For example let's say I have service A and B in GCP. Imagine that we are sending data from a VM in GCP to CloudStorage.
A sends B 10GB of traffic using the public API. In GCP would this this result in the data exiting the GCP network and then coming back in or would the entire exchange of data stay local to the GCP network?
Google VPC provides private communication between compute resources you create, and you can also enable private communication to Google managed services like Google Cloud Storage, Spanner, big data and analytics, and Machine Learning
For more details see here - https://cloud.google.com/compute/docs/private-google-access/private-google-access
The traffic is all internal and private though the API is resolved to a public destination IP address. Network address translation is in Google's infrastructure and is transparent to the user.
Related
We have a VPC which has VMs with private IP addresses only. There is no Cloud NAT attached to this VPC, so we should not be able to reach out public IPs.
Despite of the aboves, we experienced that we were able to curl the following public IP address from an internal VM.
64.233.166.153
The subnet of the VM has Private Google Access enabled and there is a default route to the default internet gateway, no other route entry matches for this IP. But there is no Cloud NAT.
My questions:
How is it possible to reach public IPs without NAT at all?
Are there other reachable public IPs? (without Cloud NAT)
What are these IPs used for?
Looks like the IP address belongs to a GCP resource/API.
As per GCP documentation[1], when PGA(Private Google Access) is enabled GCP VM instances without external IP can connect to the set of external IP addresses used by Google APIs and services by enabling Private Google Access on the subnet used by the VM's network interface.
This could be the potential reason why your VM was able to speak with the Public IP.
[1] https://cloud.google.com/vpc/docs/configure-private-google-access
Answer provided by #dp nulletla is right.
#Robert - For your use case that you mentioned in the comments - to reach BQ API from GCE with private IP without leaving google backbone network, I believe VPC Private Service Connect (PSC) for Google APIs is the right solution approach for you.
By default, if you have an application that uses a Google service, such as Cloud Storage, your application connects to the default DNS name for that service, such as storage.googleapis.com. Even though the IP addresses for the default DNS names are publicly routable, traffic sent from Google Cloud resources remains within Google's network.
With Private Service Connect, you can create private endpoints using global internal IP addresses within your VPC network. You can assign DNS names to these internal IP addresses with meaningful names like storage-vialink1.p.googleapis.com and bigtable-adsteam.p.googleapis.com. These names and IP addresses are internal to your VPC network and any on-premises networks that are connected to it using Cloud VPN tunnels or VLAN attachments. You can control which traffic goes to which endpoint, and can demonstrate that traffic stays within Google Cloud.
Basically when you create PSC endpoint,you assign private IP address to this endpoint. You reach respective google API e.g. Big Query, you always connect via PSC endpoint IP. This way you can control egress traffic in your VPC firewall rule with deny all and allow only PSC endpoint IP.
Additionally you can go 1 step further and try to restrict traffic/data going to BQ APIs from your GCE/VPC on more granular level with the use of VPC Service Control. By setting the VPC SC perimeter you can define/enforce with more restrictive policies to avoid any sort of data exfiltration.
Thanks
BR
Omkar
The use case is the following:
a Compute Engine instance with a private IP only ( no external IP)
The project has policies to not create external IPs
The goal is to be able to send HTTP requests to the Private Compute Engine Instance from Cloud Build
What are the best practices in Networking to ensure that communication?
Thank you
For now, you can't plug Cloud Build in your VPC and thus connect private resources from there.
A new feature is coming and named Worker Pool. The principle is to provision Compute Engine instances in your project, and thus in your VPC to run Cloud Build pipeline. Because the pipeline will run in your VM in your VPC, you will be able to reach the private IPs of your VPC.
Have you explored Private Google Access? It allows resources that do not have external IP to access Google's APIs and Services. Private Google Access is enabled on a subnet by subnet basis.
https://cloud.google.com/vpc/docs/private-access-options
Can someone let me know if its possible to connect or PING a Databricks Cluster via its public ip address?
For example I have issued the command ping --all-ip-addresses and I get the ip address 10.172.226.115.
I would like to be able to PING that ip address(10.172.226.115) from my on-premise PC (or connect to the cluster with an application using the ip address?
Can someone let me know if that is possible?
That public IP is not guaranteed to be your cluster; unless somehow you've installed Databricks into your own cloud provider account, where you fully control the network routes, it would be connecting to Databricks managed infrastructure where the public ip would likely be an API gateway or router that serves traffic for more than one account
Note: just because you can ping Google DNS with outbound traffic doesn't mean inbound traffic from the internet is even allowed through the firewall
connect to the cluster with an application
I'd suggest using other Databricks support channels (i.e their community forum) to see if that's even possible, but I thought you're just supposed to upload and run code within their ecosystem. At least, for the community plans
Specifically, they have a REST API to submit a remote job from your local system, but if you want to be able to send data back to your local machine, I think you'd have to write and download from DBFS or other cloud filesystem
The use case is the following:
Private network for the GCP project
VPN on the local computer that seems to be blocking SSH connections
A VM that has a webapp to be accessed but we don't want to expose the IP to the public network
What are the best practices to keep it private and to access it eg. with OAuth authentication?
What are the steps to make and to follow?
Appreciate your help with this.
There are several methods in Google Cloud. The second method is the recommended method based upon the requirements in your question.
If the users have defined public IP addresses, use Google Cloud VPC firewall rules to only allow access from approved IP addresses.
Do not assign a static public IP address to the instance. Add an HTTP(S) Load Balancer and enable IAP. Add each user's identity to IAP for identity-based access control.
Additional methods suitable for developers:
My favorite is to use WireGuard (VPN) and use peer-based access control.
I have an web app deployed in Azure App Service which uploads file to a blob container. Both App service and blob are in same resource group and region. After uploading a file successfully when I check the diagnostic logs of storage container I see a different IP address. This IP address does not belong to the list of outbound IPs mentioned in the App Service.
Why is it like that? Where does this IP come from?
Update:
The IP address is shown as private IP address if I search for it.
Regards
Binil
Generally, when web app makes an outbound call to the internet, it uses a set of predefined IP addresses. A storage account could have public or private endpoint to accept the request.
First, you could ensure that if the specific private IP you mentioned is the client request IP from app service to the storage account.
In this case, one of the possible reasons is that you have integrated your app with an Azure virtual network and enabled the integrated vnet service endpoint for Microsoft.Storage. This allow web app access an Azure storage account from a virtual network. See how Azure select a route for more details.
Edit
From this document,
Services deployed in the same region as the storage account use
private Azure IP addresses for communication. Thus, you cannot
restrict access to specific Azure services based on their public
outbound IP address range.
thus, it's properly using a private IP address from apps service to your Azure storage account in the same region over the Azure backbone network. To validate it, you can use a storage account in a different region than the app service.