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OS-level virtualization

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490:(CoW) mechanisms. (Most commonly, a standard file system is shared between partitions, and those partitions that change the files automatically create their own copies.) This is easier to back up, more space-efficient and simpler to cache than the block-level copy-on-write schemes common on whole-system virtualizers. Whole-system virtualizers, however, can work with non-native file systems and create and roll back snapshots of the entire system state. 36: 432:, different distributions are fine, but other operating systems such as Windows cannot be hosted. Operating systems using variable input systematics are subject to limitations within the virtualized architecture. Adaptation methods including cloud-server relay analytics maintain the OS-level virtual environment within these applications. 339:
all that is available. Several containers can be created on each operating system, to each of which a subset of the computer's resources is allocated. Each container may contain any number of computer programs. These programs may run concurrently or separately, and may even interact with one another.
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With operating-system-virtualization, or containerization, it is possible to run programs within containers, to which only parts of these resources are allocated. A program expecting to see the whole computer, once run inside a container, can only see the allocated resources and believes them to be
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Other typical scenarios include separating several programs to separate containers for improved security, hardware independence, and added resource management features. The improved security provided by the use of a chroot mechanism, however, is not perfect. Operating-system-level virtualization
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in the context in which it runs. The operating system may also hide those resources, so that when the computer program enumerates them, they do not appear in the enumeration results. Nevertheless, from a programming point of view, the computer program has interacted with those resources and the
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environments, where it is useful for securely allocating finite hardware resources among a large number of mutually-distrusting users. System administrators may also use it for consolidating server hardware by moving services on separate hosts into containers on the one server.
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A total of 14 user capabilities are considered safe within a container. The rest may cannot be granted to processes within that container without allowing that process to potentially interfere with things outside that
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Operating-system-level virtualization is not as flexible as other virtualization approaches since it cannot host a guest operating system different from the host one, or a different guest kernel. For example, with
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LXC now has support for user namespaces. LXC is no longer running as root so even if an attacker manages to escape the container, he'd find himself having the privileges of a regular user on the host.
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Each container can have its own IP addresses, firewall rules, routing tables and so on. Three different networking schemes are possible: route-based, bridge-based, and assigning a real network device (
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There are many other OS-level virtualization systems such as: Linux OpenVZ, Linux-VServer, FreeBSD Jails, AIX Workload Partitions (WPARs), HP-UX Containers (SRP), Solaris Containers, among others.
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features to limit the impact of one container's activities on other containers. Linux containers are all based on the virtualization, isolation, and resource management mechanisms provided by the
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Available since Linux kernel 2.6.18-028stable021. Implementation is based on CFQ disk I/O scheduler, but it is a two-level schema, so I/O priority is not per-process, but rather per-container.
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On ordinary operating systems for personal computers, a computer program can see (even though it might not be able to access) all the system's resources. They include:
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mechanism, which changes the apparent root folder for the current running process and its children. In addition to isolation mechanisms, the kernel often provides
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Non-global zones are restricted so they may not affect other zones via a capability-limiting approach. The global zone may administer the non-global zones.
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Oracle Solaris 11.1 administration, Oracle Solaris zones, Oracle Solaris 10 zones and resource management E29024.pdf, pp. 356–360. Available
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The operating system may be able to allow or deny access to such resources based on which program requests them and the
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inside "lx" zones. However, in 2010 Linux branded zones were removed from Solaris; in 2014 they were reintroduced in
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or 9 version in a Solaris 10 host. Linux branded zones (referred to as "lx" branded zones) are also available on
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and support for the execution of Linux applications; additionally, Solaris provides utilities needed to install
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Disk quotas per container are possible when using separate partitions for each container with the help of
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Root user can easily escape from chroot. Chroot was never supposed to be used as a security mechanism.
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running on an ordinary operating system can see all resources (connected devices, files and folders,
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feature, which provides the ability to run an environment within a container that emulates an older
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operating systems, this feature can be seen as an advanced implementation of the standard
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most commonly refers to OS-level virtualization, it is sometimes used to refer to fuller
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Bottlerocket is a Linux-based open-source operating system that is purpose-built by
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because programs in OS-level virtual partitions use the operating system's normal
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Huang, D. (2015). "Experiences in using os-level virtualization for block I/O".
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Check the "allow.quotas" option and the "Jails and file systems" section on the
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Each container may have root access without possibly affecting other containers.
