ELK:Centos 安装elasticsearch

本文详细介绍Elasticsearch的安装部署流程,包括环境准备、用户创建、配置文件修改及异常处理等关键步骤。

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说明:elasticsearch 运行基于jdk,所以提前请配置好Java环境变量。

步骤一: 拷贝、解压(此处略过)。

步骤二:创建用户:els 不能用root用户启动,所以必须创建一个用户

adduser elk
chown elk:elk -R elasticsearch-6.8.1

步骤三:修改配置文件

# ======================== 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: /usr/local/package/elasticsearch-6.8.1/data
#
# Path to log files:
#
path.logs: /usr/local/package/elasticsearch-6.8.1/logs
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: false
#
# 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: ["127.0.0.1"]
#
# 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: 1
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true

步骤四: 启动elasticsearch(切换到刚才新建的elk用户)

./bin/elasticsearch  -d

  说明: -d 在后台进程运行。

步骤五:验证是否启动成功:

 输入:http://192.169.239.132:9200, 返回以下内容,则正常运行:

{
  "name" : "node-1",
  "cluster_name" : "my-application",
  "cluster_uuid" : "Mh72sbXURlC5H4Zp-XgIAA",
  "version" : {
    "number" : "6.8.1",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "1fad4e1",
    "build_date" : "2019-06-18T13:16:52.517138Z",
    "build_snapshot" : false,
    "lucene_version" : "7.7.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

异常问题处理:

1. 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

 解决方法:

[root@bogon bin]#  vim /etc/security/limits.conf(在文件最后添加)
* hard nofile 65536
* soft nofile 65536
* soft memlock unlimited
* hard memlock unlimited

2. max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

解决办法:

修改vim /etc/sysctl.conf 文件,
添加 “vm.max_map_count=262144”设置
并执行:sysctl -p

3. max number of threads [3895] for user [esuser] is too low, increase to at least [4096]

解决办法:

1、vim /etc/security/limits.d/20-nproc.conf文件尾添加

* soft nproc 204800 
* hard nproc 204800 
  

2、vim /etc/security/limits.d/def.conf文件尾添加

* soft nofile 204800 
* hard nofile 204800 

 

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