How do you create a firewall rule to allow access to a container-optimized VM and access the default Nginx page using the VM's external IP?

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To create a firewall rule that allows access to a Container-Optimized VM and access the default Nginx page using the VM's external IP in Google Cloud Platform (GCP), you need to follow a series of steps. This comprehensive explanation will guide you through the process.

1. First, ensure that you have a project set up in GCP and that you have the necessary permissions to create firewall rules. If you don't have a project, create one by following the GCP documentation.

2. Next, navigate to the GCP Console by visiting the GCP website and logging in with your credentials.

3. Once you are in the GCP Console, select the project in which you want to create the firewall rule. You can do this by clicking on the project name displayed in the top bar of the GCP Console.

4. In the left-hand side menu, click on "VPC Network" and then select "Firewall rules." This will take you to the Firewall rules page.

5. On the Firewall rules page, click on the "Create Firewall Rule" button to start creating a new firewall rule.

6. In the "Name" field, provide a descriptive name for your firewall rule. For example, you can name it "allow-nginx-access."

7. In the "Network" field, select the network where your Container-Optimized VM resides. If you are using the default network, it will be named "default." Otherwise, select the appropriate network.

8. In the "Priority" field, enter a value for the priority of the firewall rule. The priority determines the order in which the firewall rules are evaluated. Lower values have higher priority. For example, you can set the priority to 1000.

9. In the "Direction of traffic" field, select "Ingress" to allow incoming traffic.

10. In the "Action on match" field, select "Allow" to permit traffic that matches the rule.

11. In the "Targets" field, select "All instances in the network" to apply the rule to all instances in the selected network.

12. In the "Source IP ranges" field, enter the IP range from which you want to allow access. If you want to allow access from any IP, you can enter "0.0.0.0/0." Alternatively, you can specify a specific IP range or individual IP addresses.

13. In the "Protocols and ports" field, enter the necessary information to allow access to the default Nginx page. The default port for Nginx is 80, so you can enter "tcp:80" to allow TCP traffic on port 80. If you want to allow additional ports or protocols, you can specify them here as well.

14. Finally, click on the "Create" button to create the firewall rule.

Once the firewall rule is created, it will allow incoming traffic from the specified source IP range to the Container-Optimized VM using the VM's external IP. You should now be able to access the default Nginx page by entering the VM's external IP address in a web browser.

It is important to note that creating firewall rules requires careful consideration of security implications. Make sure to follow best practices and only allow access from trusted sources.

To create a firewall rule to allow access to a Container-Optimized VM and access the default Nginx page using the VM's external IP, you need to navigate to the Firewall rules page in the GCP Console, provide a descriptive name for the rule, select the appropriate network, set the priority, choose the direction of traffic as "Ingress," set the action on match to "Allow," specify the source IP ranges, and define the necessary protocols and ports. Once the rule is created, you will be able to access the default Nginx page using the VM's external IP.

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