How to set SSH key in CentOS8
Xiaobian to share with you how to set SSH key in CentOS8, I believe most people still do not know how, so share this article for everyone's reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!
environment
Client: CentOS8 192.168.43.137
Server: CentOS8 192.168.43.139
Create SSH public and private keys
Generate a new 4096-bit SSH key pair by typing:
[root@localhost ~]# ssh-keygen -t rsa -b 4096Generating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa):Enter passphrase (empty for no passphrase):Enter same passphrase again:Your identification has been saved in /root/.ssh/id_rsa.Your public key has been saved in /root/.ssh/id_rsa.pub.The key fingerprint is:SHA256:ycOtSDK8ud2kd6EH7OxoQuc1BFb1HJ3T/kvAQJt0LrI root@localhost.localdomainThe key's randomart image is:+---[RSA 4096]----+| ... oo.o o || o .+=.+ .|| . . . +=. o || . o.oo .o .|| + .oSE. . .|| .*..= o. ..|| .oo.+ o+ . . .|| .oo== o . || .o+ooo |+----[SHA256]-----+
To verify that a new SSH key pair has been generated, use ls -l to see if the ~/.ssh directory has the file you just generated:
[root@localhost ~]# ll ~/.ssh/total 8-rw------- 1 root root 3389 May 13 08:26 id_rsa-rw-r--r-- 1 root root 752 May 13 08:26 id_rsa.pub
To copy the public key to the remote server, use the ssh-copy-id utility and enter the root password for the remote server:
[root@localhost ~]# ssh-copy-id root@192.168.43.139/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"The authenticity of host '192.168.43.139 (192.168.43.139)' can't be established.ECDSA key fingerprint is SHA256:7O1oIOooh5NZG87aC3v1Zz/vcTXkjOhQBnlkY0CD4y0.Are you sure you want to continue connecting (yes/no)? yes/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keysPassword:Number of key(s) added: 1Now try logging into the machine, with: "ssh 'root@192.168.43.139'"and check to make sure that only the key(s) you wanted were added.
You can also copy the public key using the following command:
[root@localhost .ssh]# cat ~/.ssh/id_rsa.pub |ssh root@192.168.43.139 "mkdir -p ~/.ssh && chmod 700 ~/.ssh && cat >~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys" Log in to the server using a key
Log in to the ssh server using the following command:
[root@localhost ~]# ssh 192.168.43.139Last login: Tue May 12 12:33:41 2020 from 192.168.43.137 Set SSH key in CentOS 8 Set SSH key in CentOS8 Close password authentication
Log in to the server and turn off password authentication:
[root@localhost ~]# ssh 192.168.43.139Last login: Tue May 12 12:33:41 2020 from 192.168.43.137[root@localhost ~]# vim /etc/ssh/sshd_config Search for three items and change the option to NoPasswordAuthentication noChallengeResponseAuthentication noUseAuthentication no PAM
Restart sshd service:
[root@localhost ~]# systemctl restart sshd The above is "How to set SSH key in CentOS8" All the contents of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!
