![]() You can read more about subscribing to those events on Using Amazon RDS Event Notification. The closest you can come is to monitor reboots and failovers via SNS events. ![]() Unfortunately, there is no current notification of a host replacement. This means that linked servers with passwords will get the error “An error occurred during decryption” when you try to use the linked server. Now that RDS SQL Server has the outbound networking improvement, linked servers are fully supported for SQL Server targets, and the previous limitations described in the older version of this blog post no longer apply.Īdditional note: If a host replacement happens, RDS SQL Server does not restore the service master key. Alternatively, you can create the linked servers on the primary instance, fail over to the high availability server instance, and then create the linked servers again so that they are on both instances of RDS SQL Server. If the linked servers are added before the configuration is changed to add mirroring or AlwaysOn, then the linked servers are copied, but only once. Note: RDS SQL Server currently doesn’t replicate linked servers to the mirrored database server (or AlwaysOn Availability Group secondary server) in a Multi-AZ deployment. To mitigate this risk, AWS recommends that you use the DNS names rather than IP addresses for linked server connectivity. Thus, if the linked server connection fails to an RDS SQL Server instance, and you have chosen to reference the server by IP address instead of DNS name, your first troubleshooting steps should include verifying that the private IP address of the RDS instance has not changed. This change can happen with no alerts or notifications to your administrative team. One limitation for all RDS instances is that if the physical server supporting your RDS SQL Server instance changes (such as when upgrading to a new version of SQL Server or changing the instance type), the private IP address of the RDS instance of SQL Server might change. ![]() If the target server is another RDS SQL Server installation, AWS recommends that you use the DNS name to protect from IP address changes due to host replacements or server changes. Note that in this example we are impersonating a single RDS standard user account. Variables you should replace are listed in angle brackets. The example code here is a connection to an RDS server in the cloud. This scenario is the simplest one, because you can use either use the SSMS graphical interface or just submit the Transact-SQL statements to create the linked server. SQL Server (EC2 or on-premises) to RDS SQL Serverįor this scenario, an EC2 or on-premises instance of SQL Server is connecting to an instance of RDS SQL Server. In other words, if you’re connecting EC2 SQL Server to RDS SQL Server, you must allow traffic from the IP address of the EC2 instance, as well as on the port that SQL Server is using to listen for database communications. However, calling the stored procedure sp_addlinkedserver and then the stored procedure sp_addlinkedserverlogin directly from a query window lets an administrator add linked servers to the RDS installation of SQL Server.įor each of the examples following, you must allow network traffic by using the appropriate TCP port through the Security group for each inbound instance of SQL Server. Unfortunately, this approach prevents users from even launching the dialog box to use to create the needed Transact-SQL script. SQL Server Management Studio (SSMS) requires system admin rights to create a linked server using the graphical interface, which isn’t available in an RDS environment. AWS recommends that RDS SQL Server installations should generally be only privately accessible (that is, not directly exposed to the Internet). Until the outbound networking improvement was released, linked server traffic was restricted to a single VPC. RDS SQL Server to SQL Server (RDS, EC2, or on-premises).SQL Server (EC2 or on-premises) to RDS SQL Server. ![]() In this blog post, we focus on connectivity to other instances of SQL Server in Amazon RDS, hosted in Amazon EC2, or available from your data centers via a VPN or direct connect. Linked servers allow Microsoft SQL Server to run SQL Server statements on other instances of database servers.
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