安装ElasticSearch

官网：https://www.elastic.co/guide/en/elasticsearch/reference/5.6/rpm.html

Download and install the public signing key:

rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

Installing from the RPM repository

add the repository file /etc/yum.repos.d/elasticsearch.repo with the following contents

[elasticsearch-5.x]
name=Elasticsearch repository for 5.x packages
baseurl=https://artifacts.elastic.co/packages/5.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md

install Elasticsearch :

sudo yum install elasticsearch 

Running Elasticsearch with systemd

To configure Elasticsearch to start automatically when the system boots up, run the following commands:

sudo /bin/systemctl daemon-reload
sudo /bin/systemctl enable elasticsearch.service

Elasticsearch can be started and stopped as follows:

sudo systemctl start elasticsearch.service
sudo systemctl stop elasticsearch.service

These commands provide no feedback as to whether Elasticsearch was started successfully or not. Instead, this information will be written in the log files located in /var/log/elasticsearch/.

By default the Elasticsearch service doesn’t log information in the systemd journal. To enable journalctl logging, the --quiet option must be removed from the ExecStart command line in the elasticsearch.service file.

When systemd logging is enabled, the logging information are available using the journalctlcommands:

To tail the journal:

sudo journalctl -f

To list journal entries for the elasticsearch service:

sudo journalctl --unit elasticsearch

To list journal entries for the elasticsearch service starting from a given time:

sudo journalctl --unit elasticsearch --since  "2016-10-30 18:17:16"

Checking that Elasticsearch is running

You can test that your Elasticsearch node is running by sending an HTTP request to port 9200 on localhost:

curl -X get localhost:9200

which should give you a response something like this:

{
  "name" : "Cp8oag6",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "AT69_T_DTp-1qgIJlatQqA",
  "version" : {
    "number" : "5.6.8",
    "build_hash" : "f27399d",
    "build_date" : "2016-03-30T09:51:41.449Z",
    "build_snapshot" : false,
    "lucene_version" : "6.6.1"
  },
  "tagline" : "You Know, for Search"
}

配置文件：

[root@localhost elasticsearch]# pwd
/etc/elasticsearch
[root@localhost elasticsearch]# ll
total 16
-rw-rw----. 1 root elasticsearch 2875 Apr  7 09:58 elasticsearch.yml
-rw-rw----. 1 root elasticsearch 3068 Apr  7 10:10 jvm.options
-rw-rw----. 1 root elasticsearch 4456 Feb 17 00:48 log4j2.properties
drwxr-x---. 2 root elasticsearch    6 Feb 17 00:48 scripts

　　

NOTE1：通过ip:9200无法访问

　　　    解决方案：修改elasticsearch.yml文件的network.host属性

NOTE2：elasticsearch因内存不足启动失败

　　　　解决方案：修改jvm.options文件的-Xms和-Xmx值（Xms和Xmx值应该一样）