Docker process killed with cryptic `Killed` message

Docker for Mac limits the resource available to 2GB by default! This is too low for the app that I run. The solution is to increase the memory limit to 8GB, or however much your app needs.

(I am having similar issue albeit using a JVM application, not Python, and reached here by Google searching. From the deleted answer by @sergiu I am able to figure out the issue.)

Get started with Docker for Mac says:

Advanced settings are:

CPUs: By default, Docker for Mac is set to use half the number of processors available on the host machine. To increase processing power, set this to a higher number; to decrease, lower the number.

Memory: By default, Docker for Mac is set to use 2 GB runtime memory, allocated from the total available memory on your Mac. To increase RAM, set this to a higher number; to decrease it, lower the number.

Swap: Configure swap file size as needed. The default is 1 GB.

With Docker for Mac, you can get into the host VM namespace with:

docker run --net=host --ipc=host --uts=host --pid=host -it --security-opt=seccomp=unconfined --privileged --rm -v /:/host alpine /bin/sh

Then run chroot /host to change root to the host mount. Now, you can use utilities like dmesg to check for any OOM message (like the comments to your question suggest).

This happens because your application is consuming all the RAM available.You can monitor the RAM consumption and increase it.

This worked for me