MSSQL master Database Maintenance
Command line options to start SQL server in single user mode for master database restore. Add -f for a minimal setup.
sqlservr.exe -c -m –sINSTANCENAME
Setup option to recreate the master database.
./setup.exe /QUIET /ACTION=REBUILDDATABASE /INSTANCENAME=MSSQLSERVER /SQLSYSADMINACCOUNTS=DOMAIN\adminaccount