Merge pull request #648 from amvin87/patch-2

Update README.md

Author: amvin87-zz

linux/preview/SLES/README.md

@@ -1,39 +1,31 @@
 # How to build a SQL Server on SLES container image
 
-**Prerequisites - Get SLES Container Images** 
-SUSE Enterprise Linux Containers are not avalaible on any public repositories. Follow the steps below to get the container base OS locally:
+1. Ensure that host machine is running the same version of the SLES that you will build SQL Server 2019 container image, in this case we are using a host which is running SLES 12 SP 5 and building the SQL Server also on top of SLES 12 SP 5.
 
-a.	Activate the container module via yast by typing in ```yast2``` and following the prompts. 
+2. Please ensure the host machine is registered using the SUSEConnect command as documented here: https://www.suse.com/support/kb/doc/?id=000018564
 
-b.	Search for the available SLES images with ```zypper se *-image```
-
-c.	Install one of those images with zypper install, for example, ```zypper in sles12sp2-docker-image```
-
-d.	List out the installed images with ```sle2docker list```
-
-e.	Activate the image with sle2docker, for example ```sle2docker activate sles12sp1-docker.x86_64-1.0.5-Build10.18```
-
-f.	Check that the image available with ```docker image ls```
-
-
-For full details: https://www.suse.com/documentation/sles-12/singlehtml/book_sles_docker/book_sles_docker.html#docker.building.images
+3. You can verify that the host machine is registered using a command shown below, the output you should see the status as registered and other details like the regcode.
+    ```
+    SUSEConnect -s
+    ```
 
 **Steps to building SQL Server on SLES container image**
 
-1.	Copy the  SUSE_Linux_Enterprise_Server zypper repository and service files into this directory which is required for the *libsss_nss_idmap0* package. Example:
-    ```
-     sudo cp /etc/zypp/services.d/SUSE_Linux_Enterprise_Server_12_SP4_x86_64.service /path/to/dockerfile/
-     sudo cp /etc/zypp/repo.d/SUSE_Linux_Enterprise_Server_12_SP4_x86_64:SLES12-SP4-Pool.repo /path/to/dockerfile/
-    ```
+1.	Create the dockerfile as shown in the dockerfile command and save it into your working directory
+
 2.	[optional] Customize the mssql.conf file. Example mssql.conf entries can be found here: https://docs.microsoft.com/en-us/sql/linux/sql-server-linux-configure-mssql-conf?view=sql-server-2017#mssql-conf-format 
 
 3.	Build the docker image. 
     ```
-    docker build . -t mssql-sles
+    docker build . -t mssql-sles-tools-nonroot
+    ```
+4. Confirm the image is successfully created using the command
+    ```
+    docker images
     ```
 4. Run the docker image. 
     ```
     sudo docker run -e 'ACCEPT_EULA=Y' -e 'SA_PASSWORD=<YourStrong!Passw0rd>' \
    -p 1433:1433 --name sql1 \
-   -d mssql-sles
+   -d mssql-sles-tools-nonroot
     ```