It is an EC2 instance deployed on VPC and public subnet (with access from the internet) for the connection with EC2 instance and RDS databases on VPC and private subnet (without access from the internet) through SSH (Secure Shell) and TCP/IP communication protocols. We start to create an EC2 Bastion Host instance, then provision EC2 and RDS instances on a private subnetwork and establish a connection to these instances through Bastion Hots. We will use the virtual private cloud (VPC) and subnetworks created on the post AWS Networking from scratch to protect the infrastructure by creating private and safe environments with network topologies and access control inbound and outbound communications to EC2 or databases RDS. In this post, we are going to see how to establish the connection with EC2 instances and RDS databases that are on private subnetworks (without access from the internet) through Bastion Host or Jump Box and using OpenSSH and MySQL Workbench tools. For doing these activities on EC2 instances and RDS databases are necessary to access securely. This might involve some CloudFormation script tweaking.As systems administrators, we should keep updating the infrastructure applying security patches, installing the new versions of the operation system, and setting up applications correctly to strengthen the security of cloud technologic resources and achieve AWS Shared Responsibility Model. You shouldn't address internal resources using their Elastic IP as they're public IPs and traffic to them is charged, whereas private IP traffic isn't charged. ![]() I might start with one instance in each subnet, but I'd probably turn one off if they're reliable enough - they should be.Ī CloudFormation deployment of bastion hosts is described by Amazon here. This instance would be registered with Route53 with a public domain name so even if the instance changes you will be able to access it, and that should eliminate SSH warnings. I wouldn't have a load balancer as there's no need for that as far as I can see. I'd have a bastion host, defined either as an AMI or CloudFormation script (AMI is faster), inside an autoscaling group with min/max/target set to 1. No RPO is applicable as it's effectively a stateless proxy that can be rebuilt easily. It looks like the requirement is to provide bastion functionality at lowest reasonable cost with an RTO of say 5 minutes. What are best practices for High availability SSH instances, i.e. Again, this can be resolved by running a program (on the instance or AWS Lambda) that reattaches the EIP to an instance. When the EIP is attached to an Auto Scaling Group manually, on Availability Zone failure, the EIP will get unattached and not be reattached to a new instance.When not using Auto Scaling Groups, I have to put something in place that starts new EC2 bastion hosts if the old ones fail, e.g.I can (obvously) not attach an EIP to an Auto Scaling Group directly.The obvious other solution is to use an ElasticIP, which has - as I see it - a few drawbacks: This is not really much of a concern, I added this point only for sake of completeness. About as much as the bastion host, actually. ![]() ![]()
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