centos7 安装elasticsearch

一、下载es tar包，es默认安装目录 不能在root根目录下面

Elasticsearch 6.3.1 地址：https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.3.1.tar.gz

cd /home

wget -c https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.3.1.tar.gz

tar -zxvf elasticsearch-6.3.1.tar.gz

 

二、es默认不能用root用户启动。我们需要新建一个用户来启动，创建esdata目录，并赋予权限、

adduser esuser

cd /home

mkdir -p esdata/data

mkdir -p esdata/log

chown -R esuser elasticsearch-6.3.1

chown -R esuser esdata

 

三、修改配置文件

cd /home/elasticsearch-6.3.1/config

cp elasticsearch.yml elasticsearch.yml.bak

vim elasticsearch.yml

# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
#       Before you set out to tweak and tune the configuration, make sure you
#       understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
#cluster.name: my-application
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
#node.name: node-1
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
#path.data: /path/to/data
#
# Path to log files:
#
#path.logs: /path/to/logs
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 0.0.0.0
#
# Set a custom port for HTTP:
#
http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
#discovery.zen.ping.unicast.hosts: ["host1", "host2"]
#
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
#discovery.zen.minimum_master_nodes: 
#
# For more information, consult the zen discovery module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true

 

四：运行

cd /home/elasticsearch-6.3.1/bin

su esuser

./elasticsearch

 

error 1

修改配置文件 /etc/security/limits.conf

su root

vim /etc/security/limits.conf 末尾追加：

esuser soft nproc 5000

esuser hard nproc 5000

 

 

error 2

elasticsearch用户拥有的内存权限太小，至少需要262144；

1、切换到root用户执行命令：sysctl -w vm.max_map_count=262144

查看结果：sysctl -a|grep vm.max_map_count

显示：vm.max_map_count = 262144

或者

2、在   /etc/sysctl.conf 文件最后添加一行

vm.max_map_count=262144 重启后即可永久修改

 

error 3

max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536] memory locking requested for elasticsearch process but memory is not locked

修改配置文件 /etc/security/limits.conf

su root

vim /etc/security/limits.conf 末尾追加：

esuser hard nofile 65536

esuser soft nofile 65536

esuser soft memlock unlimited

esuser hard memlock unlimited

 

解决某些情况下无法读写

visudo

找到## Allow root to run any commands anywhere

root ALL=(ALL) ALL

增加 esuser ALL=(ALL) ALL

 

启动：

cd /home/elasticsearch-6.3.1/bin/

su esuser

./elasticsearch

打开浏览器

es 服务所在的服务器地址+端口9200