请帮我解决 apache 问题。我在 DigitalOcean 上获得了一个 droplet，内存为 512mb（Debian）。MODX CMS 上有 3 个站点（在 php 上运行）。今天早上，我认为系统发现了内存不足问题并开始终止进程（大约有 43 个 apache 进程）。它杀死了 mysqld 并开始逐个终止 apache2。你能告诉我我必须调整哪个配置吗？mysql 的 Tuning-primer.sh 显示内存分配没有问题。
这是我的my.cnf：
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
myisam-recover = BACKUP
max_connections = 70
max_heap_table_size = 25M
tmp_table_size = 25M
query_cache_limit = 1M
query_cache_size = 25M
[mysqldump]
quick quote-names
max_allowed_packet = 16M
[isamchk]
key_buffer = 16M
这里是日志：
Dec 10 06:41:27 cloud kernel: [1711384.052842] apache2 invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0
Dec 10 06:41:27 cloud kernel: [1711384.053081] apache2 cpuset=/ mems_allowed=0
Dec 10 06:41:27 cloud kernel: [1711384.053177] Pid: 21594, comm: apache2 Not tainted 3.2.0-4-amd64 #1 Debian 3.2.41-2+deb7u2
Dec 10 06:41:27 cloud kernel: [1711384.053362] Call Trace:
Dec 10 06:41:27 cloud kernel: [1711384.053453] [<ffffffff810b6ac2>] ? dump_header+0x78/0x1bd
Dec 10 06:41:27 cloud kernel: [1711384.053580] [<ffffffff81163cae>] ? security_real_capable_noaudit+0x40/0x4f
Dec 10 06:41:27 cloud kernel: [1711384.053727] [<ffffffff810b6e8b>] ? oom_kill_process+0x49/0x271
Dec 10 06:41:27 cloud kernel: [1711384.053864] [<ffffffff810b7586>] ? out_of_memory+0x2ea/0x337
Dec 10 06:41:27 cloud kernel: [1711384.054043] [<ffffffff810bb214>] ? __alloc_pages_nodemask+0x629/0x7aa
Dec 10 06:41:27 cloud kernel: [1711384.054194] [<ffffffff810e470a>] ? alloc_pages_current+0xc7/0xe4
Dec 10 06:41:27 cloud kernel: [1711384.054326] [<ffffffff810b61c7>] ? filemap_fault+0x24f/0x33e
Dec 10 06:41:27 cloud kernel: [1711384.054454] [<ffffffff810ce344>] ? __do_fault+0xc8/0x3ac
Dec 10 06:41:27 cloud kernel: [1711384.054572] [<ffffffff810d08fb>] ? handle_pte_fault+0x298/0x79f
Dec 10 06:41:27 cloud kernel: [1711384.054700] [<ffffffff810cde99>] ? pte_offset_kernel+0x16/0x35
Dec 10 06:41:27 cloud kernel: [1711384.054840] [<ffffffff813509bd>] ? do_page_fault+0x312/0x337
Dec 10 06:41:27 cloud kernel: [1711384.054965] [<ffffffff810d5ce0>] ? mmap_region+0x353/0x44a
Dec 10 06:41:27 cloud kernel: [1711384.055086] [<ffffffff8134dfe5>] ? async_page_fault+0x25/0x30
Dec 10 06:41:27 cloud kernel: [1711384.055210] Mem-Info:
Dec 10 06:41:27 cloud kernel: [1711384.055265] Node 0 DMA per-cpu:
Dec 10 06:41:27 cloud kernel: [1711384.055346] CPU 0: hi: 0, btch: 1 usd: 0
Dec 10 06:41:27 cloud kernel: [1711384.055591] Node 0 DMA32 per-cpu:
Dec 10 06:41:27 cloud kernel: [1711384.055811] CPU 0: hi: 186, btch: 31 usd: 0
Dec 10 06:41:27 cloud kernel: [1711384.056074] active_anon:113121 inactive_anon:458 isolated_anon:0
Dec 10 06:41:27 cloud kernel: [1711384.056075] active_file:92 inactive_file:104 isolated_file:45
Dec 10 06:41:27 cloud kernel: [1711384.056076] unevictable:0 dirty:0 writeback:1 unstable:0
Dec 10 06:41:27 cloud kernel: [1711384.056077] free:1210 slab_reclaimable:1522 slab_unreclaimable:2999
Dec 10 06:41:27 cloud kernel: [1711384.056078] mapped:419 shmem:374 pagetables:5928 bounce:0
Dec 10 06:41:27 cloud kernel: [1711384.057383] Node 0 DMA free:2048kB min:84kB low:104kB high:124kB active_anon:13372kB inactive_anon:8kB active_file:0kB inactive_file:24kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15680kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:44kB slab_unreclaimable:136kB kernel_stack:120kB pagetables:96kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:902 all_unreclaimable? yes
Dec 10 06:41:27 cloud kernel: [1711384.059096] lowmem_reserve[]: 0 489 489 489
