Sitecore 10 Docker installation – Missing database

After using Docker Compose to start Sitecore 10 with Docker it appeared that the traefik and cm containers were unhealthy when viewing the containers using the docker ps command

After some investigation I noticed the following error and it turned out that the Sitecore.Master database was not attached at all despite all of the other databases being in position

Exception: System.Data.SqlClient.SqlException
Message: Cannot open database "Sitecore.Master" requested by the login. The login failed.

This is easy to spot if you use the docker logs command.

docker logs --tail 100 {container id}

The mdf and ldf files were in place in the container but they appeared to be corrupt. This is not necessarily a problem because the getting started guide (https://www.sitecore.com/knowledge-center/blog/359/getting-started-as-a-developer-4499) comes with all of the databases which are held in getting-started/mssql-data

My initial attempts led me to the following error which would not allow me to copy to the container

Error response from daemon: filesystem operations against a running Hyper-V container are not supported

This was resolved by stopping and starting the container before and after copying the files

docker stop {container id}

docker cp C:\sitecore\docker\getting-started\mssql-data\Sitecore.Master_Primary.mdf  sitecore-xp0_mssql_1:/data

docker cp C:\sitecore\docker\getting-started\mssql-data\Sitecore.Master_Primary.ldf  sitecore-xp0_mssql_1:/data

docker start {container id}

Once the files are copied you can check they are in place using the following command to open up an interfactive powershell session

docker exec -it {container id} powershell

Unfortunately after attempting to attach the database in SQL Server Management studio I kept receiving the following error.

Unable to open the physical file "C:\test\Sitecore.Master_Primary.mdf". Operating system error 5: "5(Access is denied.)".
CREATE DATABASE failed. Some file names listed could not be created. Check related errors. (Microsoft SQL Server, Error: 5120)

To resolve this you need to use c:/data which contains the other databases