<div id="readability-page-1" class="page"><div id="InitArticleContents"><h3 data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;\u003c1\u003e SSH 설정 변경 - Root 로그인 차단&quot;}]}]}],&quot;size&quot;:&quot;h3&quot;}">&lt;1&gt; SSH 설정 변경 - Root 로그인 차단</h3><h3 data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;\u003c1\u003e SSH 설정 변경 - Root 로그인 차단&quot;}]}],&quot;size&quot;:&quot;h3&quot;}">&lt;1&gt; SSH 설정 변경 - Root 로그인 차단</h3>OS버전별로 설정법이 달라짐1로키 리눅스 9.4<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;useradd topas&quot;}]}]}">useradd topas<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;passwd topas&quot;}]}]}">passwd topas[root@ro94 sshd_config.d]# pwd/etc/ssh/sshd_config.d<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;[root@ro94 sshd_config.d]# vi 01-permitrootlogin.conf&quot;}]}]}">[root@ro94 sshd_config.d]# vi 01-permitrootlogin.conf변경전 PermitRootLogin yes<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;변경후 PermitRootLogin no&quot;}]}]}">변경후 PermitRootLogin no<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;[root@ro94 sshd_config.d]# service sshd restart&quot;}]}]}">[root@ro94 sshd_config.d]# service sshd restartRedirecting to /bin/systemctl restart sshd.service<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;[root@ro94 sshd_config.d]# ssh -l root 127.0.0.1&quot;}]}]}">[root@ro94 sshd_config.d]# ssh -l root 127.0.0.1<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;The authenticity of host \u0027127.0.0.1 (127.0.0.1)\u0027 can\u0027t be established.&quot;}]}">The authenticity of host '127.0.0.1 (127.0.0.1)' can't be established.<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;ED25519 key fingerprint is SHA256:g9Agv8DjgD5hbhimSBPSWrrYchDRdmqklPSBiWdiJ8A.&quot;}]}">ED25519 key fingerprint is SHA256:g9Agv8DjgD5hbhimSBPSWrrYchDRdmqklPSBiWdiJ8A.This key is not known by any other names<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;Are you sure you want to continue connecting (yes/no/[fingerprint])? yes&quot;}]}">Are you sure you want to continue connecting (yes/no/[fingerprint])? yes<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;Warning: Permanently added \u0027127.0.0.1\u0027 (ED25519) to the list of known hosts.&quot;}]}">Warning: Permanently added '127.0.0.1' (ED25519) to the list of known hosts.root@127.0.0.1's password:Permission denied, please try again.root@127.0.0.1's password:<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;[root@ro94 sshd_config.d]# ssh -l topas 127.0.0.1&quot;}]}]}">[root@ro94 sshd_config.d]# ssh -l topas 127.0.0.1topasvga@127.0.0.1's password:<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;style&quot;:{&quot;color&quot;:&quot;#ec4c6a&quot;},&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;[topasvga@ro94 ~]$ su - root&quot;}]}]}">[topasvga@ro94 ~]$ su - rootPassword:다음<p data-app="{&quot;type&quot;:&quot;text&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;anchor&quot;,&quot;url&quot;:&quot;https://brunch.co.kr/@topasvga/4714&quot;,&quot;data&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;text&quot;:&quot;https://brunch.co.kr/@topasvga/4714&quot;}],&quot;target&quot;:&quot;_blank&quot;}]}"><a target="_blank" href="https://brunch.co.kr/@topasvga/4714">https://brunch.co.kr/@topasvga/4714</a></div></div>

Master Seo

<1> SSH 설정 변경 - Root 로그인 차단 <1> SSH 설정 변경 - Root 로그인 차단 OS버전별로 설정법이 달라짐 1 로키 리눅스 9.4 useradd topas passwd topas [root@ro94 sshd_config.d]# pwd /etc/ssh/sshd_config.d [root@ro94 sshd_config.

보안4. SSH설정 변경, 패스워드 복잡성

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