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OS-level virtualization

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499:(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: 441:, 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. 348:
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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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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environments operating in varying degrees of concert with the host OS, e.g.,
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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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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. 2881:Rootless containers with Podman and fuse-overlayfs 2580: 2517:Jails were first introduced in FreeBSD 4.0 in 2000 2283: 3749: 1987:Korff, Yanek; Hope, Paco; Potter, Bruce (2005). 1986: 1810: 1695:scheduler, there is a separate queue per guest. 3023:Comparison of platform virtualization software 2681: 2628: 2104: 1859: 1832: 1703: 1701: 1552:, a set of container tools used on HPC systems 2997: 2828:"CoreOS is building a container runtime, rkt" 2530:"Hierarchical resource limits - FreeBSD Wiki" 396:interface and do not need to be subjected to 3706:Generic Network Virtualization Encapsulation 2968:, June 22, 2015, by Mathijs Jeroen Scheepers 2894:"Overview — Charliecloud 0.25 documentation" 2677: 2675: 3011: 2413: 2225:"LXC 1.0: Security features [6/10]" 1736: 1698: 1673: 1526:Linux containers not listed above include: 557:Partition checkpointing and live migration 3004: 2990: 2702:DragonFly miscellaneous information manual 2688:DragonFly miscellaneous information manual 2609:"3.5. Limiting your program's environment" 2560: 2131:"3.5. Limiting your program's environment" 1841: 1798:Available since version 4.0, January 2008. 1742:I/O rate limiting is supported when using 380:of containers between nodes in a cluster. 294:in general since 1960 can be found in the 147:allows the existence of multiple isolated 2672: 2622: 2319: 2309: 2185:"Get started with Docker desktop for Mac" 120:Learn how and when to remove this message 2653: 2651: 1819: 495:Some implementations provide file-level 290:containers. A more historic overview of 2667:treats the disk image as copy-on-write. 1850: 14: 3750: 2759:"Live application mobility in AIX 6.1" 2222: 1990:Mastering FreeBSD and OpenBSD security 1749: 1723: 1687: 1685: 296:Timeline of virtualization development 3360:System Center Virtual Machine Manager 2985: 2711: 2648: 2342: 2013: 1763: 1761: 351:Containerization has similarities to 3673:Distributed Overlay Virtual Ethernet 2522: 2447: 1905: 519:Actively developed since or between 58:adding citations to reliable sources 29: 2223:Graber, Stéphane (1 January 2014). 