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# 前提：
· 必須要有Node環境和npm軟體：nodejs，npm  

1.:下載包
curl --silent --location https://rpm.nodesource.com/setup_12.x | sudo bash -

2.:安裝包（如果本身有node包但是不是新版本建議解除安裝重灌）
yum install -y nodejs

3.:驗證安裝是否成功
node -v

4.:設定淘寶映象
npm config set registry http://registry.npm.taobao.org
 


5.：安裝npm（只需要在一個節點安裝即可，如果前端還有nginx做反向代理可以每個節點都裝）
[root@elkstack01 ~]# yum install -y npm

6.：進入下載head外掛程式碼目錄
[root@elkstack01 src]# cd /usr/local/

7.：從GitHub上克隆程式碼到本地（或者直接從找es-head的包）
[root@elkstack01 local]# git clone git://github.com/mobz/elasticsearch-head.git

8.：克隆完成後，進入elasticsearch外掛目錄
[root@elkstack01 local]# cd elasticsearch
 
-head/

9.：清除快取
[root@elkstack01 elasticsearch-head]# npm cache clean -f
#使用npm安裝n模組（不同的專案js指令碼所需的node版本可能不同，所以就需要node版本管理工具）

10.安裝elasticdump
[root@db04 ~]# npm install elasticdump -g

11.本地目錄備份

## 第一次進行的是索引的備份
## 第二次進行的是資料的備份
[root@db04 bin]# ./elasticdump --input=http://10.0.0.54:9200/student/user --output=/tmp/student_mapping.json --type=mapping
 

Wed, 12 Aug 2020 07:41:59 GMT | starting dump
Wed, 12 Aug 2020 07:41:59 GMT | got 1 objects from source elasticsearch (offset: 0)
Wed, 12 Aug 2020 07:41:59 GMT | sent 1 objects to destination file, wrote 1
Wed, 12 Aug 2020 07:41:59 GMT | got 0 objects from source elasticsearch (offset: 1)
Wed, 12 Aug 2020 07:41:59 GMT | Total Writes: 1
Wed, 12 Aug 2020 07:41:59 GMT | dump complete
[root@db04 bin]# ./elasticdump --input=http://10.0.0.54:9200/student/user --output=/tmp/student_data.json --type=data
Wed, 12 Aug 2020 07:42:21 GMT | starting dump
Wed, 12 Aug 2020 07:42:21 GMT | got 8 objects from source elasticsearch (offset: 0)
Wed, 12 Aug 2020 07:42:21 GMT | sent 8 objects to destination file, wrote 8
Wed, 12 Aug 2020 07:42:21 GMT | got 0 objects from source elasticsearch (offset: 8)
Wed, 12 Aug 2020 07:42:21 GMT | Total Writes: 8
Wed, 12 Aug 2020 07:42:21 GMT | dump complete


##備份之後用Elasticsearch Head外掛模擬資料丟失，誤刪除student索引和資料並用elasticdump恢復


[root@db04 bin]# ./elasticdump --output=http://10.0.0.54:9200/student --input=/tmp/student_mapping.json --type=mapping
Wed, 12 Aug 2020 07:46:21 GMT | starting dump
Wed, 12 Aug 2020 07:46:21 GMT | got 1 objects from source file (offset: 0)
Wed, 12 Aug 2020 07:46:21 GMT | sent 1 objects to destination elasticsearch, wrote 1
Wed, 12 Aug 2020 07:46:21 GMT | got 0 objects from source file (offset: 1)
Wed, 12 Aug 2020 07:46:21 GMT | Total Writes: 1
Wed, 12 Aug 2020 07:46:21 GMT | dump complete
[root@db04 bin]# ./elasticdump --output=http://10.0.0.54:9200/student --input=/tmp/student_data.json --type=data
Wed, 12 Aug 2020 07:46:40 GMT | starting dump
Wed, 12 Aug 2020 07:46:40 GMT | got 8 objects from source file (offset: 0)
Wed, 12 Aug 2020 07:46:40 GMT | sent 8 objects to destination elasticsearch, wrote 8
Wed, 12 Aug 2020 07:46:40 GMT | got 0 objects from source file (offset: 8)
Wed, 12 Aug 2020 07:46:40 GMT | Total Writes: 8
Wed, 12 Aug 2020 07:46:40 GMT | dump complete