场景:恢复一个22TB数据的mongodb实例的时候.
加入mongodb集群中，自动恢复数据实例的过程中。mongodb的系统日志报了如下错误:
修改linux操作系统的limit的参数文件，如下:
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[root@ClbMongo01 home]# cat /etc/security/limits.conf
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......
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* - nproc 102400
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* - nofile 102400
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......
保证打开连接数，不是瓶颈。
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[root@ClbMongo01 home]# ulimit -a
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core file size (blocks, -c) 0
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data seg size (kbytes, -d) unlimited
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scheduling priority (-e) 0
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file size (blocks, -f) unlimited
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pending signals (-i) 514844
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max locked memory (kbytes, -l) 64
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max memory size (kbytes, -m) unlimited
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open files (-n) 102400 //打开文件大小为:102400
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pipe size (512 bytes, -p) 8
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POSIX message queues (bytes, -q) 819200
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real-time priority (-r) 0
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stack size (kbytes, -s) 10240
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cpu time (seconds, -t) unlimited
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max user processes (-u) 102400
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virtual memory (kbytes, -v) unlimited
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file locks (-x) unlimited
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