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names export lb_cert path to pem formatted file export lb_private_key path to pem formatted file create a regional ssl certificate using the gcloud compute ssl certificates create command gcloud compute ssl certificates create l7 xlb cert certificate lb_cert private key lb_private_key region us west1 use the regional ssl certificate to create a target proxy with the gcloud compute target https proxies create command gcloud compute target https proxies create l7 xlb proxy url map l7 xlb map region us west1 ssl certificates l7 xlb cert project service_project_id create the forwarding rule for custom networks you must reference the subnet in the forwarding rule for the forwarding rule s ip address use the lb frontend and backend subnet if you try to use the proxy only subnet forwarding rule creation fails for http use the gcloud compute forwarding rules create command with the correct flags gcloud compute forwarding rules create l7 xlb forwarding rule load balancing scheme external_managed network projects host_project_id global networks lb network address ip_address_name ports 80 region us west1 target http proxy l7 xlb proxy target http proxy region us west1 network tier standard project service_project_id for https create the forwarding rule with the gcloud compute forwarding rules create command with the correct flags gcloud compute forwarding rules create l7 xlb forwarding rule load balancing scheme external_managed network projects host_project_id global networks lb network address ip_address_name ports 443 region us west1 target https proxy l7 xlb proxy target https proxy region us west1 network tier standard project service_project_id test the load balancer when the load balancing service is running you can send traffic to the forwarding rule and watch the traffic be dispersed to different instances console in the google cloud console go to the load balancing page go to load balancing click the load balancer that you just created note the load balancer s ip address this ip address is referred to as lb_ip_address in the following steps in the backend section confirm that the vms are healthy the healthy column should be populated indicating that both vms are healthy 2 2 if you see otherwise first try reloading the page it can take a few moments for the google cloud console to indicate that the vms are healthy if the backends do not appear healthy after a few minutes review the firewall configuration and the network tag assigned to your backend vms after the google cloud console shows that the backend instances are healthy you can test your load balancer using a web browser by going to https lb_ip_address or http lb_ip_address replace lb_ip_address with the load balancer s ip address if you used a self signed certificate for testing https your browser displays a warning you must explicitly instruct your browser to accept a self signed certificate your browser should render a page with content showing the name of the instance that served the page along with its zone for example page served from lb backend example xxxx if your browser doesn t render this page review the configuration settings in this guide gcloud note the ip address that was reserved gcloud compute addresses describe ip_address_name format get address region us west1 you can test your load balancer using a web browser by going to https ip_address_name or http ip_address_name replace ip_address_name with the load balancer s ip address if you used a self signed certificate for testing https your browser displays a warning you must explicitly instruct your browser to accept a self signed certificate your browser should render a page with minimal information about the backend instance if your browser doesn t render this page review the configuration settings in this guide configure a load balancer with a cross project backend service the previous example on this page shows you how to set up a shared vpc deployment where all the load balancer components and its backends are created in the service project regional external application load balancers also let you configure shared vpc deployments where a url map in one host or service project can reference backend services and backends located across multiple service projects in shared vpc environments this is referred to as cross project service referencing you can use the steps in this section as a reference to configure any of the supported combinations listed here forwarding rule target proxy and url map in the host project and backend service in a service project forwarding rule target proxy and url map in a service project and backend service in another service project cross project service referencing can be used with instance groups serverless negs or any other supported backend types set up requirements this example configures a sample load balancer with its frontend and backend in two different service projects if you haven t already done so you must complete all of the prerequisite steps to set up shared vpc and configure the network subnets and firewall rules required for this example for instructions see the following sections at the start of this page permissions required to set up shared vpc prerequisite configuration figure 2 load balancer frontend and backend in different service projects reserve the load balancer s ip address in service project a reserve a regional static external ip address for the load balancer in service project a all the steps in this section must be performed in service project a console in the google cloud console go to the reserve a static address page go to reserve a static address for the name of the new address enter cross ref ip address for network service tier select standard for ip version select ipv4 ipv6 addresses can only be global and can only be used with global load balancers for type select regional for region select us west1 leave the attached to option set to none after you create the load balancer this ip address is attached to the load balancer s forwarding rule to reserve the ip address click reserve gcloud to reserve a static external ip address use the compute addresses create command gcloud compute addresses create ip_address_cross_ref region us west1 network tier standard project service_project_a_id replace the following ip_address_cross_ref the name that you want to call this ip address service_project_a_id the project id for service project a where the load balancer s frontend is being created create the backends and backend service in service project b all the steps in this section must be performed in service project b console create an instance template in the google cloud console go to the instance templates page go to instance templates click create instance template enter a name for the instance template cross ref backend template ensure that the boot disk is set to a debian image such as debian gnu linux 12 bookworm these instructions use commands that are only available on debian such as apt get if you need to change the boot disk click change for operating system select debian for version select one of the available debian images such as debian gnu linux 12 bookworm click select click advanced options and then click networking enter the following network tags load balanced backend for network interfaces select networks shared with me from host project host_project_id select the lb frontend and backend subnet subnet from the lb network network click