is the username that can be used to connect to the bastion host. is the port number we want to connect to on the remote RDS instance. This can be found in the RDS console but will be along the lines of. For connection to MySQL, I set this to 3306 It makes sense to set this the same as the remote port if possible, but this can be set to any free port. is the source port on the local machine that we can use for connecting to from local applications. To create a ssh tunnel, we execute the ssh command as follows:Įnter fullscreen mode Exit fullscreen mode For more information about ssh tunnelling, check out this article. In our case, we are routing traffic from our local machine to a RDS instance via a Bastion host. For Windows users, it is available from within Powershell.Īn ssh tunnel is basically a way of routing network traffic from one place to another via a ssh host. If you're a Linux/Mac user, this will most likely already be installed. Once we've set up the networking and got an EC2 instance that can be connected via ssh from a local machine, we need to set up a ssh tunnel from our local machine through to the RDS database via the bastion host. The security group for the RDS instance should be configured to allow traffic from within the VPC which enables access from the Bastion host. The only access required from the global internet is via port 22 (ssh port). Note that it is not necessary to allow network traffic into the bastion host on the database port (3306). If the bastion server and the RDS database are not in the same VPC, then this technique will not work.įor the security groups, the Bastion server should be configured to only allow ssh traffic from a known host(s) which is your local network. We need to ensure that the EC2 instance is in the same VPC as the RDS database otherwise they will not be able to connect to each other. In terms of AWS, to create a Bastion Server, we need to create a EC2 instance (in my case, I created a t2.micro instance). When using a Bastion server, the network topology looks something like: Check out this blog post for more details on how to controll network access using a bastion server. I'm not going to go into details on how to harden a bastion server, I'm concentrating on how to access MySQL through the server. What this means, in terms of connecting to a MySQL RDS instance, is that MySQL is not installed on the Bastion server, rather we use the Bastion server as a “jump” point to allow us to get to the real database server. The computer generally hosts a single application or process In this article, I’m going to show how to use a Bastion host which does not need us to expose the database access port (port 3306 in the case of MySQL) to the internet.Ī special-purpose computer on a network specifically designed and configured to withstand attacks. This works but does have security implications in that potentially the entire internet can start pinging your RDS server. In my previous article, I showed how to connect to an Amazon RDS host by changing the security group and allowing direct access to port 3306.
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