .ssh directory
- -> scp $HOME/.ssh/id_dsa.pub user@server:/home/user/.ssh
Change to /root/.ssh and create file authorized_keys containing id_dsa content
- -> cd /home/user/.ssh
- -> cat id_dsa >> authorized_keys
Change "StrictModes yes" in /etc/ssh/sshd_config to "StrictModes no"
Restart ssh server
You can try ssh to the server from the client and no password will be needed
- -> ssh user@server

Another alternative to the above steps is to use ssh-copy-id command. The steps are:

Run the following command on the client
- -> ssh-keygen -t dsa
File id_dsa and id_dsa.pub will be created inside $HOME/.ssh
Copy the id_dsa.pub to the server's .ssh directory
- -> ssh-copy-id -i ~/.ssh/id_dsa.pub user@server
Change "StrictModes yes" in /etc/ssh/sshd_config to "StrictModes no"
Restart ssh server
You can try ssh to the server from the client and no password will be needed
- -> ssh user@server

Thanks to nailer for this information