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In contrast to the previous O(1) scheduler used in older Linux 2.6 kernels, which maintained and switched run queues of active and expired tasks, the CFS scheduler implementation is based on per-CPU run queues, whose nodes are time-ordered schedulable entities that are kept sorted by red–black trees. The CFS does away with the old notion of ...
cgroups (abbreviated from control groups) is a Linux kernel feature that limits, accounts for, and isolates the resource usage (CPU, memory, disk I/O, etc. [1]) of a collection of processes. Engineers at Google started the work on this feature in 2006 under the name "process containers". [ 2 ]
systemd not only uses cgroups, but also augments them with systemd-nspawn and machinectl, two utility programs that facilitate the creation and management of Linux containers. [45] Since version 205, systemd also offers ControlGroupInterface, which is an API to the Linux kernel cgroups. [ 46 ]
Each container is a separate entity, and behaves largely as a physical server would. Each has its own: Files System libraries, applications, virtualized /proc and /sys, virtualized locks, etc. Users and groups Each container has its own root user, as well as other users and groups. Process tree A container only sees its own processes (starting ...
Container clusters need to be managed. This includes functionality to create a cluster, to upgrade the software or repair it, balance the load between existing instances, scale by starting or stopping instances to adapt to the number of users, to log activities and monitor produced logs or the application itself by querying sensors.
The startup function startup_32() for the kernel (also called the swapper or process 0) establishes memory management (paging tables and memory paging), detects the type of CPU and any additional functionality such as floating point capabilities, and then switches to non-architecture specific Linux kernel functionality via a call to start ...
The TurnKey Linux Virtual Appliance Library is a free open-source software project which develops a range of Debian-based pre-packaged server software appliances (also called virtual appliances). Turnkey appliances can be deployed as a virtual machine (a range of hypervisors are supported), in cloud computing services such as Amazon Web ...
LXD is an alternative Linux container manager, written in Go. It is built on top of LXC and aims to provide a better user experience. [13] It is a container hypervisor providing an API to manage LXC containers. [14] The LXD project was started in 2015 and was sponsored from the start by Canonical Ltd., the company behind Ubuntu. On 4 July 2023 ...