CentOS 7 provides,
openssh-clients packages. The
openssh package requires
openssl-libs to be installed on the system since it provides some very important cryptographic libraries.
If you order a CentOS VPS Hosting with us you will have all these packages installed on your server. If not, you will need to install them manually.
For that purpose you can use the following command:
# yum install openssh openssh-server openssh-clients openssl-libs
Once the packages are installed you are ready to connect to the server via SSH. The default configuration file for the sshd daemon is
/etc/ssh/sshd_config and most of the settings for the daemon are defined in this file. Before making any changes, it is recommended to make a copy of the original configuration file so if you experience some problem you can revert the changes back the default.
# cp /etc/ssh/sshd_config /etc/ssh/sshd_config.orig
To view and edit the configuration file you can use a text editor of your choice. We are going to use
nano because of its simplicity.
# nano /etc/ssh/sshd_config
The first thing you might like to change is the listening port number. By default, the SSH daemon listens on port 22 and for security reasons you can change the number to something else. Change the line:
You can use a port number of your choice which is not used by some other service on your CentOS VPS. Once you make the changes you can save and close the file. In order for the changes to take effect, you should restart the SSH daemon.
# systemctl restart sshd.service
To improve security even further, it is recommended to use key-based authentication. Key-based authentication will allow you to connect to your server via SSH without using the password of your system user. Instead, you will need to use SSH keys. For more information about how to log in via SSH without password using SSH keys we recommend you to read our dedicated tutorial.
The SSH protocol allows other operations like copying files between two remote hosts to be completed in an encrypted and secure way. For that reason, you can use,
scp a remote file copy program, and
sftp which is an interactive file transfer program very similar to FTP. For more information on how to use
sftp you can read the user manual which is available at http://www.openssh.com/manual.html. We will cover this topic in some of our next Linux based tutorials.
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