free将不会显示它,因为这是通过cgroups强制执行的。而是可以在主机(容器外部)上使用
/sysfs和cgroup内存进行检查:
vagrant@precise64:~$ docker run -m=524288 -d -t busybox sleep 3600f03a017b174fvagrant@precise64:~$ cat /sys/fs/cgroup/memory/lxc/f03a017b174ff1022e0f46bc1b307658c2d96ffef1dd97e7c1929a4ca61ab80f//memory.limit_in_bytes524288
要查看它的内存不足,可以运行一些将使用比分配的内存更多的内存-例如:
docker run -m=524288 -d -p 8000:8000 -t ubuntu:12.10 /usr/bin/python3 -m http.server8480df1d2d5dvagrant@precise64:~$ docker ps | grep 0f742445f839vagrant@precise64:~$ docker ps -a | grep 0f742445f8390f742445f839 ubuntu:12.10 /usr/bin/python3 -m 16 seconds ago Exit 137 blue_pig
在其中,
dmesg您应该看到容器和进程被杀死:
[ 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
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