OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
[2019-11-04T00:12:07,213][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-1] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:163) ~[elasticsearch-7.4.2.jar:7.4.2]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:150) ~[elasticsearch-7.4.2.jar:7.4.2]
    at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-7.4.2.jar:7.4.2]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:125) ~[elasticsearch-cli-7.4.2.jar:7.4.2]
    at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-7.4.2.jar:7.4.2]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:115) ~[elasticsearch-7.4.2.jar:7.4.2]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-7.4.2.jar:7.4.2]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
    at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:105) ~[elasticsearch-7.4.2.jar:7.4.2]
    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:172) ~[elasticsearch-7.4.2.jar:7.4.2]
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:349) ~[elasticsearch-7.4.2.jar:7.4.2]
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:159) ~[elasticsearch-7.4.2.jar:7.4.2]
    ... 6 more

wget https://download.java.net/java/GA/jdk11/13/GPL/openjdk-11.0.1_linux-x64_bin.tar.gz

tar -xzvf jdk-11.0.4_linux-x64_bin.tar.gz /opt/

vi /home/elsearch/elasticsearch-7.4.2/bin/elasticsearch

#!/bin/bash

# CONTROLLING STARTUP:
#
# This script relies on a few environment variables to determine startup
# behavior, those variables are:
#
#   ES_PATH_CONF -- Path to config directory
#   ES_JAVA_OPTS -- External Java Opts on top of the defaults set
#
# Optionally, exact memory values can be set using the `ES_JAVA_OPTS`. Note that
# the Xms and Xmx lines in the JVM options file must be commented out. Example
# values are "512m", and "10g".
#
#   ES_JAVA_OPTS="-Xms8g -Xmx8g" ./bin/elasticsearch

# 配置自己的jdk11
export JAVA_HOME=/home/elsearch/jdk-11.0.1
export PATH=$JAVA_HOME/bin:$PATH

source "`dirname "$0"`"/elasticsearch-env

if [ -z "$ES_TMPDIR" ]; then
  ES_TMPDIR=`"$JAVA" -cp "$ES_CLASSPATH" org.elasticsearch.tools.launchers.TempDirectory`
fi

ES_JVM_OPTIONS="$ES_PATH_CONF"/jvm.options
JVM_OPTIONS=`"$JAVA" -cp "$ES_CLASSPATH" org.elasticsearch.tools.launchers.JvmOptionsParser "$ES_JVM_OPTIONS"`
ES_JAVA_OPTS="${JVM_OPTIONS//\$\{ES_TMPDIR\}/$ES_TMPDIR}"

# 添加jdk判断
if [ -x "$JAVA_HOME/bin/java" ]; then
        JAVA="/home/elsearch/jdk-11.0.1/bin/java"
else
        JAVA=`which java`
fi

# manual parsing to find out, if process should be detached
if ! echo $* | grep -E ‘(^-d |-d$| -d |--daemonize$|--daemonize )‘ > /dev/null; then
  exec     "$JAVA"     $ES_JAVA_OPTS     -Des.path.home="$ES_HOME"     -Des.path.conf="$ES_PATH_CONF"     -Des.distribution.flavor="$ES_DISTRIBUTION_FLAVOR"     -Des.distribution.type="$ES_DISTRIBUTION_TYPE"     -Des.bundled_jdk="$ES_BUNDLED_JDK"     -cp "$ES_CLASSPATH"     org.elasticsearch.bootstrap.Elasticsearch     "$@"
else
  exec     "$JAVA"     $ES_JAVA_OPTS     -Des.path.home="$ES_HOME"     -Des.path.conf="$ES_PATH_CONF"     -Des.distribution.flavor="$ES_DISTRIBUTION_FLAVOR"     -Des.distribution.type="$ES_DISTRIBUTION_TYPE"     -Des.bundled_jdk="$ES_BUNDLED_JDK"     -cp "$ES_CLASSPATH"     org.elasticsearch.bootstrap.Elasticsearch     "$@"     <&- &
  retval=$?
  pid=$!
  [ $retval -eq 0 ] || exit $retval
  if [ ! -z "$ES_STARTUP_SLEEP_TIME" ]; then
    sleep $ES_STARTUP_SLEEP_TIME
  fi
  if ! ps -p $pid > /dev/null ; then
    exit 1
  fi
  exit 0
fi

exit $?

# 创建用户组
groupadd elsearch

# 创建用户，-p : 登录密码
useradd elsearch -g elsearch -p elsearch

# 下载
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.4.2-linux-x86_64.tar.gz

# 解压
tar zxvf elasticsearch-7.4.2-linux-x86_64.tar.gz && cd elasticsearch-7.4.2/

# 切换用户组:所有者，跟上面创建的用户相对应
chown -R elsearch:elsearch .

1.注意修改network.host为各节点IP地址
2.注意修改discovery.zen.ping.unicast.hosts列表

cp -a config/elasticsearch.yml config/elasticsearch.yml.bak

cat <<EOF >>/etc/elasticsearch/elasticsearch.yml
## 集群名称
cluster.name: my-cs-cluster

## 节点名称（每个节点名称不能相同）
node.name: ‘mode-1‘

## 允许 JVM 锁住内存，禁止操作系统交换出去
# bootstrap.memory_lock: true

## 是否有资格成为主节点
## 通过 node.master 可以配置该节点是否有资格成为主节点，如果配置为 true，则主机有资格成为主节点
## 注意这里是有资格成为主节点，不是一定会成为主节点
node.master: true

## 是否是数据节点
## 当 node.master 和 node.data 均为 false，则该主机会作为负载均衡节点
node.data: true

## 设置访问的地址和端口
network.host: 192.168.182.132
http.port: 9200

## 集群地址设置
## 配置之后集群的主机之间可以自动发现
discovery.zen.ping.unicast.hosts: ["192.168.30.41", "192.168.30.42", "192.168.30.43"]

## 配置大多数节点（通常为主节点的节点总数/ 2 + 1）来防止“裂脑”：
discovery.zen.minimum_master_nodes: 2

## 在完全集群重启后阻止初始恢复，直到启动N个节点
gateway.recover_after_nodes: 2
EOF
vim /etc/elasticsearch/elasticsearch.yml

[root@file elasticsearch-7.1.1]# ./bin/elasticsearch
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c5330000, 986513408, 0) failed; error=‘Cannot allocate memory‘ (errno
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 986513408 bytes for committing reserved memory.
# An error report file with more information is saved as:
# logs/hs_err_pid27766.log

# 修改jvm.options文件配置即可，从1g改成了100m

# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space

-Xms100m
-Xmx100m