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This page lists the three fields and says what Kraft does when a limit cannot be enforced or a process is killed for memory.",[535,536,542],"pre",{"className":537,"code":538,"filename":539,"language":540,"meta":541,"style":541},"language-yaml shiki shiki-themes github-light-high-contrast github-light-high-contrast github-dark-high-contrast","repos:\n  - path: \u002Fhome\u002Fyou\u002Fcode\u002Fmy-service\n    sandbox:\n      kind: docker\n      image: ghcr.io\u002Facme\u002Fagent:1\n      resources: {cpu: 2, memory: 4g, pids: 512}\n      network:\n        runtime: {allow: [api.github.com]}\n","config\u002Frepos.yaml","yaml","",[530,543,544,557,573,581,592,603,645,653],{"__ignoreMap":541},[545,546,549,553],"span",{"class":547,"line":548},"line",1,[545,550,552],{"class":551},"sb7M8","repos",[545,554,556],{"class":555},"s7iLA",":\n",[545,558,560,563,566,569],{"class":547,"line":559},2,[545,561,562],{"class":555},"  - ",[545,564,565],{"class":551},"path",[545,567,568],{"class":555},": ",[545,570,572],{"class":571},"semJd","\u002Fhome\u002Fyou\u002Fcode\u002Fmy-service\n",[545,574,576,579],{"class":547,"line":575},3,[545,577,578],{"class":551},"    sandbox",[545,580,556],{"class":555},[545,582,584,587,589],{"class":547,"line":583},4,[545,585,586],{"class":551},"      kind",[545,588,568],{"class":555},[545,590,591],{"class":571},"docker\n",[545,593,595,598,600],{"class":547,"line":594},5,[545,596,597],{"class":551},"      image",[545,599,568],{"class":555},[545,601,602],{"class":571},"ghcr.io\u002Facme\u002Fagent:1\n",[545,604,606,609,612,615,617,621,624,627,629,632,634,637,639,642],{"class":547,"line":605},6,[545,607,608],{"class":551},"      resources",[545,610,611],{"class":555},": {",[545,613,614],{"class":551},"cpu",[545,616,568],{"class":555},[545,618,620],{"class":619},"ssYy9","2",[545,622,623],{"class":555},", ",[545,625,626],{"class":551},"memory",[545,628,568],{"class":555},[545,630,631],{"class":571},"4g",[545,633,623],{"class":555},[545,635,636],{"class":551},"pids",[545,638,568],{"class":555},[545,640,641],{"class":619},"512",[545,643,644],{"class":555},"}\n",[545,646,648,651],{"class":547,"line":647},7,[545,649,650],{"class":551},"      network",[545,652,556],{"class":555},[545,654,656,659,661,664,667,670],{"class":547,"line":655},8,[545,657,658],{"class":551},"        runtime",[545,660,611],{"class":555},[545,662,663],{"class":551},"allow",[545,665,666],{"class":555},": [",[545,668,669],{"class":571},"api.github.com",[545,671,672],{"class":555},"]}\n",[674,675,676,695],"table",{},[677,678,679],"thead",{},[680,681,682,686,689,692],"tr",{},[683,684,685],"th",{},"Field",[683,687,688],{},"Type",[683,690,691],{},"Default",[683,693,694],{},"Meaning",[696,697,698,726,763],"tbody",{},[680,699,700,705,708,711],{},[701,702,703],"td",{},[530,704,614],{},[701,706,707],{},"number",[701,709,710],{},"unset",[701,712,713,714,717,718,721,722,725],{},"CPUs the container may use (",[530,715,716],{},"--cpus","), fractions allowed: ",[530,719,720],{},"0.5",", at least ",[530,723,724],{},"0.01",".",[680,727,728,732,735,737],{},[701,729,730],{},[530,731,626],{},[701,733,734],{},"string",[701,736,710],{},[701,738,739,740,623,743,623,746,749,750,753,754,757,758,725],{},"A hard memory limit: a whole number with an optional unit ",[530,741,742],{},"b",[530,744,745],{},"k",[530,747,748],{},"m"," or ",[530,751,752],{},"g"," (binary, as Docker reads them), at least ",[530,755,756],{},"6m",". See ",[759,760,762],"a",{"href":761},"#memory-and-swap","Memory and swap",[680,764,765,769,772,777],{},[701,766,767],{},[530,768,636],{},[701,770,771],{},"integer",[701,773,774],{},[530,775,776],{},"4096",[701,778,779,780,783,784,725],{},"Processes and threads at once (",[530,781,782],{},"--pids-limit","), which bounds a fork bomb. At least ",[530,785,786],{},"1",[788,789,762],"h2",{"id":790},"memory-and-swap",[526,792,793,794,797,798,725],{},"Swap is held to the same limit (",[530,795,796],{},"--memory-swap",") wherever the runtime can limit swap. Where it cannot, the container may swap as much again, and doctor says ",[530,799,800],{},"memory (swap unbounded)",[788,802,804],{"id":803},"how-the-limits-bind","How the limits bind",[526,806,807,808,811,812,814],{},"The limits bind every sandboxed launch of the item, its setup command included, and they are part of the sandbox: a chain, node or task cannot loosen, tighten or drop them. ",[530,809,810],{},"resources: {}"," sets none, and is the same sandbox as no ",[530,813,532],{}," at all.",[788,816,818],{"id":817},"when-a-limit-cannot-be-enforced","When a limit cannot be enforced",[526,820,821],{},"A limit is applied or the task does not start. Two runtimes would otherwise drop a limit silently:",[823,824,825,829],"ul",{},[826,827,828],"li",{},"Docker runs a container without a limit whose cgroup controller is missing, with only a warning.",[826,830,831],{},"Rootless Podman on cgroup v1 ignores every limit.",[526,833,834,835,838],{},"Kraft therefore asks the runtime what it can enforce (Docker's ",[530,836,837],{},"info",", Podman's