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Virtualization and containerization of application infrastructure: A comparison
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can only see the container's contents and devices assigned to the container.
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Starting in Solaris 11.3 Beta, Solaris Kernel Zones may use live migration.
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Operating-system-level virtualization usually imposes less overhead than
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Operating system paradigm allowing multiple isolated user space instances
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Kurtzer, Gregory M.; Sochat, Vanessa; Bauer, Michael W. (May 11, 2017).
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Only when top level is a KVM zone (illumos) or a kz zone (Oracle).
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operating in varying degrees of concert with the host OS, such as
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is an open-source Linux distribution that is purpose-built by
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for running containers on virtual machines or bare metal hosts
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Data that can be read or written, such as files, folders and
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partially overcomes the limitation described above with its
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A short intro to three different virtualization techniques
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Network virtualization and resource control (Crossbow) FAQ
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Operating-system-level virtualization is commonly used in
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Hardware capabilities that can be employed, such as the
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Proceedings of the 10th Parallel Data Storage Workshop
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Cold migration (shutdown-move-restart) is implemented.
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Docker containers can run inside Virtuozzo containers.
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Networking is based on isolation, not virtualization.
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operating system has managed an act of interaction.
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Solaris network virtualization and resource control
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Docker containers can run inside OpenVZ containers.
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Unsourced material may be challenged and removed. 2872:Rootless containers with Podman and fuse-overlayfs 2508:Jails were first introduced in FreeBSD 4.0 in 2000 1978:Korff, Yanek; Hope, Paco; Potter, Bruce (2005). 1686:scheduler, there is a separate queue per guest. 3014:Comparison of platform virtualization software 1694: 1692: 1543:, a set of container tools used on HPC systems 2988: 2819:"CoreOS is building a container runtime, rkt" 2521:"Hierarchical resource limits - FreeBSD Wiki" 387:interface and do not need to be subjected to 8: 3697:Generic Network Virtualization Encapsulation 2959:, June 22, 2015, by Mathijs Jeroen Scheepers 2885:"Overview — Charliecloud 0.25 documentation" 2668: 2666: 2216:"LXC 1.0: Security features [6/10]" 1517:Linux containers not listed above include: 548:Partition checkpointing and live migration 3376: 3167: 3032: 2995: 2981: 2973: 2693:DragonFly miscellaneous information manual 2679:DragonFly miscellaneous information manual 2600:"3.5. Limiting your program's environment" 2122:"3.5. Limiting your program's environment" 1789:Available since version 4.0, January 2008. 