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Frequently asked questions

What is a virtual private cloud (VPC)?

A virtual private cloud (VPC) is a public cloud offering that enables an enterprise to establish its own private cloud-like computing environment on a shared public cloud infrastructure. A VPC gives an enterprise the ability to define and control a virtual network that is logically isolated from all other public cloud tenants, creating a private, security-rich place on the public cloud.

What are the advantages of a VPC?

A VPC can help you control the size of your virtual network and deploy cloud resources whenever your business needs them. It is supported by redundant resources and highly fault-tolerant availability-zone architectures. And because the VPC is a logically isolated network, your data and applications won’t share space or mix with those of the cloud provider’s other customers. And finally, a VPC helps you take advantage of savings on hardware costs and labor time.

What are the business benefits of a VPC?

A VPC provides for flexible business growth as you adapt to changes in your business needs. In a digital world, customers expect uptime of nearly 100%. The high availability of VPC environments supports this goal. VPCs enjoy high levels of security at the instance level, the subnet level, or both, reducing risk across the entire data lifecycle. And with reduced costs and fewer demands on your internal IT team, you can focus your efforts on business innovation.

How secure is a VPC?

VPCs achieve high levels of security by creating virtualized replicas of the security features that control access to the resources that are housed in traditional data centers. You can define virtual networks in logically isolated parts of the public cloud. You can control which IP addresses have access to which resources.

Access control lists (ACLs) are lists of rules that limit who can access a particular subnet in your VPC. The ACL defines the set of IP addresses or applications that are granted access to the subnet.

You can create groups of resources, which may be situated in more than one subnet, and can assign uniform-access rules to them. Security groups act like virtual firewalls, controlling the flow of traffic to your virtual servers, no matter which subnet they reside in.

Can I connect my VPC to my other IBM Cloud workloads?

Yes. You can set up access to your IBM Cloud® classic infrastructure from one VPC in each region.

Can the size of a subnet be changed after it’s created?

No. A subnet cannot be resized after it has been created.

What is the limit on the number of characters in a VPC name?

Currently, the limit is 100. If this limit is exceeded, you might receive an "internal error" message.

Can my VPC resource name begin with a number?

No. Although the name can contain numbers, it must begin with a letter.

Are there restrictions on which characters I can use in a VPC resource name?

Yes. The user interface blocks consecutive double dashes, underscores and periods from being part of a virtual server instance (VSI) name.

During creation of a packet gateway, do I need to reserve the floating IP address?

If an existing floating IP address is not specified, the API automatically creates a floating IP address along with the public gateway. Your floating IP address will appear when you query all the floating IP addresses.

What enforces the rule that there must be only one public gateway per zone for a VPC?

The VPC API service enforces this limit.

How do I obtain the cloud resource name (CRN) of a VPC?

To obtain the CRN of a VPC, click Menu > Resource list from the IBM Cloud console. Expand VPC Infrastructure to list your VPCs. Select a VPC and then click the Status entry to view its details. Use the icon to copy the CRN and paste it where needed.

How does IBM Cloud®Virtual Server for VPC work?

With IBM Cloud Virtual Server for VPC, you use the UI, CLI or API to quickly provision virtual compute capacity, also known as virtual server instances or virtual machines (VM). Your infrastructure is IBM Cloud VPC, which contains a number of storage, networking and security resources. This functions as your own virtual private cloud inside the availability and scalability of the IBM public cloud.

What are the benefits of choosing virtual servers on IBM Cloud® VPC?

IBM Cloud Virtual Server for VPC lets you provision virtual servers across an infrastructure with the security of a private cloud and the agility of a public cloud. Your workloads and applications are logically isolated from other networks, and you can quickly provision resources with maximum scale and flexibility.

What are the network differences between virtual servers on IBM Cloud VPC and other IBM Cloud Virtual Server offerings?

IBM Cloud Virtual Server on our classic infrastructure operates on native subnet and virtual LAN (VLAN) networking to communicate within a data center and single pod. IBM Cloud Virtual Server for VPC operates with an additional network orchestration layer that eliminates the pod boundary, creating increased capacity for scaling instances.

What are my deployment options on IBM Cloud Virtual Server for VPC?

You can deploy multi-tenant virtual servers based on your workload profile requirements. Or you can deploy single-tenant dedicated hosts to carve out compute capacity for specific security permissions and workload purposes.

What is a region for my IBM Cloud Virtual Server for VPC?

A region is an abstraction that is related to the geographical area in which your IBM Cloud VPC is deployed. Each region contains multiple zones, which represent independent fault domains. Your IBM Cloud VPC can span multiple zones within its assigned region.

What is a zone for my IBM Cloud Virtual Server for VPC?

A zone is an abstraction that refers to the physical IBM Cloud data center that hosts your IBM Cloud Virtual Server for VPC, your network and your storage resources, including the related cooling and power, which provides services and applications. Zones are isolated from each other to create no shared single point of failure, improved fault tolerance and reduced latency. Each zone is assigned a default address prefix, which specifies the address range in which subnets can be created. If the default address scheme does not suit your requirements, such as if you want to bring your own public Ipv4 address range, you can customize the address prefixes.

Is storage attached to my virtual server on IBM Cloud VPC?

When you provision a virtual server instance, a 100 GB IBM Cloud Block Storage volume is automatically attached as a primary boot volume. To add secondary data volumes to your virtual server instance, you can create block storage volumes.