1792: 1682: 24: 3084:LDoms / Oracle VM Server for SPARC 2267:"SIF — Containing your containers" 1758: 502: 25: 3794: 3739:List of computer system emulators 3640:Symantec Workspace Virtualization 2949:An introduction to virtualization 2942: 2825: 2407:OpenVZ Virtuozzo Containers Wiki 2375:OpenVZ Virtuozzo Containers Wiki 2345:"Comparison on OpenVZ wiki page" 1936: 1533:, an alternative wrapper around 1136: 483:Solaris fork, supporting 32-bit 34: 2925: 2907: 2886: 2874: 2850: 2819: 2751: 2733: 2601: 2543: 2505: 2492: 2474: 2456: 2441: 2427: 2395: 2381: 2371:"I/O priorities for containers" 2363: 2336: 2277: 2259: 2241: 2195: 2177: 2159: 2141: 1881: 1868: 668:Only in experimental mode with 45:needs additional citations for 2978:, May 28, 2015, by Josh Berkus 2972:Containers and persistent data 2723:DragonFly On-Line Manual Pages 2659:"vkd(4) — Virtual kernel disc" 2532:. Wiki.freebsd.org. 2012-10-27 2123: 2098: 2073: 2048: 2007: 1980: 1955: 1930: 1899: 1630:Sandbox (software development) 431: 327:it can interact with, such as 13: 1: 2682:Sascha Wildner (2007-01-08). 2105:Bryan Cantrill (2014-09-28). 1893: 1662:Virtual resource partitioning 1620:Portable application creators 400:or be run in an intermediate 376:can also be used for dynamic 3471:Virtual kernel architectures 2311:10.1371/journal.pone.0177459 301: 7: 3763:Operating system technology 2883:, CERN workshop, 2019-06-04 1582: 577:Varies by operating system 383: 372:implementations capable of 10: 3799: 1906:Hogg, Scott (2014-05-26). 521: 490: 353:application virtualization 314:and the network connection 3758:Operating system security 3731: 3715: 3663: 3600: 3567: 3537: 3496: 3470: 3439: 3388: 3377: 3347: 3285:Parallels Desktop for Mac 3257: 3179: 3172: 3044: 3029: 3020: 2556:. usenix.org. 2003-06-13. 1625:Open Container Initiative 560:Root privilege isolation 518: 515: 512: 509: 69:"OS-level virtualization" 3290:Parallels Server for Mac 3270:Microsoft Virtual Server 1667: 465:Red Hat Enterprise Linux 169:, HP-UX SRP Containers, 3695:Virtual security switch 3635:Remote Desktop Services 3587:Remote Desktop Services 3582:Citrix Virtual Desktops 3497:Related kernel features 2813:Red Hat Customer portal 2203:"Paper - Linux-VServer" 2024:10.1145/2834976.2834982 1594:Container orchestration 358: 190:virtual private servers 133:OS-level virtualization 18:OS-level virtualisation 3778:Linux containerization 3700:Virtual Extensible LAN 3440:Application containers 3401:iCore Virtual Accounts 2450:"Our ZFS I/O throttle" 1887:Available since TL 02. 1656:Virtual private server 1271:iCore Virtual Accounts 554:Nested virtualization 527:File system isolation 143:paradigm in which the 3783:Linux kernel features 3275:Parallels Workstation 3137:VMware Infrastructure 1876:FreeBSD jail man page 2189:Docker documentation 1916:. Network world, Inc 1640:Serverless computing 1231:proprietary software 206:virtual environments 54:improve this article 3615:Citrix Virtual Apps 3577:Citrix Virtual Apps 3431:Workload Partitions 3242:Virtual DOS machine 2862:linuxcontainers.org 2788:www.freedesktop.org 2638:BSD cross reference 2343:Bronnikov, Sergey. 