Dec 10 06:41:27 cloud kernel: [1711384.059359] Node 0 DMA32 free:2792kB min:2784kB low:3480kB high:4176kB active_anon:439112kB inactive_anon:1824kB active_file:368kB inactive_file:392kB unevictable:0kB isolated(anon):0kB isolated(file):180kB present:500948kB mlocked:0kB dirty:0kB writeback:4kB mapped:1676kB shmem:1496kB slab_reclaimable:6044kB slab_unreclaimable:11860kB kernel_stack:1320kB pagetables:23616kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:59064 all_unreclaimable? yes
Dec 10 06:41:27 cloud kernel: [1711384.065944] lowmem_reserve[]: 0 0 0 0
Dec 10 06:41:27 cloud kernel: [1711384.066199] Node 0 DMA: 12*4kB 0*8kB 1*16kB 0*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2048kB
Dec 10 06:41:27 cloud kernel: [1711384.066781] Node 0 DMA32: 676*4kB 14*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2816kB
Dec 10 06:41:27 cloud kernel: [1711384.067365] 626 total pagecache pages
Dec 10 06:41:27 cloud kernel: [1711384.067585] 0 pages in swap cache
Dec 10 06:41:27 cloud kernel: [1711384.067797] Swap cache stats: add 0, delete 0, find 0/0
Dec 10 06:41:27 cloud kernel: [1711384.068060] Free swap = 0kB
Dec 10 06:41:27 cloud kernel: [1711384.068271] Total swap = 0kB
Dec 10 06:41:27 cloud kernel: [1711384.069956] 131053 pages RAM
Dec 10 06:41:27 cloud kernel: [1711384.070168] 3819 pages reserved
Dec 10 06:41:27 cloud kernel: [1711384.070379] 77878 pages shared
Dec 10 06:41:27 cloud kernel: [1711384.070682] 122871 pages non-shared
Dec 10 06:41:27 cloud kernel: [1711384.070899] [ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name
Dec 10 06:41:27 cloud kernel: [1711384.071343] [ 311] 0 311 5355 157 0 -17 -1000 udevd
Dec 10 06:41:27 cloud kernel: [1711384.071782] [ 449] 0 449 5330 139 0 -17 -1000 udevd
Dec 10 06:41:27 cloud kernel: [1711384.072250] [ 450] 0 450 5361 156 0 -17 -1000 udevd
Dec 10 06:41:27 cloud kernel: [1711384.072695] [ 1866] 0 1866 13514 431 0 0 0 rsyslogd
Dec 10 06:41:27 cloud kernel: [1711384.073146] [ 1918] 0 1918 1028 35 0 0 0 acpid
Dec 10 06:41:27 cloud kernel: [1711384.073593] [ 1973] 0 1973 70397 2566 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.074044] [ 2000] 0 2000 4167 38 0 0 0 atd
Dec 10 06:41:27 cloud kernel: [1711384.074483] [ 2048] 0 2048 5101 63 0 0 0 cron
Dec 10 06:41:27 cloud kernel: [1711384.074921] [ 2078] 102 2078 7450 85 0 0 0 dbus-daemon
Dec 10 06:41:27 cloud kernel: [1711384.075370] [ 2487] 0 2487 12462 153 0 -17 -1000 sshd
Dec 10 06:41:27 cloud kernel: [1711384.075805] [ 2857] 101 2857 11182 108 0 0 0 exim4
Dec 10 06:41:27 cloud kernel: [1711384.076262] [ 2886] 0 2886 4063 39 0 0 0 getty
Dec 10 06:41:27 cloud kernel: [1711384.076720] [ 2887] 0 2887 4063 42 0 0 0 getty
Dec 10 06:41:27 cloud kernel: [1711384.077161] [ 2888] 0 2888 4063 40 0 0 0 getty
Dec 10 06:41:27 cloud kernel: [1711384.077603] [ 2889] 0 2889 4063 41 0 0 0 getty
Dec 10 06:41:27 cloud kernel: [1711384.078047] [ 2890] 0 2890 4063 41 0 0 0 getty
Dec 10 06:41:27 cloud kernel: [1711384.078536] [ 2891] 0 2891 4063 40 0 0 0 getty
Dec 10 06:41:27 cloud kernel: [1711384.078979] [ 3711] 0 3711 31922 278 0 0 0 console-kit-dae
Dec 10 06:41:27 cloud kernel: [1711384.079444] [21957] 0 21957 1044 37 0 0 0 mysqld_safe
Dec 10 06:41:27 cloud kernel: [1711384.079895] [22320] 105 22320 96631 19582 0 0 0 mysqld
Dec 10 06:41:27 cloud kernel: [1711384.080357] [22321] 0 22321 1396 26 0 0 0 logger
