How do I install and configure both ssh server and client under CentOS Linux operating systems?

You need to install the following packages (which are installed by default unless you removed it or skipped it while installing CentOS)

openssh-clients : The OpenSSH client applications
openssh-server : The OpenSSH server daemon

ssh key for VPS Public Key

 
 

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 for SSH

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 ACCEPT

If you want to restrict 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

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:
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


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