2302:2017PLoSO..1277459K 2191:. December 6, 2019. 1563:Amazon Web Services 696:Windows Server 2016 688:(security context) 473:Linux distributions 390:full virtualization 258:resource-management 3421:Solaris Containers 3330:VMware Workstation 3237:Windows on Windows 2954:2019-11-28 at the 2468:2008-06-01 at the 2389:"Docker inside CT" 2173:. 9 February 2023. 2085:Oracle Corporation 2060:Oracle Corporation 2018:. pp. 13–18. 1651:Storage hypervisor 1486:Apache license 2.0 995:Solaris Containers 751:Apache license 2.0 634:Apache license 2.0 574:operating systems 551:Network isolation 540:I/O rate limiting 418:paravirtualization 185:Solaris containers 163:Solaris containers 151:instances, called 3745: 3744: 3735:List of emulators 3563: 3562: 3373: 3372: 3343: 3342: 3197:Cooperative Linux 3089:Logical partition 2919:katacontainers.io 2568:"VPS for FreeBSD" 2500:within an archive 2207:linux-vserver.org 1829:for more details. 1771:) to a container. 1635:Separation kernel 1524: 1523: 513:Operating system 335:, scanner, or fax 130: 129: 122: 104: 16:(Redirected from 3790: 3411:Linux Containers 3386: 3385: 3177: 3176: 3042: 3041: 3006: 2999: 2992: 2983: 2982: 2937: 2936: 2929: 2923: 2922: 2911: 2905: 2904: 2902: 2900: 2890: 2884: 2878: 2872: 2871: 2869: 2868: 2854: 2848: 2847: 2845: 2843: 2834:. Archived from 2823: 2817: 2816: 2805: 2792: 2791: 2784:"systemd-nspawn" 2780: 2767: 2766: 2755: 2749: 2748: 2737: 2731: 2730: 2715: 2709: 2706: 2695: 2679: 2670: 2669: 2655: 2646: 2645: 2626: 2620: 2619: 2617: 2616: 2605: 2599: 2598: 2596: 2595: 2590:. 31 August 2012 2584: 2578: 2577: 2575: 2574: 2564: 2558: 2557: 2555: 2547: 2541: 2540: 2538: 2537: 2526: 2520: 2519: 2509: 2503: 2496: 2490: 2489: 2478: 2472: 2460: 2454: 2453: 2448:Pijewski, Bill. 2445: 2439: 2438: 2431: 2425: 2424: 2417: 2411: 2410: 2399: 2393: 2392: 2385: 2379: 2378: 2367: 2361: 2360: 2358: 2356: 2340: 2334: 2333: 2323: 2313: 2281: 2275: 2274: 2273:. 14 March 2018. 2263: 2257: 2256: 2245: 2239: 2238: 2233: 2231: 2220: 2211: 2210: 2199: 2193: 2192: 2181: 2175: 2174: 2163: 2157: 2156: 2145: 2139: 2138: 2127: 2121: 2120: 2118: 2117: 2102: 2096: 2095: 2093: 2092: 2077: 2071: 2070: 2068: 2067: 2052: 2046: 2045: 2011: 2005: 2004: 1984: 1978: 1977: 1975: 1974: 1959: 1953: 1952: 1950: 1948: 1943: 1934: 1928: 1927: 1922: 1921: 1903: 1888: 1885: 1879: 1872: 1866: 1863: 1857: 1854: 1848: 1845: 1839: 1836: 1830: 1823: 1817: 1816:Yes with illumos 1814: 1808: 1805: 1799: 1796: 1790: 1787: 1781: 1778: 1772: 1765: 1756: 1753: 1747: 1740: 1734: 1727: 1721: 1717: 1708: 1705: 1696: 1689: 1680: 1677: 1610:Linux namespaces 1558:MicroVM