elasticsearch start Frequently Asked Questions Summary

一、max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

Small number of simultaneously open files per process maximum, can be viewed using the following command

ulimit -Hn
ulimit -Sn

Solution:

/Etc/security/limits.conf modify the file, add the following two lines at the end of

*               soft    nofile          65536
*               hard    nofile          65536

After switching users to log in again, make configuration changes to take effect.

二、max number of threads [1868] for user [es] is too low, increase to at least [4096]

Use the following command to view, my side of the environment should be the 1868, 4096 changed the line to see command is as follows *

ulimit -Hu
ulimit -Su

Solution:

/Etc/security/limits.conf modify the file, add the following two lines at the end of

*               soft    nproc           4096
*               hard    nproc           4096

same,

After switching users to log in again, make configuration changes to take effect.

三、max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

Modify /etc/sysctl.conf file

vi /etc/sysctl.conf

Adding at the end of a line (if present value is modified)

vm.max_map_count=262144

Changes to take effect

sysctl -p