AWS WordPress网站 – OOM杀死Apache

这个问题最初是在StackOverflow.com上提出的，我已经将它复制到更合适的ServerFault.com站点。 原来的问题，我已经投票结束，可以在这里find

我有一个AWS上托pipe的小型低stream量WordPress博客。 不幸的是，大约每周一次，该网站变得不可用，试图访问该网站留下用户挂起，直到连接超时。 在这些停机期间，我也无法通过SSH访问服务器，直到服务器重新启动。 它在重新启动实例后总是立即恢复。

AWS EC2日志的最后一行（30,000个字符限制，防止发布所有内容）：

[1079988.125918] Out of memory: Kill process 32620 (httpd) score 16 or sacrifice child [1079988.130913] Killed process 32620 (httpd) total-vm:510348kB, anon-rss:32328kB, file-rss:0kB [1079996.872570] httpd invoked oom-killer: gfp_mask=0x24280ca, order=0, oom_score_adj=0 [1079996.887776] httpd cpuset=/ mems_allowed=0 [1079996.892671] CPU: 0 PID: 374 Comm: httpd Tainted: GE 4.4.5-15.26.amzn1.x86_64 #1 [1079996.896664] Hardware name: Xen HVM domU, BIOS 4.2.amazon 12/07/2015 [1079996.896664] 0000000000000000 ffff88002f66bb58 ffffffff812c88ef ffff88002f66bd40 [1079996.896664] 0000000000000000 ffff88002f66bbe8 ffffffff811cdc8d 0000000000000001 [1079996.896664] ffffffff810b2c61 0000000000000000 0000000000000010 ffffffff817d07f9 [1079996.896664] Call Trace: [1079996.896664] [<ffffffff812c88ef>] dump_stack+0x63/0x84 [1079996.896664] [<ffffffff811cdc8d>] dump_header+0x5e/0x1d8 [1079996.896664] [<ffffffff810b2c61>] ? __raw_callee_save___pv_queued_spin_unlock+0x11/0x20 [1079996.896664] [<ffffffff811634d5>] oom_kill_process+0x205/0x3d0 [1079996.896664] [<ffffffff81163b35>] out_of_memory+0x435/0x480 [1079996.896664] [<ffffffff81168bee>] __alloc_pages_nodemask+0x91e/0xa60 [1079996.896664] [<ffffffff811ae5e5>] alloc_pages_vma+0xb5/0x210 [1079996.896664] [<ffffffff8118e296>] handle_mm_fault+0x13a6/0x1870 [1079996.896664] [<ffffffff810b2c61>] ? __raw_callee_save___pv_queued_spin_unlock+0x11/0x20 [1079996.896664] [<ffffffff810922c2>] ? finish_task_switch+0x72/0x1d0 [1079996.896664] [<ffffffff8105ea23>] __do_page_fault+0x183/0x3f0 [1079996.896664] [<ffffffff8105ecb2>] do_page_fault+0x22/0x30 [1079996.896664] [<ffffffff814de858>] page_fault+0x28/0x30 [1079996.958270] Mem-Info: [1079996.959270] active_anon:457775 inactive_anon:13 isolated_anon:0 [1079996.959270] active_file:16 inactive_file:106 isolated_file:0 [1079996.959270] unevictable:0 dirty:0 writeback:0 unstable:0 [1079996.959270] slab_reclaimable:2369 slab_unreclaimable:10892 [1079996.959270] mapped:24 shmem:35 pagetables:33000 bounce:0 [1079996.959270] free:3686 free_pcp:68 free_cma:0 [1079996.973173] Node 0 DMA free:7976kB min:40kB low:48kB high:60kB active_anon:6348kB inactive_anon:0kB active_file:4kB inactive_file:24kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15988kB managed:15904kB mlocked:0kB dirty:0kB writeback:0kB mapped:8kB shmem:0kB slab_reclaimable:72kB slab_unreclaimable:268kB kernel_stack:0kB pagetables:1036kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:168 all_unreclaimable? yes [1079996.991168] lowmem_reserve[]: 0 1984 1984 1984 [1079996.993371] Node 0 DMA32 free:6768kB min:5584kB low:6980kB high:8376kB active_anon:1824752kB inactive_anon:52kB active_file:60kB inactive_file:400kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:2080768kB managed:2035632kB