Os Process Cgroup

In this tutorial, you'll learn about How to Fix Cgroups Errors. We cover key concepts, practical examples, and best practices.

Fix cgroups errors when container not aware of cgroup memory limits causing OOM.

Quick Fix

Wrong

import os
mem=os.sysconf('SC_PAGE_SIZE')*os.sysconf('SC_PHYS_PAGES')
print(f'System memory: {mem}')  # host memory, not container limit!

Reads host total memory, not cgroup limit. May allocate more than container allows.

Right

import os
def get_cgroup_mem():
    try:
        with open('/sys/fs/cgroup/memory/memory.limit_in_bytes') as f:
            limit=int(f.read())
            if limit<2**60: return limit  # cgroup limit set
    except: pass
    return os.sysconf('SC_PAGE_SIZE')*os.sysconf('SC_PHYS_PAGES')
print(f'Available: {get_cgroup_mem()}')

Returns cgroup memory limit in container, host memory otherwise.

Prevention

Read /sys/fs/cgroup to detect container limits. Never trust sysconf in containerized environments.

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