mongodb 3.2.x 启动 Warning 错误处理

Posted 2021-01-19 数据库探索

[[email protected] data1]# mongod --dbpath=/data/data1/mongodb_data/  --directoryperdb
** WARNING: You are running this process as the root user, which is not recommended.
** WARNING: You are running on a NUMA machine.
**          We suggest launching mongod like this to avoid performance problems:
**              numactl --interleave=all mongod [other options]
** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is ‘always‘.
**        We suggest setting it to ‘never‘
** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is ‘always‘.
**        We suggest setting it to ‘never‘
** WARNING: soft rlimits too low. rlimits set to 30000 processes, 65530 files. Number of processes should be at least 32765 : 0.5 times number of files.



[[email protected] data1]# echo never>/sys/kernel/mm/transparent_hugepage/enabled
[[email protected] data1]# echo never>/sys/kernel/mm/transparent_hugepage/defrag
[[email protected] data1]# cat /etc/security/limits.conf
#--------------------------------------------------
#此处经过测试知：只要 nproc * 2【0.5倍的nofile】 >= nofile > 32767【推荐】
* - nproc  65538
* - nofile 65536
#--------------------------------------------------

[[email protected] data1]# numactl --interleave=all mongod --dbpath=/data/data1/mongodb_data/ --directoryperdb &
[1] 3847
[[email protected] data1]# 2018-11-12T11:35:49.699+0800 I CONTROL  [initandlisten] MongoDB starting : pid=3847 port=27017 dbpath=/data/data1/mongodb_data/ 64-bit host=restore1
2018-11-12T11:35:49.699+0800 I CONTROL  [initandlisten] db version v3.2.4
... ...

 

mongodb shell 编写js脚本：循环遍历

var cols=db.getCollectionNames();
for (var i=0 ;i<cols.length;i++) { 
　　var n=cols[i]; 
　　var v=db.getCollection(n).count(); 
　　print (n.pad(30,true) + " : " + v); 
}