安装Elasticsearch（单节点Linux环境）

1 安装包下载

1）Elasticsearch官网： ​​https://www.elastic.co/products/elasticsearch​​

2 安装Elasticsearch（单节点Linux环境）

1）解压elasticsearch-5.2.2.tar.gz到/opt/module目录下

[atguigu@hadoop102 software]$ tar -zxvf elasticsearch-5.2.2.tar.gz -C /opt/module/

2）在/opt/module/elasticsearch-5.2.2路径下创建data和logs文件夹

[atguigu@hadoop102 elasticsearch-5.2.2]$ mkdir data

[atguigu@hadoop102 elasticsearch-5.2.2]$ mkdir logs

3）修改配置文件/opt/module/elasticsearch-5.2.2/config/elasticsearch.yml

[atguigu@hadoop102 config]$ pwd

/opt/module/elasticsearch-5.2.2/config

[atguigu@hadoop102 config]$ vi elasticsearch.yml

# ---------------------------------- Cluster -----------------------------------
cluster.name: my-application
# ------------------------------------ Node ------------------------------------
node.name: node-102
# ----------------------------------- Paths ------------------------------------
path.data: /opt/module/elasticsearch-5.2.2/data
path.logs: /opt/module/elasticsearch-5.2.2/logs
# ----------------------------------- Memory -----------------------------------
bootstrap.memory_lock: false
bootstrap.system_call_filter: false
# ---------------------------------- Network -----------------------------------
network.host: 192.168.1.102 
# --------------------------------- Discovery ----------------------------------
discovery.zen.ping.unicast.hosts: ["hadoop102"]

       （1）cluster.name

如果要配置集群需要两个节点上的elasticsearch配置的cluster.name相同，都启动可以自动组成集群，这里如果不改cluster.name则默认是cluster.name=my-application，

（2）nodename随意取但是集群内的各节点不能相同

（3）修改后的每行前面不能有空格，修改后的“：”后面必须有一个空格

5）配置linux系统环境

       （1）切换到root用户，编辑limits.conf 添加类似如下内容

[root@hadoop102 elasticsearch-5.2.2]# vi /etc/security/limits.conf

添加如下内容:

* soft nofile 65536

* hard nofile 131072

* soft nproc 2048

* hard nproc 4096

       （2）切换到root用户，进入limits.d目录下修改配置文件。

[root@hadoop102 elasticsearch-5.2.2]# vi /etc/security/limits.d/90-nproc.conf

修改如下内容：

* soft nproc 1024

#修改为

* soft nproc 2048

       （3）切换到root用户修改配置sysctl.conf

[root@hadoop102 elasticsearch-5.2.2]# vi /etc/sysctl.conf 

添加下面配置：

vm.max_map_count=655360

并执行命令：

[root@hadoop102 elasticsearch-5.2.2]# sysctl -p

然后，重新启动elasticsearch，即可启动成功。

6）启动集群

[atguigu@hadoop102 elasticsearch-5.2.2]$ bin/elasticsearch

7）测试集群

[atguigu@hadoop102 elasticsearch-5.2.2]$ curl http://hadoop102:9200
{
  "name" : "node-102",
  "cluster_name" : "my-application",
  "cluster_uuid" : "v-nwhc7ITsmVHECpNQYzHw",
  "version" : {
    "number" : "5.2.2",
    "build_hash" : "57e20f3",
    "build_date" : "2017-09-23T13:16:45.703Z",
    "build_snapshot" : false,
    "lucene_version" : "6.6.1"
  },
  "tagline" : "You Know, for Search"
}