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description= Set up an internal passthrough Network Load Balancer with VM instance group backends;
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e and enter the following information name fw allow health check network lb network priority 1000 direction of traffic ingress action on match allow targets specified target tags target tags allow health check source filter ipv4 ranges source ipv4 ranges 35 191 0 0 16 130 211 0 0 22 protocols and ports allow all click create gcloud create the fw allow lb access firewall rule to allow communication from within the subnet gcloud compute firewall rules create fw allow lb access network lb network action allow direction ingress source ranges 10 1 2 0 24 10 3 4 0 24 rules tcp udp icmp create the fw allow ssh firewall rule to allow ssh connectivity to vms with the network tag allow ssh when you omit source ranges google cloud interprets the rule to mean any source gcloud compute firewall rules create fw allow ssh network lb network action allow direction ingress target tags allow ssh rules tcp 22 create the fw allow health check rule to allow google cloud health checks gcloud compute firewall rules create fw allow health check network lb network action allow direction ingress target tags allow health check source ranges 35 191 0 0 16 130 211 0 0 22 rules tcp udp icmp api create the fw allow lb access firewall rule by making a post request to the firewalls insert method post https compute googleapis com compute v1 projects project_id global firewalls name fw allow lb access network https www googleapis com compute v1 projects project_id global networks lb network priority 1000 sourceranges 10 1 2 0 24 10 3 4 0 24 allowed ipprotocol tcp ipprotocol udp ipprotocol icmp direction ingress logconfig enable false disabled false create the fw allow ssh firewall rule by making a post request to the firewalls insert method post https compute googleapis com compute v1 projects project_id global firewalls name fw allow ssh network https www googleapis com compute v1 projects project_id global networks lb network priority 1000 sourceranges 0 0 0 0 0 targettags allow ssh allowed ipprotocol tcp ports 22 direction ingress logconfig enable false disabled false create the fw allow health check firewall rule by making a post request to the firewalls insert method post https compute googleapis com compute v1 projects project_id global firewalls name fw allow health check network https www googleapis com compute v1 projects project_id global networks lb network priority 1000 sourceranges health_check_ranges targettags allow health check allowed ipprotocol tcp ipprotocol udp ipprotocol icmp direction ingress logconfig enable false disabled false replace the following project_id the project id health_check_ranges the comma separated list of google cloud health check probe ranges formatted as quoted strings for example 192 0 2 0 24 198 51 100 0 24 create backend vms and instance groups this example uses two unmanaged instance groups each having two backend server vms to demonstrate the regional nature of internal passthrough network load balancers the two instance groups are placed in separate zones us west1 a and us west1 c instance group ig a contains these two vms vm a1 vm a2 instance group ig c contains these two vms vm c1 vm c2 traffic to all four of the backend vms is load balanced to support this example and the additional configuration options each of the four vms runs an apache web server that listens on the following tcp ports 80 8008 8080 8088 443 and 8443 each vm is assigned an internal ip address in the lb subnet and an ephemeral external public ip address you can remove the external ip addresses later external ip address for the backend vms are not required however they are useful for this example because they permit the backend vms to download apache from the internet and they can connect using ssh by default apache is configured to bind to any ip address internal passthrough network load balancers deliver packets by preserving the destination ip ensure that server software running on your backend vms is listening on the ip address of the load balancer s internal forwarding rule if you configure multiple internal forwarding rules ensure that your software listens to the internal ip address associated with each one the destination ip address of a packet delivered to a backend vm by an internal passthrough network load balancer is the internal ip address of the forwarding rule for instructional simplicity these backend vms run debian gnu linux 12 console create backend vms in the google cloud console go to the vm instances page go to vm instances repeat steps 3 to 8 for each vm using the following name and zone combinations name vm a1 zone us west1 a name vm a2 zone us west1 a name vm c1 zone us west1 c name vm c2 zone us west1 c click create instance set the name as indicated in step 2 for region select us