今天,講解下elasticsearch叢集的配置與在centos中如何關閉防火牆.....

首先,講解下如何在centos中關閉防火牆?

      為啥要講一下這塊內容呢?在實際的開發與運維中,經常會遇到應用啟動後,訪問應用.....報錯404......很多情況下,是與防火牆沒有開應用的埠有關.......

  檢視防火牆的狀態:

firewall-cmd --state #檢視預設防火牆狀態（關閉後顯示notrunning，開啟後顯示running）

關閉firewall：systemctl stop firewalld.service #停止firewallsystemctl disable firewalld.service

#禁止firewall開機啟動

開啟防火牆埠:

firewall-cmd --zone=public --add-port=9200/tcp --permanent      #####9200根據實際情況,修改成應用埠,或者要開啟的埠
firewall-cmd --reload       #######重啟防火牆

=============================================完結===========================================

接下來,就是運維或者實施過程中經常會遇到叢集的部署.....,下面就根據我自己的本地環境,詳細的講解下ES叢集的部署.....

ELasticsearch 5.5要求JDK版本最低為1.8;      ######實施過程中需要注意的哦......

配置叢集之前  先把要加群叢集的節點的裡的data目錄下的Node目錄 刪除，否則叢集建立會失敗。

我這邊虛擬機器配置了兩臺centos IP分別是 192.168.1.110 和 192.168.1.111 ;

分別配置下elasticsearch.yml配置檔案

110機器：

# ---------------------------------- 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: 192.168.1.110

#

# 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: ["192.168.1.110"]

#

# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):

#

#discovery.zen.minimum_master_nodes: 3

#

# 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

http.cors.enabled: true

http.cors.allow-origin: "*"

111機器：

# ---------------------------------- Cluster -----------------------------------

#

# Use a descriptive name for your cluster:

#

cluster.name: my-application

#

# ------------------------------------ Node ------------------------------------

#

# Use a descriptive name for the node:

#

node.name: node-2

#

# 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: 192.168.1.111

#

# 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: ["192.168.1.110"]

#

# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):

#

#discovery.zen.minimum_master_nodes: 3

#

# 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

這裡兩臺機器的cluster.name必須一致 這樣才算一個叢集......

node.name節點名稱每臺取不同的名稱，用來表示不同的叢集節點

network.host配置成自己的區域網IP

http.port埠就固定9200

discovery.zen.ping.unicast.hosts主動發現節點我們都配置成110節點IP

配置完後 重啟es服務；

然後head外掛我們檢視下：

如果出現上圖的情況,那麼叢集就部署成功了.......