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20111960
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2013-11-21T03:36:50.090
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2013-12-16T22:19:03.027
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<code>free</code> won't show it as this is enforced via cgroups. Instead on the host (outside the container) you can check using <code>/sysfs</code> and the cgroup memory <pre><code>vagrant@precise64:~$ docker run -m=524288 -d -t busybox sleep 3600 f03a017b174f vagrant@precise64:~$ cat /sys/fs/cgroup/memory/lxc/f03a017b174ff1022e0f46bc1b307658c2d96ffef1dd97e7c1929a4ca61ab80f//memory.limit_in_bytes 524288 </code></pre> To see it run out of memory you can run something that will use more memory than you allocate - eg: <pre><code>docker run -m=524288 -d -p 8000:8000 -t ubuntu:12.10 /usr/bin/python3 -m http.server 8480df1d2d5d vagrant@precise64:~$ docker ps | grep 0f742445f839 vagrant@precise64:~$ docker ps -a | grep 0f742445f839 0f742445f839 ubuntu:12.10 /usr/bin/python3 -m 16 seconds ago Exit 137 blue_pig </code></pre> In <code>dmesg</code> you should see the container and process killed: <pre><code>[ 583.447974] Pid: 1954, comm: python3 Tainted: GF O 3.8.0-33-generic #48~precise1-Ubuntu [ 583.447980] Call Trace: [ 583.447998] [<ffffffff816df13a>] dump_header+0x83/0xbb [ 583.448108] [<ffffffff816df1c7>] oom_kill_process.part.6+0x55/0x2cf [ 583.448124] [<ffffffff81067265>] ? has_ns_capability_noaudit+0x15/0x20 [ 583.448137] [<ffffffff81191cc1>] ? mem_cgroup_iter+0x1b1/0x200 [ 583.448150] [<ffffffff8113893d>] oom_kill_process+0x4d/0x50 [ 583.448171] [<ffffffff816e1cf5>] mem_cgroup_out_of_memory+0x1f6/0x241 [ 583.448187] [<ffffffff816e1e7f>] mem_cgroup_handle_oom+0x13f/0x24a [ 583.448200] [<ffffffff8119000d>] ? mem_cgroup_margin+0xad/0xb0 [ 583.448212] [<ffffffff811949d0>] ? mem_cgroup_charge_common+0xa0/0xa0 [ 583.448224] [<ffffffff81193ff3>] mem_cgroup_do_charge+0x143/0x170 [ 583.448236] [<ffffffff81194125>] __mem_cgroup_try_charge+0x105/0x350 [ 583.448249] [<ffffffff81194987>] mem_cgroup_charge_common+0x57/0xa0 [ 583.448261] [<ffffffff8119517a>] mem_cgroup_newpage_charge+0x2a/0x30 [ 583.448275] [<ffffffff8115b4d3>] do_anonymous_page.isra.35+0xa3/0x2f0 [ 583.448288] [<ffffffff8115f759>] handle_pte_fault+0x209/0x230 [ 583.448301] [<ffffffff81160bb0>] handle_mm_fault+0x2a0/0x3e0 [ 583.448320] [<ffffffff816f844f>] __do_page_fault+0x1af/0x560 [ 583.448341] [<ffffffffa02b0a80>] ? vfsub_read_u+0x30/0x40 [aufs] [ 583.448358] [<ffffffffa02ba3a7>] ? aufs_read+0x107/0x140 [aufs] [ 583.448371] [<ffffffff8119bb50>] ? vfs_read+0xb0/0x180 [ 583.448384] [<ffffffff816f880e>] do_page_fault+0xe/0x10 [ 583.448396] [<ffffffff816f4bd8>] page_fault+0x28/0x30 [ 583.448405] Task in /lxc/0f742445f8397ee7928c56bcd5c05ac29dcc6747c6d1c3bdda80d8e688fae949 killed as a result of limit of /lxc/0f742445f8397ee7928c56bcd5c05ac29dcc6747c6d1c3bdda80d8e688fae949 [ 583.448412] memory: usage 416kB, limit 512kB, failcnt 342 </code></pre>
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1. POLimit memory on a docker container doesn't work
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1. USTomasz Elendt
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1. COthanks now i understand; so the best way is to check on cgroup memory to see the current usage.
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2. COYou can read more about the `cgroup` memory metrics here http://blog.docker.io/2013/10/gathering-lxc-docker-containers-metrics/ In particular the `memory.stat` pseudo-file.
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