Dec 10 06:41:27 cloud kernel: [1711384.080835] [ 3086] 33 3086 41182 1994 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.081286] [21327] 33 21327 73497 5283 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.081731] [21404] 33 21404 73951 5828 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.082230] [21405] 33 21405 74016 5890 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.082675] [21419] 33 21419 73379 5166 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.083117] [21422] 33 21422 73312 5159 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.083558] [21526] 33 21526 73371 5187 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.083979] [21527] 33 21527 73433 5238 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.084425] [21528] 33 21528 73568 5335 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.084854] [21529] 33 21529 73184 5059 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.085285] [21547] 33 21547 73439 5220 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.085733] [21577] 33 21577 73459 5228 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.086223] [21578] 33 21578 73219 4983 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.086650] [21579] 33 21579 73464 5237 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.087091] [21580] 33 21580 73349 5082 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.087559] [21581] 33 21581 73349 5077 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.088043] [21582] 33 21582 73349 5100 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.088520] [21583] 33 21583 72404 4272 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.088972] [21584] 33 21584 72404 4272 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.089398] [21585] 33 21585 73349 5106 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.089821] [21586] 33 21586 73412 5192 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.090283] [21587] 33 21587 73242 5024 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.090748] [21588] 33 21588 73242 5023 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.091176] [21589] 33 21589 72652 4444 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.091602] [21590] 33 21590 71976 3758 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.092042] [21591] 33 21591 71381 3164 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.092501] [21592] 33 21592 70915 2766 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.092923] [21593] 33 21593 61758 2411 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.093349] [21594] 33 21594 70639 2497 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.093771] [21595] 33 21595 70639 2491 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.094235] [21596] 33 21596 70637 2490 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.094665] [21597] 33 21597 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.095096] [21598] 33 21598 70628 2483 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.095522] [21599] 33 21599 70628 2483 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.095951] [21600] 33 21600 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.096389] [21601] 33 21601 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.096827] [21602] 33 21602 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.097259] [21603] 33 21603 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.097684] [21604] 33 21604 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.098149] [21605] 33 21605 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.098575] [21606] 33 21606 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.099030] [21607] 33 21607 70628 2482 0 0 0 apache2
Dec 10 06:41:27 cloud kernel: [1711384.099451] Out of memory: Kill process 22320 (mysqld) score 154 or sacrifice child
Dec 10 06:41:27 cloud kernel: [1711384.099883] Killed process 22320 (mysqld) total-vm:386524kB, anon-rss:78328kB, file-rss:0kB
Dec 10 06:41:27 cloud mysqld_safe: Number of processes running now: 0
