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es url maps overview use url maps url map size and quota units operate and maintain audit logging information health check logging information clean up a load balancer setup ai and ml application development application hosting compute data analytics and pipelines databases distributed hybrid and multicloud industry solutions migration networking observability and monitoring security storage access and resources management costs and usage management infrastructure as code sdk languages frameworks and tools home documentation networking load balancing guides send feedback set up a regional external application load balancer with hybrid connectivity stay organized with collections save and categorize content based on your preferences this page illustrates how to deploy a regional external application load balancer to load balance traffic to network endpoints that are on premises or in other public clouds and are reachable by using hybrid connectivity note for global external application load balancer instructions see setting up a global external application load balancer with hybrid connectivity for classic application load balancer instructions see setting up an classic application load balancer with hybrid connectivity after you complete these tasks you can optionally explore enabling additional services such as cloud cdn and google cloud armor and advanced traffic management features if you haven t already done so review the hybrid connectivity negs overview to understand the network requirements to set up hybrid load balancing note regional external application load balancers support both the premium and standard network service tiers this procedure demonstrates the setup with standard tier setup overview the example on this page sets up the following sample deployment external application load balancer example for hybrid connectivity click to enlarge you must configure hybrid connectivity before you attempt to set up a hybrid load balancing deployment this document does not include the hybrid connectivity setup depending on your choice of hybrid connectivity product either cloud vpn or cloud interconnect dedicated or partner use the relevant product documentation to configure this permissions to set up hybrid load balancing you must have the following permissions on google cloud permissions to establish hybrid connectivity between google cloud and your on premises environment or other cloud environments for the list of permissions needed see the relevant network connectivity product documentation permissions to create a hybrid connectivity neg and the load balancer the compute load balancer admin role roles compute loadbalanceradmin contains the permissions required to perform the tasks described in this guide on your on premises environment or other non google cloud cloud environment permissions to configure network endpoints that allow services on your on premises environment or other cloud environments to be reachable from google cloud by using an ip port combination for more information contact your environment s network administrator permissions to create firewall rules on your on premises environment or other cloud environments to allow google s health check probes to reach the endpoints additionally to complete the instructions on this page you need to create a hybrid connectivity neg a load balancer and zonal negs and their endpoints to serve as google cloud based backends for the load balancer you should be either a project owner or editor or you should have the following compute engine iam roles task required role create networks subnets and load balancer components compute network admin roles compute networkadmin add and remove firewall rules compute security admin roles compute securityadmin create instances compute instance admin roles compute instanceadmin optional use byoip addresses with bring your own ip byoip you can import your own public addresses to google cloud to use the addresses with google cloud resources for example if you import your own ipv4 addresses you can assign one to the forwarding rule when you configure your load balancer when you follow the instructions in this document to configure the load balancer provide the byoip address as the ip address for more information about using byoip see bring your own ip addresses establish hybrid connectivity your google cloud and on premises environment or other cloud environments must be connected through hybrid connectivity by using either cloud interconnect vlan attachments or cloud vpn tunnels with cloud router or router appliance vms we recommend that you use a high availability connection a cloud router enabled with global dynamic routing learns about the specific endpoint through border gateway protocol bgp and programs it into your google cloud vpc network regional dynamic routing is not supported static routes are also not supported you can use either the same network or a different vpc network within the same project to configure both hybrid networking cloud interconnect or cloud vpn or a router appliance vm and the load balancer note the following if you use different vpc networks the two networks must be connected using either vpc network peering or they must be vpc spokes on the same ncc hub if you use the same vpc network ensure that your vpc network s subnet cidr ranges don t conflict with your remote cidr ranges when ip addresses overlap subnet routes are prioritized over remote connectivity for instructions see the following documentation cloud vpn cloud interconnect important don t proceed with the instructions on this page until you set up hybrid connectivity between your environments set up your environment that is outside google cloud perform the following steps to set up your on premises environment or other cloud environment for hybrid load balancing configure network endpoints to expose on premises services to google cloud ip port configure firewall rules on your on premises environment or other cloud environment configure cloud router to advertise certain required routes to your private environment set up network endpoints after you set up hybrid connectivity you configure one or more network endpoints within your on premises environment or other cloud environments that are reachable through cloud interconnect or cloud vpn or router appliance by using an ip port combination this ip port combination is configured as one or more endpoints for the hybrid connectivity neg that is created in google cloud later on in this process if there are multiple paths to the ip endpoint routing follows the behavior described in the cloud router overview set up firewall rules the following firewall rules must be created on your on premises environment or other cloud environment create an ingress allow firewall rule in on premises or other cloud environments to allow traffic from the region s proxy only subnet to reach the endpoints allowing traffic from google s health check probe ranges isn t required for hybrid negs however if you re using a combination of hybrid and zonal negs in a single backend service you need to allow traffic from the google health check probe ranges for the zonal negs advertise routes configure cloud router to advertise the following custom ip ranges to your on premises environment or other cloud environment the range of the region s proxy