- Make sure you have a secure SSH login password for all accounts. Do not use anything that would be obvious or can be easily guessed.
- You can change your SSH password by typing in the following command: passwd
- Protect your SSH from brute force attempts with Fail2Ban using this guide.
- Change the default port of your SSH service. Instead of using the common port 22, set it to a different port via the config file for your SSH service (this varies between Linux distributions).
- With CentOS, you can change the SSH port in the /etc/ssh/sshd_config file. Just uncomment the line for the port and set it to a value you want. Then restart the SSHd service with this command: /etc/init.d/sshd restart
- Disable any unnecessary services on your server after a fresh install. For example, some distributions of Linux will have the "httpd" (web server) service installed and running by default - you will want to disable that if you do not intend to use it. Please refer to your distro's manuals/guides on how to shut off services/processes.
- Always try to run services as a non-root user if possible.
- You can create non root users with the useradd username command and set their password with the passwd username command.
- Whitelist SSH access. You can use your hosts.allow and hosts.deny files on your server (both usually in the /etc folder) to allow access to SSH on authorized IPs only. You would want to have the "sshd: ALL" line in the hosts.deny file and "sshd: YOURIP" in the hosts.allow file (this may vary depending on the Linux distro). This can also be done via iptables.
- Use iptables to restrict ports/IP and firewall your server against basic network attacks (this can be very complex - you will want to do your research before jumping into this).
Securing your VPS
- 45 Users Found This Useful
If for any reason you need to disable the firewalld service on your CentOS 7 VPS (such as to test...
This guide will explain the basic steps for you to create your own backup VPS (running on CentOS...
Although this guide is for Ubuntu, these same steps may apply to other operating systems/distros....
Install MySQL on your Linux Server This guide is based on a standard install of CentOS - other...
By default, email ports are blocked from outbound connections to reduce abuse and lower the...