mysql啟動失敗又一例
搭的wordpress報錯：
後臺用的mysql，之前也崩過，原因是虛擬記憶體耗盡，通過增加swap空間最終讓資料重新啟動。
但僅過一晚上，資料庫再次崩潰。看來要查一查是什麼程式耗盡資源。
執行top，切到VIRT列，以虛擬記憶體使用量進行排序。
[email protected]:/var/log/mysql# top
top - 10:51:24 up 81 days, 19:52, 2 users, load average: 1.47, 1.14, 0.89
Tasks: 774 total, 3 running, 770 sleeping, 0 stopped, 1 zombie
%Cpu(s): 1.8 us, 32.4 sy, 0.0 ni, 36.4 id, 28.0 wa, 0.0 hi, 1.4 si, 0.0 st
KiB Mem: 1026284 total, 941336 used, 84948 free, 188 buffers
KiB Swap: 3952632 total, 3952632 used, 0 free, 4152 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
9065 root 20 0 328m 50m 0 S 2.0 5.0 28:07.37 java
26155 hyang0 20 0 170m 24m 660 S 0.0 2.4 0:03.38 check-new-relea
28176 hyang0 20 0 170m 24m 624 S 0.0 2.4 0:04.07 check-new-relea
26782 hyang0 20 0 170m 23m 516 S 0.0 2.3 0:03.35 check-new-relea
25522 hyang0 20 0 169m 23m 652 S 0.0 2.3 0:04.92 check-new-relea
27531 hyang0 20 0 170m 23m 704 S 0.0 2.3 0:05.11 check-new-relea
28832 hyang0 20 0 169m 23m 516 S 0.0 2.3 0:07.84 check-new-relea
19835 hyang0 20 0 170m 22m 604 S 0.0 2.3 0:03.34 check-new-relea
20530 hyang0 20 0 170m 22m 704 S 0.0 2.2 0:03.81 check-new-relea
24742 hyang0 20 0 168m 21m 848 S 0.0 2.2 0:04.99 check-new-relea
11952 hyang0 20 0 170m 21m 856 S 0.0 2.1 0:03.28 check-new-relea
23943 hyang0 20 0 170m 21m 748 S 0.0 2.1 0:04.97 check-new-relea
6850 hyang0 20 0 168m 20m 876 S 0.0 2.0 0:03.00 check-new-relea
17144 hyang0 20 0 170m 19m 648 S 0.0 1.9 0:03.24 check-new-relea
18423 hyang0 20 0 170m 19m 640 S 0.0 1.9 0:03.23 check-new-relea
3105 hyang0 20 0 106m 18m 1796 S 41.5 1.9 1:40.46 check-new-relea
2387 hyang0 20 0 170m 18m 624 S 0.0 1.9 0:03.18 check-new-relea
發現有幾十個check-new-relea的程序，每個佔用170多兆虛擬記憶體。再檢視swap使用量：
[email protected]:/var/log/mysql# sudo swapon -s Filename Type Size Used Priority /dev/sda5 partition 1046524 1046524 -1 /dev/sdd1 partition 29061082906108 -2
像上次一樣，已經耗盡。在網上也找到類擬的問題：
下面就是處理這些程序了。用pstree, pgrep查詢這些程序，確認不會誤殺，pkill幹掉這些程序。
[email protected]:~# pgrep check-new- -l 669 check-new-relea 1091 check-new-relea 1762 check-new-relea 1977 check-new-relea 2197 check-new-relea 2387 check-new-relea 2715 check-new-relea 2937 check-new-relea 3030 check-new-relea 3395 check-new-relea 3635 check-new-relea 3722 check-new-relea
[email protected]:~# pkill check-new-
[email protected]:~# pgrep check-new- -l
[email protected]:~#
再次通過top 和 swapon工具檢視資源情況，已經都釋放了。mysql 再次復活。
[email protected]:/var/log/mysql# sudo swapon -s Filename Type Size Used Priority /dev/sda5 partition 1046524 113876 -1 /dev/sdd1 partition 2906108 144480 -2 [email protected]-xxzx-svr:/var/log/mysql# /etc/init.d/mysql start Rather than invoking init scripts through /etc/init.d, use the service(8) utility, e.g. service mysql start Since the script you are attempting to invoke has been converted to an Upstart job, you may also use the start(8) utility, e.g. start mysql mysql start/running, process 5009 [email protected]-xxzx-svr:/var/log/mysql#