ElasticSearch（以下简称es） 是一款基于lucene的分布式全文搜索引擎服务器，它提供实时搜索，稳定，快速可靠等优势。下面基于centos7环境下安装部署es。
查看linux环境下是否安装jdk（es启动必须java8以上环境）,如果出现如下表示未安装jdk请先安装
[root@Eden666 ~]# java -version-bash: java: command not found
若wget 下载下来解压不了出现以下错误，是因为我们下载jdk时有Accept License Agreement选项需要勾选，解决办法先下载下来再通过sftp上传解压，我这边解压放在/opt/soft文件夹下。
[root@Eden666 ~]# wget http://download.oracle.com/otn-pub/java/jdk/8u191-b12/2787e4a523244c269598db4e85c51e0c/jdk-8u191-linux-x64.tar.gz[root@Eden666 ~]# tar -zxvf jdk-8u191-linux-x64.tar.gz gzip: stdin: not in gzip formattar: Child returned status 1tar: Error is not recoverable: exiting now
配置jdk环境：在export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL这行下加入jdk环境配置，
[root@Eden666 ~]# vi /etc/profileexport JAVA_HOME=/opt/soft/jdk1.8.0_191export PATH=$JAVA_HOME/bin:$PATHexport CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar [root@Eden666 ~]# java -version-bash: java: command not found [root@Eden666 ~]# source /etc/profile //刷新配置[root@Eden666 ~]# java -versionjava version "1.8.0_191"Java(TM) SE Runtime Environment (build 1.8.0_191-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)
[root@Eden666 soft]# wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.5.0.tar.gz[root@Eden666 soft]# mv elasticsearch-6.5.0.tar.gz elasticsearch-6.5.0[root@Eden666 soft]# lselasticsearch-6.5.0 jdk1.8.0_191[root@Eden666 soft]# tar -zxvf elasticsearch-6.5.0
启动es，若出现以下不能分配内存情况，则需修改es的config，重新启动
[root@Eden666 elasticsearch-6.5.0]# ./bin/elasticsearchJava HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c5330000, 986513408, 0) failed; error='Cannot allocate memory' (errno=12)## 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_pid1307.log[root@Eden666 elasticsearch-6.5.0]# vi config/jvm.options -Xms1g //我这边JVM堆最大和初始化内存改成 512m-Xmx1g
启动之后若出现如下情况，是因为开启es服务器不能使用root用户,需要新建用户，并且赋予用户执行权限
[root@Eden666 elasticsearch-6.5.0]# ./bin/elasticsearch[2018-11-15T14:58:45,626][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [unknown] 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:140) ~[elasticsearch-6.5.0.jar:6.5.0] at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127) ~[elasticsearch-6.5.0.jar:6.5.0] at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.5.0.jar:6.5.0] at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.5.0.jar:6.5.0] at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.5.0.jar:6.5.0] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[elasticsearch-6.5.0.jar:6.5.0] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86) ~[elasticsearch-6.5.0.jar:6.5.0] Caused by: java.lang.RuntimeException: can not run elasticsearch as root at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:103) ~[elasticsearch-6.5.0.jar:6.5.0] at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:170) ~[elasticsearch-6.5.0.jar:6.5.0] at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:333) ~[elasticsearch-6.5.0.jar:6.5.0] at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136) ~[elasticsearch-6.5.0.jar:6.5.0] ... 6 more [root@Eden666 elasticsearch-6.5.0]# useradd esuser[root@Eden666 elasticsearch-6.5.0]# passwd esuserChanging password for user esuser. New password: BAD PASSWORD: The password is shorter than 8 characters Retype new password: passwd: all authentication tokens updated successfully. [root@Eden666 elasticsearch-6.5.0]# chown -R esuser:esuser /opt/soft/[root@Eden666 elasticsearch-6.5.0]# su esuser[esuser@Eden666 elasticsearch-6.5.0]$ ./bin/elasticsearch
查看启动日志看是否报错，若没有报错，curl get请求返回正常说明启动成功
[root@Eden666 ~]# curl localhost:9200{ "name" : "5MLXu98", "cluster_name" : "elasticsearch", "cluster_uuid" : "I4nrxsMLR-KNRcZZnhHpIQ", "version" : { "number" : "6.5.0", "build_flavor" : "default", "build_type" : "tar", "build_hash" : "816e6f6", "build_date" : "2018-11-09T18:58:36.352602Z", "build_snapshot" : false, "lucene_version" : "7.5.0", "minimum_wire_compatibility_version" : "5.6.0", "minimum_index_compatibility_version" : "5.0.0"
}, "tagline" : "You Know, for Search"}
作者：Eden666
链接：https://www.jianshu.com/p/b17490465458
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