1733:I/O rate limiting is supported when using 497: 371:of containers between nodes in a cluster. 147:allows the existence of multiple isolated 2310: 2300: 2176:"Get started with Docker desktop for Mac" 120:Learn how and when to remove this message 2644: 2642: 486:Some implementations provide file-level 2658:treats the disk image as copy-on-write. 1889: 1663: 287:Timeline of virtualization technologies 2750:"Live application mobility in AIX 6.1" 1981:Mastering FreeBSD and OpenBSD security 1678: 1676: 3351:System Center Virtual Machine Manager 1754: 1752: 342:Containerization has similarities to 7: 3664:Distributed Overlay Virtual Ethernet 510:Actively developed since or between 58:adding citations to reliable sources 2214:Graber, Stéphane (1 January 2014). 3075:LDoms / Oracle VM Server for SPARC 2258:"SIF — Containing your containers" 25: 3730:List of computer system emulators 3631:Symantec Workspace Virtualization 2940:An introduction to virtualization 2398:OpenVZ Virtuozzo Containers Wiki 2366:OpenVZ Virtuozzo Containers Wiki 2336:"Comparison on OpenVZ wiki page" 1524:, an alternative wrapper around 474:Solaris fork, supporting 32-bit 34: 2362:"I/O priorities for containers" 659:Only in experimental mode with 281:containers. For an overview of 45:needs additional citations for 2969:, May 28, 2015, by Josh Berkus 2963:Containers and persistent data 2714:DragonFly On-Line Manual Pages 2650:"vkd(4) — Virtual kernel disc" 2523:. Wiki.freebsd.org. 2012-10-27 1621:Sandbox (software development) 318:it can interact with, such as 1: 2673:Sascha Wildner (2007-01-08). 2096:Bryan Cantrill (2014-09-28). 1653:Virtual resource partitioning 1611:Portable application creators 391:or be run in an intermediate 367:can also be used for dynamic 3462:Virtual kernel architectures 2302:10.1371/journal.pone.0177459 3754:Operating system technology 2874:, CERN workshop, 2019-06-04 568:Varies by operating system 363:implementations capable of 3790: 1897:Hogg, Scott (2014-05-26). 512: 344:application virtualization 305:and the network connection 3749:Operating system security 3722: 3276:Parallels Desktop for Mac 3011: 2547:. usenix.org. 2003-06-13. 1616:Open Container Initiative 551:Root privilege isolation 509: 506: 503: 500: 69:"OS-level virtualization" 3281:Parallels Server for Mac 3261:Microsoft Virtual Server 456:Red Hat Enterprise Linux 167:, HP-UX SRP Containers, 3686:Virtual security switch 3626:Remote Desktop Services 3578:Remote Desktop Services 3573:Citrix Virtual Desktops 3488:Related kernel features 2804:Red Hat Customer portal 2194:"Paper - Linux-VServer" 2015:10.1145/2834976.2834982 1585:Container orchestration 185:virtual private servers 133:OS-level virtualization 3769:Linux containerization 3691:Virtual Extensible LAN 3431:Application containers 3392:iCore Virtual Accounts 2441:"Our ZFS I/O throttle" 1878:Available since TL 02. 