Troubleshoot SSH logins in Linux warning:permanently added (RSA) to the list of known hosts

Telnet ==>

[email protected]. ssh]# SSH 192.168.9.10
warning:permanently added ' 192.168.9.10 ' (RSA) to the list of known hosts.
Last Login:fri Sep 15:37:49 from 192.168.9.11

Reported Warning:permanently added (RSA) to the list of known hosts error

because: when SSH is executed , the known_hosts file is not generated under the ~/.ssh of this machine .

Solution:
# Vi/etc/ssh/ssh_config// Note is the client settings file
The last two lines are
stricthostkeychecking No #登录时是否询问
Userknownhostsfile/dev/null #表示隐藏known_hosts文件

The two lines are explained as follows:

Stricthostkeychecking

IF This flag was set to "Yes", SSH (1) would never automatically add host keys to the
~/.ssh/known_hosts file, and refuses to connect to the hosts whose host key has changed. The default is "ask".

Userknownhostsfile
Specifies a file to use for the user host key database instead of ~/.ssh/known_hosts.
Comment out these two lines and save the file
Execute SSH 192.168.9.10 again
Prompt appears

[email protected]. ssh]$ SSH 192.168.9.10
The authenticity of host ' 192.168.9.10 (192.168.9.10) ' can ' t be established.
RSA key fingerprint is 50:e9:44:87:86:c3:0f:85:ab:41:5e:33:1e:5b:6a:c1.
Is you sure want to continue connecting (yes/no)? Yes
warning:permanently added ' 192.168.9.10 ' (RSA) to the list of known hosts.
Last Login:fri Sep 15:27:34 from 192.168.9.11

After you enter Yes, you can see that the known_hosts file was generated in the/ROOT/.SSH directory:

[Email protected]]# ls
Id_rsa id_rsa.pub known_hosts

Troubleshoot SSH logins in Linux warning:permanently added (RSA) to the list of known hosts