west1 and choose a zone as indicated in step 2 in the boot disk section ensure that debian gnu linux 12 bookworm is selected for the boot disk options if necessary click change to change the image click advanced options click networking and configure the following fields for network tags enter allow ssh and allow health check for network interfaces select the following network lb network subnet lb subnet ip stack type ipv4 single stack primary internal ipv4 address ephemeral automatic external ipv4 address ephemeral click management and then in the startup script field enter the following script the script contents are identical for all four vms bin bash if f etc startup_script_completed then exit 0 fi apt get update apt get install apache2 y a2ensite default ssl a2enmod ssl file_ports etc apache2 ports conf file_http_site etc apache2 sites available 000 default conf file_https_site etc apache2 sites available default ssl conf http_listen_prts listen 80 nlisten 8008 nlisten 8080 nlisten 8088 http_vh_prts 80 8008 8080 8088 https_listen_prts listen 443 nlisten 8443 https_vh_prts 443 8443 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 prt_conf cat file_ports prt_conf_2 echo prt_conf sed s listen 80 http_listen_prts prt_conf echo prt_conf_2 sed s listen 443 https_listen_prts echo prt_conf tee file_ports http_site_conf cat file_http_site http_site_conf_2 echo http_site_conf sed s 80 http_vh_prts echo http_site_conf_2 tee file_http_site https_site_conf cat file_https_site https_site_conf_2 echo https_site_conf sed s _default_ 443 https_vh_prts echo https_site_conf_2 tee file_https_site systemctl restart apache2 touch etc startup_script_completed click create create instance groups in the google cloud console go to the instance groups page go to instance groups repeat the following steps to create two unmanaged instance groups each with two vms in them using these combinations instance group name ig a zone us west1 a vms vm a1 and vm a2 instance group name ig c zone us west1 c vms vm c1 and vm c2 click create instance group click new unmanaged instance group set name as indicated in step 2 in the location section select us west1 for region and then choose a zone as indicated in step 2 for network select lb network for subnetwork select lb subnet in the vm instances section add the vms as indicated in step 2 click create gcloud create the four vms by running the following command four times using these four combinations for vm name and zone the script contents are identical for all four vms vm name vm a1 zone us west1 a vm name vm a2 zone us west1 a vm name vm c1 zone us west1 c vm name vm c2 zone us west1 c gcloud compute instances create vm name zone zone image family debian 12 image project debian cloud tags allow ssh allow health check subnet lb subnet metadata startup script bin bash if f etc startup_script_completed then exit 0 fi apt get update apt get install apache2 y a2ensite default ssl a2enmod ssl file_ports etc apache2 ports conf file_http_site etc apache2 sites available 000 default conf file_https_site etc apache2 sites available default ssl conf http_listen_prts listen 80 nlisten 8008 nlisten 8080 nlisten 8088 http_vh_prts 80 8008 8080 8088 https_listen_prts listen 443 nlisten 8443 https_vh_prts 443 8443 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 prt_conf cat file_ports prt_conf_2 echo prt_conf sed s listen 80 http_listen_prts prt_conf echo prt_conf_2 sed s listen 443 https_listen_prts echo prt_conf tee file_ports http_site_conf cat file_http_site http_site_conf_2 echo http_site_conf sed s 80 http_vh_prts echo http_site_conf_2 tee file_http_site https_site_conf cat file_https_site https_site_conf_2 echo https_site_conf sed s _default_ 443 https_vh_prts echo https_site_conf_2 tee file_https_site systemctl restart apache2 touch etc startup_script_completed create the two unmanaged instance groups in each zone gcloud compute instance groups unmanaged create ig a zone us west1 a gcloud compute instance groups unmanaged create ig c zone us west1 c add the vms to the appropriate instance groups gcloud compute instance groups unmanaged add instances ig a zone us west1 a instances vm a1 vm a2 gcloud compute instance groups unmanaged add instances ig c zone us west1 c instances vm c1 vm c2 api for the four vms use the following vm names and zones vm name vm a1 zone us west1 a vm name vm a2 zone us west1 a vm name vm c1 zone us west1 c vm name vm c2 zone us west1 c you can get the current debian_image_name by running the following gcloud command gcloud compute images list filter family debian 12 create four backend vms by making four post requests to the instances insert method post https compute googleapis com compute v1 projects project_id zones zone instances name vm name tags items allow health check allow ssh machinetype https www googleapis com compute v1 projects project_id zones zone machinetypes e2 standard 2 canipforward false networkinterfaces network https www