mlocked:0kB dirty:0kB writeback:0kB mapped:88kB shmem:140kB slab_reclaimable:9404kB slab_unreclaimable:43300kB kernel_stack:3920kB pagetables:130964kB unstable:0kB bounce:0kB free_pcp:272kB local_pcp:272kB free_cma:0kB writeback_tmp:0kB pages_scanned:2808 all_unreclaimable? yes [1079997.012134] lowmem_reserve[]: 0 0 0 0 [1079997.014077] Node 0 DMA: 30*4kB (ME) 71*8kB (UM) 26*16kB (UME) 3*32kB (ME) 0*64kB 1*128kB (E) 2*256kB (ME) 2*512kB (ME) 1*1024kB (E) 2*2048kB (UM) 0*4096kB = 7984kB [1079997.021833] Node 0 DMA32: 478*4kB (UME) 55*8kB (UM) 210*16kB (UM) 31*32kB (M) 1*64kB (M) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 6768kB [1079997.028501] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB [1079997.032184] 160 total pagecache pages [1079997.033858] 0 pages in swap cache [1079997.035455] Swap cache stats: add 0, delete 0, find 0/0 [1079997.037793] Free swap = 0kB [1079997.039117] Total swap = 0kB [1079997.040511] 524189 pages RAM [1079997.041780] 0 pages HighMem/MovableOnly [1079997.043474] 11305 pages reserved [1079997.044872] [ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name [1079997.048548] [ 1524] 0 1524 2866 229 12 3 0 -1000 udevd [1079997.052366] [ 1647] 0 1647 2865 213 11 3 0 -1000 udevd [1079997.056081] [ 1648] 0 1648 2865 210 11 3 0 -1000 udevd [1079997.059637] [ 2045] 0 2045 2340 123 10 3 0 0 dhclient [1079997.063283] [ 2097] 0 2097 28018 106 25 3 0 -1000 auditd [1079997.067016] [ 2118] 0 2118 61865 375 25 3 0 0 rsyslogd [1079997.070879] [ 2140] 0 2140 1095 37 8 3 0 0 rngd [1079997.074484] [ 2158] 32 2158 8823 97 22 3 0 0 rpcbind [1079997.078205] [ 2179] 29 2179 9965 201 24 3 0 0 rpc.statd [1079997.081954] [ 2210] 81 2210 5448 61 15 3 0 0 dbus-daemon [1079997.085861] [ 2339] 0 2339 19458 203 40 3 0 -1000 sshd [1079997.089500] [ 2361] 38 2361 7322 140 18 3 0 0 ntpd [1079997.093148] [ 2654] 0 2654 22245 463 45 3 0 0 sendmail [1079997.096960] [ 2663] 51 2663 20109 369 40 4 0 0 sendmail [1079997.100976] [ 2678] 0 2678 102872 1914 200 3 0 0 httpd [1079997.104736] [ 2689] 0 2689 29880 146 15 3 0 0 crond [1079997.108453] [ 2703] 0 2703 4267 41 13 3 0 0 atd [1079997.112100] [ 2733] 0 2733 1615 31 8 3 0 0 agetty [1079997.115895] [ 2735] 0 2735 1078 24 8 3 0 0 mingetty [1079997.119835] [ 2738] 0 2738 1078 24 8 3 0 0 mingetty [1079997.123661] [ 2740] 0 2740 1078 24 7 3 0 0 mingetty [1079997.127430] [ 2742] 0 2742 1078 24 8 3 0 0 mingetty [1079997.131420] [ 2744] 0 2744 1078 23 8 3 0 0 mingetty [1079997.135291] [ 2746] 0 2746 1078 24 8 3 0 0 mingetty [1079997.139070] [32214] 48 32214 126502 7229 209 3 0 0 httpd [1079997.142642] [32297] 48 32297 125281 6111 207 3 0 0 httpd [1079997.146286] [32310] 48 32310 125754 6561 208 3 0 0 httpd [1079997.150023] [32346] 48 32346 125990 6820 208 3 0 0 httpd [1079997.153576] [32365] 48 32365 127220 7837 210 3 0 0 httpd [1079997.157241] [32369] 48 32369 125991 6820 208 3 0 0 httpd [1079997.160923] [32395] 48 32395 125282 6129 207 3 0 0 httpd [1079997.164515] [32498] 48 32498 125998 6758 208 3 0 0 httpd [1079997.168490] [32515] 48 32515 125281 6111 