Steve Jones shows how to install and configure the SQL Agent for Linux:
When I first started playing with this version, I noticed that SQL Agent was disabled. That’s not great, since SQL Agent is a great tool for various tasks in SQL Server. I can’t start the agent from here, as the underlying implementation is different, and I’m not really a host OS admin when connecting in SSMS.
After checking which patch level I was at (CU6), I changed to my Linux console, and ran the configuration utility. For Linux, this is mssql-conf.
It’s not an overly complicated process but the process is a bit different from Windows, so check it out.