Dec 10 06:41:27 cloud mysqld_safe: mysqld restarted
Dec 10 06:41:28 cloud kernel: [1711385.712243] apache2 invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0
Dec 10 06:41:28 cloud kernel: [1711385.712810] apache2 cpuset=/ mems_allowed=0
Dec 10 06:41:28 cloud kernel: [1711385.713046] Pid: 21595, comm: apache2 Not tainted 3.2.0-4-amd64 #1 Debian 3.2.41-2+deb7u2
Dec 10 06:41:28 cloud kernel: [1711385.718027] Mem-Info:
Dec 10 06:41:28 cloud kernel: [1711385.718222] Node 0 DMA per-cpu:
Dec 10 06:41:28 cloud kernel: [1711385.718440] CPU 0: hi: 0, btch: 1 usd: 0
Dec 10 06:41:28 cloud kernel: [1711385.718683] Node 0 DMA32 per-cpu:
Dec 10 06:41:28 cloud kernel: [1711385.718903] CPU 0: hi: 186, btch: 31 usd: 0
Dec 10 06:41:28 cloud kernel: [1711385.719148] active_anon:113844 inactive_anon:461 isolated_anon:2
Dec 10 06:41:28 cloud kernel: [1711385.719149] active_file:14 inactive_file:32 isolated_file:33
Dec 10 06:41:28 cloud kernel: [1711385.719150] unevictable:0 dirty:0 writeback:20 unstable:0
Dec 10 06:41:28 cloud kernel: [1711385.719151] free:1210 slab_reclaimable:1148 slab_unreclaimable:2950
Dec 10 06:41:28 cloud kernel: [1711385.719152] mapped:351 shmem:373 pagetables:5843 bounce:0
Dec 10 06:41:28 cloud kernel: [1711385.725329] Node 0 DMA free:2048kB min:84kB low:104kB high:124kB active_anon:13388kB inactive_anon:8kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15680kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:32kB slab_unreclaimable:136kB kernel_stack:120kB pagetables:108kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Dec 10 06:41:28 cloud kernel: [1711385.726946] lowmem_reserve[]: 0 489 489 489
Dec 10 06:41:28 cloud kernel: [1711385.727208] Node 0 DMA32 free:2792kB min:2784kB low:3480kB high:4176kB active_anon:441988kB inactive_anon:1836kB active_file:56kB inactive_file:128kB unevictable:0kB isolated(anon):8kB isolated(file):132kB present:500948kB mlocked:0kB dirty:0kB writeback:80kB mapped:1404kB shmem:1492kB slab_reclaimable:4560kB slab_unreclaimable:11664kB kernel_stack:1144kB pagetables:23264kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:33394 all_unreclaimable? yes
Dec 10 06:41:28 cloud kernel: [1711385.728895] lowmem_reserve[]: 0 0 0 0
Dec 10 06:41:28 cloud kernel: [1711385.729147] Node 0 DMA: 14*4kB 0*8kB 1*16kB 0*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2056kB
Dec 10 06:41:28 cloud kernel: [1711385.729730] Node 0 DMA32: 689*4kB 5*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2796kB
Dec 10 06:41:28 cloud kernel: [1711385.730347] 455 total pagecache pages
Dec 10 06:41:28 cloud kernel: [1711385.730567] 0 pages in swap cache
Dec 10 06:41:28 cloud kernel: [1711385.730782] Swap cache stats: add 0, delete 0, find 0/0
Dec 10 06:41:28 cloud kernel: [1711385.731031] Free swap = 0kB
Dec 10 06:41:28 cloud kernel: [1711385.731234] Total swap = 0kB
Dec 10 06:41:28 cloud kernel: [1711385.732988] 131053 pages RAM
Dec 10 06:41:28 cloud kernel: [1711385.733203] 3819 pages reserved
Dec 10 06:41:28 cloud kernel: [1711385.733412] 71552 pages shared
Dec 10 06:41:28 cloud kernel: [1711385.733649] 123160 pages non-shared
Dec 10 06:41:28 cloud kernel: [1711385.733952] [ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name
Dec 10 06:41:28 cloud kernel: [1711385.734422] [ 311] 0 311 5355 157 0 -17 -1000 udevd
Dec 10 06:41:28 cloud kernel: [1711385.734866] [ 449] 0 449 5330 139 0 -17 -1000 udevd
Dec 10 06:41:28 cloud kernel: [1711385.735305] [ 450] 0 450 5361 156 0 -17 -1000 udevd
Dec 10 06:41:28 cloud kernel: [1711385.735750] [ 1866] 0 1866 13514 484 0 0 0 rsyslogd
Dec 10 06:41:28 cloud kernel: [1711385.736210] [ 1918] 0 1918 1028 35 0 0 0 acpid
