Linux *** 作Elasticsearch7.16.2

Linux *** 作Elasticsearch7.16.2 Linux上 *** 作Elasticsearch Elasticsearch的安装

安装环境
JDK1.8
Elasticsearch7.16.2

下载es安装包
Elasticsearch7.16.2下载地址

上传到linux并解压

tar -zxvf elasticsearch-7.16.2-linux-x86_64.tar.gz mv ../elasticsearch-7.16.2

删除源码包

rm -f elasticsearch-7.16.2-linux-x86_64.tar.gz 

启动es
es安装目录下执行

./bin/elasticsearch

启动报错
Exception in thread “main” java.nio.file.AccessDeniedException:
因为es不能使用root用户启动，因此新建用户并赋权，切换到新建用户，然后启动

adduser elastic
chown -R elastic /usr/local/opt/elasticsearch-7.16.2/
su elastic
./bin/elasticsearch

原因是因为当前环境使用的是jdk8，es7以上自带jdk，对应的是jdk11，环境变量冲突，所以出现这个警告

warning: usage of JAVA_HOME is deprecated, use ES_JAVA_HOME
Future versions of Elasticsearch will require Java 11; your Java version from [/usr/local/opt/jdk1.8/jre] does not meet this requirement. Consider switching to a distribution of Elasticsearch with a bundled JDK. If you are already using a distribution with a bundled JDK, ensure the JAVA_HOME environment variable is not set.

需要修改elasticsearch-env配置文件
修改以下代码片段：

# now set the path to java
if [ ! -z "$ES_JAVA_HOME" ]; then
  JAVA="$ES_JAVA_HOME/bin/java"
  JAVA_TYPE="ES_JAVA_HOME"
elif [ ! -z "$JAVA_HOME" ]; then
   fallback to JAVA_HOME
  echo "warning: usage of JAVA_HOME is deprecated, use ES_JAVA_HOME" >&2
  JAVA="$JAVA_HOME/bin/java"
  JAVA_TYPE="JAVA_HOME"
else
   # use the bundled JDK (default)
  if [ "$(uname -s)" = "Darwin" ]; then
    # macOS has a different structure
    JAVA="$ES_HOME/jdk.app/Contents/Home/bin/java"
 else
    JAVA="$ES_HOME/jdk/bin/java"
  fi
  JAVA_TYPE="bundled JDK"
fi

将以上代码修改为

if [ "$(uname -s)" = "Darwin" ]; then
	    # macOS has a different structure
	    JAVA="$ES_HOME/jdk.app/Contents/Home/bin/java"
	  else
	    JAVA="$ES_HOME/jdk/bin/java"
	  fi
	  JAVA_TYPE="bundled jdk"

修改esjvm大小
-Xms256m
-Xmx256m

vim config/jvm.options

启动报错

ERROR: [2] bootstrap checks failed. You must address the points described in the following [2] lines before starting Elasticsearch.
bootstrap check failure [1] of [2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

编辑 /etc/sysctl.conf
最后添加vm.max_map_count=655360

vim /etc/sysctl.conf

保存后，执行：
sysctl -p

普通用户下启动
执行命令

curl 127.0.0.1:9200

启动成功

设置外网访问

vim /config/elasticsearch.yml

添加以下内容,并且开放远程防火墙端口，如果是云服务器，需要设置安全组开放9200端口

cluster.name: elasticsearch
node.name: node-1
path.data: /usr/local/opt/elasticsearch-7.16.2/data
path.logs: /usr/local/opt/elasticsearch-7.16.2/logs
network.host: 0.0.0.0
http.port: 9200
cluster.initial_master_nodes: ["node-1"]