ElasticSearch(二)CentOs6.4下安装ElasticSearch

一、准备工作

Elastic 需要 Java 8 环境。如果你的机器还没安装 Java，先需要安装java环境，同时还注意要保证环境变量JAVA_HOME正确设置。

链接：https://pan.baidu.com/s/1X8IMOw9AWsZjQqu8KYX2ww 密码：s1ov//百度云分享链接/如果失效了可以找我要

习惯性下载到/usr/local/src目录下，解压并创建软连接，方便配置环境变量

#tar zxf jdk-8u91-linux-x64.tar.gz -C /usr/local/  //解压
#ln –s /usr/local/jdk1..0_91 /usr/local/jdk       //创建软连接

# vim /etc/profile 　　　　　　　　　　　　　　　　　　 //把下面三行代码放在底部
export JAVA_HOME=/usr/local/jdk
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
# source /etc/profile 　　　　　　　　　　　　　　     //编辑完成之后执行命令生效

# java -version   //执行命令，出现下面三行代码表示成功
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) -Bit Server VM (build 25.91-b14, mixed mode)

二、配置安装ElasticSearch（这里是源码包方式安装版本elasticsearch-2.4.1，rpm包形式安装）

下载安装

链接：https://pan.baidu.com/s/1nQw03ONklUyYWRQ2hKaHUw 密码：pmj5  //百度云地址

wget https://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/rpm/elasticsearch/2.4.1/elasticsearch-2.4.1.rpm  //直接命令下载

# yum -y install elasticsearch-2.4.1.rpm  

修改配置文件

# vim /etc/elasticsearch/elasticsearch.yml

#集群名称
cluster.name: my-application
#节点名称
node.name: node-
#数据存储路径
path.data: /var/lib/elasticsearch
#日志存储路径
path.logs: /var/log/elasticsearch
#将来访问elastic的话，都是通过API访问，在这我们要提供一个http主机地址，这里就是本机IP
network.host: 192.168.9.155
#默认端口
http.port: 

启动ElasticSearch

#servicc elasticsearch start //启动测试

这里遇到了几个错误~

错误一：不能root用户启动

[--11T09::,][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-] 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:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.cli.Command.main(Command.java:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:) ~[elasticsearch-5.1..jar:5.1.]
Caused by: java.lang.RuntimeException: can not run elasticsearch as root
    at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:) ~[elasticsearch-5.1..jar:5.1.]
    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:) ~[elasticsearch-5.1..jar:5.1.]
    ...  more

解决（创建新用户）

#groupadd elasticsearch
#useradd elasticsearch -g elasticsearch -p elasticsearch
#cd /opt
#chown -R elasticsearch:elasticsearch /usr/local/elasticsearch

错误二：启动检查没有通过

[--11T09::,][INFO ][o.e.p.PluginsService     ] [node-] loaded module [transport-netty4]
[--11T09::,][INFO ][o.e.p.PluginsService     ] [node-] no plugins loaded
[--11T09::,][INFO ][o.e.n.Node               ] [node-] initialized
[--11T09::,][INFO ][o.e.n.Node               ] [node-] starting ...
[--11T09::,][INFO ][o.e.t.TransportService   ] [node-] publish_address {192.168.9.149:}, bound_addresses {192.168.9.149:}
[--11T09::,][INFO ][o.e.b.BootstrapCheck     ] [node-] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
ERROR: bootstrap checks failed
max file descriptors [] for elasticsearch process is too low, increase to at least []
max virtual memory areas vm.max_map_count [] is too low, increase to at least []
[--11T09::,][INFO ][o.e.n.Node               ] [node-] stopping ...
[--11T09::,][INFO ][o.e.n.Node               ] [node-] stopped
[--11T09::,][INFO ][o.e.n.Node               ] [node-] closing ...
[--11T09::,][INFO ][o.e.n.Node               ] [node-] closed

①解决max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]。记住root用户修改完文件，切换到elasticsearch用户启动服务时，还会报错，记得一定再切换root，再切回elasticsearch用户启动方可成功

#vim  /etc/security/limits.conf //在底部添加两行代码，让人需要切换到root用户哦
* soft nofile
* hard nofile 

②解决max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

# vim  /etc/security/limits.conf  　　　　 //添加下面一行
vm.max_map_count=  　　　　　　　　   //添加此行
#sysctl -p                                //添加完成执行此命令

切换到elasticsearch用户重新启动服务，返回下面提示即表示成功~

[--11T09::,][INFO ][o.e.p.PluginsService     ] [node-] loaded module [transport-netty3]
[--11T09::,][INFO ][o.e.p.PluginsService     ] [node-] loaded module [transport-netty4]
[--11T09::,][INFO ][o.e.p.PluginsService     ] [node-] no plugins loaded
[--11T09::,][INFO ][o.e.n.Node               ] [node-] initialized
[--11T09::,][INFO ][o.e.n.Node               ] [node-] starting ...
[--11T09::,][INFO ][o.e.t.TransportService   ] [node-] publish_address {192.168.9.149:}, bound_addresses {192.168.9.149:}
[--11T09::,][INFO ][o.e.b.BootstrapCheck     ] [node-] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
[--11T09::,][INFO ][o.e.c.s.ClusterService   ] [node-] new_master {node-}{Tjz6HoyoR1KhuIuhE7A8FA}{CTQ4R5bjQ02yNoPlUwasQw}{192.168.9.149}{192.168.9.149:}, reason: zen-disco-elected-as-master ([] nodes joined)
[--11T09::,][INFO ][o.e.h.HttpServer         ] [node-] publish_address {192.168.9.149:}, bound_addresses {192.168.9.149:}
[--11T09::,][INFO ][o.e.n.Node               ] [node-] started
[--11T09::,][INFO ][o.e.g.GatewayService     ] [node-] recovered [] indices into cluster_state

错误三：java_path路径

which: no java in (/sbin:/usr/sbin:/bin:/usr/bin)
Could not find any executable java binary. Please install java in your PATH or set JAVA_HOME

解决办法：

# vim /etc/sysconfig/elasticsearch  //添加下面一行到末尾
JAVA_HOME=/usr/local/jdk

OK~~启动成功

# service elasticsearch start
Starting elasticsearch:                                    [  OK  ]

试着curl访问

关掉防火墙浏览器访问

OK~