Platform 1490:2014–2018 1182:2006–2009 679: 653: 507: 506: 266:Linux namespaces 235:computer program 137:operating system 125: 118: 114: 111: 105: 103: 62: 38: 30: 21: 3798: 3797: 3793: 3792: 3791: 3789: 3788: 3787: 3748: 3747: 3746: 3741: 3727: 3711: 3659: 3630:Microsoft App-V 3596: 3559: 3533: 3492: 3483:User-mode Linux 3466: 3435: 3380: 3369: 3339: 3253: 3168: 3033: 3025: 3016: 3010: 2956:Wayback Machine 2945: 2940: 2931: 2930: 2926: 2913: 2912: 2908: 2898: 2896: 2892: 2891: 2887: 2879: 2875: 2866: 2864: 2856: 2855: 2851: 2841: 2839: 2824: 2820: 2807: 2806: 2795: 2782: 2781: 2770: 2765:. June 3, 2008. 2757: 2756: 2752: 2747:. 21 July 2011. 2739: 2738: 2734: 2717: 2716: 2712: 2698: 2680: 2673: 2657: 2656: 2649: 2634:"sys/vkernel.h" 2627: 2623: 2614: 2612: 2607: 2606: 2602: 2593: 2591: 2586: 2585: 2581: 2572: 2570: 2566: 2565: 2561: 2553: 2549: 2548: 2544: 2535: 2533: 2528: 2527: 2523: 2511: 2510: 2506: 2497: 2493: 2486:docs.oracle.com 2480: 2479: 2475: 2470:Wayback Machine 2461: 2457: 2446: 2442: 2433: 2432: 2428: 2419: 2418: 2414: 2401: 2400: 2396: 2387: 2386: 2382: 2369: 2368: 2364: 2354: 2352: 2341: 2337: 2296:(5): e0177459. 2282: 2278: 2265: 2264: 2260: 2247: 2246: 2242: 2229: 2227: 2221: 2214: 2201: 2200: 2196: 2183: 2182: 2178: 2165: 2164: 2160: 2147: 2146: 2142: 2129: 2128: 2124: 2115: 2113: 2103: 2099: 2090: 2088: 2079: 2078: 2074: 2065: 2063: 2054: 2053: 2049: 2034: 2012: 2008: 2001: 1985: 1981: 1972: 1970: 1961: 1960: 1956: 1946: 1944: 1941: 1935: 1931: 1919: 1917: 1904: 1900: 1896: 1891: 1886: 1882: 1873: 1869: 1864: 1860: 1855: 1851: 1846: 1842: 1837: 1833: 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2671: 2647: 2630:Matthew Dillon 2621: 2600: 2579: 2559: 2542: 2521: 2504: 2491: 2473: 2455: 2440: 2426: 2412: 2394: 2380: 2362: 2335: 2276: 2258: 2253:www.top500.org 2240: 2212: 2194: 2176: 2158: 2140: 2122: 2111:slideshare.net 2097: 2072: 2047: 2032: 2006: 1999: 1979: 1967:aws.amazon.com 1954: 1929: 1897: 1895: 1892: 1890: 1889: 1880: 1867: 1858: 1849: 1840: 1831: 1818: 1809: 1800: 1791: 1782: 1773: 1757: 1748: 1735: 1722: 1709: 1697: 1681: 1671: 1669: 1666: 1665: 1664: 1659: 1653: 1648: 1642: 1637: 1632: 1627: 1622: 1617: 1612: 1607: 1602: 1596: 1591: 1584: 1581: 1580: 1579: 1566: 1559: 1553: 1547: 1541: 1522: 1521: 1518: 1515: 1512: 1509: 1506: 1503: 1500: 1497: 1494: 1491: 1488: 1483: 1478: 1467: 1466: 1463: 1460: 1457: 1454: 1451: 1448: 1445: 1442: 1439: 1436: 1433: 1428: 1423: 1417: 1416: 1413: 1410: 1407: 1404: 1401: 1398: 1395: 1392: 1389: 1386: 1383: 1378: 1373: 1371:systemd-nspawn 1367: 1366: 1363: 1360: 1357: 1354: 1351: 1348: 1345: 1342: 1339: 1336: 1333: 1328: 1323: 1317: 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3538:Orchestration 3536: 3530: 3527: 3525: 3522: 3520: 3517: 3515: 3512: 3510: 3507: 3505: 3502: 3501: 3499: 3495: 3489: 3486: 3484: 3481: 3479: 3476: 3475: 