postgresql設置max_connections太大無法啟動
2021-10-11 15:10:30

在postgres中，當max_connect設置過大，啟動的時候會報錯:

FATAL: ?could not create semaphores: No space left on device

創(chuàng)建semaphores時空間參數(shù)不夠，查詢官網(wǎng)，有這么一段解釋：

HINT: ?This error does *not* mean that you have run out of disk space. ?It occurs when either the system limit for the maximum number of semaphore sets (SEMMNI), or the system wide maximum number of semaphores (SEMMNS), would be exceeded. ?You need to raise the respective kernel parameter. ?Alternatively, reduce PostgreSQL's consumption of semaphores by reducing its max_connections parameter.
The PostgreSQL documentation contains more information about configuring your system for PostgreSQL.
解決的方法是改小max_connect，當業(yè)務不允許的情況下，修改內(nèi)核參數(shù)，max_connect相關的內(nèi)核參數(shù)有：

?

?

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?下面介紹如何修改內(nèi)核參數(shù)

# ipcs -ls
 
------ Semaphore Limits --------
max number of arrays = 1280
max semaphores per array = 50100
max semaphores system wide = 64128000
max ops per semop call = 50100
semaphore max value = 32767
 
 
# cat  /proc/sys/kernel/sem
SEMMSL   SEMMNS         SEMOPM  SEMMNI
50100   128256000       50100   2560