![]() To reduce exposure of servers within the VPC, you will create and use a bastion host. Once set up, the bastion host acts as a jump server, allowing secure connection to instances provisioned without a public IP address. The bastion host address resolves to bastion.example. A bastion host is an instance that is provisioned with a public IP address and can be accessed via SSH.The configuration examples below make a couple of assumptions: We’ll start with OpenSSH as it’s the most common and it’s probably already installed on your Linux hosts. The Bastion host is in a public subnet, so using Bastion host, we can access private EC2 instance within same VPC by SSH. We’ll show how to set up an SSH bastion with two open-source projects: OpenSSH and Remoteler. In this way, bastion host provides an additional layer of protection to the actual server from any external harmful actors on the internet. vim /.ssh/config Add the following to the configuration file. we can also provide multiple bastion hosts to make ssh connections into the remote server. ssh -J userBastionIP:Port userDestinationIP:Port As per the documentation given in the manual pages for ssh i.e. From a command prompt, open the SSH configuration file in the Vim editor. We can also specify the server ports while connecting through the bastion host. Update the SSH configuration file to allow a proxy command to run Session Manager. In fact, the best SSH bastion should allow SSH clients to do anything else, other than “jump” to their final destinations. Use this operation to connect to the bastion host using SSH. We assume you already have an SSH server you want to use as a bastion host and have a Border0 account. When doing your infrastructure planning, it’s a good idea not to re-use the SSH bastion server for any other purpose. Let’s first look at a demo I started the blog with a bold statement, saying it would only take one minute to get going with Border0 and add it to your Bastion host. You have a process in place for applying software updates and security patches in a timely manner.SSH port is moved from #22 to something else.All network ports except those needed for SSH are not accessible from the Internet, either using a network firewall / load balancer (or security groups on cloud providers like AWS) or using the machine’s built-in firewall, iptables.Before we get to SSH configuration, make sure that the regular Linux security hardening is applied: Per-host via /. ![]() In short, you can enable forwarding one of two ways: Per-connection add -A to the ssh line when connecting to the bastion host: ssh. Therefore, setting up security on this machine is absolutely critical. There’s a great article on setting up ssh agent forwarding on GitHub. An SSH bastion is a critical component of your computing environment, as it reduces the attack surface to just one machine.
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