阿里云服务器磁盘BPS突增
基本原因是因为内存不足导致。
一开始是因为`php-fpm` 进程开太多导致较为频繁的BPS突增（IOPS突增），减少之后稳定运行了十几个小时，然后又出问题了，有如下日志：
```
Jan 28 07:23:57 ubuntu systemd: Starting Daily apt download activities...
Jan 28 07:23:58 ubuntu systemd: Starting Update APT News...
Jan 28 07:23:58 ubuntu systemd: Starting Update the local ESM caches...
Jan 28 07:23:58 ubuntu systemd: apt-news.service: Deactivated successfully.
Jan 28 07:23:58 ubuntu systemd: Finished Update APT News.
Jan 28 07:24:02 ubuntu systemd: esm-cache.service: Deactivated successfully.
Jan 28 07:24:02 ubuntu systemd: Finished Update the local ESM caches.
```
怀疑是 `apt` 自动更新引起
oom日志：
```
Jan 28 07:54:46 ubuntu kernel: Tasks state (memory values in pages):
Jan 28 07:54:46 ubuntu kernel: uidtgid total_vm rss pgtables_bytes swapents oom_score_adj name
Jan 28 07:54:46 ubuntu kernel: [ 377] 0 377 9984 936 110592 0 -250 systemd-journal
Jan 28 07:54:46 ubuntu kernel: [ 420] 0 420 72328 6774 114688 0 -1000 multipathd
Jan 28 07:54:46 ubuntu kernel: [ 421] 0 421 3132 1180 69632 0 -1000 systemd-udevd
Jan 28 07:54:46 ubuntu kernel: [ 705] 101 705 4064 843 69632 0 0 systemd-network
Jan 28 07:54:46 ubuntu kernel: [ 707] 102 707 6384 1774 81920 0 0 systemd-resolve
Jan 28 07:54:46 ubuntu kernel: [ 721] 0 721 4856 229 65536 0 0 assist_daemon
Jan 28 07:54:46 ubuntu kernel: [ 723] 0 723 172438 977 86016 0 0 aliyun-service
Jan 28 07:54:46 ubuntu kernel: [ 731] 0 731 1724 516 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: [ 732] 103 732 2193 683 57344 0 -900 dbus-daemon
Jan 28 07:54:46 ubuntu kernel: [ 735] 0 735 697 374 53248 0 0 atopacctd
Jan 28 07:54:46 ubuntu kernel: [ 750] 0 750 8210 3037 94208 0 0 networkd-dispat
Jan 28 07:54:46 ubuntu kernel: [ 752] 0 752 58625 482 86016 0 0 polkitd
Jan 28 07:54:46 ubuntu kernel: [ 756] 107 756 55601 723 77824 0 0 rsyslogd
Jan 28 07:54:46 ubuntu kernel: [ 765] 0 765 329802 2444 233472 0 -900 snapd
Jan 28 07:54:46 ubuntu kernel: [ 777] 0 777 3873 880 65536 0 0 systemd-logind
Jan 28 07:54:46 ubuntu kernel: [ 783] 0 783 65342 3777 135168 0 0 tuned
Jan 28 07:54:46 ubuntu kernel: [ 784] 0 784 98117 904 131072 0 0 udisksd
Jan 28 07:54:46 ubuntu kernel: [ 785] 0 785 966 275 49152 0 0 atd
Jan 28 07:54:46 ubuntu kernel: [ 786] 0 786 339209 3457 294912 0 -999 containerd
Jan 28 07:54:46 ubuntu kernel: [ 835] 114 835 4732 733 61440 0 0 chronyd
Jan 28 07:54:46 ubuntu kernel: [ 849] 0 849 1450 164 53248 0 0 agetty
Jan 28 07:54:46 ubuntu kernel: [ 868] 114 868 2650 139 61440 0 0 chronyd
Jan 28 07:54:46 ubuntu kernel: [ 896] 0 896 1544 212 49152 0 0 agetty
Jan 28 07:54:46 ubuntu kernel: [ 903] 0 903 10596 223 90112 0 0 AliYunDunUpdate
Jan 28 07:54:46 ubuntu kernel: [ 953] 0 953 27435 2844 114688 0 0 unattended-upgr
Jan 28 07:54:46 ubuntu kernel: [ 956] 0 956 61058 554 102400 0 0 ModemManager
Jan 28 07:54:46 ubuntu kernel: [ 957] 0 957 3858 1060 69632 0 -1000 sshd
Jan 28 07:54:46 ubuntu kernel: [ 1019] 01019 23507 518 266240 0 0 AliYunDun
Jan 28 07:54:46 ubuntu kernel: [ 1043] 01043 35212 4380 335872 0 0 AliYunDunMonito
Jan 28 07:54:46 ubuntu kernel: [ 1075] 01075 610419 8020 483328 0 -500 dockerd
Jan 28 07:54:46 ubuntu kernel: [ 1401] 01401 180082 689 110592 0 -998 containerd-shim
Jan 28 07:54:46 ubuntu kernel: [ 1426] 01426 454996 535 188416 0 -500 docker-proxy
Jan 28 07:54:46 ubuntu kernel: [ 1434] 01434 399537 312 131072 0 -500 docker-proxy
Jan 28 07:54:46 ubuntu kernel: [ 1435] 01435 592 17 40960 0 0 dumb-init
Jan 28 07:54:46 ubuntu kernel: [ 1498] 01498 180018 693 114688 0 -998 containerd-shim
Jan 28 07:54:46 ubuntu kernel: [ 1530] 9991530 438449 1473431572864 0 0 mysqld
Jan 28 07:54:46 ubuntu kernel: [ 1554] 01554 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: [ 2981] 02981 417970 164 147456 0 -500 docker-proxy
Jan 28 07:54:46 ubuntu kernel: [ 2989] 02989 418034 432 147456 0 -500 docker-proxy
Jan 28 07:54:46 ubuntu kernel: [ 3010] 03010 180082 707 106496 0 -998 containerd-shim
Jan 28 07:54:46 ubuntu kernel: [ 3032] 03032 592 17 45056 0 0 dumb-init
Jan 28 07:54:46 ubuntu kernel: [ 3061] 03061 13873 414 98304 0 0 nginx
Jan 28 07:54:46 ubuntu kernel: [ 3178] 03178 62812 1355 151552 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: [ 3179] 333179 68685 22257 331776 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: [ 3180] 333180 68685 22615 331776 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: [ 3181] 333181 68676 22112 331776 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: [ 3182] 333182 68769 22928 331776 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: [ 3183] 333183 68756 22658 335872 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: [ 3184] 333184 68684 21680 331776 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: [ 3185] 333185 68675 23880 339968 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: [ 3186] 333186 20657 7221 147456 0 0 nginx
Jan 28 07:54:46 ubuntu kernel: [ 3187] 333187 20657 7205 147456 0 0 nginx
Jan 28 07:54:46 ubuntu kernel: 0 26798 4266 1072 73728 0 0 systemd
Jan 28 07:54:46 ubuntu kernel: 0 26799 42452 1063 98304 0 0 (sd-pam)
Jan 28 07:54:46 ubuntu kernel: 0 26958 1962 595 53248 0 0 screen
Jan 28 07:54:46 ubuntu kernel: 0 26959 1909 461 49152 0 0 bash
Jan 28 07:54:46 ubuntu kernel: 0 31512 73894 759 163840 0 0 packagekitd
Jan 28 07:54:46 ubuntu kernel: 0 38255 3036 3029 61440 0 -1000 atop
Jan 28 07:54:46 ubuntu kernel: 0 63847 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 63854 654 17 45056 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 63868 1253 83 49152 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 33 63875 38154 17803 282624 0 0 php
Jan 28 07:54:46 ubuntu kernel: 0 64180 723 219 49152 0 0 apt.systemd.dai
Jan 28 07:54:46 ubuntu kernel: 0 64184 723 430 45056 0 0 apt.systemd.dai
Jan 28 07:54:46 ubuntu kernel: 0 64213 4586 1797 69632 0 0 apt-get
Jan 28 07:54:46 ubuntu kernel: 0 64470 4586 1063 69632 0 0 apt-get
Jan 28 07:54:46 ubuntu kernel: 0 64484 723 223 40960 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64485 723 434 49152 0 0 update-motd-upd
Jan 28 07:54:46 ubuntu kernel: 0 64499 45260 21926 356352 0 0 apt-check
