os

The instance's operating system, which must be set to one of the following. You cannot update an instance that is using a custom AMI.

• A supported Linux operating system: An Amazon Linux version, such as Amazon Linux 2, Amazon Linux 2018.03, Amazon Linux 2017.09, Amazon Linux 2017.03, Amazon Linux 2016.09, Amazon Linux 2016.03, Amazon Linux 2015.09, or Amazon Linux 2015.03.

• A supported Ubuntu operating system, such as Ubuntu 18.04 LTS, Ubuntu 16.04 LTS, Ubuntu 14.04 LTS, or Ubuntu 12.04 LTS.

• CentOS Linux 7

• Red Hat Enterprise Linux 7

• A supported Windows operating system, such as Microsoft Windows Server 2012 R2 Base, Microsoft Windows Server 2012 R2 with SQL Server Express, Microsoft Windows Server 2012 R2 with SQL Server Standard, or Microsoft Windows Server 2012 R2 with SQL Server Web.

Not all operating systems are supported with all versions of Chef. For more information about supported operating systems, see OpsWorks Stacks Operating Systems.

The default option is the current Amazon Linux version. If you set this parameter to Custom, you must use the AmiId parameter to specify the custom AMI that you want to use. For more information about how to use custom AMIs with OpsWorks, see Using Custom AMIs.

You can specify a different Linux operating system for the updated stack, but you cannot change from Linux to Windows or Windows to Linux.