TLDR
Cgroups is a Linux kernel mechanism that allows you to place processes in hierarchical groups for which the use of system resources can be limited. There are two versions of cgroup: v1 and v2. The root cgroup (root) contains the number of CPUs * 1024 shares and inherits child cgroups in proportion to their CPU shares. With cgroups v1, there are special memory.min and memory.low controllers. Exclusively allocated memory for the container, which no one else can use. Applications can be configured to use the container's quotas rather than all the resources available on the Kubernetes node.via the TL;DR App
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