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Compute instances should not be configured to have external IP addresses.
To reduce your attack surface, Compute instances should not have public IP addresses. Instead, instances should be configured behind load balancers, to minimize the instance’s exposure to the internet.
You can connect to Linux VMs that do not have public IP addresses by using Identity-Aware Proxy for TCP forwarding. Learn more at https://cloud.google.com/compute/docs/instances/connecting-advanced#sshbetweeninstances.
For Windows VMs, see https://cloud.google.com/compute/docs/instances/connecting-to-instance.
Removing the external IP address from your Compute instance may cause some applications to stop working.
You can configure the “Define allowed external IPs for VM instances” organization policy to prevent VMs from being configured with public IP addresses. Learn more at: https://cloud.google.com/compute/docs/ip-addresses/reserve-static-external-ip-address
Instances created by GKE should be excluded because some of them have external IP addresses and cannot be changed by editing the instance settings. Instances created by GKE should be excluded. These instances have names that start with “gke-” and are labeled “goog-gke-node”.
Describe the instance properties:
gcloud compute instances describe <INSTANCE_NAME> --zone=<ZONE>
Identify the access config name that contains the external IP address. This access config appears in the following format:
networkInterfaces:
- accessConfigs:
- kind: compute#accessConfig
name: External NAT
natIP: 130.211.181.55
type: ONE_TO_ONE_NAT
Delete the access config:
gcloud compute instances delete-access-config <INSTANCE_NAME> --zone=<ZONE> --access-config-name <ACCESS_CONFIG_NAME>
In the above example, the ACCESS_CONFIG_NAME
is External NAT
. The name of your access config might be different.