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Docker Compose sets sysctls, ulimits kernel parameters

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Posted on 2/14/2026 9:31:38 AM | | |
Starting with Docker 1.12.0 released in July 2016, docker run --sysctl net.core.somaxconn=65535 allows you to adjust kernel parameters inside a container using the following command. Docker Compose initially didn't have a setting to support this option, but starting with Docker Compose 1.10.0 released in January 2017, it is possible to set kernel parameters, so we'll briefly cover them here.

In July 2016, a proposal was made to allow kernel parameters to be configured via Docker Compose, but the proposal was not merged for a long time. Eventually, the proposal was merged in December of the same year and included in Docker Compose 1.10, which was released in January of the following year.

sysctls: sysctls defines the kernel parameters to be set in the container. sysctls can use arrays or mappings.
ulimits: ulimits overrides the default value of the container. It can be specified as an integer value for a single limit, or as a mapping relationship for a soft/hard limit.

Official document parameter configuration：The hyperlink login is visible.

The yml configuration is as follows (not tested):






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