only subnet set up google cloud environment for the following steps make sure you use the same vpc network called network in this procedure that was used to configure hybrid connectivity between the environments additionally make sure the region used called region in this procedure is the same as that used to create the cloud vpn tunnel or cloud interconnect vlan attachment configure the proxy only subnet this proxy only subnet is used for all regional external application load balancers in the region region console in the google cloud console go to the vpc networks page go to vpc networks go to the network that was used to configure hybrid connectivity between the environments click add subnet enter a name proxy_only_subnet_name select a region region set purpose to regional managed proxy enter an ip address range proxy_only_subnet_range click add gcloud create the proxy only subnet with the gcloud compute networks subnets create command gcloud compute networks subnets create proxy_only_subnet_name purpose regional_managed_proxy role active region region network network range proxy_only_subnet_range configure the load balancer subnet this subnet is used to create the load balancer s zonal neg backends the frontend and the internal ip address create this subnet in the network network that was used to configure hybrid connectivity between the environments cloud console in the google cloud console go to the vpc networks page go to vpc networks go to the network that was used to configure hybrid connectivity between the environments in the subnets section set the subnet creation mode to custom in the new subnet section enter the following information name lb_subnet_name region region ip address range lb_subnet_range click done click create gcloud create a subnet in the network network that was used to configure hybrid connectivity between the environments gcloud compute networks subnets create lb_subnet_name network network range lb_subnet_range region region reserve the load balancer s ip address note regional external application load balancers support both the premium and standard network service tiers this procedure demonstrates the setup with standard tier cloud console in the google cloud console go to the reserve a static address page go to reserve a static address enter a name lb_ip_address for the network service tier select standard for ip version select ipv4 for type select regional select the region to create the address in leave the attach to option for set to none after you create the load balancer this ip address will be attached to the load balancer s forwarding rule click reserve to reserve the ip address gcloud reserve a regional static external ip address as follows gcloud compute addresses create lb_ip_address region region network tier standard use the compute addresses describe command to view the result gcloud compute addresses describe lb_ip_address region region create firewall rules for zonal negs in this example you create the following firewall rules for the zonal neg backends on google cloud fw allow health check an ingress firewall rule applicable to the instances being load balanced that allows traffic from the load balancer and google cloud health check probe ranges this example uses the target tag allow health check to identify the backend vms to which it should apply allowing traffic from google s health check probe ranges isn t required for hybrid negs however if you re using a combination of hybrid and zonal negs in a single backend service you need to allow traffic from the google health check probe ranges for the zonal negs fw allow proxy only subnet an ingress firewall rule that allows connections from the proxy only subnet to reach the backends this example uses the target tag allow proxy only subnet to identify the backend vms to which it should apply console in the google cloud console go to the firewall policies page go to firewall policies click create firewall rule to create the rule to allow traffic from health check probes enter a name of fw allow health check under network select network under targets select specified target tags populate the target tags field with allow health check set source filter to ipv4 ranges set source ipv4 ranges to 35 191 0 0 16 under protocols and ports select specified protocols and ports select tcp and then enter 80 for the port number click create click create firewall rule again to create the rule to allow incoming connections from the proxy only subnet name fw allow ssh network network priority 1000 direction of traffic ingress action on match allow targets specified target tags target tags allow proxy only subnet source filter ipv4 ranges source ipv4 ranges proxy_only_subnet_range protocols and ports choose specified protocols and ports select tcp and then enter 80 for the port number click create gcloud create the fw allow health check and proxy rule to allow the google cloud health checks to reach the backend instances on tcp port 80 gcloud compute firewall rules create fw allow health check network network action allow direction ingress target tags allow health check source ranges 35 191 0 0 16 rules tcp 80 create an ingress allow firewall rule for the proxy only subnet to allow the load balancer to communicate with backend instances on tcp port 80 gcloud compute firewall rules create fw allow proxy only subnet network network action allow direction ingress target tags allow proxy only subnet source ranges proxy_only_subnet_range rules tcp 80 set up the zonal neg for google cloud based backends we recommend you configure multiple zonal negs in the same region where you configured hybrid connectivity for this example we set up a zonal neg with gce_vm_ip_port type endpoints in the region region first create the vms in the gcp_neg_zone zone then create a zonal neg in the same gcp_neg_zone and add the vms network endpoints to the neg create vms console go to the vm instances page in the google cloud console go to vm instances click create instance set the name to vm a1 for the region choose region and choose any zone this will be referred to as gcp_neg_zone in this procedure in the boot disk section ensure that debian gnu linux 12 bookworm is selected for the boot disk options click choose to change the image if necessary click advanced options and make the following changes click networking and add the following network tags allow ssh allow health check and allow proxy only subnet click edit edit under network interfaces and make the following changes then click done network network subnet lb_subnet_name click management in the startup script field copy and paste the following script contents the script contents are identical for all four vms 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 repeat the following steps to create a second vm using the following name and zone combination name vm a2 zone gcp_neg_zone gcloud create the vms by running the following command two times using these combinations for the name of the vm and its zone the script contents are identical for both vms vm_name of vm a1 and gcp_neg_zone zone of your choice vm_name of vm a2 and the same gcp_neg_zone zone gcloud compute instances create vm_name zone gcp_neg_zone image family debian 12 image project debian cloud tags allow ssh allow health check allow proxy only subnet subnet lb_su...
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