一、下载
下载链接：https://www.elastic.co/cn/downloads/elasticsearch
二、解压
tar xzvf elasticsearch-7.15.2-linux-x86_64.tar.gz
三、将解压目录移至 /usr/local
mv elasticsearch-7.15.2 /usr/local/
四、启动
./bin/elasticsearch
报错：
1、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/jdk1.8.0_311/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.
2、Java HotSpot™ 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
3、can not run elasticsearch as root
解决方法：
1、安装jdk11，并修改文件/usr/local/elasticsearch-7.15.2/bin/elasticsearch
增加以下内容：
# 指定jdk11
export ES_JAVA_HOME=/usr/local/jdk-11.0.13
export PATH=$ES_JAVA_HOME/bin:$PATH
# 添加jdk判断
if [ -x "$ES_JAVA_HOME/bin/java" ]; then
JAVA="/usr/local/jdk-11.0.13/bin/java"
else
JAVA=`which java`
fi
2、CMS 垃圾收集器在JDK9开始被标注为@Deprecated，JDK11支持的垃圾回收器为G1和ZGC，而ZGC在JDK11还处于实验阶段。修改config目录下的jvm.options，将：-XX:+UseConcMarkSweepGC 改为：-XX:+UseG1GC
3、es5之后必须通过创建用户启动
（1）创建用户
adduser es
（2）设置密码
passwd es
（3）授权
chown -R es:es elasticsearch-7.15.2/
（4）切换es用户启动
su es
./bin/elasticsearch -d
五、测试
启动后输入curl 127.0.0.1:9200，如果返回json数据说明启动成功
六、设置外网访问
修改./config/elasticsearch.yml文件，设置：
network.host: 0.0.0.0
报错：
1、max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
2、the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured
解决方法：
1、执行命令，临时生效：
sysctl -w vm.max_map_count=262144
编辑配置文件/etc/sysctl.conf，永久生效：
vm.max_map_count=262144
2、在discovery.seed_hosts,discovery.seed_providers, cluster.initial_master_nodes中至少设置一项，将discovery.seed_hosts设置为默认值即可：
discovery.seed_hosts: ["127.0.0.1", "[::1]"]
