Firewall rules for VM internet access in cloud infrastructure

Started by sbglobal, Oct 06, 2022, 09:21 AM

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sbglobalTopic starter

In this section, we will explore the components of Terraform and learn how to gradually build our own virtual infrastructure in the cloud using VMware. We will be setting up three virtual machines for different purposes: a proxy, a file storage, and a CMS.

Terraform is an Infrastructure-as-Code (IaC) tool that enables users to build and manage virtual infrastructure using code. This tool offers various benefits, including fast deployment of new tenants, instant verification of activation plans, and the ability to describe most popular cloud platforms. Additionally, it allows for managing multiple cloud providers and creating demo stands for testing and debugging software.

Now, let's take a closer look at the components of Terraform:

Providers - These modules enable the connection between resources and the API platform. With Terraform, almost any type of infrastructure can be represented as a resource, and providers allow you to create resources on specific platforms, such as Azure or VMware vCloud Director.

Resources - The description of resources allows you to manage platform components like virtual machines or networks. You can create a resource description for the vCloud Director provider yourself, allowing you to create resources from any hosting that uses vCloud Director.

Provisioners - This component lets you perform operations for the initial installation and maintenance of the operating system after the creation of virtual machines.

Input and Output variables - Input variables are used for all types of blocks, while output variables are used to save values after creating resources and can be used as input variables in other modules.

States - Finally, states help Terraform track and manage changes made to your infrastructure, ensuring consistency and reliability.

In this topic, we will be creating firewall rules that allow virtual machines to access the internet. We will also set up virtual machines using "Guest Customization", specifying network parameters and automatically generating user passwords.

To allow access to ports from the external network, we create rules using Source NAT and Destination NAT. These rules give any internet user access to ports 80 and 443 on the server, while a user with the IP address of has access to SSH ports of virtual servers.

We will also be creating a vApp container and configuring virtual machines within it. Each virtual machine will have its own set of parameters, including the type of connected network, virtual network to connect to, IP address allocation mode, and storage policy. For example, we will create a file storage VM for Nextcloud and add a new virtual disk that connects to the virtual machine.

Before importing our infrastructure, we can perform initial provisioning using the provisioner block. In this case, we will install CentOS service packs and run the CMS Bitrix installation script.

Overall, by properly configuring firewall rules and virtual machine parameters, we can ensure secure and reliable access to the internet for our virtual infrastructure in the cloud.


Terraform is a powerful infrastructure state management tool that utilizes a declarative approach and happens to be open source in nature. This system is crafted in Go language and boasts of a large and vibrant community that keeps creating and enhancing modules and providers for Terraform.

One of the most significant aspects of Terraform is its ability to connect with cloud providers via specific provider modules. In case you wish to connect to a VMware Cloud Director, you could employ a VCD provider that is readily available for download from GitHub.


Terraform is an extensively used tool that functions as a declarative language for managing cloud infrastructure under the Infrastructure as a Code paradigm. The straightforwardness with which you can pen down code in Terraform is taken up by the system, and everything is brought to the mentioned state via API calls. It offers an excellent integration experience with the three most prominent cloud providers: Google Cloud, OS, and Microsoft Azure.

This tool is highly useful as it simplifies the process of describing your infrastructure as code, be it virtual machines from different cloud providers or network resources. Furthermore, Terraform's ability to work independently of the environment means that it can handle everything ranging from local to cloud and even platform management. And suppose there is no predefined platform; in that case, you always have the option to craft your provider and use it to include the required features.


When it comes to setting up firewall rules for VM internet access in cloud infrastructure, there are several considerations to keep in mind. Here are some general steps you can follow:

1. Start by considering your specific requirements and security policies. Determine which services and protocols the VM needs to access over the internet.

2. Identify the potential threats and risks associated with internet access for your VM. It's important to understand what you want to protect against, such as unauthorized access, malware, or data breaches.

3. Create rules that allow only the necessary inbound and outbound traffic. Avoid allowing unnecessary services or ports that may introduce vulnerabilities. For example, if your VM is a web server, you may need to allow inbound traffic on port 80 (HTTP) or port 443 (HTTPS).

4. Consider implementing network segmentation. If applicable, separate your VMs into different subnets or security groups based on their purpose, sensitivity, or criticality. This can help minimize the risk of lateral movement in case of a successful compromise.

5. Regularly review and update your firewall rules. As your infrastructure evolves and new vulnerabilities are discovered, it is essential to stay up-to-date and make necessary adjustments to your firewall rules.

6. Utilize logging and monitoring tools to track network traffic. This can help identify any suspicious activity or potential breaches, enabling you to respond quickly and effectively.

specifics of firewall configuration may vary depending on the cloud platform or virtualization technology you are using, so it's always a good practice to consult the documentation or seek assistance from your cloud provider.


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