207 3 0 0 httpd [1079997.172046] [32575] 48 32575 125732 6475 208 3 0 0 httpd [1079997.175868] [32578] 48 32578 125683 6508 207 3 0 0 httpd [1079997.179602] [32584] 48 32584 125731 6561 208 3 0 0 httpd [1079997.183372] [32598] 48 32598 125683 6508 207 3 0 0 httpd [1079997.187140] [32603] 48 32603 125731 6561 208 3 0 0 httpd [1079997.190715] [32608] 48 32608 125683 6508 207 3 0 0 httpd [1079997.194454] [32612] 48 32612 126566 7496 209 3 0 0 httpd [1079997.198263] [32625] 48 32625 125524 6305 207 3 0 0 httpd [1079997.201863] [32635] 48 32635 125731 6561 208 3 0 0 httpd [1079997.205449] [32649] 48 32649 125990 6748 208 3 0 0 httpd [1079997.209316] [32650] 48 32650 107262 6519 206 3 0 0 httpd [1079997.213170] [32652] 48 32652 127395 7886 211 3 0 0 httpd [1079997.216906] [32658] 48 32658 125729 6527 208 3 0 0 httpd [1079997.220644] [32661] 48 32661 108843 7773 210 3 0 0 httpd [1079997.224418] [32666] 48 32666 125282 6111 207 3 0 0 httpd [1079997.228078] [32669] 48 32669 126892 7484 210 3 0 0 httpd [1079997.231832] [32675] 48 32675 125706 6520 207 3 0 0 httpd [1079997.235511] [32676] 48 32676 125683 6508 207 3 0 0 httpd [1079997.239227] [32681] 48 32681 125684 6508 207 3 0 0 httpd [1079997.243019] [32691] 48 32691 125993 6747 208 3 0 0 httpd [1079997.246836] [32696] 48 32696 125683 6507 207 3 0 0 httpd [1079997.250732] [32698] 48 32698 126371 6954 209 3 0 0 httpd [1079997.254287] [32700] 48 32700 107752 6734 207 3 0 0 httpd [1079997.258018] [32703] 48 32703 106347 5553 205 3 0 0 httpd [1079997.261647] [32714] 48 32714 125684 6508 207 3 0 0 httpd [1079997.265446] [32723] 48 32723 125731 6561 208 3 0 0 httpd [1079997.269066] [ 307] 48 307 125685 6506 207 3 0 0 httpd [1079997.272679] [ 314] 48 314 108660 7632 209 3 0 0 httpd [1079997.276452] [ 319] 48 319 107752 6723 207 3 0 0 httpd [1079997.280364] [ 320] 48 320 107240 6427 206 3 0 0 httpd [1079997.284027] [ 323] 48 323 107888 6912 208 3 0 0 httpd [1079997.287595] [ 324] 48 324 107122 6264 206 3 0 0 httpd [1079997.291243] [ 325] 48 325 122406 7539 209 3 0 0 httpd [1079997.294995] [ 326] 48 326 108274 7130 208 3 0 0 httpd [1079997.298756] [ 327] 48 327 124978 7732 210 3 0 0 httpd [1079997.302330] [ 329] 48 329 108274 7267 208 3 0 0 httpd [1079997.306007] [ 333] 48 333 106928 6052 206 3 0 0 httpd [1079997.309818] [ 334] 48 334 105747 4938 203 3 0 0 httpd [1079997.313613] [ 338] 48 338 108539 7521 209 3 0 0 httpd [1079997.317252] [ 339] 48 339 107816 6838 208 3 0 0 httpd [1079997.320966] [ 340] 48 340 108361 7341 209 3 0 0 httpd [1079997.324587] [ 342] 48 342 107944 6986 208 3 0 0 httpd [1079997.328421] [ 343] 48 343 103541 2605 199 3 0 0 httpd [1079997.331943] [ 344] 48 344 106288 5479 205 3 0 0 httpd [1079997.335650] [ 346] 48 346 106493 5678 205 3 0 0 httpd [1079997.339365] [ 347] 48 347 108326 7310 209 3 0 0 httpd [1079997.343168] [ 349] 48 349 106412 5579 205 3 0 0 httpd [1079997.346819] [ 350] 48 350 106612 5832 205 3 0 0 httpd [1079997.350423] [ 351] 48 351 107440 6484 207 3 0 0 httpd [1079997.354093] [ 352] 48 352 106984 6133 206 3 0 0 httpd [1079997.357822] [ 