How do I find which resources use a vpc in GCP?

Question

I want to delete a GCP vpc, I get:

Failed to delete the network. Error: Some of the resources are referenced by other existing resources and cannot be deleted.

How do I determine what these other existing resources are?

BraveAdmin · Accepted Answer · 2021-03-23T17:19:10.670

4

The resources that can be using a VPC network are the following:

Subnets
Static Internal IP addresses
Firewall rules
Routes (including static and routes created automatically/dynamically)
VPC network Peering
Private Service connection
Instances

the only way is to check each category manually and make sure that are not using the VPC.

For more information regarding each kind of resource, visit this documentation [1].

Cheers!

[1] https://cloud.google.com/vpc/docs/vpc#specifications

edited Mar 23 '21 at 17:19

answered Mar 19 '21 at 11:36

BraveAdmin

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Thanks! Did you find a document stating this? – schoon Mar 22 '21 at 07:29
1

Yes, the information provided in my response is a diggest of the current documentation. I have edited it to add the link. – BraveAdmin Mar 23 '21 at 17:19

score 0 · Answer 2 · answered Mar 15 '22 at 10:01

There are a lot of resources that relate directly to a VPC NW in GCP.

Two options of listing them:

You can list them directly with the API
You can use this python script to list most of them. My guess is you'll find the resource that blocks you from deleting the NW here. The output looks like this:


--------------------------------------------
Subnetworks in Network alon-test-network:
--------------------------------------------
https://www.googleapis.com/compute/v1/projects/alon-lavian/regions/us-central1/subnetworks/alon-test-network
https://www.googleapis.com/compute/v1/projects/alon-lavian/regions/asia-east1/subnetworks/subnet-2

--------------------------------------------
Instances in VPC alon-test-network:
--------------------------------------------
instance-3, zone: us-central1-a

--------------------------------------------
FW rules in Network alon-test-network:
--------------------------------------------
alon-test-network-allow-custom
alon-test-network-allow-http
alon-test-network-allow-https
alon-test-network-allow-icmp
default-allow-ssh-alon

--------------------------------------------
Routes in Network alon-test-network:
--------------------------------------------
default-route-d957345c6aef02c8 destination range: 10.128.0.0/20
default-route-dcecf66e898091c4 destination range: 10.0.0.0/9
default-route-fa59cdb8270a46ab destination range: 0.0.0.0/0

--------------------------------------------
VPN GW in Network alon-test-network:
--------------------------------------------
alon-vpn

--------------------------------------------
Routers in Network alon-test-network:
--------------------------------------------

--------------------------------------------
Addresses in Network alon-test-network:
--------------------------------------------
alon-address ,users: ['https://www.googleapis.com/compute/v1/projects/alon-lavian/zones/us-central1-a/instances/instance-3']

How do I find which resources use a vpc in GCP?

2 Answers2