1647:Virtual private server 1262:iCore Virtual Accounts 545:Nested virtualization 518:File system isolation 143:paradigm in which the 3774:Linux kernel features 3266:Parallels Workstation 3128:VMware Infrastructure 1867:FreeBSD jail man page 151:instances, including 2180:Docker documentation 1907:. Network world, Inc 1631:Serverless computing 1222:proprietary software 197:virtual environments 54:improve this article 3606:Citrix Virtual Apps 3568:Citrix Virtual Apps 3422:Workload Partitions 3233:Virtual DOS machine 2853:linuxcontainers.org 2779:www.freedesktop.org 2629:BSD cross reference 2334:Bronnikov, Sergey. 2293:2017PLoSO..1277459K 2182:. December 6, 2019. 1554:Amazon Web Services 687:Windows Server 2016 679:(security context) 464:Linux distributions 381:full virtualization 248:resource-management 3412:Solaris Containers 3321:VMware Workstation 3228:Windows on Windows 2945:2019-11-28 at the 2459:2008-06-01 at the 2380:"Docker inside CT" 2164:. 9 February 2023. 2076:Oracle Corporation 2051:Oracle Corporation 2009:. pp. 13–18. 1642:Storage hypervisor 1477:Apache license 2.0 986:Solaris Containers 742:Apache license 2.0 625:Apache license 2.0 565:operating systems 542:Network isolation 531:I/O rate limiting 409:paravirtualization 265:Although the word 181:Solaris Containers 161:Solaris Containers 18:Software container 3736: 3735: 3726:List of emulators 3554: 3553: 3364: 3363: 3334: 3333: 3188:Cooperative Linux 3080:Logical partition 2910:katacontainers.io 2559:"VPS for FreeBSD" 2491:within an archive 2198:linux-vserver.org 1820:for more details. 1762:) to a container. 1626:Separation kernel 1515: 1514: 504:Operating system 326:, scanner, or fax 130: 129: 122: 104: 16:(Redirected from 3781: 3402:Linux Containers 3377: 3168: 3033: 2997: 2990: 2983: 2974: 2928: 2927: 2920: 2914: 2913: 2902: 2896: 2895: 2893: 2891: 2881: 2875: 2869: 2863: 2862: 2860: 2859: 2845: 2839: 2838: 2836: 2834: 2825:. Archived from 2814: 2808: 2807: 2796: 2783: 2782: 2775:"systemd-nspawn" 2771: 2758: 2757: 2746: 2740: 2739: 2728: 2722: 2721: 2706: 2700: 2697: 2686: 2670: 2661: 2660: 2646: 2637: 2636: 2617: 2611: 2610: 2608: 2607: 2596: 2590: 2589: 2587: 2586: 2581:. 31 August 2012 2575: 2569: 2568: 2566: 2565: 2555: 2549: 2548: 2546: 2538: 2532: 2531: 2529: 2528: 2517: 2511: 2510: 2500: 2494: 2487: 2481: 2480: 2469: 2463: 2451: 2445: 2444: 2439:Pijewski, Bill. 2436: 2430: 2429: 2422: 2416: 2415: 2408: 2402: 2401: 2390: 2384: 2383: 2376: 2370: 2369: 2358: 2352: 2351: 2349: 2347: 2331: 2325: 2324: 2314: 2304: 2272: 2266: 2265: 2264:. 14 March 2018. 2254: 2248: 2247: 2236: 2230: 2229: 2224: 2222: 2211: 2202: 2201: 2190: 2184: 2183: 2172: 2166: 2165: 2154: 2148: 2147: 2136: 2130: 2129: 2118: 2112: 2111: 2109: 2108: 2093: 2087: 2086: 2084: 2083: 2068: 2062: 2061: 2059: 2058: 2043: 2037: 2036: 2002: 1996: 1995: 1975: 1969: 1968: 1966: 1965: 1950: 1944: 1943: 1941: 1939: 1934: 1925: 1919: 1918: 1913: 1912: 1894: 1879: 1876: 1870: 1863: 1857: 1854: 1848: 1845: 1839: 1836: 1830: 1827: 1821: 1814: 1808: 1807:Yes with illumos 1805: 1799: 1796: 1790: 1787: 1781: 1778: 1772: 1769: 1763: 1756: 1747: 1744: 1738: 1731: 1725: 1718: 1712: 1708: 1699: 1696: 1687: 1680: 1671: 1668: 1601:Linux namespaces 1549:MicroVM Platform 1481:2014–2018 1173:2006–2009 670: 644: 498: 285:since 1960, see 271:virtual machines 256:Linux namespaces 225:computer program 137:operating system 125: 118: 114: 111: 105: 103: 62: 38: 30: 21: 3789: 3788: 3784: 3783: 3782: 3780: 3779: 3778: 3739: 3738: 3737: 3732: 3718: 3702: 3650: 3621:Microsoft App-V 3587: 3550: 3524: 3483: 3474:User-mode Linux 3457: 3426: 3371: 3360: 3330: 3244: 3159: 3024: 3016: 3007: 3001: 2947:Wayback Machine 2936: 2931: 2922: 2921: 2917: 2904: 2903: 2899: 2889: 2887: 2883: 2882: 2878: 2870: 2866: 2857: 2855: 2847: 2846: 2842: 2832: 2830: 2816: 2815: 2811: 2798: 2797: 2786: 2773: 2772: 2761: 2756:. June 3, 2008. 