Diwaker
Diwaker

Reputation: 111

Do Google Compute instances have a stable public DNS name?

This is a question in two parts:

Upvotes: 11

Views: 3282

Answers (2)

poolie
poolie

Reputation: 9526

GCE instances don't currently have a public DNS name for their external IP address. But there is now a gcloud compute config-ssh (docs) command that's a pretty good substitute.

This will insert Host blocks into your ~/.ssh/config file that contain the IP address and configuration for the host key.

Although this only helps with SSH (and SSH-based applications like Mosh and git+ssh), it does have a few advantages over DNS:

  • There is no caching/propagation delay as you might have with DNS

  • It pre-populates the right host key, and the host key is checked the right way even if the ephemeral IP address changes.

Example:

$ gcloud compute config-ssh
...
$ ssh myhost.us-west1-b.surly-koala-232

Upvotes: 0

Feczo
Feczo

Reputation: 596

reverse lookup is okay to do, for IP address you would probably prefer using gcutil https://developers.google.com/compute/docs/gcutil/tips

EXTERNAL_IP=$(gcutil getinstance --format=csv --zone=[your_zone] [your_instance] | grep external-ip | cut -d "," -f 2)

Upvotes: 1

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