Creating an AWS VPC

This is in connection with Juju and Fan networking where an AWS user may wish to create an additional VPC (virtual private network).

Note that only older AWS accounts will actually require a new VPC in order for Juju to autoconfigure the Fan. Recent AWS accounts are furnished with a VPC which will work out-of-the-box.

The procedure covered here refers to the AWS web interface. Alternatively, the AWS API can be used.

To add a VPC:

1. Navigate to the VPC console:

   https://console.aws.amazon.com/vpc/home

2. Create a VPC by selecting Your VPCs in the left menu and pressing the Create VPC button.

   In the resulting dialog box, enter a name for the VPC (e.g. 'vpc-juju') and a /16 address space (e.g. '192.168.0.0/16').

3. Create a subnet for the VPC by selecting Subnets in the left menu and pressing the Create Subnet button.

   In the resulting dialog box, enter a name for the subnet (e.g. 'vpc-juju-subnet'), select the VPC you created earlier, an Availability Zone (optional), and an IPv4 CIDR block that resides within the initial address space (e.g. '192.168.1.0/24').

   Select the subnet's checkbox and hit Subnet Actions. There, choose Modify auto-assign IP settings and then select Enable auto-assign public IPv4 address.

4. Create a gateway for the VPC by selecting Internet Gateways in the left menu and pressing the Create Internet Gateway button.

   In the resulting dialog box, enter a name for the gateway (e.g. 'vpc-juju-igw').

   Select the gateway's checkbox and hit Attach to VPC. There, select the VPC you created earlier.

5. Create a default route for the VPC by selecting Route Tables in the left menu and selecting the route table for your VPC. The VPC name will appear in the VPC column (along with the VPC ID).

   Down below, enter the Routes tab, press the Edit button, then Add another route. Under Destination put '0.0.0.0/0' and under Target the gateway you created earlier will be pre-populated as an option, select it. Save.

The VPC is now ready for use by Juju. If you now have multiple VPCs Juju will need to refer to a VPC by its ID. Take note of it. It has the format vpc-HHHHHHHH where each 'H' represents a hexadecimal number (e.g. 'vpc-2434a45c').