Details
Description
On rhel 6.6 (mongodb was installed with rpm) the issue of ulimits, documentation says the following:
http://docs.mongodb.org/manual/reference/ulimit/#recommended-ulimit-settings
Every deployment may have unique requirements and settings; however, the following thresholds and settings are particularly important for mongod and mongos deployments:
-f (file size): unlimited
-t (cpu time): unlimited
-v (virtual memory): unlimited
-n (open files): 64000
-m (memory size): unlimited
-u (processes/threads): 64000
i.e open file and process ulimit (soft and hard) should be set to 64000.
In the mongod init script (/etc/init.d/mongod), the start function sets process ulimit to 32000:
\\# Recommended ulimit values for mongod or mongos
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\\# See http://docs.mongodb.org/manual/reference/ulimit/#recommended-settings
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#
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ulimit -f unlimited
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ulimit -t unlimited
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ulimit -v unlimited
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ulimit -n 64000
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ulimit -m unlimited
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ulimit -u 32000
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Here is a link to git :
https://github.com/mongodb/mongo/blob/400dabd20809c561d8de21438d4bb7c682129641/rpm/init.d-mongod#L60
While documentation recommends setting ulimit to 64000.
It is possible this is a documentation bug. If so, please move to DOCS.
Additionally, if /etc/security/limits.d/99-mongodb-nproc.conf file is created (as documentation recommends):
mongod soft nproc 64000
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mongod hard nproc 64000
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mongod soft nofile 64000
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mongod hard nofile 64000
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Then the ulimit set by the init script will be run over by the ulimit of 99-mongodb-nproc.conf file, and the ulimit will be set to the recommended.
Attachments
Issue Links
- related to
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DOCS-2862 Update ulimits documentation
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- Closed
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