最近幫別人做的一個(gè)項(xiàng)目機(jī)器上面跑MySQL老是隔一段時(shí)間就自動(dòng)停了。剛開(kāi)始以為是以外停止，也沒(méi)注意，就手動(dòng)再啟動(dòng)。可是過(guò)了沒(méi)兩天又停止了。

后來(lái)仔細(xì)查了查mysqld的日志：

2020-05-27T10:15:12.569342Z 0 [System] [MY-010116] [Server] /usr/libexec/mysqld (mysqld 8.0.17) starting as process 19493
2020-05-27T10:15:14.448256Z 0 [System] [MY-010229] [Server] Starting crash recovery...
2020-05-27T10:15:14.475411Z 0 [System] [MY-010232] [Server] Crash recovery finished.
2020-05-27T10:15:14.691345Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2020-05-27T10:15:15.677386Z 0 [System] [MY-010931] [Server] /usr/libexec/mysqld: ready for connections. Version: '8.0.17'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  Source distribution.
2020-05-27T10:15:15.951210Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/var/lib/mysql/mysqlx.sock' bind-address: '::' port: 33060
2020-05-27T11:26:19.955004Z 0 [System] [MY-010116] [Server] /usr/libexec/mysqld (mysqld 8.0.17) starting as process 19757
2020-05-27T11:26:20.181302Z 0 [ERROR] [MY-012681] [InnoDB] mmap(137363456 bytes) failed; errno 12
2020-05-27T11:26:20.181360Z 1 [ERROR] [MY-012956] [InnoDB] Cannot allocate memory for the buffer pool
2020-05-27T11:26:20.181379Z 1 [ERROR] [MY-012930] [InnoDB] Plugin initialization aborted with error Generic error.
2020-05-27T11:26:20.181401Z 1 [ERROR] [MY-010334] [Server] Failed to initialize DD Storage Engine
2020-05-27T11:26:20.181543Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2020-05-27T11:26:20.183642Z 0 [ERROR] [MY-010119] [Server] Aborting
2020-05-27T11:26:20.184163Z 0 [System] [MY-010910] [Server] /usr/libexec/mysqld: Shutdown complete (mysqld 8.0.17)  Source distribution.

上面顯示是Cannot allocate memory for the buffer pool，無(wú)法分配內(nèi)存給緩存池。馬上想到是內(nèi)存不足，這臺(tái)機(jī)器是1GB的內(nèi)存，還跑著 Nginx 和 PHP-FPM 。

使用 top 看了看 mysqld 占用的內(nèi)存達(dá)到了48% 。內(nèi)存占用還是蠻高的。

當(dāng)然了升級(jí)機(jī)器配置是比較好的辦法，但是畢竟經(jīng)費(fèi)有限。所以我們先給它加個(gè)swap交換空間：

dd if=/dev/zero of=/swapfile bs=1M count=2048
mkswap /swapfile
swapon /swapfile
systemctl restart mysqld

上面我們加了2GB的交換空間給機(jī)器。然后重啟 mysqld。再使用top看了看，發(fā)現(xiàn)交換空間漸漸被使用了。

睡了一覺(jué)起來(lái)一看，mysqld服務(wù)沒(méi)有再自動(dòng)停止，內(nèi)存占用已經(jīng)下降到22%，看了看錯(cuò)誤日志，也是空的。

嗯，看來(lái)還不錯(cuò)嘛。再觀察個(gè)幾天看看，沒(méi)問(wèn)題的話(huà)應(yīng)該就好了😎😎😎。

好了，到此這篇關(guān)于MySQL自動(dòng)停機(jī)的問(wèn)題處理的文章就介紹到這了,更多相關(guān)MySQL自動(dòng)停機(jī)處理內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！