Linux SSH security settings, and password-free login

First of all, about Linux remote login, a lot of students know, but also basic use of tools to connect. This is only about the Xshell configuration method.

As we all know, Xshell provides two kinds of authentication methods: Password Authentication, key authentication

Password most commonly used, today write a Xshell Set key authentication method login

The basic idea is to generate the key---> Configure the key into the server ~/.ssh/authorized_key file---> Configure the SSH client

First step: Generate a key

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Select RSA encryption algorithm with a key length of 2048

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Choose Next to generate the key

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After the next step to enter the key name, the recommended region-application-ip such as Shanghai-www-210 (want not to enter the password, you can not enter the password, the key name here must first change, save the file do not change the name)

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Click Next to generate the key, which can be copied and then saved, or can be directly saved to a file, (if the previous step of the private key set the password, please remember, you need to enter the password, if you want to direct file import does not enter password login) direct point to complete.

Step two: Upload and configure

Upload the key file to/root/.ssh/

Cat Sh_www_210.pub >> Authorized_keys

The configuration takes effect.

Linux SSH security settings, and password-free login