2748: 2747: 2743: 2738:. 21 July 2011. 2730: 2729: 2725: 2708: 2707: 2703: 2689: 2672: 2671: 2664: 2648: 2647: 2640: 2625:"sys/vkernel.h" 2619: 2618: 2614: 2605: 2603: 2598: 2597: 2593: 2584: 2582: 2577: 2576: 2572: 2563: 2561: 2557: 2556: 2552: 2544: 2540: 2539: 2535: 2526: 2524: 2519: 2518: 2514: 2502: 2501: 2497: 2488: 2484: 2477:docs.oracle.com 2471: 2470: 2466: 2461:Wayback Machine 2452: 2448: 2438: 2437: 2433: 2424: 2423: 2419: 2410: 2409: 2405: 2392: 2391: 2387: 2378: 2377: 2373: 2360: 2359: 2355: 2345: 2343: 2333: 2332: 2328: 2287:(5): e0177459. 2274: 2273: 2269: 2256: 2255: 2251: 2238: 2237: 2233: 2220: 2218: 2213: 2212: 2205: 2192: 2191: 2187: 2174: 2173: 2169: 2156: 2155: 2151: 2138: 2137: 2133: 2120: 2119: 2115: 2106: 2104: 2095: 2094: 2090: 2081: 2079: 2070: 2069: 2065: 2056: 2054: 2045: 2044: 2040: 2025: 2004: 2003: 1999: 1992: 1977: 1976: 1972: 1963: 1961: 1952: 1951: 1947: 1937: 1935: 1932: 1927: 1926: 1922: 1910: 1908: 1896: 1895: 1891: 1887: 1882: 1877: 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3563: 3561: 3557: 3547: 3544: 3542: 3539: 3537: 3534: 3533: 3531: 3529:Orchestration 3527: 3521: 3518: 3516: 3513: 3511: 3508: 3506: 3503: 3501: 3498: 3496: 3493: 3492: 3490: 3486: 3480: 3477: 3475: 3472: 3470: 3467: 3466: 3464: 3460: 3454: 3451: 3449: 3446: 3444: 3441: 3439: 3436: 3435: 3433: 3429: 3423: 3420: 3418: 3415: 3413: 3410: 3408: 3405: 3403: 3400: 3398: 3397:Linux-VServer 3395: 3393: 3390: 3388: 3385: 3384: 3382: 3380:OS containers 3378: 3375: 3373: 3367: 3357: 3354: 3352: 3349: 3347: 3344: 3343: 3341: 3337: 3326: 3322: 3319: 3317: 3316:VMware Server 3314: 3312: 3311:VMware Fusion 3309: 3307: 3304: 3302: 3299: 3297: 3294: 3292: 3289: 3287: 3284: 3282: 3279: 3277: 3274: 3271: 3267: 3264: 3262: 3259: 3257: 3254: 3253: 3251: 3247: 3241: 3238: 3234: 3231: 3230: 3229: 3226: 3224: 3221: 3219: 3216: 3214: 3211: 3209: 3206: 3204: 3201: 3199: 3196: 3194: 3191: 3189: 3186: 3184: 3181: 3179: 3176: 3175: 3173: 3169: 3166: 3162: 3156: 3153: 3151: 3148: 3144: 3141: 3139: 3136: 3135: 3134: 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Freebsd.org 2601: 2595: 2592: 2580: 2574: 2571: 2560: 2554: 2551: 2543: 2537: 2534: 2522: 2516: 2513: 2509: 2505: 2499: 2496: 2492: 2486: 2483: 2478: 2474: 2468: 2465: 2462: 2458: 2455: 2450: 2447: 2442: 2435: 2432: 2427: 2421: 2418: 2413: 2407: 2404: 2399: 2395: 2389: 2386: 2381: 2375: 2372: 2367: 2363: 2357: 2354: 2341: 2337: 2330: 2327: 2322: 2318: 2313: 2308: 2303: 2298: 2294: 2290: 2286: 2282: 2278: 2271: 2268: 2263: 2262:www.sylabs.io 2259: 2253: 2250: 2245: 2241: 2235: 2232: 2228: 2217: 2210: 2208: 2204: 2199: 2195: 2189: 2186: 2181: 2177: 2171: 2168: 2163: 2159: 2153: 2150: 2145: 2141: 2135: 2132: 2127: 2123: 2117: 2114: 2103: 2099: 2092: 2089: 2077: 2073: 2067: 2064: 2052: 2048: 2042: 2039: 2034: 2030: 2026: 2024:9781450340083 2020: 2016: 2012: 2008: 2001: 1998: 1993: 1987: 1983: 1982: 1974: 1971: 1959: 1955: 1949: 1946: 1931: 1928:Rami, Rosen. 