The application host has a security group rule that allows port 22 access only from the management VPC’s bastion host security group. The application host resides in a private subnet in a VPC that is peered with the management VPC. The following diagram illustrates this design: ![]() For further isolation, the bastion host generally resides in a separate VPC. The benefit of using a bastion host in this regard is that access to any of the internal hosts is isolated to one means of access: through either a single bastion host or a group. Bastion host accessĪccess to the bastion host is ideally restricted to a specific IP range, typically from your organization’s corporate network. The solution is to replace your bastion host by using Amazon EC2 Systems Manager. In this post, I demonstrate how you can reduce your system’s attack surface while also offering greater visibility into commands issued on your hosts. To access it for product updates or managing system patches, you typically log in to a bastion host and then access (or “jump to”) the application host from there. For example, your system might include an application host that is not intended to be publicly accessible. I hope this shortcut helps other Linux users often doing the same thing! This has made my life a lot easier.Bastion hosts (also called “jump servers”) are often used as a best practice for accessing privately accessible hosts within a system environment. This is a shortcut to specify a ProxyJump configuration directive. ![]() Multiple jump hops may be specified separated by comma characters. J Connect to the target host by first making a ssh connection to the jump host and then establishing a TCP forwarding to the ultimate destina‐ tion from there. Manpages for SSH(1) explain the following: That was where it was recommended for me to use the -J option, in the format of ssh -J. And like us Linux users sometimes do, I decided to ask the community what the easiest way to do this is, so I hopped on the #linux (freenode) IRC channel. This greatly reduces the surface attack area for your secure network (and servers).Ī couple of weeks ago, I was getting frustrated with what I thought was the de facto way to connect through a jumpbox. You would have access to your jumpbox, and your jumpbox would have access to your secure network. This is where the jumpbox would come into play. That’s all fine and well, but typically if you’re connecting through the public internet you wouldn’t have access to your protected server(s). When provisioning or setting up your Linux servers in your data center, your favorite cloud service provider, or under your desk it is a common practice to add your SSH public key to authorized keys on the destination server. To SSH to a server through a jumpbox, you can use ssh -J The longer version Typically, you may have what is commonly referred to as a “jumpbox”, which is accessible from a public network (sometimes this jumpbox would be in a DMZ). This is a common pattern: You have a protected server (or servers) that aren’t publicly accessible.
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