Database Mirroring - Use Certificates for Inbound Connections

Artikel
03/03/2023

Applies to: SQL Server

This topic describes the steps for configuring server instances to use certificates to authenticate inbound connections for database mirroring. Before you can set up inbound connections, you must configure outbound connections on each server instance. For more information, see Allow a Database Mirroring Endpoint to Use Certificates for Outbound Connections (Transact-SQL).

The process of configuring inbound connections, involves the following general steps:

Create a login for other system.
Create a user for that login.
Obtain the certificate for the mirroring endpoint of the other server instance.
Associate the certificate with the user created in step 2.
Grant CONNECT permission on the login for that mirroring endpoint.

If there is a witness, you must also set up inbound connections for it. This requires setting up logins, users, and certificates for the witness on both of the partners, and vice versa.

The following procedure describes these steps in detail. For each step, the procedure provides an example for configuring a server instance on a system named HOST_A. The accompanying Example section demonstrates the same steps for another server instance on a system named HOST_B.

To configure server instances for inbound mirroring connections (on HOST_A)

Create a login for the other system.

The following example creates a login for the system, HOST_B, in the master database of the server instance on HOST_A; in this example, the login is named HOST_B_login. Substitute a password of your own for the sample password.
```
USE master;  
CREATE LOGIN HOST_B_login   
   WITH PASSWORD = '1Sample_Strong_Password!@#';  
GO  
```
For more information, see CREATE LOGIN (Transact-SQL).

To view the logins on this server instance, you can use the following Transact-SQL statement:
```
SELECT * FROM sys.server_principals  
```
For more information, see sys.server_principals (Transact-SQL).
Create a user for that login.

The following example creates a user, HOST_B_user, for the login created in the preceding step.
```
USE master;  
CREATE USER HOST_B_user FOR LOGIN HOST_B_login;  
GO  
```
For more information, see CREATE USER (Transact-SQL).

To view the users on this server instance, you can use the following Transact-SQL statement:
```
SELECT * FROM sys.sysusers;  
```
For more information, see sys.sysusers (Transact-SQL).
Obtain the certificate for the mirroring endpoint of the other server instance.

If you have not already done so when configuring outbound connections, obtain a copy of the certificate for the mirroring endpoint of the remote server instance. To do this, back up the certificate on that server instance as described in Allow a Database Mirroring Endpoint to Use Certificates for Outbound Connections (Transact-SQL). When copying a certificate to another system, use a secure copy method. Be extremely careful to keep all of your certificates secure.

For more information, see BACKUP CERTIFICATE (Transact-SQL).
Associate the certificate with the user created in step 2.

The following example, associates the certificate of HOST_B with its user on HOST_A.
```
USE master;  
CREATE CERTIFICATE HOST_B_cert  
   AUTHORIZATION HOST_B_user  
   FROM FILE = 'C:\HOST_B_cert.cer'  
GO  
```
For more information, see CREATE CERTIFICATE (Transact-SQL).

To view the certificates on this server instance, use the following Transact-SQL statement:
```
SELECT * FROM sys.certificates  
```
For more information, see sys.certificates (Transact-SQL).
Grant CONNECT permission on the login for the remote mirroring endpoint.

For example, to grant permission on HOST_A to the remote server instance on HOST_B to connect to its local login-that is, to connect to HOST_B_login-use the following Transact-SQL statements:
```
USE master;  
GRANT CONNECT ON ENDPOINT::Endpoint_Mirroring TO [HOST_B_login];  
GO  
```
For more information, see GRANT Endpoint Permissions (Transact-SQL).

This completes setting up certificate authentication for HOST_B to log in to HOST_A.

You now need to perform the equivalent inbound steps for HOST_A on HOST_B. These steps are illustrated in the inbound portion of the example in the Example section, below.

Example

The following example demonstrates configuring HOST_B for inbound connections.

Note

This example uses a certificate file containing the HOST_A certificate that is created by a code snippet in Allow a Database Mirroring Endpoint to Use Certificates for Outbound Connections (Transact-SQL).

USE master;  
--On HOST_B, create a login for HOST_A.  
CREATE LOGIN HOST_A_login WITH PASSWORD = 'AStrongPassword!@#';  
GO  
--Create a user, HOST_A_user, for that login.  
CREATE USER HOST_A_user FOR LOGIN HOST_A_login  
GO  
--Obtain HOST_A certificate. (See the note   
--   preceding this example.)  
--Associate this certificate with the user, HOST_A_user.  
CREATE CERTIFICATE HOST_A_cert  
   AUTHORIZATION HOST_A_user  
   FROM FILE = 'C:\HOST_A_cert.cer';  
GO  
--Grant CONNECT permission for the server instance on HOST_A.  
GRANT CONNECT ON ENDPOINT::Endpoint_Mirroring TO HOST_A_login  
GO

If you intend to run in high-safety mode with automatic failover, you must repeat the same set up steps to configure the witness for outbound and inbound connections.

For information on creating a mirror database, including a Transact-SQL example, see Prepare a Mirror Database for Mirroring (SQL Server).

For a Transact-SQL example of establishing a high-performance mode session, see Example: Setting Up Database Mirroring Using Certificates (Transact-SQL).

.NET Framework Security

When copying a certificate to another system, use a secure copy method. Be extremely careful to keep all of your certificates secure.

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Database Mirroring - Use Certificates for Inbound Connections

To configure server instances for inbound mirroring connections (on HOST_A)

Example

.NET Framework Security

See Also

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