I’ve run into a problem with Docker and can’t find any helpful answers searching the web.
I found https://stackoverflow.com/questions/21799382/is-there-a-maximum-number-of-containers-running-on-a-docker-host/21801470 to which the answer boils down to “the limit is set by the system resources”.
Either this doesn’t apply or - more likely - I don’t know the limit I’m running up against.
I have a Docker image based on
microsoft/dotnet:2.1-aspnetcore-runtime, created as Linux container and supposed to be running on Docker for Windows on a Win 10 Pro machine (during development).
The Docker Desktop version is 126.96.36.199 (31259).
I can start multiple containers of this image and they all work as supposed. However I’m not able to start more than the afore mentioned 64 containers using
docker run -d -v C:\Users\Public\Documents\DockerShare:/app/SharedData dockerImage:latest
I started out with a 10GB limit for Docker and already increased it to 16GB, but to no avail. Also the 64 machines runnig a kestrel server only account for a 1.8GB (when idle, as they are right after being started) of memory used.
Another touching point is a share that each of the containers mounts when started.
I also checked https://docs.docker.com/engine/reference/commandline/dockerd/#daemon-configuration-file but there doesn’t seem to be a property to limit the number of containers in there.
I have tried the same on an Ubuntu 18.04.2 LTS with the same result.
Once I reach the start of container #65 the container immediately exits with code 139.
The volume is of course changed to a linux path like
docker run -d -v ~/DockerShare:/app/SharedData dockerImage:latest
The Docker version here is 18.09.6, build 481bc77