3473: 3469: 3463: 3460: 3458: 3455: 3453: 3450: 3448: 3445: 3444: 3442: 3438: 3432: 3429: 3427: 3424: 3422: 3419: 3417: 3414: 3412: 3409: 3407: 3406:Linux-VServer 3404: 3402: 3399: 3397: 3394: 3393: 3391: 3389:OS containers 3387: 3384: 3382: 3376: 3366: 3363: 3361: 3358: 3356: 3353: 3352: 3350: 3346: 3335: 3331: 3328: 3326: 3325:VMware Server 3323: 3321: 3320:VMware Fusion 3318: 3316: 3313: 3311: 3308: 3306: 3303: 3301: 3298: 3296: 3293: 3291: 3288: 3286: 3283: 3280: 3276: 3273: 3271: 3268: 3266: 3263: 3262: 3260: 3256: 3250: 3247: 3243: 3240: 3239: 3238: 3235: 3233: 3230: 3228: 3225: 3223: 3220: 3218: 3215: 3213: 3210: 3208: 3205: 3203: 3200: 3198: 3195: 3193: 3190: 3188: 3185: 3184: 3182: 3178: 3175: 3171: 3165: 3162: 3160: 3157: 3153: 3150: 3148: 3145: 3144: 3143: 3140: 3138: 3135: 3131: 3128: 3126: 3123: 3122: 3121: 3118: 3116: 3113: 3111: 3108: 3106: 3103: 3101: 3098: 3096: 3093: 3090: 3087: 3085: 3082: 3078: 3075: 3073: 3070: 3069: 3068: 3065: 3063: 3060: 3058: 3055: 3053: 3050: 3049: 3047: 3043: 3040: 3037: 3032: 3028: 3024: 3019: 3014: 3007: 3002: 3000: 2995: 2993: 2988: 2987: 2984: 2977: 2973: 2970: 2967: 2964: 2962: 2959: 2957: 2953: 2950: 2947: 2946: 2934: 2928: 2920: 2916: 2910: 2895: 2889: 2882: 2877: 2863: 2859: 2853: 2838:on 2019-04-01 2837: 2833: 2829: 2826:Polvi, Alex. 2822: 2814: 2810: 2804: 2802: 2800: 2798: 2789: 2785: 2779: 2777: 2775: 2773: 2764: 2760: 2754: 2746: 2742: 2736: 2728: 2727:DragonFly BSD 2724: 2720: 2714: 2704: 2703: 2697: 2696: 2693: 2692:DragonFly BSD 2689: 2685: 2678: 2676: 2668: 2664: 2663:DragonFly BSD 2660: 2654: 2652: 2643: 2642:DragonFly BSD 2639: 2635: 2631: 2625: 2611:. Freebsd.org 2610: 2604: 2589: 2583: 2569: 2563: 2552: 2546: 2531: 2525: 2518: 2514: 2508: 2501: 2495: 2487: 2483: 2477: 2471: 2467: 2464: 2459: 2451: 2444: 2436: 2430: 2422: 2416: 2408: 2404: 2398: 2390: 2384: 2376: 2372: 2366: 2350: 2346: 2339: 2331: 2327: 2322: 2317: 2312: 2307: 2303: 2299: 2295: 2291: 2287: 2280: 2272: 2271:www.sylabs.io 2268: 2262: 2254: 2250: 2244: 2237: 2226: 2219: 2217: 2208: 2204: 2198: 2190: 2186: 2180: 2172: 2168: 2162: 2154: 2150: 2144: 2136: 2132: 2126: 2112: 2108: 2101: 2086: 2082: 2076: 2061: 2057: 2051: 2043: 2039: 2035: 2033:9781450340083 2029: 2025: 2021: 2017: 2010: 2002: 1996: 1992: 1991: 1983: 1968: 1964: 1958: 1940: 1937:Rami, Rosen. 1933: 1926: 1915: 1914: 1913:Network World 1909: 1902: 1898: 1884: 1877: 1871: 1862: 1853: 1844: 1835: 1828: 1822: 1813: 1804: 1795: 1786: 1777: 1770: 1764: 1762: 1752: 1745: 1739: 1732: 1726: 1716: 1714: 1704: 1702: 1694: 1688: 1686: 1676: 1672: 1663: 1660: 1657: 1654: 1652: 1649: 1646: 1643: 1641: 1638: 1636: 1633: 1631: 1628: 1626: 1623: 1621: 1618: 1616: 1613: 1611: 1608: 1606: 1605:Linux cgroups 1603: 1600: 1597: 1595: 1592: 1590: 1587: 1586: 1578: 1577:Fedora CoreOS 1574: 1570: 1567: 1564: 1560: 1557: 1554: 1551: 1548: 1545: 