![]() " aws_instance.private-host" -> " aws_subnet.private" " aws_instance.private-host" -> " aws_security_group.allow_ssh_from_bastion_host" " aws_instance.bastion-host" -> " var.bastion-host-key_name" " aws_instance.bastion-host" -> " data.aws_ami.ubuntu" " aws_instance.bastion-host" -> " aws_subnet.public" " aws_instance.bastion-host" -> " aws_security_group.allow_ssh" " tls_private_key.generated-key-private-host" " tls_private_key.generated-key-bastion-host" " aws_security_group.allow_ssh_from_bastion_host" " aws_secretsmanager_secret_version.public-key-private-host" " aws_secretsmanager_secret_version.public-key-bastion-host" " aws_secretsmanager_secret_version.private-key-private-host" ![]() " aws_secretsmanager_secret_version.private-key-bastion-host" " aws_secretsmanager_secret.private-key" " aws_key_pair.generated_key-private-host" " aws_key_pair.generated_key-bastion-host" Here it is used to represent the project. This enables the user to better understand and troubleshoot a Terraform project. As source for this it uses the Terraform graph information which can be printed via the command “terraform graph”. The website Webgraphviz visualises the Terraform code. Ssh -i private-key-private-host.pem -p 7777 #Connect to the local port which is connected to the private host Ssh -L 7777::22 a second terminal locally #Open a local port which forwards the traffic to the private host Accessing the private host via local port forwarding #Get keys if not already done To enhance security, it is also possible to tighten the security group so that only one IP (the Bastion host) could access the private host on port 22 (SSH). With SSH port forwarding, it is possible to access the private host without storing the private key on the Bastion host. Anyone who possesses the private key within the VPC could therefore access the private host. The disadvantage of the above solution is that the Bastion host requires the private key of the private host to be stored remotely. ssh -i private-key-private-host.pem Option, more secure with local port forwarding ssh -i private-key-bastion-host.pem 400 private-key-private-host.pemĬonnect via SSH from Bastion host to private host. #Change permission on the private key fileĬopy private key (private-key-private-host.pem) of private host to Bastion host.Ĭopy key via Cyberduck and SFTP (see below).Ĭonnect via SSH to Bastion host. Terraform output private-key-private-host > private-key-private-host.pem Terraform output private-key-bastion-host > private-key-bastion-host.pem Option to connect to Bastion host #Get the two private keys and store it in a file The IP addresses printed after Terraform has successfully built all the infrastructure is needed for the next steps. Result of terraform apply Apply complete! Resources: 18 added, 0 changed, 0 destroyed. Copy and unzip the Terraform code files in a folder of your choice.(optional) Change AWS region and availability zone.Change the AWS account ID in Terraform-code/variables.tf (see below).(Optional) Install the Terraform VSC add-on.(Optional) Install an integrated development environment (IDE) such as ‘Visual Studio Code(VSC)'.Sometimes a Bastion host is also referred to as a “jump-host”. The goal is to access a private host which is not directly accessible from the public internet, but accessible via the Bastion host, so that the Bastion host can access the private host. I would like to NOT have to do this through the UI, as i am already using Terraform to deploy my entire infrastructure.This article describes the process to build a Bastion host in the AWS cloud infrastructure using Terraform code. 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. 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. 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. This security group is called bastionSG, and that works fine also. 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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