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After some crashes with a docker container with a too low mem_limit, how can i check in a container the mem_limit of this container? I want to print an error message on startup and exit if the mem_limit is set to low.
748
In the latest versions of Docker, something like this is possible: docker exec <container> bash . So, you just open a shell inside the container. Similarly, you can do: docker exec <container> ls <dir path> and docker exec <container> cat <file path> . For bash however, add the -it options.
Like it was mentioned, if you are already inside of a container, then just use ps -eaf command to see the running processes.
The memory limit is enforced via cgroups. Therefore you need to use cgget to find out the memory limit of the given cgroup.
We can get CPU usage of docker container with docker stats command. The column CPU % will give the percentage of the host's CPU the container is using.
The memory limit is enforced via cgroups. Therefore you need to use cgget to find out the memory limit of the given cgroup.
To test this you can run a container with a memory limit:
docker run --memory 512m --rm -it ubuntu bash
Run this within your container:
apt-get update
apt-get install cgroup-bin
cgget -n --values-only --variable memory.limit_in_bytes /
# will report 536870912
Docker 1.13 mounts the container's cgroup to /sys/fs/cgroup (this could change in future versions). You can check the limit using:
cat /sys/fs/cgroup/memory/memory.limit_in_bytes
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