PID namespace — 3 Technical Articles

Dec 27, 2022 · Fundamentals

Understanding Linux PID Namespace Creation and Allocation in Containers

This article explains how Linux creates and allocates PID namespaces, how Docker containers obtain their own PID namespaces using CLONE_NEWPID, the internal kernel structures involved, and how processes view their PID inside a container.

LinuxPID namespaceProcess Management

0 likes · 13 min read

Understanding Linux PID Namespace Creation and Allocation in Containers

Liangxu Linux

Mar 16, 2022 · Fundamentals

Why Does Linux Show “Out of Memory” When PID Allocation Fails?

A Linux server repeatedly reports “fork: cannot allocate memory” not because RAM is exhausted but due to excessive Java threads causing PID allocation failures, and the kernel mistakenly maps those failures to the ENOMEM error code.

ENOMEMKernelPID namespace

0 likes · 12 min read

Why Does Linux Show “Out of Memory” When PID Allocation Fails?

Ops Development Stories

Sep 14, 2021 · Fundamentals

Understanding Linux Process States and Managing Zombies in Containers

This article explains the classic three‑ and five‑state process models, Linux task_struct states, orphan and zombie processes, and how Docker and Kubernetes handle process IDs, providing practical solutions to prevent and clean up zombie processes in container environments.

DockerKubernetesLinux

0 likes · 17 min read

Understanding Linux Process States and Managing Zombies in Containers