最近服務(wù)器突然有一段時(shí)間：ssh連不上，查看日志發(fā)現(xiàn)有大有問(wèn)題，去網(wǎng)上查了，發(fā)現(xiàn)是內(nèi)存不夠了，可以使用以為網(wǎng)友提供的添加一個(gè)1Gswap分區(qū)，原服務(wù)器確實(shí)已經(jīng)刪除了swap分區(qū)。

Mar 20 16:19:23 localhost kernel: Mem-info:

Mar 20 16:19:23 localhost kernel: DMA per-cpu:

Mar 20 16:19:23 localhost kernel: cpu 0 hot: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 0 cold: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 1 hot: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 1 cold: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 2 hot: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 2 cold: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 3 hot: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 3 cold: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 4 hot: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 4 cold: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 5 hot: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 5 cold: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 6 hot: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 6 cold: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 7 hot: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: cpu 7 cold: high 0, batch 1 used:0

Mar 20 16:19:23 localhost kernel: DMA32 per-cpu: empty

Mar 20 16:19:23 localhost kernel: Normal per-cpu:

Mar 20 16:19:23 localhost kernel: cpu 7 cold: high 62, batch 15 used:14

Mar 20 16:19:23 localhost kernel: Free pages: 315072kB (472kB HighMem)

Mar 20 16:19:23 localhost kernel: Active:1969387 inactive:0 dirty:0 writeback:0 unstable:0 free:78768 slab:11435 mapped-file:3 mapped-anon:1970742 pagetables:6141

Mar 20 16:19:23 localhost kernel: DMA free:12036kB min:68kB low:84kB high:100kB active:0kB inactive:0kB present:16384kB pages_scanned:0 all_unreclaimable? yes

Mar 20 16:19:23 localhost kernel: lowmem_reserve[]: 0 0 880 10224

Mar 20 16:19:23 localhost kernel: DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no

Mar 20 16:19:23 localhost kernel: lowmem_reserve[]: 0 0 880 10224

Mar 20 16:19:23 localhost kernel: Normal free:302564kB min:3756kB low:4692kB high:5632kB active:457996kB inactive:0kB present:901120kB pages_scanned:76768585 all_unreclaimable? yes

Mar 20 16:19:23 localhost kernel: lowmem_reserve[]: 0 0 0 74752

Mar 20 16:19:23 localhost kernel: HighMem free:472kB min:512kB low:10492kB high:20472kB active:7419752kB inactive:0kB present:9568256kB pages_scanned:33425047 all_unreclaimable? yes

Mar 20 16:19:23 localhost kernel: lowmem_reserve[]: 0 0 0 0

Mar 20 16:19:23 localhost kernel: DMA: 11*4kB 13*8kB 11*16kB 12*32kB 9*64kB 6*128kB 5*256kB 5*512kB 2*1024kB 0*2048kB 1*4096kB = 12036kB

Mar 20 16:19:23 localhost kernel: DMA32: empty

Mar 20 16:19:23 localhost kernel: Normal: 41*4kB 3026*8kB 2549*16kB 2899*32kB 1702*64kB 241*128kB 5*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 302564kB

Mar 20 16:19:23 localhost kernel: HighMem: 46*4kB 0*8kB 0*16kB 1*32kB 0*64kB 0*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 472kB

Mar 20 16:19:23 localhost kernel: 1095 pagecache pages

Mar 20 16:19:23 localhost kernel: Swap cache: add 0, delete 0, find 0/0, race 0+0

Mar 20 16:19:23 localhost kernel: Free swap = 0kB

Mar 20 16:19:23 localhost kernel: Total swap = 0kB

Mar 20 16:19:23 localhost kernel: Free swap: 0kB

Mar 20 16:19:23 localhost kernel: 2621440 pages of RAM

Mar 20 16:19:23 localhost kernel: 2392064 pages of HIGHMEM

Mar 20 16:19:23 localhost kernel: 548922 reserved pages

Mar 20 16:19:23 localhost kernel: 5664 pages shared

Mar 20 16:19:23 localhost kernel: 0 pages swap cached

Mar 20 16:19:23 localhost kernel: 0 pages dirty

Mar 20 16:19:23 localhost kernel: 0 pages writeback

Mar 20 16:19:23 localhost kernel: 3 pages mapped

Mar 20 16:19:23 localhost kernel: 11435 pages slab

Mar 20 16:19:23 localhost kernel: 6141 pages pagetables

Mar 20 16:19:23 localhost kernel: Out of memory: Killed process 15967, UID 27, (mysqld).

紅色標(biāo)記為：目前判斷為故障發(fā)生時(shí)，內(nèi)核還處于可運(yùn)行狀態(tài)，但由于內(nèi)存不足，觸發(fā)了OOM killer機(jī)制，但一直在殺進(jìn)程又一直有新的進(jìn)程創(chuàng)建，導(dǎo)致了死循環(huán)。

根源是內(nèi)存不夠，可以考慮臨時(shí)添加一個(gè)swap分區(qū)，因?yàn)槲冶旧砭蜎](méi)有，所以添加，這是臨時(shí)的，想根本解決就得添加內(nèi)存了。

添加swap分區(qū)：

1.加1G ，swap分區(qū)

dd if=/dev/zero of=/opt/swapfile bs=1M count=1024

#mkswap /opt/swapfile

#swapon /opt/swapfile

#swapon -s

Filename Type Size Used Priority

/dev/mapper/VolGroup00-LogVol00 partition 2097144 87352 -1

/opt/swapfile file 2097144 0 -2

2.在fstab增加相關(guān)記錄，否則重啟就沒(méi)了

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