centos8.X 安裝elasticsearch7.x


2020年10月6日00:31:26

 

1,注意elasticsearch和java的版本關系

 https://www.elastic.co/cn/support/matrix#matrix_jvm

2,安裝jdk,這里因為是elasticsearch7.x所以必須是java11以上的版本

yum search java | grep -i --color JDK

yum install java-1.8.0-openjdk-devel.x86_64

yum install java-11-openjdk.x86_64
如果有其他版本最好刪除,避免意外的問題
vi  /etc/profile
在最后面追加
export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-11.0.8.10-0.el8_2.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

注意去
/usr/lib/jvm/ 查看具體的版本
source  /etc/profile

java -version

3,下載elasticsearch

官方下載地址: https://www.elastic.co/cn/downloads/elasticsearch

wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.9.2-linux-x86_64.tar.gz
這里最后使用其他工具下載,然后上傳上去,有點大300多M

LINUX X86_64版本

如果你想yum安裝
 vi /etc/yum.repos.d/
elasticsearch.repo

[elasticsearch]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=0
autorefresh=1
type=rpm-md
yum install --enablerepo=elasticsearch elasticsearch

4,啟動elasticsearch

tar -zxvf elasticsearch-7.9.2-linux-x86_64.tar.gz

mv elasticsearch-7.9.2 elasticsearch
mv elasticsearch /usr/local/

cd /usr/local/elasticsearch
bin目錄下面啟動
./elasticsearch

測試:http://192.168.3.15:9200/
返回的是一個json
{
  "name" : "localhost.localdomain",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "9fLpa7KBTD6nExFBGALYwA",
  "version" : {
    "number" : "7.9.2",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "d34da0ea4a966c4e49417f2da2f244e3e97b4e6e",
    "build_date" : "2020-09-23T00:45:33.626720Z",
    "build_snapshot" : false,
    "lucene_version" : "8.6.2",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}
你也可以使用es的可視化插件 elasticsearch-head

5,啟動可能遇到的問題

  5.1,can not run elasticsearch as root 不能以root運行

useradd es
passwd es
chown -R es:es /usr/local/elasticsearch
su es

  5.2 開放遠程訪問  

vi conf/elasticsearch.yml
修改 network.host 為 0.0.0.0

network.host: 0.0.0.0
1
配置cluster.initial_master_nodes為當前node,默認為注釋,放開注釋就行了

cluster.initial_master_nodes: ["node-1", "node-2"]

  5.3 max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]  

network.host: 0.0.0.0  #改為0.0.0.0對外開放,如對特定ip開放則改為指定ip
http.port: 9200      #可更改端口不為9200
啟動的話可能會報錯

[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
解決辦法:
1、切換到root用戶修改配置sysctl.conf

vi /etc/sysctl.conf 
添加下面配置:

vm.max_map_count=655360
並執行命令:

sysctl -p

  5.4  Option UseConcMarkSweepGC was deprecated in version 9.0 

將jvm.options文件里的內容修改為:

-XX:+UseConcMarkSweepGC 改為 -XX:+UseG1GC

  5.5 內存太小

cd 到es目錄修改 ./config/jvm.options:

vim ./config/jvm.options 
1
修改該內容:

-Xms1G
-Xmx1G

   5.6 安裝 ElasticHD 這個ui更好看點

下載地址: https://github.com/360EntSecGroup-Skylar/ElasticHD/releases

選擇 https://github.com/360EntSecGroup-Skylar/ElasticHD/releases/download/1.4/elasticHD_linux_amd64.zip

and64架構的

1. unzip elasticHD_linux_amd64.zip
2. 修改權限:chmod -R 777 ElasticHD
3. 運行: ./ElasticHD -p 127.0.0.1:9800 

如果你想開啟遠程訪問,啟動命令改為:
運行: ./ElasticHD -p 0.0.0.0:9800 
訪問
ip:9800

ElasticHD可以獨立運行不依賴其他組件運行,還可以連接不同的elasticsearch,非常方便

 


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