[RHCSA] ssh를 사용하여 원격 시스템에 액세스

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Key 를 이용한 SSH 무인증 접속은 별도의 페이지에서 다루도록 하고

금번 장은, SSH 명령어를 이용한 간단한 원격 접근방법입니다.

1) SSH Account@IP 를 이용한 접속

- root 가 sshd config 에서 Permit 허용이 되어있지 않다면 일반계정 필요.

[root@NAT ~]$ ssh root@192.168.0.3 root@192.168.0.3's password: Last login: Wed Apr 17 09:48:36 2019 from 192.168.0.115 ////////////////////////////////////////////////////////////////////////////// RHCSA Exam Test Private Server #01 IP : 192.168.0.3 SUBNET : 255.255.255.0 GATEWAY : 192.168.0.2 SNAT IP : 210.90.167.135 : 8822 GUI Graphics Server yum install xorg* gnome* startx or init 5. ////////////////////////////////////////////////////////////////////////////// [root@192.168.0.3]$

2) /etc/hosts 에 Hostname 매칭이 되어있다면 hostname 으로도 접근 가능.

root@NAT:~# cat /etc/hosts

192.168.0.3 TEST1

root@NAT:~# ssh root@TEST1

The authenticity of host 'test1 (192.168.0.3)' can't be established.

ECDSA key fingerprint is SHA256:atlcg+nHLC2TVL3vDZhq9RvYEMI14NwjcHzTuLWMF9s.

ECDSA key fingerprint is MD5:71:a0:95:6a:1f:c3:f5:7f:87:63:64:ef:4c:e0:c9:f9.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added 'test1' (ECDSA) to the list of known hosts.

root@test1's password:

Last login: Wed Apr 17 09:50:10 2019 from gateway

3) -p 옵션을 사용하여 SSH Port 가 다른 경우 접근 가능.

root@Web1:~# ssh -p 8822 root@210.90.167.135

root@210.90.167.135's password:

Last failed login: Wed Apr 17 10:00:02 KST 2019 from 210.90.167.135 on ssh:notty

There was 1 failed login attempt since the last successful login.

Last login: Wed Apr 17 09:55:08 2019 from gateway

//////////////////////////////////////////////////////////////////////////////

RHCSA Exam Test Private Server #01

IP : 192.168.0.3

SUBNET : 255.255.255.0

GATEWAY : 192.168.0.2