Prevent elasticsearch from being killed by OOM killer -


i'm new elasticsearch , i'm guessing way configured server sub-optimal since i'm running problem oom killer killing elasticsearch/java process after short while.this avoided having server configured correctly. please point out in configuration needs changed smooth operation of es?

on both of these servers (which clustered), come es/java process having been killed.

here current setup:

===========================================

server 1 (frontend server) server has 8gb of ram , running gunicorn, flask, , django

elasticsearch.yml:

node.master: true node.data: true bootstrap.mlockall: true

/etc/default/elasticsearch

es_heap_size=5g max_open_files=65535 max_locked_memory=unlimited

===========================================

server 2 (dedicated elasticsearch server) 8gb ram , no other applications running

elasticsearch.yml:

node.master: false node.data: true bootstrap.mlockall: true

/etc/default/elasticsearch

es_heap_size=5g max_open_files=65535 max_locked_memory=unlimited

===========================================

in elasticsearch.yml file, see line says "you should make sure elasticsearch process allowed lock memory, eg. using ulimit -l unlimited" haven't done enable that. need take action here?

if try typing in, get...

myuser@es1:~$ sudo ulimit -l unlimited sudo: ulimit: command not found

here have done lock memory on es nodes, version 5.4.0 on redhat/centos 7 (it work on other distributions if use systemd).

you must make change in 4 different places:

1) /etc/sysconfig/elasticsearch

on sysconfig: /etc/sysconfig/elasticsearch should have:

es_java_opts="-xms4g -xmx4g"  max_locked_memory=unlimited

(replace 4g half available ram recommended here)

2) /etc/security/limits.conf

on security limits config: /etc/security/limits.conf should have

elasticsearch soft memlock unlimited elasticsearch hard memlock unlimited

3) /usr/lib/systemd/system/elasticsearch.service

on service script: /usr/lib/systemd/system/elasticsearch.service should uncomment:

limitmemlock=infinity

you should systemctl daemon-reload after changing service script

4) /etc/elasticsearch/elasticsearch.yml

on elasticsearch config finally: /etc/elasticsearch/elasticsearch.yml should add:

bootstrap.memory_lock: true

thats it, restart node , ram locked, should notice major performance improvement.


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