1

I am new to Always On Availability Groups and I am little bit confused with creation of logins.

Let's assume an environment NODE1(Primary) & NODE2(secondary) & NODE3(Stand by) & VAEWI(Listener).

  1. I need to create a SQL authentication login.

    For this, I assume I need to create it by connecting to listener that which will sync in all of the nodes.

  2. I need to create a Windows authentication.

    For this I think, as all of the nodes are window-clustered before creating the availability group. So, we need to create a Windows user 1st in primary node and then create a Windows authentication by connecting to the listener.

Can anyone let me know if my assumptions are true?

6

Putting in a simple language :

A login gives you access to server.

A user gives you access to database.

A login must map a user so that you can access the database.

For SQL Authentication, you should create the login with SAME SID and map it to your user database/s on all the nodes with proper permissions (follow the principle of least privileged). This script will help you or this SSMS addin from sqlskills.

For Windows Authentication, you should create a login and map it to your user database. Create/transfer the same login to other nodes.

A listener is a virtual interface and has nothing to do with logins or users.

  • Can I just create a login and then mapped it to a user /database and do the same thing on the secondary ? – SqlNovice Dec 19 '17 at 16:57
  • On Secondary, just create login with same sid. The db permissions are inherited. – Kin Shah Dec 19 '17 at 16:59
  • I guess we need this for sql logins only not windows authenticated logins – SqlNovice Dec 19 '17 at 17:01
  • Yes.. for windows login, you dont have to use sid, since sid for windows login never change. For sql logins, you have to use same sid across all nodes. – Kin Shah Dec 19 '17 at 17:21

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