package cloudenv

import "tailscale.com/util/cloudenv"

Package cloudenv reports which known cloud environment we're running in.

Index ¶

• Constants
• type Cloud
• func Get() Cloud
• func (c Cloud) HasInternalTLD() bool
• func (c Cloud) ResolverIP() string

Constants ¶

const (
	AWS          = Cloud("aws")          // Amazon Web Services (EC2 in particular)
	Azure        = Cloud("azure")        // Microsoft Azure
	GCP          = Cloud("gcp")          // Google Cloud
	DigitalOcean = Cloud("digitalocean") // DigitalOcean
)

const AWSResolverIP = "169.254.169.253"

AWSResolverIP is the IP address of the AWS DNS server. See https://docs.aws.amazon.com/vpc/latest/userguide/vpc-dns.html

const AzureResolverIP = "168.63.129.16"

AzureResolverIP is Azure's DNS resolver IP. See https://docs.microsoft.com/en-us/azure/virtual-network/what-is-ip-address-168-63-129-16

const CommonNonRoutableMetadataIP = "169.254.169.254"

CommonNonRoutableMetadataIP is the IP address of the metadata server on Amazon EC2, Google Compute Engine, and Azure. It's not routable. (169.254.0.0/16 is a Link Local range: RFC 3927)

const GoogleMetadataAndDNSIP = "169.254.169.254"

GoogleMetadataAndDNSIP is the metadata IP used by Google Cloud. It's also the *.internal DNS server, and proxies to 8.8.8.8.

Types ¶

type Cloud ¶

type Cloud string

Cloud is a recognize cloud environment with properties that Tailscale can specialize for in places.

func Get ¶

func Get() Cloud

Get returns the current cloud, or the empty string if unknown.

func (Cloud) HasInternalTLD ¶

func (c Cloud) HasInternalTLD() bool

HasInternalTLD reports whether c is a cloud environment whose ResolverIP serves *.internal records.

func (Cloud) ResolverIP ¶

func (c Cloud) ResolverIP() string

ResolverIP returns the cloud host's recursive DNS server or the empty string if not available.

Source Files ¶

cloudenv.go