I played with the elasticsearch 5.3.0 binary environment today and found that it failed to start the es service, so I checked the logs in the logs/ directory of the deployment directory and found the following error:
#View the log, the log path is generally under the deployment directory logs/ cat . /logs/elasticsearch.log #Error log [ 2022-05-30T09 : 43 : 27,255 ] [ ERROR ][ oebBootstrap ][PBelckP] node validation exception bootstrap checks failed max file descriptors [ 65535 ] for elasticsearch process is too low, increase to at least [ 65536 ] memory locking requested for elasticsearch process but memory is not locked max virtual memory areas vm.max_map_count [ 65530 ] is too low, increase to at least [ 262144 ]
So I went to Google and found that some kernel configuration parameters need to be adjusted. The following will explain the solutions one by one.
💡Cause : The maximum file descriptor  of the es process is too low.
📣Solution : Switch to the root user, edit the limits.conf file, and add the following: (soft nproc and hard nproc can also be set to 65536).
vim /etc/security/limits.conf root soft nofile 65535 root hard nofile 65535 # Add the following: *soft nofile 65536 *hard nofile 65536
* soft nofile 65536
* hard nofile 65536
* soft nproc 2048
* hard nproc 4096
① soft nproc: the maximum number of open file descriptors (soft limit)
② hard nproc: the maximum number of open file descriptors (hard limit)
③ soft nofile: the maximum number of processes available to a single user (soft limit)
④ hard nofile: the maximum number of processes available to a single user (hard limit)
Note : * represents all user names in Linux
Save, log out, and log in again to take effect
💡Cause : The es process requested a memory lock, but failed to lock the memory.
📣Solution : Switch to the root user, edit the limits.conf configuration file, and add something like the following:
vim /etc/security/limits.conf # Add the following: * soft memlock unlimited * hard memlock unlimited
💡Cause : es max virtual memory is too low.
📣Solution : Switch to the root user and modify the configuration file sysctl.conf.
vim /etc/sysctl.conf # Add the following configuration: vm.max_map_count = 655360 #Save and exit, and execute the command: sysctl -p
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