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Archive for March, 2016


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OpenSSH Installations under CentOS Linux

Thursday, March 31st, 2016

OpenSSH Installations under CentOS Linux

To install the server and client type:

# yum -y install openssh-server openssh-clients

 

Start the service:

# chkconfig sshd on
# service sshd start

 

Make sure port 22 is opened:

netstat -tulpn | grep :22

 

Firewall Settings

Edit /etc/sysconfig/iptables (IPv4 firewall),

vi /etc/sysconfig/iptables

 

Add the line

-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 22 -j ACCEP

 

If you want to restict access to 192.168.1.0/24, edit it as follows:
-A RH-Firewall-1-INPUT -s 192.168.1.0/24 -m state --state NEW -p tcp --dport 22 -j ACCEPT

If your site uses IPv6, and you are editing ip6tables, use the line:
-A RH-Firewall-1-INPUT -m tcp -p tcp --dport 22 -j ACCEPT

 

Save and close the file. Restart iptables:
# service iptables restart

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OpenSSH Server Configuration

Edit /etc/ssh/sshd_config, enter:
# vi /etc/ssh/sshd_config

To disable root logins, edit or add as follows:
PermitRootLogin no

 

Restrict login to user tom and jerry only over ssh:
AllowUsers tom jerry

Change ssh port i.e. run it on a non-standard port like 1235
Port 1235

Save and close the file. Restart sshd:
# service sshd restart

Change hostname for VPS in Virtuozzo hardware node

Monday, March 7th, 2016

vzctl set VEID –hostname VEID.domain.local –save