What is our primary use case?
Whenever we launch an instance, it depends on the requirements of the customers. They might use a default VPC. We always recommend that customers or anyone customize the VPC. We'll want to create a VPC with subnets, routes, and an internet gateway.
We also use the AWS console, GUI, and CloudFormation to set it up. We can also trigger it from Terraform. Three methods we use.
What is most valuable?
Security groups are very useful. But their effectiveness depends on your specific requirements.
For example, we have a website using HTTP and HTTPS traffic. We configure security groups to allow those ports (80 and 443).
However, if we're configuring something like Grafana and Prometheus, the security groups will be different. Grafana might use port 3000, and Prometheus might use port 9090. These configurations depend on the client's needs.
That's the basic idea, but some applications have standard ports. For instance, Apache uses port 80 for HTTP and 443 for HTTPS. Security groups help secure these applications by controlling access.
We can also use security groups to restrict access to specific IP addresses. For example, instead of opening a port to the entire internet (0.0.0.0/0), we can define specific IP ranges that are allowed to access the instance through that port.
What needs improvement?
VPC itself is pretty good, but understanding it well is key. One of the challenges for beginners is understanding IP address ranges and subnet concepts. For example, why use a /16 CIDR block for a VPC versus a /24? It's important to understand these concepts before creating a VPC.
Once you understand the basics, you can leverage VPC features based on your architecture. For example, a three-tier architecture (web application, database, etc.) can benefit from public and private subnets. The web application can reside in a public subnet for internet access, while the database can reside in a private subnet for security, only accessible through the web application. This helps isolate resources and improve performance.
So, the first step is understanding VPC creation and then using subnets (public and private) based on your architecture. Public subnets can connect to the internet, while private subnets cannot by default. For internet access in a private subnet, you can use a NAT Gateway and route tables.
Other components include the internet gateway (for public subnet internet access), Elastic IPs (static IP addresses), and more advanced options like VPN connections, AWS PrivateLink, etc.
Once you grasp these basic concepts, you can explore the more advanced features.
For how long have I used the solution?
My career started with this Solution, so I have about four years of experience in total.
Before coding, I studied Linux because my background was in mechanical engineering. Then, my cousin recommended these channels to learn, and that's how I got into the cloud, specifically AWS. From the beginning, I've been working on integration. Now, in the last year or so, I've been using Terraform.
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What do I think about the stability of the solution?
Most stability issues come from Availability Zones. During VPC creation, if something goes wrong, it's usually related to zones or subnets. We can check these and troubleshoot them.
For example, if an Availability Zone has an issue, it might not reflect properly in the admin console. We'd troubleshoot and fix the issue.
What do I think about the scalability of the solution?
Scaling an Amazon VPC itself isn't really possible. You can't increase the VPC's capacity. But we can scale the resources within the VPC.
For example, I have a website using an Application Load Balancer. End users hit the website, and to handle the traffic, I use the Load Balancer to distribute the requests. But what if the request volume keeps increasing?
That's where Auto Scaling Groups (ASG) come in. They offer two types of scaling: horizontal and vertical. Horizontal scaling, or scaling up, adds more instances to handle the increased load. Vertical scaling wouldn't apply to VPC itself, but it can be used to change instance types within an ASG for more processing power.
Here's an example of horizontal scaling: Suppose your instance CPU usage reaches 100%. An ASG with a properly configured policy will automatically scale up by launching a new instance to share the workload.
These policies are customizable within the ASG. You can define how the scaling happens based on your needs. For instance, you might want to automatically scale up based on CPU usage and scale down based on memory usage to maintain optimal resource utilization.
There are many different policies you can configure within an ASG.
In auto-scaling policies, we can define actions based on metrics like CPU usage. For example, if CPU usage reaches 90%, the policy can automatically scale up by launching a new instance.
How are customer service and support?
The customer service and support are good. Mostly, I can resolve networking issues myself. For some advanced services like WAF (Web Application Firewall), I might need to ask support for clarification. But for most things, like troubleshooting database endpoint connectivity issues, I can handle it myself.
Which solution did I use previously and why did I switch?
VPC is the core networking component for AWS. You can't really do much without it. It's like Azure having VNets (Virtual Networks) - virtual networking is essential. You can't achieve much without those.
How was the initial setup?
The initial setup is easy. I've deployed VPCs many times. However, if there are errors and something isn't configured correctly, then troubleshooting can be a challenge.
But overall, it's pretty straightforward and easy to handle. Moreover, integrating VPC is easy. We use VPC when launching EC2 instances. We can also integrate VPC with subnets for RDS databases. Mostly, I've integrated VPC with databases and instances across three VPCs.
What about the implementation team?
The deployment time depends. If it is a basic VPC deployment, I will write the code and deploy.
If you're using the AWS console GUI and you know what you're doing with CIDR blocks and network components, you can create a VPC, subnets, routes, and an internet gateway within five minutes.
With code, it takes longer. However, using the AWS CLI is faster than code. In my experience working with US customers, they often use CloudFormation templates (CFT) to create VPCs, load balancers, etc. CFT is very secure.
What other advice do I have?
Overall, I'd rate VPC as a nine out of ten. It's a powerful tool, but understanding the fundamentals is crucial.
Here's my advice: If you're starting out, focus on understanding the fundamentals. Be strong in the basics, like CIDR ranges and classic networking concepts. With a strong foundation, you can troubleshoot issues more easily and find solutions.
Also, if you plan to use Terraform later, start by learning the GUI. Create a VPC, subnet, and internet gateway in the GUI first. This will help you understand what the Terraform code is doing. If you jump straight into writing Terraform code, it might be difficult to grasp what's happening behind the scenes. Learn the GUI first, then Terraform. That's my approach.
Disclosure: My company does not have a business relationship with this vendor other than being a customer.