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need to contain any data return to the remote desktop session on node 1 open the sql server management studio in the connect to server dialog verify the server name is set to node 1 and select connect in the menu select file new query with current connection paste the following sql script into the editor create a sample database create database bookshelf on primary name bookshelf filename d data bookshelf mdf size 256mb maxsize unlimited filegrowth 256mb log on name bookshelf_log filename d logs bookshelf ldf size 256mb maxsize unlimited filegrowth 256mb go use bookshelf set ansi_nulls on set quoted_identifier on go create sample table create table dbo books id bigint identity 1 1 not null title nvarchar max not null author nvarchar max null publisheddate datetime null imageurl nvarchar max null description nvarchar max null createdbyid nvarchar max null constraint pk_dbo books primary key clustered id asc with pad_index off statistics_norecompute off ignore_dup_key off allow_row_locks on allow_page_locks on on primary on primary textimage_on primary go create a backup exec dbo sp_changedbowner loginame sa map false alter database bookshelf set recovery full go backup database bookshelf to disk witness backup bookshelf bak with init go the script creates a new database with a single table and performs an initial backup to witness select execute to run the sql script configure high availability you can now configure high availability for the availability group using either t sql or sql server management studio using t sql to configure high availability for the availability group using t sql use the following steps connect to node 1 and then execute the following script to create the bookshelf ag availability group create login net_domain sql_server from windows go use bookshelf create user net_domain sql_server for login net_domain sql_server go use master create endpoint bookshelf_endpoint state started as tcp listener_port 5022 for database_mirroring role all go grant connect on endpoint bookshelf_endpoint to net_domain sql_server go note in the net_domain sql_server login and user net_domain is the netbios name of your active directory domain connect to node 2 and execute the following script create login net_domain sql_server from windows go create endpoint bookshelf_endpoint state started as tcp listener_port 5022 for database_mirroring role all go grant connect on endpoint bookshelf_endpoint to net_domain sql_server go note in the net_domain sql_server login and user net_domain is the netbios name of your active directory domain on node 1 and then execute the following script to create the bookshelf ag availability group use master go create availability group bookshelf ag with automated_backup_preference secondary cluster_type wsfc db_failover on for database bookshelf replica on n node 1 with endpoint_url tcp node 1 5022 availability_mode synchronous_commit failover_mode automatic backup_priority 50 seeding_mode automatic secondary_role allow_connections no n node 2 with endpoint_url tcp node 2 5022 availability_mode synchronous_commit failover_mode automatic backup_priority 50 seeding_mode automatic secondary_role allow_connections no go in the following script replace listener_ip with the ip address that you reserved earlier for the internal load balancer and execute it use master go alter availability group bookshelf ag add listener n bookshelf with ip n listener_ip n 255 255 255 0 port 1433 go connect to node 2 and then execute the following script to join the secondary replica to the availability group and enable automatic seeding use master go alter availability group bookshelf ag join alter availability group bookshelf ag grant create any database check the status of the availability group select from sys dm_hadr_availability_group_states go you should see synchronization_health_desc as healthy using sql server management studio to configure high availability for the availability group using sql server management studio use the following steps in the object explorer window right click always on high availability and then select new availability group wizard on the specify options page set the availability group name to bookshelf ag then select next on the select databases page select the bookshelf database then select next on the specify replicas page select the replicas tab select add replica in the connect to server dialog enter the server name node 2 and select connect the list of availability replicas now contains sql server instances node 1 and node 2 set the availability mode to synchronous commit for both instances set automatic failover to enabled for both instances select the listener tab select create an availability group listener enter the following settings listener dns name bookshelf port 1433 network mode static ip select add and enter the listener ip address listener_ip that you reserved earlier for the internal load balancer then select ok select next on the select data synchronization page select automatic seeding on the validation page verify that all checks are successful on the summary page select finish on the results page select close create internal load balancers and health checks the cluster ip represents a single endpoint for the windows failover cluster you use it for administrative purposes and managing cluster resources the cluster ip always points to the host or primary node of the cluster you deploy an internal load balancer that uses a health check that ensures that traffic is directed to the host node of the cluster as wsfc tooling requires multiple protocols to be available for forwarding icmp udp and tcp we recommend deploying an internal load balancer with multiple protocols that support all ports to deploy an internal load balancer use the following steps return to your existing cloud shell session create two unmanaged instance groups one per zone and add the two nodes to the groups region gcloud config get value compute region gcloud compute instance groups unmanaged create wsfc group 1 zone zone1 gcloud compute instance groups unmanaged add instances wsfc group 1 zone zone1 instances node 1 gcloud compute instance groups unmanaged create wsfc group 2 zone zone2 gcloud compute instance groups unmanaged add instances wsfc group 2 zone zone2 instances node 2 create health check for the cluster ip that the load balancer can use to determine which is the active node from the windows cluster perspective the default port which the compute engine guest agent responds to health checks is 59998 the health check provides the cluster ip address in the request and it expects 1 as a response returned from the active node gcloud compute health checks create tcp wsfc healthcheck request cluster_ip response 1 check interval 2s healthy threshold 2 unhealthy threshold 2 port 59998 timeout 1s create a backend service and add the two existing instance groups gcloud compute backend services create wsfc backend load