354] 48 354 107122 6265 206 3 0 0 httpd [1079997.361467] [ 355] 48 355 103541 2604 199 3 0 0 httpd [1079997.365074] [ 358] 48 358 103541 2605 199 3 0 0 httpd [1079997.368805] [ 359] 48 359 106475 5660 205 3 0 0 httpd [1079997.372852] [ 360] 48 360 104710 3796 201 3 0 0 httpd [1079997.376601] [ 370] 48 370 103538 2622 199 3 0 0 httpd [1079997.380201] [ 372] 48 372 103538 2622 199 3 0 0 httpd [1079997.383966] [ 373] 48 373 107752 6733 207 3 0 0 httpd [1079997.387998] [ 374] 48 374 108539 7520 209 3 0 0 httpd [1079997.391913] [ 375] 48 375 103541 2604 199 3 0 0 httpd [1079997.395537] [ 376] 48 376 103538 2626 199 3 0 0 httpd [1079997.399174] [ 378] 48 378 106467 5646 205 3 0 0 httpd [1079997.402981] [ 381] 48 381 107952 6967 208 3 0 0 httpd [1079997.406805] [ 383] 48 383 108338 7328 209 3 0 0 httpd [1079997.410374] [ 385] 48 385 105068 4224 202 3 0 0 httpd [1079997.414010] [ 388] 48 388 104866 4047 202 3 0 0 httpd [1079997.417701] [ 392] 48 392 105881 5036 204 3 0 0 httpd [1079997.421384] [ 394] 48 394 106347 5540 205 3 0 0 httpd [1079997.425365] [ 396] 48 396 103538 2626 199 3 0 0 httpd [1079997.429044] [ 407] 48 407 103838 2961 200 3 0 0 httpd [1079997.432577] [ 412] 48 412 103542 2605 199 3 0 0 httpd [1079997.436201] [ 413] 48 413 105079 4262 202 3 0 0 httpd [1079997.439868] [ 416] 48 416 103541 2605 199 3 0 0 httpd [1079997.443501] [ 422] 48 422 103541 2604 199 3 0 0 httpd [1079997.447093] [ 424] 48 424 103540 2637 199 3 0 0 httpd [1079997.450727] [ 426] 48 426 103542 2604 199 3 0 0 httpd [1079997.454398] [ 427] 48 427 103541 2604 199 3 0 0 httpd [1079997.458434] [ 428] 48 428 103538 2622 199 3 0 0 httpd [1079997.463763] [ 429] 48 429 103541 2604 199 3 0 0 httpd [1079997.467592] [ 437] 48 437 103538 2627 199 3 0 0 httpd [1079997.471172] [ 438] 48 438 104324 3456 201 3 0 0 httpd [1079997.474751] [ 439] 48 439 103541 2604 199 3 0 0 httpd [1079997.478432] [ 440] 48 440 103545 2622 199 3 0 0 httpd [1079997.482044] [ 441] 48 441 103539 2622 199 3 0 0 httpd [1079997.485780] [ 442] 48 442 106474 5667 205 3 0 0 httpd [1079997.489572] [ 445] 48 445 103547 2620 199 3 0 0 httpd [1079997.493165] [ 448] 48 448 103541 2604 199 3 0 0 httpd [1079997.496719] [ 449] 48 449 104500 3638 201 3 0 0 httpd [1079997.500255] [ 450] 48 450 106208 5364 204 3 0 0 httpd [1079997.503768] [ 468] 48 468 103613 2733 199 3 0 0 httpd [1079997.507327] [ 469] 48 469 103538 2622 199 3 0 0 httpd [1079997.511042] [ 470] 48 470 103541 2604 199 3 0 0 httpd [1079997.514670] [ 471] 48 471 103541 2604 199 3 0 0 httpd [1079997.518298] [ 472] 48 472 103542 2605 199 3 0 0 httpd [1079997.522039] [ 480] 48 480 104314 3471 201 3 0 0 httpd [1079997.525663] [ 481] 48 481 103610 2670 199 3 0 0 httpd [1079997.529538] [ 482] 48 482 103541 2604 199 3 0 0 httpd [1079997.533280] [ 483] 48 483 103542 2604 199 3 0 0 httpd [1079997.536999] [ 484] 48 484 103538 2622 199 3 0 0 httpd [1079997.540651] [ 485] 48 485 103538 2622 199 3 0 0 httpd [1079997.544204] [ 486] 48 486 104094 3224 200 3 0 0 httpd [1079997.547808] [ 488] 48 488 119730 2929 201 3 0 0 httpd [1079997.551370] [ 