Jan 28 07:54:46 ubuntu kernel: 0 64553 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64554 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64555 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64556 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64557 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64558 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64559 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64560 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64561 1108 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64569 654 16 45056 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64570 654 18 45056 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64571 654 17 45056 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64572 654 18 49152 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64573 654 17 40960 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64574 654 17 45056 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64575 654 18 40960 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64576 654 17 40960 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64577 654 17 40960 0 0 sh
Jan 28 07:54:46 ubuntu kernel: 0 64578 1253 83 49152 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 0 64579 1253 82 45056 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 0 64580 1253 82 45056 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 0 64581 1253 82 53248 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 0 64584 1253 83 53248 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 0 64585 1253 83 45056 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 0 64586 1253 83 53248 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 0 64587 1253 83 49152 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 0 64589 1253 82 45056 0 0 sudo
Jan 28 07:54:46 ubuntu kernel: 33 64602 30454 10268 221184 0 0 php
Jan 28 07:54:46 ubuntu kernel: 33 64603 30454 10267 229376 0 0 php
Jan 28 07:54:46 ubuntu kernel: 33 64604 30454 10268 221184 0 0 php
Jan 28 07:54:46 ubuntu kernel: 33 64605 30454 10268 221184 0 0 php
Jan 28 07:54:46 ubuntu kernel: 33 64608 30454 10268 229376 0 0 php
Jan 28 07:54:46 ubuntu kernel: 33 64609 30454 10268 225280 0 0 php
Jan 28 07:54:46 ubuntu kernel: 33 64610 30454 10267 225280 0 0 php
Jan 28 07:54:46 ubuntu kernel: 33 64611 30454 10268 233472 0 0 php
Jan 28 07:54:46 ubuntu kernel: 33 64612 30454 10268 221184 0 0 php
Jan 28 07:54:46 ubuntu kernel: 0 64646 3658 310 61440 0 0 sshd
Jan 28 07:54:46 ubuntu kernel: 0 64648 2550 610 57344 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64649 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64650 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64651 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64652 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64653 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64654 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64655 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64656 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64657 1100 83 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64659 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64660 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64661 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64662 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64663 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64664 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64665 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64666 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64667 1095 80 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64670 3658 317 57344 0 0 sshd
Jan 28 07:54:46 ubuntu kernel: 0 64673 3658 335 57344 0 0 sshd
Jan 28 07:54:46 ubuntu kernel: 0 64675 1089 77 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64676 1089 77 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64677 1089 77 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64678 1089 77 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64679 1089 77 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64680 1089 77 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64681 1078 70 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64682 1089 77 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64683 1089 77 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64685 3658 349 61440 0 0 sshd
Jan 28 07:54:46 ubuntu kernel: 0 64686 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64687 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64688 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64689 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64690 1049 67 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64691 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64692 1078 70 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64693 1049 67 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64694 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64699 990 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64700 1049 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64701 3658 298 61440 0 0 sshd
Jan 28 07:54:46 ubuntu kernel: 0 64702 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64703 990 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64704 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64705 1049 67 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64706 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64707 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64708 1078 70 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64709 990 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64710 1049 67 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64711 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64712 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64713 1049 68 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64714 2270 507 53248 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64715 1049 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64716 1078 69 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64717 990 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64718 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64719 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64720 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64721 990 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64722 1078 70 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64723 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64724 