googleapis com compute v1 projects project_id global networks lb network subnetwork https www googleapis com compute v1 projects project_id regions us west1 subnetworks lb subnet accessconfigs type one_to_one_nat name external nat networktier premium disks type persistent boot true mode read_write autodelete true devicename vm name initializeparams sourceimage projects debian cloud global images debian image name disktype projects project_id zones zone disktypes pd standard disksizegb 10 metadata items key startup script value bin bash napt get update napt get install apache2 y na2ensite default ssl na2enmod ssl nfile_ports etc apache2 ports conf nfile_http_site etc apache2 sites available 000 default conf nfile_https_site etc apache2 sites available default ssl conf nhttp_listen_prts listen 80 nlisten 8008 nlisten 8080 nlisten 8088 nhttp_vh_prts 80 8008 8080 8088 nhttps_listen_prts listen 443 nlisten 8443 nhttps_vh_prts 443 8443 nvm_hostname curl h metadata flavor google nhttp metadata google internal computemetadata v1 instance name necho page served from vm_hostname ntee var www html index html nprt_conf cat file_ports nprt_conf_2 echo prt_conf sed s listen 80 http_listen_prts nprt_conf echo prt_conf_2 sed s listen 443 https_listen_prts necho prt_conf tee file_ports nhttp_site_conf cat file_http_site nhttp_site_conf_2 echo http_site_conf sed s 80 http_vh_prts necho http_site_conf_2 tee file_http_site nhttps_site_conf cat file_https_site nhttps_site_conf_2 echo https_site_conf sed s _default_ 443 https_vh_prts necho https_site_conf_2 tee file_https_site nsystemctl restart apache2 scheduling preemptible false deletionprotection false create two instance groups by making a post request to the instancegroups insert method post https compute googleapis com compute v1 projects project_id zones us west1 a instancegroups name ig a network https www googleapis com compute v1 projects project_id global networks lb network subnetwork https www googleapis com compute v1 projects project_id regions us west1 subnetworks lb subnet post https compute googleapis com compute v1 projects project_id zones us west1 c instancegroups name ig c network https www googleapis com compute v1 projects project_id global networks lb network subnetwork https www googleapis com compute v1 projects project_id regions us west1 subnetworks lb subnet add instances to each instance group by making a post request to the instancegroups addinstances method post https compute googleapis com compute v1 projects project_id zones us west1 a instancegroups ig a addinstances instances instance https www googleapis com compute v1 projects project_id zones us west1 a instances vm a1 instance https www googleapis com compute v1 projects project_id zones us west1 a instances vm a2 post https compute googleapis com compute v1 projects project_id zones us west1 c instancegroups ig c addinstances instances instance https www googleapis com compute v1 projects project_id zones us west1 c instances vm c1 instance https www googleapis com compute v1 projects project_id zones us west1 c instances vm c2 configure load balancer components these steps configure all of the internal passthrough network load balancer components starting with the health check and backend service and then the frontend components health check in this example you use an http health check that checks for an http 200 ok status code for more information see the health check section backend service because you need to pass http traffic through the internal load balancer you need to use tcp not udp forwarding rule this example creates a single internal forwarding rule internal ip address in this example you specify an internal ip address 10 1 2 99 when you create the forwarding rule console start your configuration 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 network load balancer tcp udp ssl and click next for proxy or passthrough select passthrough load balancer and click next for public facing or internal select internal and click next click configure basic configuration on the create internal passthrough network load balancer page enter the following information load balancer name be ilb region us west1 network lb network configure the backends click backend configuration in the health check list click create a health check and enter the following information name hc http 80 protocol http port 80 proxy protocol none request note that when you use the google cloud console to create your load balancer the health check is global if you want to create a regional health check use gcloud or the api click create to handle only ipv4 traffic in the new backend section for ip stack type select the ipv4 single stack option in the instance group list select the ig c instance group and click done click add a backend and repeat the step to add the ig a instance group verify that there is a blue check mark next to backend co...
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