Ubuntu 19.04
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OpenSSH : Password Authentication2019/04/22
 
Configure SSH Server to manage a server from the remore computer. SSH uses 22/TCP.
[1] Password Authentication for OpenSSH Server on Ubuntu is enabled by default, so it's possible to login without changing any settings. Furthermore, root account is prohibited Password Authentication by default with [PermitRootLogin prohibit-password], so default setting is good for use. But if you prohibit root login all, change like follows.
root@dlp:~#
apt -y install openssh-server
root@dlp:~#
vi /etc/ssh/sshd_config
# line 32: uncomment and change to [no]

PermitRootLogin
no
root@dlp:~#
systemctl restart ssh

SSH Client : Ubuntu
 
Configure SSH Client for Ubuntu.
[2] Install SSH Client.
root@client:~#
apt -y install openssh-client
[3] Connect to the SSH server with a common user.
# ssh [username@hostname or IP address]

root@client:~#
ssh ubuntu@dlp.srv.world 

The authenticity of host 'dlp.srv.world (10.0.0.30)' can't be established.
ECDSA key fingerprint is SHA256:Bn/D10zqeCQS17Cm3s2Th1dsZ4zcwdtxt6fwo6KigR0.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'dlp.srv.world,10.0.0.30' (ECDSA) to the list of known hosts.
ubuntu@dlp.srv.world's password:
Welcome to Ubuntu 19.04 (GNU/Linux 5.0.0-13-generic x86_64)
.....
.....
ubuntu@dlp:~$    
# logined
[4] It's possbile to execute commands on remote Host with adding commands to ssh command.
# for example, open /etc/passwd on remote host

ubuntu@client:~$
ssh ubuntu@dlp.srv.world "cat /etc/passwd"

ubuntu@dlp.srv.world's password:
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
...
...
ubuntu:x:1000:1000:ubuntu,,,:/home/ubuntu:/bin/bash
sshd:x:108:65534::/var/run/sshd:/usr/sbin/nologin
SSH Client : Windows #1
 
Configure SSH Client for Windows.
[5]
Get a SSH Client for Windows. This example shows to use Putty like follows.
Input your server's IP address and Click [Open] button.
[6] After authentication on SSH server, it's possible to login remotely with SSH.
SSH Client : Windows #2
[7] If your Windows is Windows 10 Version 1803 or later, OpenSSH Client has been implemented as a Windows feature, so it's possible to use ssh command on PowerShell or Command Prompt without Terminal Emulator like Putty and other SSH software.
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