CentOS 6
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Configure SSH Server - Password Authentication
2014/08/02
 
Configure SSH Server to manage a server from the remore computer. SSH uses 22/TCP.
[1] SSHd is installed even if you installed CentOS with "Minimal Install", so it's not necessarry to install new packages. Furthermore, SSHd is set auto-start setting by default, so it's possible to login without chainging ant settings. But it had better to change for security settings like follows.
[root@dlp ~]#
vi /etc/ssh/sshd_config
# line 42: uncomment and change ( prohibit root login remotely )

PermitRootLogin
no
# line 65: uncomment

PermitEmptyPasswords no
PasswordAuthentication yes
[root@dlp ~]#
/etc/rc.d/init.d/sshd restart

[2] If IPtables is running, allow SSH port. SSH uses 22/TCP.
For "-I INPUT 5" section below, Replace it to your own environment.
[root@dlp ~]#
iptables -I INPUT 5 -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
Configure SSH Client : CentOS
 
Configure SSH Client of CentOS.
[2] Install SSH Client.
[root@client ~]#
yum -y install openssh-clients
[3] Connect to the SSH server with a common user.
# ssh [username@hostname or IP address]

[root@client ~]#
ssh cent@dlp.srv.world

The authenticity of host 'dlp.srv.world (<no hostip for proxy command>)' can't be established.
ECDSA key fingerprint is xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:60:90:d8.
Are you sure you want to continue connecting (yes/no)?
yes

Warning: Permanently added 'dlp.srv.world' (ECDSA) to the list of known hosts.
cent@dlp.srv.world's password:
# password of the user

[cent@dlp ~]$
# just 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

[cent@client ~]$
ssh cent@dlp.srv.world "cat /etc/passwd"

cent@dlp.srv.world's password:
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
...
...
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
Configure SSH Client : Windows
 
Configure SSH Client of 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.
 
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