Dec 10 06:41:28 cloud kernel: [1711385.736648] [ 1973] 0 1973 70397 2538 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.737091] [ 2000] 0 2000 4167 38 0 0 0 atd
Dec 10 06:41:28 cloud kernel: [1711385.737524] [ 2048] 0 2048 5101 63 0 0 0 cron
Dec 10 06:41:28 cloud kernel: [1711385.737964] [ 2078] 102 2078 7450 85 0 0 0 dbus-daemon
Dec 10 06:41:28 cloud kernel: [1711385.738413] [ 2487] 0 2487 12462 153 0 -17 -1000 sshd
Dec 10 06:41:28 cloud kernel: [1711385.738853] [ 2857] 101 2857 11182 108 0 0 0 exim4
Dec 10 06:41:28 cloud kernel: [1711385.739291] [ 2886] 0 2886 4063 39 0 0 0 getty
Dec 10 06:41:28 cloud kernel: [1711385.739736] [ 2887] 0 2887 4063 42 0 0 0 getty
Dec 10 06:41:28 cloud kernel: [1711385.740186] [ 2888] 0 2888 4063 40 0 0 0 getty
Dec 10 06:41:28 cloud kernel: [1711385.740634] [ 2889] 0 2889 4063 41 0 0 0 getty
Dec 10 06:41:28 cloud kernel: [1711385.741388] [ 2890] 0 2890 4063 41 0 0 0 getty
Dec 10 06:41:28 cloud kernel: [1711385.741828] [ 2891] 0 2891 4063 40 0 0 0 getty
Dec 10 06:41:28 cloud kernel: [1711385.742276] [ 3711] 0 3711 31922 278 0 0 0 console-kit-dae
Dec 10 06:41:28 cloud kernel: [1711385.742736] [21957] 0 21957 1044 37 0 0 0 mysqld_safe
Dec 10 06:41:28 cloud kernel: [1711385.743188] [ 3086] 33 3086 41182 1994 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.743627] [21327] 33 21327 73497 5280 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.744164] [21404] 33 21404 73951 5825 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.744607] [21405] 33 21405 74016 5890 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.745209] [21419] 33 21419 73379 5163 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.745721] [21422] 33 21422 73312 5159 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.746433] [21526] 33 21526 73371 5187 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.746880] [21527] 33 21527 73433 5235 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.747322] [21528] 33 21528 73568 5332 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.747765] [21529] 33 21529 73212 5059 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.748247] [21547] 33 21547 73439 5255 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.748691] [21577] 33 21577 73459 5240 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.749159] [21578] 33 21578 73219 4991 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.749602] [21579] 33 21579 73464 5245 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.750072] [21580] 33 21580 73349 5082 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.750515] [21581] 33 21581 73349 5077 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.750953] [21582] 33 21582 73349 5150 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.751393] [21583] 33 21583 72404 4272 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.751836] [21584] 33 21584 72404 4272 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.752294] [21585] 33 21585 73349 5106 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.752747] [21586] 33 21586 73412 5196 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.753210] [21587] 33 21587 73250 5042 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.753653] [21588] 33 21588 73250 5047 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.754100] [21589] 33 21589 73107 4943 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.754543] [21590] 33 21590 72544 4343 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.754980] [21591] 33 21591 72109 3947 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.755426] [21592] 33 21592 72109 3892 