What can you use to restrict a container's access to the host's resources?

Resource limits are critical when it comes to managing a container's access to the host's resources. By specifying resource limits, you can control the amount of CPU and memory that a container can utilize. This ensures that a single container does not consume all available resources on the host, which could lead to performance degradation or even crashes of other containers and the host itself.

For example, you can set limits on how much memory a container can use by using flags when starting the container with the Docker run command or within a Docker Compose file. If the container exceeds its memory limit, it may be terminated by the system (Out Of Memory killer), ensuring overall host stability.

In contrast, options like network mode, Docker Compose settings, and Dockerfile commands do not specifically limit resource usage directly. Network mode deals with how containers connect to networks, Docker Compose settings allow for defining how to run multiple containers together, and Dockerfile commands are utilized to build images rather than impose resource restrictions. Thus, resource limits provide the necessary mechanism to restrict and manage a container's access effectively.