Elasticsearch5.x的安裝：在ELK升級到5.0之後，有些特性發生了變化，例如全部使用JDK8，外掛變化和環境校驗等。

一、安裝Elasticsearch

• 在官網下載tar包，下載地址
• 下載之後解壓
• 進入bin目錄下啟動

備註：如果是root使用者啟動會出現異常，因為es出去安全性考慮，禁止以root使用者啟動，解決辦法是新建一個使用者，詳情請看這篇部落格：CENTOS安裝ElasticSearch。

• 進入es的conf目錄修改配置檔案

cluster.name: es-cluster
node.name: node-1
network.host: 0.0.0.0
http.port: 9200
 

• 啟動ES，命令如下

  • ./elasticsearch
  • ./elasticsearch -d (這是後臺啟動）

• 看到如下日誌資訊：

[2017-03-25T14:30:45,189][INFO ][o.e.n.Node               ] [node-1] initializing ...
[2017-03-25T14:30:45,272][INFO ][o.e.e.NodeEnvironment    ] [node-1] using [1] data paths, mounts [[/ (/dev/disk1)]], net usable_space [278.8gb], net total_space [464.6
 
gb], spins? [unknown], types [hfs]
[2017-03-25T14:30:45,272][INFO ][o.e.e.NodeEnvironment    ] [node-1] heap size [1.9gb], compressed ordinary object pointers [true]
[2017-03-25T14:30:45,273][INFO ][o.e.n.Node               ] [node-1] node name [node-1], node ID [n1HFjO-TQlSs4Ncw0HD34A]
[2017-03-25T14:30:45,276
 
][INFO ][o.e.n.Node               ] [node-1] version[5.2.2], pid[3763], build[f9d9b74/2017-02-24T17:26:45.835Z], OS[Mac OS X/10.12.3/x86_64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1.8.0_111/25.111-b14]
[2017-03-25T14:30:45,971][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [aggs-matrix-stats]
[2017-03-25T14:30:45,971][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [ingest-common]
[2017-03-25T14:30:45,971][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [lang-expression]
[2017-03-25T14:30:45,971][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [lang-groovy]
[2017-03-25T14:30:45,971][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [lang-mustache]
[2017-03-25T14:30:45,971][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [lang-painless]
[2017-03-25T14:30:45,971][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [percolator]
[2017-03-25T14:30:45,971][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [reindex]
[2017-03-25T14:30:45,972][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [transport-netty3]
[2017-03-25T14:30:45,972][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [transport-netty4]
[2017-03-25T14:30:45,972][INFO ][o.e.p.PluginsService     ] [node-1] no plugins loaded
[2017-03-25T14:30:47,936][INFO ][o.e.n.Node               ] [node-1] initialized
[2017-03-25T14:30:47,936][INFO ][o.e.n.Node               ] [node-1] starting ...
[2017-03-25T14:30:48,119][INFO ][o.e.t.TransportService   ] [node-1] publish_address {192.168.31.110:9300}, bound_addresses {[::]:9300}
[2017-03-25T14:30:48,123][INFO ][o.e.b.BootstrapChecks    ] [node-1] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
[2017-03-25T14:30:51,226][INFO ][o.e.c.s.ClusterService   ] [node-1] new_master {node-1}{n1HFjO-TQlSs4Ncw0HD34A}{gn6UwArmTG-DEwYmzh1U9g}{192.168.31.110}{192.168.31.110:9300}, reason: zen-disco-elected-as-master ([0] nodes joined)
[2017-03-25T14:30:51,240][INFO ][o.e.h.HttpServer         ] [node-1] publish_address {192.168.31.110:9200}, bound_addresses {[::]:9200}
[2017-03-25T14:30:51,240][INFO ][o.e.n.Node               ] [node-1] started
[2017-03-25T14:30:51,246][INFO ][o.e.g.GatewayService     ] [node-1] recovered [0] indices into cluster_state

• 通過IP訪問，例如我的IP是192.168.31.110，那麼訪問地址就是192.168.31.110:9200，可以看到如下資訊

{
name: "n1HFjO-",
cluster_name: "elasticsearch",
cluster_uuid: "njH6T6eMS-mDf3tloN5THg",
version: {
number: "5.2.2",
build_hash: "f9d9b74",
build_date: "2017-02-24T17:26:45.835Z",
build_snapshot: false,
lucene_version: "6.4.1"
},
tagline: "You Know, for Search"
}

二、安裝Head外掛

Head外掛是我們常用的外掛，但是在ELK5.0以後按照之前的外掛安裝方式不能使用了，看了head官網之後，要單獨啟動一個服務才可以。

git clone git://github.com/mobz/elasticsearch-head.git
cd elasticsearch-head
npm install
grunt server

這裡依賴Node環境，我們需要做一下工作：

1、Head外掛安裝

• 下載並安裝對應的Node安裝包
• 安裝Git環境
• 下載Head專案
• cd elasticsearch-head
• 修改伺服器監聽地址，地址目錄：head/Gruntfile.js

connect: {
    server: {
        options: {
            port: 9100,
            hostname: '*',
            base: '.',
            keepalive: true
        }
    }
}

• 修改連線地址，目錄：head/_site/app.js

• npm install

• grunt是一個很方便的構建工具，可以進行打包壓縮、測試、執行等等的工作，5.0裡的head外掛就是通過grunt啟動的。因此需要安裝一下grunt：npm install grunt-cli
• grunt server：保證es服務已經啟動

• 開啟瀏覽器輸入：IP:9100

• 正常的話可以看到已經連線了ES，但是ES社群中很多人反映都配置好了，但是看不到連線資訊，這時候需要在在 es 的 elasticsearch.ym 裡新增如下配置：

http.cors.enabled: true
http.cors.allow-origin: "*"