Redis: How to Increase File Descriptor Limits

Tags: November 25, 2016 8:06 PM


When you run redis server it complains can not set maximum open files because it has reached the OS max file descriptor limits. Here is the sample output.

$ ./bin/redis-server
28436:C 25 Nov 20:10:03.978 # Warning: no config file specified, using the default config. In order to specify a config file use ./bin/redis-server /path/to/redis.conf
28436:M 25 Nov 20:10:03.979 # You requested maxclients of 10000 requiring at least 10032 max file descriptors.
28436:M 25 Nov 20:10:03.979 # Server can't set maximum open files to 10032 because of OS error: Operation not permitted.
28436:M 25 Nov 20:10:03.979 # Current maximum open files is 4096. maxclients has been reduced to 4064 to compensate for low ulimit. If you need higher maxclients increase 'ulimit -n'.

When you try to increase the maximum file descriptor using ulimit as root by issuing sudo it returns an error.

$ sudo ulimit -n 65000
sudo: ulimit: command not found

Wow, WTF is that? ulimit is a shell built so giving sudo an instruction to run a command called ulimit will not work. It will the same as statement below.

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