489] 48 489 103538 2622 199 3 0 0 httpd [1079997.554962] [ 490] 48 490 104808 3968 202 3 0 0 httpd [1079997.558875] [ 491] 48 491 103538 2622 199 3 0 0 httpd [1079997.562490] [ 494] 48 494 104059 3199 200 3 0 0 httpd [1079997.566339] [ 495] 48 495 104143 3232 200 3 0 0 httpd [1079997.570045] [ 501] 48 501 103564 2562 199 3 0 0 httpd [1079997.573871] [ 502] 48 502 104707 3771 201 3 0 0 httpd [1079997.577369] [ 503] 48 503 103538 2621 199 3 0 0 httpd [1079997.580897] [ 504] 48 504 103541 2609 199 3 0 0 httpd [1079997.584364] [ 505] 48 505 103539 2621 199 3 0 0 httpd [1079997.588037] [ 506] 48 506 103545 2621 199 3 0 0 httpd [1079997.591946] [ 507] 48 507 103541 2604 199 3 0 0 httpd [1079997.595820] [ 508] 48 508 103538 2622 199 3 0 0 httpd [1079997.599555] [ 509] 48 509 103541 2604 199 3 0 0 httpd [1079997.603102] [ 510] 48 510 103475 2562 199 3 0 0 httpd [1079997.609123] [ 511] 48 511 103539 2622 199 3 0 0 httpd [1079997.613009] [ 512] 48 512 103281 2335 199 3 0 0 httpd [1079997.616695] [ 513] 48 513 103475 2562 199 3 0 0 httpd [1079997.620272] [ 514] 48 514 103541 2604 199 3 0 0 httpd [1079997.623949] [ 515] 48 515 103475 2562 199 3 0 0 httpd [1079997.627601] [ 516] 48 516 103066 2051 198 3 0 0 httpd [1079997.631257] [ 517] 48 517 103285 2307 199 3 0 0 httpd [1079997.634944] [ 518] 48 518 103539 2622 199 3 0 0 httpd [1079997.638875] [ 519] 48 519 103484 2517 199 3 0 0 httpd [1079997.642467] [ 520] 48 520 103541 2601 199 3 0 0 httpd [1079997.646281] [ 521] 48 521 103564 2562 199 3 0 0 httpd [1079997.650000] [ 522] 48 522 103254 2242 199 3 0 0 httpd [1079997.654227] [ 523] 48 523 103541 2601 199 3 0 0 httpd [1079997.657861] [ 524] 48 524 102968 2025 198 3 0 0 httpd [1079997.662169] [ 525] 48 525 103433 2411 199 3 0 0 httpd [1079997.666436] [ 526] 48 526 102968 2050 198 3 0 0 httpd [1079997.670950] [ 527] 48 527 103254 2252 199 3 0 0 httpd [1079997.676349] [ 528] 48 528 103281 2350 199 3 0 0 httpd [1079997.680095] [ 529] 48 529 103538 2561 199 3 0 0 httpd [1079997.683947] [ 530] 48 530 103173 2126 198 3 0 0 httpd [1079997.687608] [ 531] 48 531 103228 2262 199 3 0 0 httpd [1079997.691466] [ 532] 48 532 103475 2515 199 3 0 0 httpd [1079997.694988] [ 533] 48 533 103173 2119 198 3 0 0 httpd [1079997.698754] [ 534] 48 534 102975 1973 198 3 0 0 httpd [1079997.702324] [ 535] 48 535 103434 2409 199 3 0 0 httpd [1079997.705935] [ 536] 0 536 102872 1915 192 3 0 0 httpd [1079997.709734] [ 537] 48 537 102968 2032 198 3 0 0 httpd [1079997.713367] [ 538] 48 538 102873 1926 198 3 0 0 httpd [1079997.717141] [ 539] 48 539 102872 1922 196 3 0 0 httpd [1079997.720839] [ 540] 48 540 102975 1973 198 3 0 0 httpd [1079997.724457] [ 541] 0 541 102872 1915 192 3 0 0 httpd [1079997.728106] [ 542] 48 542 102872 1915 193 3 0 0 httpd [1079997.731629] [ 543] 48 543 102872 1915 193 3 0 0 httpd [1079997.735163] [ 544] 48 544 102872 1915 193 3 0 0 httpd [1079997.738927] Out of memory: Kill process 32652 (httpd) score 15 or sacrifice child [1079997.742215] Killed process 32652 (httpd) total-vm:509580kB, anon-rss:31536kB, file-rss:8kB 

