Default ulimit is configured appropriately
Set up the docker integration.
Description
Set the default ulimit options as appropriate in your environment.
Rationale
ulimit provides control over the resources available to the shell and to processes which it starts. Setting system resource limits judiciously can save you from disasters such as a fork bomb. On occasion, even friendly users and legitimate processes can overuse system resources and can make the system unusable. Setting the default ulimit for the Docker daemon enforces the ulimit for all container instances, so that you do not need to set up ulimit for each container instance. However, the default ulimit can be overridden during container runtime. Therefore, in order to have proper control over system resources, define a default-ulimit as is needed in your environment.
Audit
To confirm the default-ulimit setting, review the dockerd startup options and settings in /etc/docker/daemon.json. To review the dockerd startup options, run:
Ensure that the --default-ulimit parameter is set as appropriate.
Also review the /etc/docker/daemon.json file for this setting.
Run Docker in daemon mode and pass --default-ulimit as argument with respective ulimits as appropriate in your environment and in line with your security policy.
For example, dockerd --default-ulimit nproc=1024:2048 --default-ulimit nofile=100:200
Impact
If ulimits are set incorrectly this could cause issues with system resources, possibly causing a denial of service condition.
Default value
By default, no ulimit is set.
References
- https://docs.docker.com/edge/engine/reference/commandline/dockerd/#default-ulimits
CIS controls
Version 6
18 Application Software Security Application Software Security
