-On a Windows-based [!INCLUDE[ssnoversion-md](../includes/ssnoversion-md.md)] installation, some components are installed even in a basic engine install, while others are not. Under Linux, only the [!INCLUDE[ssnoversion-md](../includes/ssnoversion-md.md)] engine is installed as part of the installation process. Everything else is optional. For highly available [!INCLUDE[ssnoversion-md](../includes/ssnoversion-md.md)] instances under Linux, two packages should be installed at the same time as [!INCLUDE[ssnoversion-md](../includes/ssnoversion-md.md)]: [!INCLUDE[ssnoversion-md](../includes/ssnoversion-md.md)] Agent (*mssql-server-agent*) and the high availability (HA) package (*mssql-server-ha*). While [!INCLUDE[ssnoversion-md](../includes/ssnoversion-md.md)] Agent is technically optional, it is [!INCLUDE[ssnoversion-md](../includes/ssnoversion-md.md)]’s scheduler for jobs and is required by log shipping, so installation is recommended. On Windows-based installations, [!INCLUDE[ssnoversion-md](../includes/ssnoversion-md.md)] Agent is not optional.
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