MongoDB 3.x内存限制配置

修改后的配置：/etc/mongod.conf

# Where and how to store data.
storage:
  dbPath: /var/lib/mongo
  #dbPath: /mongodata 
  journal:
    enabled: true
#  engine:
  mmapv1:
    smallFiles: true
  wiredTiger:
    engineConfig:
      configString : cache_size=512M

其实重点就是下面一项，配置之后，重启mongodb生效：

wiredTiger:
    engineConfig:
      configString : cache_size=512M