Design your application with static subnets in multiple regions

The following tutorial describes how to design an application with one (global) private network spanning in two regions of Google Cloud. Each region has one subnet and one compute connecting to the subnet (e.g., Compute connects to Subnet, Compute_2 connects to Subnet_2). The compute in the first region (e.g., Compute) has access to the internet.

Figure 1. Multiple subnets example

Design

Step 1. Define a subnet for the network

• Drop the Subnet component on the Private network.

Figure 2. Define a subnet

Step 2. Connect a compute to the subnet

• Click on the network point (on the right side of the Compute) and connect it to the connection point of the Subnet.

Figure 3. Connect a compute to the subnet

Step 3. Define a CIDR range for the subnet

• Click on the Subnet.

• Type 10.0.0.0/24 in the cidr field.

Figure 3. Define CIDR

Note

The cidr field is mandatory for defining a subnet.

Step 4. Define a fixed ip address for the compute (optional)

• Click on the Port of the compute.

• Type 10.0.0.3 in the ip_address field. The ip_address 10.0.0.3 is within the range of the network above (10.0.0.0/24).

Figure 4. Define fixed ip address

Note

If no ip_address specified, an ip address will be auto-generated within the ip range of the subnet during the deployment.

Step 5. Define the second compute and subnet

• Drop another Subnet component on the Private network. Now we have two subnets: Subnet and Subnet_2.

• Click on the Subnet_2. Type 10.0.1.0/24 in the cidr field.

• Drop another Compute component (e.g., Compute_2) and connect it to Subnet_2.

Figure 5. Define second subnet

Step 6. Connect the first compute to the public

• Drop a Public network.

• Connect the Port of Compute to the link point (on the left side) of the Public network.

Figure 6. Connect compute to public

Deploy

1. Go to Deploy.

2. Choose the Google provider.

3. In the Configure cloud provider:

4. Choose the zone for the computes in different regions (e.g., europe-north1-a for Compute and europe-west1-c for Compute_2).

Figure 7. Choose zone europe-north1-a for Compute

In summary, we have two computes with two subnets in two different regions:

Figure 8. Two computes in two different regions europe-north1 and europe-west1

Expected result

• The VPC private network is created with two subnets (e.g., private-subnet and private-subnet-2) in two cidr ranges (10.0.0.0/24 and 10.0.1.0/24) and in two regions (e.g., europe-north1 and europe-west1), respectively.

Figure 9. Two subnets are created

• Two VMs will be created in the two separated subnets.

• Compute-0 has a fixed ip address 10.0.0.3 (as specified in step 4) and has an external IP.

Figure 10. Two computes are created

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