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.755868] [21594] 33 21594 71852 3674 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.756324] [21595] 33 21595 71929 3743 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.756771] [21596] 33 21596 71929 3742 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.757210] [21597] 33 21597 71763 3568 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.757652] [21598] 33 21598 71929 3743 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.758098] [21599] 33 21599 71929 3742 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.758541] [21600] 33 21600 71763 3570 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.758979] [21601] 33 21601 71763 3568 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.759430] [21602] 33 21602 71575 3406 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.759868] [21603] 33 21603 71123 2948 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.760327] [21604] 33 21604 71087 2857 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.760766] [21605] 33 21605 71087 2859 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.761210] [21606] 33 21606 71575 3406 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.761656] [21607] 33 21607 71087 2857 0 0 0 apache2
Dec 10 06:41:28 cloud kernel: [1711385.762101] [21620] 105 21620 30993 668 0 0 0 mysqld
Dec 10 06:41:28 cloud kernel: [1711385.762542] [21621] 0 21621 1396 23 0 0 0 logger
Dec 10 06:41:28 cloud kernel: [1711385.762978] Out of memory: Kill process 21405 (apache2) score 47 or sacrifice child
Dec 10 06:41:28 cloud kernel: [1711385.763420] Killed process 21405 (apache2) total-vm:296064kB, anon-rss:23560kB, file-rss:0kB
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 [Note] Plugin 'FEDERATED' is disabled.
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 InnoDB: The InnoDB memory heap is disabled
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 InnoDB: Mutexes and rw_locks use GCC atomic builtins
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 InnoDB: Compressed tables use zlib 1.2.7
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 InnoDB: Using Linux native AIO
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 InnoDB: Initializing buffer pool, size = 128.0M
Dec 10 06:41:29 cloud mysqld: InnoDB: mmap(137363456 bytes) failed; errno 12
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 InnoDB: Completed initialization of buffer pool
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 InnoDB: Fatal error: cannot allocate memory for the buffer pool
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 [ERROR] Plugin 'InnoDB' init function returned error.
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 [ERROR] Unknown/unsupported storage engine: InnoDB
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 [ERROR] Aborting
Dec 10 06:41:29 cloud mysqld:
Dec 10 06:41:29 cloud mysqld: 131210 6:41:28 [Note] /usr/sbin/mysqld: Shutdown complete
Dec 10 06:41:29 cloud mysqld:
Dec 10 06:41:30 cloud mysqld_safe: mysqld from pid file /var/run/mysqld/mysqld.pid ended
答案1
配置 nginx + php-fmp 静态池，您将能够获得最稳定的 RAM 使用率。
如果您使用 apache + php 模块，则您的最大 apache 内存使用量为 MaxClients * 平均请求内存使用量。计算一下，您就会知道您的设置能够使用多少内存：) 或者，您可以限制 MaxClients，但 nginx + php-fmp 效果更好。
至少要确保，来自 tuning-primer.sh 的 (max php proceses * php memory_limit) + max mysql memory 使用量不会比你的 vm RAM 多很多。
答案2
根据您的 my.cnf 和 MySQL 计算器工具http://www.omh.cc/mycnf/
您当前的配置有 70 个连接，需要 1.3GB 的 RAM。
作为Tappet Brothers 说（或者在退休之前曾经这样做过），“那将是你的问题”。
您需要减少连接池的大小（我从这里开始......）或内存缓冲区的大小......
我想问的是这些是否是默认值，可能不适合具有严重低内存（如 DO 液滴），或者是否已得到其他来源的推荐。
一个选择是将数据库服务器移至单独的 droplet，以提供更好的整体资源分配。