1542: 1540: 1537:developed by 1536: 1532: 1529: 1528: 1527: 1519: 1516: 1513: 1510: 1507: 1504: 1501: 1498: 1495: 1492: 1489: 1487: 1484: 1482: 1479: 1476: 1472: 1469: 1468: 1464: 1461: 1458: 1455: 1452: 1449: 1446: 1443: 1440: 1437: 1434: 1432: 1429: 1427: 1424: 1422: 1419: 1418: 1414: 1411: 1408: 1405: 1402: 1399: 1396: 1393: 1390: 1387: 1384: 1382: 1381:GNU LGPLv2.1+ 1379: 1377: 1374: 1372: 1369: 1368: 1364: 1361: 1358: 1355: 1352: 1349: 1346: 1343: 1340: 1337: 1334: 1332: 1329: 1327: 1324: 1322: 1319: 1318: 1314: 1311: 1308: 1305: 1302: 1299: 1296: 1293: 1290: 1287: 1284: 1282: 1279: 1277: 1274: 1272: 1269: 1268: 1264: 1261: 1258: 1255: 1252: 1249: 1246: 1243: 1240: 1237: 1234: 1232: 1229: 1226: 1224: 1221: 1219: 1216: 1215: 1211: 1208: 1205: 1202: 1199: 1196: 1193: 1190: 1187: 1184: 1181: 1179: 1176: 1174: 1170: 1167: 1165: 1162: 1161: 1157: 1154: 1151: 1148: 1145: 1142: 1139: 1133: 1130: 1127: 1125: 1122: 1120: 1119:DragonFly BSD 1117: 1115: 1112: 1111: 1107: 1104: 1101: 1098: 1095: 1092: 1089: 1086: 1083: 1080: 1077: 1075: 1072: 1070: 1069:DragonFly BSD 1066: 1063: 1061: 1058: 1057: 1053: 1050: 1047: 1044: 1041: 1038: 1035: 1032: 1029: 1026: 1023: 1021: 1016: 1013: 1011: 1006: 1002: 999: 996: 993: 992: 988: 985: 982: 979: 976: 973: 970: 967: 964: 961: 958: 956: 953: 951: 947: 944: 942: 939: 938: 934: 931: 928: 925: 922: 919: 916: 913: 910: 907: 904: 902: 899: 897: 894: 892: 889: 888: 884: 881: 878: 875: 872: 869: 866: 863: 860: 857: 854: 852: 849: 847: 844: 842: 839: 838: 834: 831: 828: 825: 822: 819: 816: 813: 810: 807: 804: 802: 799: 797: 794: 792: 789: 788: 784: 781: 778: 775: 772: 769: 766: 763: 760: 757: 754: 752: 749: 747: 744: 742: 739: 738: 734: 731: 728: 725: 722: 719: 716: 713: 710: 707: 704: 702: 699: 697: 693: 690: 686: 685:Linux-VServer 683: 682: 675: 673: 671: 667: 664: 661: 658: 655: 649: 647:Not directly 646: 643: 640: 637: 635: 632: 630: 626: 622: 619: 617: 614: 613: 609: 606: 603: 600: 597: 594: 591: 588: 585: 582: 579: 576: 573: 569: 567: 564: 563: 559: 556: 553: 550: 548: 545: 542: 539: 537: 534: 532: 531:Copy on write 529: 526: 525: 508: 500: 498: 497:copy-on-write 488: 486: 485:Linux kernels 482: 478: 474: 470: 467: 3.x or 466: 462: 458: 454: 450: 449:branded zones 446: 442: 440: 429: 427: 423: 419: 415: 411: 407: 403: 399: 395: 391: 381: 379: 375: 369: 366: 356: 354: 349: 345: 342: 334: 330: 326: 322: 320: 316: 313: 309: 308: 307: 299: 297: 293: 289: 286: 282: 278: 273: 271: 267: 263: 259: 255: 251: 246: 244: 240: 236: 232: 228: 224: 223: 218: 217:DragonFly BSD 214: 213: 208: 207: 202: 201: 196: 192: 191: 186: 182: 181: 176: 172: 168: 164: 160: 156: 155: 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: 3690:Open vSwitch 3679:Ethernet VPN 3396:FreeBSD jail 3378: 3365:Virt-manager 3310:Virtual Iron 2927: 2918: 2909: 2897:. 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