我相信这是在给定日志的情况下使用较less的内存，但是将实例升级到较大的实例并不能防止发生问题。 此外，该网站的stream量也非常低（每周<50个用户），所以我不需要比当前正在运行的t1-medium更大的服务器。

• RewriteEngine追加/％25 /到我的目录http-> https
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• 不确定这个.htaccess规则集正在做什么
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• 本地主机的Web服务器VS单独的服务器的小型办公室

软件版本：

PHP（ php --version ）：

 PHP 5.6.21 (cli) (built: May 2 2016 23:27:53) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies 

MySQL（ mysql --version ）：

 mysql Ver 14.14 Distrib 5.5.46, for Linux (x86_64) using readline 5.1 

Apache（ apachectl -V ）：

 Server version: Apache/2.4.18 (Amazon) Server built: Mar 7 2016 22:32:11 Server's Module Magic Number: 20120211:52 Server loaded: APR 1.5.1, APR-UTIL 1.4.1 Compiled using: APR 1.5.1, APR-UTIL 1.4.1 Architecture: 64-bit Server MPM: prefork threaded: no forked: yes (variable process count) Server compiled with.... -D APR_HAS_SENDFILE -D APR_HAS_MMAP -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled) -D APR_USE_SYSVSEM_SERIALIZE -D APR_USE_PTHREAD_SERIALIZE -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT -D APR_HAS_OTHER_CHILD -D AP_HAVE_RELIABLE_PIPED_LOGS -D DYNAMIC_MODULE_LIMIT=256 -D HTTPD_ROOT="/etc/httpd" -D SUEXEC_BIN="/usr/sbin/suexec" -D DEFAULT_PIDLOG="/var/run/httpd/httpd.pid" -D DEFAULT_SCOREBOARD="logs/apache_runtime_status" -D DEFAULT_ERRORLOG="logs/error_log" -D AP_TYPES_CONFIG_FILE="conf/mime.types" -D SERVER_CONFIG_FILE="conf/httpd.conf" 

WordPress（ grep wp_version "$WPDIR/wp-includes/version.php" ）：

  * @global string $wp_version $wp_version = '4.4.3'; 

free -m命令输出：

请注意，我已经重新启动服务器，错误当前不影响服务器。 所以下面的输出不是错误发生时的输出，而是重新启动服务器之后的输出。

  total used free shared buffers cached Mem: 2003 741 1261 0 21 469 -/+ buffers/cache: 250 1752 Swap: 0 0 0 

 StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 50 MaxRequestsPerChild 200