Dynamic container-based application resource tuning and resizing is disclosed. One or more container resource constraint values associated with a first container are accessed. One or more application resource constraint values based on the one or more container resource constraint values are determined. A first application execution of an application is initiated in the first container. The one or more application resource constraint values are provided to the first application execution. An analysis of a plurality of resource usage metrics generated during the first application execution of the application is performed. Each resource usage metric quantifies a use of a corresponding resource associated with the first container during the first application execution. One or more optimized container resource constraint values are determined based on the analysis.