986 65 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64725 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64726 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64727 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64728 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64729 986 65 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64730 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64731 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64732 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64733 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64734 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64735 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64736 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64737 2270 478 53248 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64738 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64739 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64740 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64741 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64743 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64745 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64746 990 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64747 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64748 986 65 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64749 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64750 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64751 986 65 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64752 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64754 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64755 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64756 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64757 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64758 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64760 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64761 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64762 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64763 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64764 986 66 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64765 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64766 986 65 49152 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64767 986 66 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64768 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 33 64769 62812 1352 151552 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: 0 64773 3658 201 53248 0 0 sshd
Jan 28 07:54:46 ubuntu kernel: 0 64775 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64776 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64777 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64779 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64780 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64781 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64782 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64783 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64784 2270 414 53248 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64785 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 33 64786 62812 1352 151552 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: 0 64787 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64788 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64789 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64790 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 33 64791 62812 1352 151552 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: 0 64792 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64793 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64794 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64795 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64796 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64797 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64798 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64799 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64800 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64801 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64802 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64803 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64804 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64805 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64806 957 65 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64807 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64808 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64809 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64810 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64811 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64812 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64813 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64814 2716 150 49152 0 0 sshd
Jan 28 07:54:46 ubuntu kernel: 0 64815 62812 1353 151552 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: 0 64816 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64818 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64819 62812 1353 151552 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: 0 64820 62812 1353 151552 0 0 php-fpm7.4
Jan 28 07:54:46 ubuntu kernel: 0 64821 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64822 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64823 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64824 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64826 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64827 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64828 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: 0 64829 957 64 45056 0 0 cron
Jan 28 07:54:46 ubuntu kernel: oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=init.scope,mems_allowed=0,global_oom,task_memcg=/system.slice/docker-f1b9d049f31e7d6eb66d2cb6e5413028060be77b7f5335dea381b5feaee1a071.scope,task=mysqld,pid=1530,uid=999
Jan 28 07:54:46 ubuntu kernel: Out of memory: Killed process 1530 (mysqld) total-vm:1753796kB, anon-rss:589372kB, file-rss:0kB, shmem-rss:0kB, UID:999 pgtables:1536kB oom_score_adj:0
```
考虑设置swap，测试一下是否可以避免IOPS一直高位导致死机的问题
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