management for management insert the following script into the startup script field bin bash apt get update apt get install apache2 y a2ensite default ssl a2enmod ssl vm_hostname curl h metadata flavor google http metadata google internal computemetadata v1 instance name echo page served from vm_hostname tee var www html index html systemctl restart apache2 click create create a managed instance group in the google cloud console go to the instance groups page go to instance groups click create instance group choose new managed instance group stateless for more information see stateless or stateful migs enter a name for the instance group cross ref ig backend for location select single zone for region select us west1 for zone select us west1 a for instance template select cross ref backend template specify the number of instances that you want to create in the group for this example specify the following options for autoscaling for autoscaling mode select off do not autoscale for maximum number of instances enter 2 optionally in the autoscaling section you can configure the instance group to automatically add or remove instances based on instance cpu usage click create create a regional backend service as a part of this step we also create the health check and add backends to the backend service in the google cloud console go to the backends page go to backends click create regional backend service enter a name for the backend service cross ref backend service for region select us west1 for load balancer type select regional external application load balancer external_managed set backend type to instance groups in the backends section set network to lb network click add backend and set the following fields set instance group to cross ref ig backend set port numbers to 80 set balancing mode to utilization click done in the health check section choose create a health check with the following parameters name cross ref http health check protocol http port 80 click save optional in the add permissions section enter the iam principals typically an email address of load balancer admins from other projects so that they can use this backend service for load balancers in their own projects without this permission you cannot use cross project service referencing if you don t have permission to set access control policies for backend services in this project you can still create the backend service now and an authorized user can perform this step later as described in the section grant permissions to the load balancer admin to use the backend service that section also describes how to grant access to all the backend services in this project so that you don t have to grant access every time you create a new backend service click create gcloud create a vm instance template with an http server with the gcloud compute instance templates create command gcloud compute instance templates create backend_ig_template region us west1 network projects host_project_id global networks lb network subnet projects host_project_id regions us west1 subnetworks lb frontend and backend subnet tags load balanced backend image family debian 12 image project debian cloud metadata startup script bin bash apt get update apt get install apache2 y a2ensite default ssl a2enmod ssl vm_hostname curl h metadata flavor google http metadata google internal computemetadata v1 instance name echo page served from vm_hostname tee var www html index html systemctl restart apache2 project service_project_b_id replace the following backend_ig_template the name for the instance group template service_project_b_id the project id for service project b where the load balancer s backends and the backend service are being created host_project_id the project id for the shared vpc host project create a managed instance group in the zone with the gcloud compute instance groups managed create command gcloud compute instance groups managed create backend_mig zone us west1 a size 2 template backend_ig_template project service_project_b_id replace the following backend_mig the name for the backend instance group define the http health check with the gcloud compute health checks create http command gcloud compute health checks create http http_health_check_name region us west1 use serving port project service_project_b_id replace the following http_health_check_name the name for the http health check define the backend service with the gcloud compute backend services create command gcloud compute backend services create backend_service_name load balancing scheme external_managed protocol http health checks http_health_check_name health checks region us west1 region us west1 project service_project_b_id replace the following backend_service_name the name for the backend service created in service project b add backends to the backend service with the gcloud compute backend services add backend command gcloud compute backend services add backend backend_service_name balancing mode utilization instance group backend_mig instance group zone us west1 a region us west1 project service_project_b_id create the load balancer frontend and url map in service project a all the steps in this section must be performed in service project a console select the load balancer type in the google cloud console go to the load balancing page go to load balancing click create load balancer for type of load balancer select application load balancer http https and click next for public facing or internal select public facing external and click next for global or single region deployment select best for regional workloads and click next click configure prepare the load balancer enter the name of the load balancer cross ref l7 xlb shared vpc for the region select us west1 for the network select lb network from project host_project_id if you see a proxy only subnet required in shared vpc network warning confirm that the host project administrator has created the proxy only subnet in the us west1 region in the lb network shared vpc network load balancer creation will succeed even if you don t have permission to view the proxy only subnet on this page keep the page open to continue configure the frontend for cross project service referencing to work the frontend must use the same network lb network from the shared vpc host project that was used to create the backend service for http click frontend configuration enter a name for the forwarding rule cross ref http forwarding rule set the protocol to http set the subnetwork to lb frontend and backend subnet don t select the proxy only subnet for the frontend even if it is an option in the list select the ip address that you created in reserving the load balancer s ip address called cross ref ip address set the port to 80 click done for https if you are using https between the client and the load balancer you need one or more ssl certificate resources to configure the proxy for information about how to create ssl certificate resources see ssl certificates google managed certificates aren t currently supported with regional external application load balancers click frontend configuration enter a name for the forwarding rule cross ref https forwarding rule in the protocol field select https includes http 2 set the subnetwork to lb frontend and backend subnet don t select the proxy only subnet for the frontend even if it is an option in the list select the ip address that you created in reserving the load balancer s ip address called cro...