1924: 1921: 1917: 1906: 1905: 1904:Network World 1900: 1893: 1890: 1884: 1875: 1872: 1868: 1862: 1859: 1853: 1850: 1844: 1841: 1835: 1832: 1826: 1823: 1819: 1813: 1810: 1804: 1801: 1795: 1792: 1786: 1783: 1777: 1774: 1768: 1765: 1761: 1755: 1753: 1749: 1743: 1740: 1736: 1730: 1727: 1723: 1717: 1714: 1707: 1705: 1701: 1695: 1693: 1689: 1685: 1679: 1677: 1673: 1667: 1664: 1658: 1654: 1651: 1648: 1645: 1643: 1640: 1637: 1634: 1632: 1629: 1627: 1624: 1622: 1619: 1617: 1614: 1612: 1609: 1607: 1604: 1602: 1599: 1597: 1596:Linux cgroups 1594: 1591: 1588: 1586: 1583: 1581: 1578: 1577: 1573: 1569: 1568:Fedora CoreOS 1565: 1561: 1558: 1555: 1551: 1548: 1545: 1542: 1539: 1536: 1533: 1531: 1528:developed by 1527: 1523: 1520: 1519: 1518: 1510: 1507: 1504: 1501: 1498: 1495: 1492: 1489: 1486: 1483: 1480: 1478: 1475: 1473: 1470: 1467: 1463: 1460: 1459: 1455: 1452: 1449: 1446: 1443: 1440: 1437: 1434: 1431: 1428: 1425: 1423: 1420: 1418: 1415: 1413: 1410: 1409: 1405: 1402: 1399: 1396: 1393: 1390: 1387: 1384: 1381: 1378: 1375: 1373: 1372:GNU LGPLv2.1+ 1370: 1368: 1365: 1363: 1360: 1359: 1355: 1352: 1349: 1346: 1343: 1340: 1337: 1334: 1331: 1328: 1325: 1323: 1320: 1318: 1315: 1313: 1310: 1309: 1305: 1302: 1299: 1296: 1293: 1290: 1287: 1284: 1281: 1278: 1275: 1273: 1270: 1268: 1265: 1263: 1260: 1259: 1255: 1252: 1249: 1246: 1243: 1240: 1237: 1234: 1231: 1228: 1225: 1223: 1220: 1217: 1215: 1212: 1210: 1207: 1206: 1202: 1199: 1196: 1193: 1190: 1187: 1184: 1181: 1178: 1175: 1172: 1170: 1167: 1165: 1161: 1158: 1156: 1153: 1152: 1148: 1145: 1142: 1139: 1136: 1133: 1130: 1127: 1124: 1121: 1118: 1116: 1113: 1111: 1110:DragonFly BSD 1108: 1106: 1103: 1102: 1098: 1095: 1092: 1089: 1086: 1083: 1080: 1077: 1074: 1071: 1068: 1066: 1063: 1061: 1060:DragonFly BSD 1057: 1054: 1052: 1049: 1048: 1044: 1041: 1038: 1035: 1032: 1029: 1026: 1023: 1020: 1017: 1014: 1012: 1007: 1004: 1002: 997: 993: 990: 987: 984: 983: 979: 976: 973: 970: 967: 964: 961: 958: 955: 952: 949: 947: 944: 942: 938: 935: 933: 930: 929: 925: 922: 919: 916: 913: 910: 907: 904: 901: 898: 895: 893: 890: 888: 885: 883: 880: 879: 875: 872: 869: 866: 863: 860: 857: 854: 851: 848: 845: 843: 840: 838: 835: 833: 830: 829: 825: 822: 819: 816: 813: 810: 807: 804: 801: 798: 795: 793: 790: 788: 785: 783: 780: 779: 775: 772: 769: 766: 763: 760: 757: 754: 751: 748: 745: 743: 740: 738: 735: 733: 730: 729: 725: 722: 719: 716: 713: 710: 707: 704: 701: 698: 695: 693: 690: 688: 684: 681: 677: 676:Linux-VServer 674: 673: 666: 664: 662: 658: 655: 652: 649: 646: 640: 638:Not directly 637: 634: 631: 628: 626: 623: 621: 617: 613: 610: 608: 605: 604: 600: 597: 594: 591: 588: 585: 582: 579: 576: 573: 570: 567: 564: 560: 558: 555: 554: 550: 547: 544: 541: 539: 536: 533: 530: 528: 525: 523: 522:Copy on write 520: 517: 516: 499: 493: 491: 489: 488:copy-on-write 481: 479: 477: 476:Linux kernels 473: 469: 465: 461: 458: 3.x or 457: 453: 449: 445: 441: 440:branded zones 437: 433: 431: 422: 420: 418: 414: 410: 406: 402: 398: 394: 390: 386: 382: 374: 372: 370: 366: 360: 357: 349: 347: 345: 340: 336: 333: 325: 321: 317: 313: 311: 307: 304: 300: 299: 298: 292: 290: 288: 284: 280: 276: 272: 268: 263: 261: 257: 253: 249: 245: 241: 236: 234: 230: 226: 222: 218: 214: 210: 209:DragonFly BSD 206: 202: 198: 194: 190: 186: 182: 178: 174: 170: 166: 162: 158: 154: 150: 146: 142: 138: 134: 124: 121: 113: 110:November 2020 102: 99: 95: 92: 88: 85: 81: 78: 74: 71: –  70: 66: 65:Find sources: 59: 55: 49: 48: 43:This article 41: 37: 32: 31: 19: 3681:Open vSwitch 3670:Ethernet VPN 3387:FreeBSD jail 3369: 3356:Virt-manager 3301:Virtual Iron 2918: 2909: 2900: 2888:. 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operating system
virtualization
kernel
user space
LXC
Solaris Containers
WPARs
Docker
Podman
Solaris Containers
OpenVZ
DragonFly BSD
FreeBSD jail
chroot
computer program
network shares
container
Unix-like

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