cgroup controllers). A task that sets a limit the runtime cannot enforce stops as a configuration error that names the limit.",[526,840,841,842,845,846,849],{},"The fix is cgroup v2 and, for a rootless runtime, delegating the controllers to your user (systemd ",[530,843,844],{},"Delegate=cpu memory pids"," for ",[530,847,848],{},"user@.service",").",[526,851,852,853,855,856,858],{},"A runtime whose ",[530,854,837],{}," gives no answer Kraft can read (a daemon still starting) enforces nothing as far as Kraft knows. A task that sets a limit stops, and the next launch asks again. The default ",[530,857,636],{}," is left out, never refused, where the runtime cannot limit processes.",[526,860,861,864],{},[530,862,863],{},"kraft admin doctor"," names the limits the runtime enforces on each sandboxed repository's row, and fails a row whose limits it cannot.",[788,866,868],{"id":867},"out-of-memory","Out of memory",[526,870,871],{},"A session container is kept after it exits, so Kraft can ask the runtime whether the memory limit killed it, then removes it by name.",[823,873,874,881],{},[826,875,876,877,880],{},"The container has no log of its own (",[530,878,879],{},"--log-driver=none","); Kraft reads the output as it runs.",[826,882,883,884,887,888,891],{},"The ",[530,885,886],{},"docker run"," client runs in a directory of Kraft's under ",[530,889,890],{},"$KRAFT_HOME\u002Frun\u002Fsandbox-client\u002F",", never the worktree.",[526,893,894,895,898,899,902,903,907],{},"When a process in the sandbox was killed by its memory limit, Kraft records a ",[530,896,897],{},"sandbox_oom_killed"," event (",[530,900,901],{},"{session_id, memory, confirmed}","). The item stops and waits for you as a configuration error naming the limit: the same limit would kill a retry the same way, so no ",[759,904,906],{"href":905},"\u002Fconcepts\u002Fvocabulary#fix-loop","fix loop"," runs. A session that still reported a result of its own (something it ran was killed and it got past it) keeps that result, with the event recorded.",[526,909,910,911,914],{},"A kill is confirmed by the runtime's own word: Docker's out-of-memory flag, and on Podman also the ",[530,912,913],{},"oom"," file its conmon writes where the client runs, since Podman on cgroup v1 never sets the flag. The runtime can set its flag a moment after the container exits, so for a container that exited 137 under a memory limit Kraft asks again for up to two seconds.",[526,916,917,918,924],{},"Docker on cgroup v2 can drop the flag altogether (",[759,919,923],{"href":920,"rel":921},"https:\u002F\u002Fgithub.com\u002Fmoby\u002Fmoby\u002Fissues\u002F41929",[922],"nofollow","moby#41929","). Kraft counts a container as an unconfirmed kill when all three hold:",[823,926,927,930,933],{},[826,928,929],{},"it exited 137 under a memory limit",[826,931,932],{},"Kraft did not stop it itself (a pause, a time cap, a cancel)",[826,934,935],{},"the flag is still missing after those two seconds",[526,937,938,939,942],{},"The event then has ",[530,940,941],{},"confirmed: false",", and the stop says the runtime did not confirm it was the limit.",[526,944,945],{},"Exit 137 from a container with no memory limit is never counted. A setup command the limit killed stops the item the same way.",[788,947,949],{"id":948},"related","Related",[823,951,952,957,962],{},[826,953,954,956],{},[759,955,346],{"href":347},": what else reaches the container.",[826,958,959,961],{},[759,960,372],{"href":373},": how Kraft asks the runtime what it can enforce.",[826,963,964,966],{},[759,965,356],{"href":357},": how a sandboxed worker reaches Kraft.",[968,969,970],"style",{},"html pre.shiki code .sb7M8, html code.shiki .sb7M8{--shiki-light:#024C1A;--shiki-default:#024C1A;--shiki-dark:#72F088}html pre.shiki code .s7iLA, html code.shiki .s7iLA{--shiki-light:#0E1116;--shiki-default:#0E1116;--shiki-dark:#F0F3F6}html pre.shiki code .semJd, html code.shiki .semJd{--shiki-light:#032563;--shiki-default:#032563;--shiki-dark:#ADDCFF}html pre.shiki code .ssYy9, html code.shiki .ssYy9{--shiki-light:#023B95;--shiki-default:#023B95;--shiki-dark:#91CBFF}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":541,"searchDepth":559,"depth":559,"links":972},[973,974,975,976,977],{"id":790,"depth":559,"text":762},{"id":803,"depth":559,"text":804},{"id":817,"depth":559,"text":818},{"id":867,"depth":559,"text":868},{"id":948,"depth":559,"text":949},"The CPU, memory and process limits a sandbox sets on its container, when a limit cannot be enforced, and what Kraft does when a memory limit kills a process.","md",null,{},true,{"title":352,"description":978},"wRfZaWTsij3it07PEXkh8ZMHU3JSAxoFOSHt9Xr0oDE",[986,988],{"title":10,"path":347,"stem":348,"description":987,"children":-1},"The sandbox key of repos.yaml, what reaches a sandboxed worker's container, and how its home, credentials, image and tool policy are handled.",{"title":356,"path":357,"stem":358,"description":989,"children":-1},"How a sandboxed worker reaches Kraft through a network policy's channel, which verbs it has there, and what is refused without one.",1791801180357]