Shulou(Shulou.com)06/02 Report--

Suppose the following scenario: to achieve password-free login of CVM A to CVM B, the main steps are as follows:

1) using "ssh-keygen-t rsa" in host A to generate the corresponding private key and public key (id_rsa and id_rsa.pub).

2) add your own private key to CVM A: ssh-add id_rsa

Note: the second step is missing in many introductions, so it is common to fail the test.

Ssh-add id_rsa

# if prompted by could not open a connection to your authentication agent

The terminal does the following:

Ssh-agent bash

Ssh-add id_rsa # enter password

3) copy the public key id_rsa.pub from host A to the .ssh directory of host B and cat id_rsa.pub > > authorized_keys.

4) change the authorized_keys in host B to only the current user has read and write permissions: chmod 600authorized_keys

In this way, host A can avoid logging in to host B.

But how to break the trust relationship between the two machines? In fact, it is very simple. It is not possible to delete the key. You can do this on host A (1) cd ~ / .ssh (2) vi known_hosts (3) delete the line about host B in known_hosts.

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