groupadd esgroup
useradd esroot -g esgroup -p 0p-0p-0p-
chown -R esroot:esgroup /usr/local/elasticsearch-7.17.4
su esroot
/usr/local/elasticsearch-7.17.4/bin/elasticsearch

/usr/local/elasticsearch-7.17.4/config/elasticsearch.yml

node.name: node-1
network.host: 0.0.0.0
#network.publish_host: 0.0.0.0
http.port: 9963
discovery.seed_hosts: ["127.0.0.1"]
cluster.initial_master_nodes: ["node-1"]

/usr/local/elasticsearch-7.17.4/config/jvm.options

cat /proc/meminfo|grep MemTotal
-Xms4g
-Xmx4g

/etc/sysctl.conf

vm.max_map_count = 262144
sysctl -p
sysctl -a|grep vm.max_map_count

/etc/environment

export ES_JAVA_HOME=/usr/local/elasticsearch-7.17.4/jdk

/etc/profile

export ES_JAVA_HOME=/usr/local/elasticsearch-7.17.4/jdk
source /etc/profile

/etc/security/limits.conf

*                soft    nofile          65536
*                hard    nofile          65536
#End
ulimit -Hn
ulimit -Sn