Goto: MongoDB Modify Ulimit

Transferred from: http://blog.yucanlin.cn/2015/03/23/mongodb-%E4%BF%AE%E6%94%B9-ulimit/

MongoDB Modify Ulimit

It all comes from the warning of MongoDB.

1	** WARNING: soft rlimits too low. rlimits set to 4096 processes, 64000 files. Number of processes should be at least 32000 : 0.5 times number of files.

It is not difficult to modify ulimit, but there are still many pits. MongoDB Official document http://docs.mongodb.org/manual/reference/ulimit/#memory-size, although the method is given, but the Linux ulimit is user-related, So the practice is not reliable.

The correct approach is to modify the/etc/security/limits.conf file, which is a man document that can be viewed by the man limit.conf file. First give a sample:

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<domain><type><item><value>            *               soft    core            0            *               hard    nofile          512            @student        hard    nproc           20            @faculty        soft    nproc           20            @faculty        hard    nproc           50            ftphard    nproc           0            @student        -       maxlogins       4            :123            hard    cpu             5000            @500:           soft    cpu             10000            600:700         hard    locks           10

According to the instructions, we add the following values from the recommended values in the MongoDB document. One requirement is that Nproc be larger than 0.5nofile.

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mongod soft fsize unlimited mongod hard fsize unlimited mongod soft cpu unlimited mongod hard cpu unlimited mongod soft as unlimited mongod hard as unlimited mongod soft nofile 64000 mongod hard nofile 64000 mongod soft nproc 64000 mongod hard nproc 64000

It's done after the reboot. Note here, please indicate the user, do not use * instead. Users who start MongoDB will fill in the user, you can use the PS command query.

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[[email protected] ~]$ ps -ef | grep mongod mongod      945      1  1 12:11?         00:00:14 /usr/bin/mongod -f /etc/mongod .conf yucanlin   3040   2649  0 12:32 pts /0     00:00:00 grep --color=auto mongod

In addition, if you want to query Mongod's limits, you can use the following command. 945 of them are PID. The above PS command query is obtained.

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[[email protected] ~]$ cat /proc/945/limits Limit                     Soft Limit           Hard Limit           Units     Max cpu time unlimited            unlimited            seconds   Max file size             unlimited            unlimited            bytes     Max data size             unlimited            unlimited            bytes     Max stack size            8388608              unlimited            bytes     Max core file size        0                    unlimited            bytes     Max resident set unlimited            unlimited            bytes     Max processes             64000                64000                processes Max open files            64000                64000                files     Max locked memory         65536                65536                bytes     Max address space         unlimited            unlimited            bytes     Max file locks            unlimited            unlimited            locks     Max pending signals       7859                 7859                 signals   Max msgqueue size         819200               819200               bytes     Max nice priority         0                    0                    Max realtime priority     0                    0                    Max realtime timeout      unlimited            unlimited            us

Yucanlin March 23, 2015 computer 2 Comments

Goto: MongoDB Modify Ulimit