balancing scheme internal region region health checks wsfc healthcheck protocol unspecified gcloud compute backend services add backend wsfc backend instance group wsfc group 1 instance group zone zone1 region region gcloud compute backend services add backend wsfc backend instance group wsfc group 2 instance group zone zone2 region region create the internal load balancer associated with the cluster ip gcloud compute forwarding rules create wsfc load balancing scheme internal address cluster_ip ports all network vpc_name subnet subnet_name region region ip protocol l3_default backend service wsfc backend to provide a single endpoint for sql server clients that want to connect to any database in your bookshelf availability group deploy a new internal load balancer dedicated to that availability group use the following steps create a health check for the availability group listener that the load balancer can use to determine which is the primary node in the bookshelf sql server availability group gcloud compute health checks create tcp wsfc bookshelf healthcheck request listener_ip response 1 check interval 2s healthy threshold 1 unhealthy threshold 2 port 59998 timeout 1s the health check uses the same compute engine guest agent port but it provides in its request the listener ip address of the bookshelf availability group create a new backend service and add the two instance groups gcloud compute backend services create wsfc bookshelf backend load balancing scheme internal region region health checks wsfc bookshelf healthcheck protocol unspecified gcloud compute backend services add backend wsfc bookshelf backend instance group wsfc group 1 instance group zone zone1 region region gcloud compute backend services add backend wsfc bookshelf backend instance group wsfc group 2 instance group zone zone2 region region create the internal load balancer associated with the sql server bookshelf ag availability group listener gcloud compute forwarding rules create wsfc bookshelf load balancing scheme internal address listener_ip ports all network vpc_name subnet subnet_name region region ip protocol l3_default backend service wsfc bookshelf backend you can now connect to sql server availability group listener by using the dns name bookshelf and its port defined in the bookshelf availability group listener the internal load balancer directs traffic to the primary node of the bookshelf availability group to create multiple availability groups on a single failover cluster you must use separate backend services and a separate load balancer with its own healthcheck per availability group each availability group might have different nodes designated as the primary and they might be different than the host node of the windows cluster for multiple availability groups you need the following a reserved static ip address for the availability group listener that the internal load balancer uses reserve one address for each availability group a separate health check rule for each availability group the request of the health check provides the static ip address of the availability group listener which is also the reserved ip address at the previous step the health check probes for response 1 returned by the gce agent all health checks use port 59998 a separate backend service for each availability group to which you add the existing two compute instance groups the backend service uses the health check defined at the previous step an internal load balancer for each availability group for the backend service created at the previous step the load balancer is associated with the availability group listener static ip address test the failover you are now ready to test if the failover works as expected return to the powershell session on witness run the following script while true conn new object system data sqlclient sqlconnection conn connectionstring server tcp bookshelf 1433 integrated security true initial catalog master conn open cmd new object system data sqlclient sqlcommand cmd connection conn cmd commandtext select serverproperty servername adapter new object system data sqlclient sqldataadapter cmd data new object system data dataset adapter fill data out null data tables 0 get date format mm dd yyyy hh mm ss start sleep seconds 2 in this guide we used the dns name bookshelf and the port value 1433 for the availability group listener in the server definition tcp bookshelf 1433 every 2 seconds the script connects to sql server by using the availability group listener and queries the server name leave the script running return to the remote desktop session on node 1 to trigger a failover in sql server management studio navigate to always on high availability availability groups bookshelf ag primary and right click the node select failover on the select new primary replica page verify that node 2 is selected as new primary replica and that the failover readiness column indicates no data loss then select next on the connect to replica page select connect in the connect to server dialog verify that the server name is node 2 and click connect select next and then finish on the results page verify that the failover was successful return to the powershell session on witness observe the output of the running script and notice that the server name changes from node 1 to node 2 as a result of the failover stop the script by pressing ctrl c clean up after you finish the tutorial you can clean up the resources that you created so that they stop using quota and incurring charges the following sections describe how to delete or turn off these resources delete the project the easiest way to eliminate billing is to delete the project that you created for the tutorial to delete the project caution deleting a project has the following effects everything in the project is deleted if you used an existing project for the tasks in this document when you delete it you also delete any other work you ve done in the project custom project ids are lost when you created this project you might have created a custom project id that you want to use in the future to preserve the urls that use the project id such as an appspot com url delete selected resources inside the project instead of deleting the whole project if you plan to explore multiple architectures tutorials or quickstarts reusing projects can help you avoid exceeding project quota limits in the google cloud console go to the manage resources page go to manage resources in the project list select the project that you want to delete and then click delete in the dialog type the project id and then click shut down to delete the project what s next learn how you can configure a sql server failover cluster instance that uses storage spaces direct learn how you can configure a sql server failover cluster instance that uses persistent disk in multi writer mode send feedback except as otherwise noted the content of this page is licensed under the 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