Elasticsearch（ES）是一个基于 Lucene的开源搜索引擎，它不但稳定、可靠、快速，而且也具有良好的水平扩展能力，是专门为分布式环境设计的。如何下是两个节点集群安装流程：
1、前提条件，es运行需要非root用户负责会出现如下错误，以及需要安装jdk
./elasticsearch
Exception in thread "main" java.lang.RuntimeException: don't run elasticsearch as root.
2、新建linux用户并修改用户权限：
在/home/下查看已有用户，新建用户：
useradd root2
passwd root2
cdt_root123
vi etc/sudoers #在root下加入如下增加用户权限
root2 ALL=(ALL) ALL
3、解压（Es是解压即可运行）
tar -zxvf elasticsearch-2.4.0.tar.gz
4、进入 /dwbi/elasticsearch-2.4.0/config/elasticsearch.yml
找到 cluster.name: myClusterEs修改集群名，修改结点名： node.name: myNodeEs
修改ip和端口：network.host: 192.168.1.1，http.port: 9200
进入/dwbi/elasticsearch-2.4.0/bin/elasticsearch.in.sh
找到ES_MIN_MEM和ES_MAX_MEM，修改es最大和最小占用内存值，512和2g
5、运行./elasticsearch 出现错误
log4j:ERROR setFile(null,true) call failed.
java.io.FileNotFoundException: /dwbi/elasticsearch-2.4.0/logs/elasticsearch.log (权限不够)
........
解决方法:将 /dwbi/elasticsearch-2.4.0所属用户改为root2并赋予其执行权限：
chmod -R 777 elasticsearch-2.4.0
sudo chown root2 elasticsearch-2.4.0
因回忆写，好像加了下面的，把根据提示的错误修改了对应文件夹的权限和所属用户
sudo chown root2 bin
chmod -R 777 logs
sudo chown -R root2 elasticsearch-2.4.0
5、启动./elasticsearch
进入http://192.168.1.1:9200/
{
"name" : "myNodeEs",
"cluster_name" : "myClusterEs",
"version" : {
"number" : "2.4.0",
"build_hash" : "ce9f0c7394dee074091dd1bc4e9469251181fc55",
"build_timestamp" : "2016-08-29T09:14:17Z",
"build_snapshot" : false,
"lucene_version" : "5.5.2"
},
"tagline" : "You Know, for Search"
}
ok，成功
6、运用插件运行关闭es，下载插件elasticsearch-servicewrapper-master.zip
解压：
sudo unzip elasticsearch-servicewrapper-master.zip
mv /dwbi/elasticsearch-servicewrapper-master/service /dwbi/elasticsearch-2.4.0/bin/service
7、启动es，
cd /dwbi/elasticsearch-2.4.0/bin/service
./elasticsearch start （后台运行，console 前台运行，stop停止）
8、安装elasticsearch的集群管理工具elasticsearch-head
建立文件夹/dwbi/elasticsearch-2.4.0/plugins/head/_site文件
解压
sudo unzip elasticsearch-head-master.zip
cp -r elasticsearch-head-master/* /dwbi/elasticsearch-2.4.0/plugins/head/_site/
9、打开http://localhost:9200/_plugin/head/即可web访问
10、集群配置
按照相同方法安装，然后在elasticsearch.yml末尾加入如下信息即可
node.master: true
node.data: true
index.number_of_shards: 5
index.number_of_replicas: 3
network.bind_host: 0.0.0.0
network.publish_host: 192.168.1.1
transport.tcp.port: 9300
transport.tcp.compress: true
http.max_content_length: 100mb
http.enabled: true
discovery.zen.ping.unicast.hosts: ["192.168.1.1:9300","192.168.1.2:9300"]
./elasticsearch -d
over！
错误汇总：
[root2@datanode1 bin]$ ./elasticsearch
[2016-09-21 16:12:23,099][WARN ][bootstrap ] unable to install syscall filter: seccomp unavailable: requires kernel 3.5+ with CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER compiled in
[2016-09-21 16:12:23,398][INFO ][node ] [myNodeEs] version[2.4.0], pid[118119], build[ce9f0c7/2016-08-29T09:14:17Z]
[2016-09-21 16:12:23,398][INFO ][node ] [myNodeEs] initializing ...
Exception in thread "main" java.lang.IllegalStateException: Could not load plugin descriptor for existing plugin [head]. Was the plugin built before 2.0?
Likely root cause: java.nio.file.NoSuchFileException: /dwbi/elasticsearch-2.4.0/plugins/head/plugin-descriptor.properties
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:214)
at java.nio.file.Files.newByteChannel(Files.java:317)
at java.nio.file.Files.newByteChannel(Files.java:363)
at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:380)
at java.nio.file.Files.newInputStream(Files.java:108)
at org.elasticsearch.plugins.PluginInfo.readFromProperties(PluginInfo.java:87)
at org.elasticsearch.plugins.PluginsService.getPluginBundles(PluginsService.java:378)
at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:128)
at org.elasticsearch.node.Node.<init>(Node.java:158)
at org.elasticsearch.node.Node.<init>(Node.java:140)
at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:143)
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:194)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:286)
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:35)
Refer to the log for complete error details.
解决方法：
cp /dwbi/elasticsearch-2.4.0/plugins/head/_site /dwbi/elasticsearch-2.4.0/plugins/head/
华青莲日常点滴，方便自己，成长他人！！！
相关参考：
http://blog.csdn.net/july_2/article/details/24481935
http://blog.csdn.net/peibolinux/article/details/37560657
https://github.com/mobz/elasticsearch-head
http://www.mamicode.com/info-detail-873117.html
