Is it possible to identify which compute instances a static external IP address is associated with? I see the following chain of connection:
address -> forwarding rule -> target proxy -> url map -> backend service -> instance groupNow I can list the instances contained in the eventual instance group. But this is a long chain to follow. Is there any idiomatic way to achieve this quickly, or will I need to script this?
Notice that gcloud can list the external IPs of an instance:
$ gcloud compute instances list
NAME ZONE MACHINE_TYPE ... EXTERNAL_IP STATUS
test asia-east1-a n1-standard-1 ... 1.1.1.1 RUNNING
...
If you run again with the --verbosity info flag, you'll see that the EXTERNAL_IP row in the column comes from (see gcloud topic formats and gcloud topic projections):
networkInterfaces[].accessConfigs[0].natIP.notnull().list():label=EXTERNAL_IPYou can get a list of all of the NAT IPs for an instance via (notice the dropped 0 for accessConfigs; this aggregates all NAT IPs:
$ gcloud compute instances list \
--format 'value(networkInterfaces[].accessConfigs[].natIP)'
[u'1.1.1.1']
[u'1.1.1.2']
...
With a specific IP in mind, you can turn that into a filter expression:
$ gcloud compute instances list \
--filter 'networkInterfaces[].accessConfigs[].natIP:1.1.1.1'
NAME ZONE MACHINE_TYPE ... EXTERNAL_IP STATUS
test asia-east1-a n1-standard-1 ... 1.1.1.1 RUNNING
...
This works for me when the instance is part of an instance group.