Terraform aws bastion host9/18/2023 ![]() ![]() In this part we enable the aws load balancer controllerĭeploy and test a sample app (Manually and with CICD)įinally we do some testing of our cluster and CICD pipeline. This stage changes the worker nodes int he node group so this will use the secondary CIDR address range for pods running in the EKS cluster. In this stage we deploy a private node group using a launch template, a specific AMI and a customized user data to install the SSM agent.Ĭonfigure the worker nodes to use advanced networking This stage deploys the EKS control plane. This stage deploys a private ECR container registry and sets up CodeCommit, CodeBuild and CodePipeline. This stage inter-connects the Cloud9 IDE & CICD VPC with the private EKS VPC. In the next stage we create the required IAM roles and policies for EKS.Ĭonnecting the Cloud9 IDE to the EKS network Building a Secure AWS VPC with Terraform: Subnets, Internet Gateways, and More Part-I, we explored the process of provisioning a secure Virtual Private Cloud (VPC) infrastructure on AWS. In technology, a Bastion host is used to securely connect to resources on your network, typically for a single purpose. In this stage we build the necessary base networking components for out EKS Cluster, and the VPC for CICD (CodeBuild). Creating a Bastion Host for Secure Access to Your AWS Infrastructure with Terraform. In this stage we create some pre-requisite S3 buckets and dynamodDB tables that will be used to centrally hold the Terraform “state” and control locking of that state: You will perform each of these stages in turn as you progress through the workshop. The build out of our private EKS Cluster is divided into the following stages, each of which could be performed by a separate team. In this section, we take a look at how to build the private EKS cluster in distinct stages designed to reflect different responsibility and minimum privilege models that are sometimes seen in large organizations. This can be further enhanced by provisioning an EKS cluster to operate in a private VPC with no Internet ingress or egress connectivity. Amazon EKS provides secure, managed Kubernetes clusters by default. Security is a critical component of configuring and maintaining Kubernetes clusters and applications. It also acts as an extra layer of protection for your critical infrastructure from potential security threats. It grants authorized individuals remote access to private instances within her AWS Virtual Private Cloud (VPC). The following diagram pictures the end state for this workshop:īuilding a Private EKS cluster with a multi-part responsibility model. A bastion host, often called a jump box or jump server, acts as a hardened gateway. ![]() Ensure that the security groups on the bastion host allow SSH - port 22 and the source from. We will also create a VPC hosted CI/CD pipeline using CodeCommit, CodeBuild and CodePipeline. Use ssh-agent forwarding to connect to your bastion host then to other instances on the private subnet. I would like to NOT have to do this through the UI, as i am already using Terraform to deploy my entire infrastructure.In this part of the Workshop we will build a private EKS cluster using Terraform, using our Cloud9 IDE as a bastion host. So my routine now is once Terraform deploys everything, I then find the automatic generated EKS security group and add my bastionSG as an inbound rule to it through the AWS Console (UI) as shown in the image below. In this case, you remote execution block will have bastion-host IP. The reason is because my EKS cluster is a private and only allows communication from nodes in the same VPC and i need to add a security group that allows the communication from my bastion host to the cluster control plane which is where my security group bastionSG comes in. If you want complete setup in terraform, you would need to create resource for bastion-host and then you can get connect to private subnet instance via bastion host. However, initially I am unable to run kubectl from my bastion host, which is the node I use to carry out my kubernetes development on against the EKS cluster nodes. The bastion host will serve as our access point to the underlying infrastructure. The web tier will have a bastion host and NAT gateway in the public subnets. Our architecture will reside in a custom VPC. This security group is called bastionSG, and that works fine also. In this project, we will create a three-tier architecture leveraging Terraform modules to make the process easily repeatable and reusable. One of the security groups allows inbound traffic from my Home IP to the bastion host so that i can SSH onto that node. I have also added a few security groups to the in Terraform. ![]() I have a Terraform codebase which deploys a private EKS cluster, a bastion host and other AWS services. ![]()
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