mongodb 啓動 WARNING: soft rlimits too low, transparent_hugepage/enabled is 'always'. never

今天啓動mongodb的時候，以前一直沒注意，今天發現又warning，想整一整。

下面是告警

2019-09-05T12:00:55.271+0800 I  CONTROL  [initandlisten]
2019-09-05T12:00:55.271+0800 I  CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2019-09-05T12:00:55.271+0800 I  CONTROL  [initandlisten] **        We suggest setting it to 'never'
2019-09-05T12:00:55.271+0800 I  CONTROL  [initandlisten]
2019-09-05T12:00:55.271+0800 I  CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2019-09-05T12:00:55.271+0800 I  CONTROL  [initandlisten] **        We suggest setting it to 'never'
2019-09-05T12:00:55.271+0800 I  CONTROL  [initandlisten]
2019-09-05T12:00:55.271+0800 I  CONTROL  [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 15012 processes, 102400 files. Number of processes should be at least 51200 : 0.5 times number of files.

那咱們一個個來解決：

transparent_hugepage ，

上面2個問題能夠一塊兒解決：

echo never >/sys/kernel/mm/transparent_hugepage/enabled

echo never>/sys/kernel/mm/transparent_hugepage/defrag

soft rlimits too low

這個問題就是咱們不能單單把ulimit -n 那個文件句柄數打開，還得同時提高用戶可以使用線程數

解決辦法有幾種，這裏介紹一個比較快捷，能夠及時生效的：

修改 /etc/security/limits.conf 文件，末尾添加：

* soft noproc 65535
* hard noproc 65535

而後 執行一步 ulimit -u 65535

• 第一步是永久生效process
• 第二步是即時當前會話生效process