linux下安裝 Elasticsearch 7.x (手把手教學)

1.導入 Elasticsearch GPG KEY:

rpm --import ./GPG-KEY-elasticsearch

or

apt-key add ./GPG-KEY-elasticsearch

2.添加elasticsearch的yum repo文件

vim /etc/yum.repos.d/elasticsearch.repo

[elasticsearch-7.x]
name=Elasticsearch repository for 7.x packages
baseurl=https://mirror.tuna.tsinghua.edu.cn/elasticstack/7.x/yum/
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md

3.安裝elasticsearch 

yum install elasticsearch

4.配置elasticsearch 

vim /etc/elasticsearch/elasticsearch.yml

# 17行，設置集群名稱
cluster.name: my-cluster

# 23行，設置節點名稱
node.name: es-node1

# 56行，允許外網訪問
network.host: 0.0.0.0

# 74行，配置集群master節點
cluster.initial_master_nodes: ["es-node1"]

# elasticsearch預設是不支持跨域的，在末尾添加如下兩行支持跨域
http.cors.enabled: true
http.cors.allow-origin: "*"

5.elasticsearch 預設需要4g的記憶體，這裡可以在適當修改，-Xms4g， 數字即為所占用記憶體

  禁止 swap，一旦允許記憶體與磁碟的交換，會引起致命的性能問題。

可以通過在 elasticsearch.yml 中 bootstrap.memory_lock: true，以保持 JVM 鎖定記憶體，保證 ES 的性能。

vim /etc/elasticsearch/jvm.options

-Xms1g
-Xmx1g

6.elasticsearch不可以在root用戶下啟動，所以需要切換用戶

# 添加用戶，我這裡叫es
adduser es 
# 給用戶設置密碼
passwd 123456
# 切換到es用戶下
su es

7.這時切換到es用戶下，又會報各種許可權不足，加上許可權就OK了

#./elasticsearch-env:行88: /etc/sysconfig/elasticsearch: 許可權不夠
chown -R es /etc/sysconfig/elasticsearch

#bin/elasticsearch-env: 第 96 行:cd: /etc/elasticsearch: 許可權不夠
chown -R es /etc/elasticsearch

#Exception in thread "main" java.nio.file.AccessDeniedException: /var/lib/elasticsearch
#只要看到AccessDeniedException異常就給它許可權
chown -R es /var/lib/elasticsearch

#Error opening log file '/var/log/elasticsearch/gc.log': Permission denied
#將整個elasticsearch目錄許可權給它
chown -R es /var/log/elasticsearch

#另外將安裝路徑的許可權給它，這裡目前還沒報錯，不過報錯是遲早的事
chown -R es /usr/share/elasticsearch

8.啟動es

cd /usr/share/elasticsearch/bin
./elasticsearch

9.測試

瀏覽器打開：http://ip:9200

如果開啟了防火牆，需要開啟9200埠，頁面信息顯示如下則啟動成功

{
  "name" : "es-node1",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "-IqD_alTS5SZ3xAtr2_qfQ",
  "version" : {
    "number" : "7.17.9",
    "build_flavor" : "default",
    "build_type" : "rpm",
    "build_hash" : "ef48222227ee6b9e70e502f0f0daa52435ee634d",
    "build_date" : "2023-01-31T05:34:43.305517834Z",
    "build_snapshot" : false,
    "lucene_version" : "8.11.1",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}