I would like to configure docker memory limit differently depending on the step I run.
In fact I have a step that perform tests and use a lot of memory using docker-compose, but some other steps that just build the docker image.
For instance one step that use docker with 1GB and another one with 6GB to hold my several services
Is it possible to override docker memory limit for a specific step ?
We have the exact same requirement as @Victor Fleurant . We are running our tests in docker-compose and get "Container 'docker' exceeded memory limit." some times. It's really annoying and breaks the whole CI process.
Just need the "Docker" service in the Test step to have more memory, but there's no way to define that other than adding a memory limit in "definitions", which affects other steps using the "Docker-in-Docker" service.
Any chance of making a feature request for this?
From what I remember you can control the memory limit first of all by choosing between two options, the standard one (4GB) and then there is one to double the resources (8GB).
If you want to bring memory limit down (from either of those two), you have to add services. Each service divides the overall limit. E.g. Having three services brings down the limit for the pipeline script itself from 4GB to 1GB.
Going from 8GB to 6GB does not look to be mathematically possible this way, only from 8GB to 4GB (one service) but then you could just run with 4GB as the default.
Running docker rootless inside a pipeline would not add more options here as it is limited on limiting resources:
Currently, rootless mode ignores cgroup-related docker run flags such as --cpus and memory.
However, traditional ulimit and cpulimit can be still used, though they work in process-granularity rather than in container-granularity.
E.g. see ulimit and sysctl (www.LinuxHowtos.org) and the administration and configuration guide of your choice.
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