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Status Future consideration
Workspace z/OS
Categories Container Extensions (zCX)
Created by Guest
Created on Dec 10, 2021

RELATED IDEAS

Change vm.max_map_count on zCX Kernel

To allow running a cluster of ELK (ElasticSearch) containers in a zCX configuration with SWARM, it is necessary to adjust the vm.max_map_count parameter in /etc/sysctl.conf from 65530 to 262144 on zCX Linux system. Without this adjustment, when starting the elasticsearch container with the multi-node configuration, this error occurs:

ERROR: [3] bootstrap checks failed. You must address the points described in the following [3] lines before starting Elasticsearch.
bootstrap check failure [1] of [3]: memory locking requested for elasticsearch process but memory is not locked
bootstrap check failure [2] of [3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
bootstrap check failure [3] of [3]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk
ERROR: Elasticsearch did not exit normally - check the logs at /usr/share/elasticsearch/logs/elk-cluster.log

According to ElasticSearch documentation, this adjustment is necessary to run in a cluster:

https://www.elastic.co/guide/en/elasticsearch/reference/current/vm-max-map-count.html
https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html

Idea priority High

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