ES 本地备份和恢复

简化的步骤是：

• 定义存储在哪里（注册仓库）
• 把数据存储进去（创建快照）
• 从备份中恢复数据（从快照中还原）

前期准备

ES 安装

从官网下载linux源码包 https://www.elastic.co/downloads/elasticsearch

curl -L -O https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.9.2-linux-x86_64.tar.gz
tar -xzvf elasticsearch-7.9.2-linux-x86_64.tar.gz
cd elasticsearch-7.9.2

修改配置文件 config/elasticsearch.yml 添加

path.repo: ["/hadoop/backup"]

这个目录要提前创建，并且ES 用户有写权限。

然后启动服务

./bin/elasticsearch

提供要备份的索引

Create index

curl -XPUT 'localhost:9200/customer?pretty'

Create documents

for i in {1..100};
do
    curl -s -X POST "localhost:9200/customer/_doc/" -H 'Content-Type: application/json' -d"
    {
      \"id\": ${i},
      \"num\": ${i},
      \"name\": \"John Doe\"
    }" 
done

Check

$ curl 'localhost:9200/_cat/indices?v'
health status index    uuid                   pri rep docs.count docs.deleted store.size pri.store.size
yellow open   customer MTqBTUhGTyqajUGDUCJj_g   1   1        100            0     17.7kb         17.7kb

注册仓库

curl -X PUT "localhost:9200/_snapshot/my_backup?pretty" -H 'Content-Type: application/json' -d'
{
  "type": "fs",
  "settings": {
    "location": "/hadoop/backup"
  }
}
'

创建快照

curl -X PUT "localhost:9200/_snapshot/my_backup/snapshot_1?wait_for_completion=true&pretty"

其它相关命令

curl -X GET "localhost:9200/_snapshot/my_backup/*?pretty"
curl -X GET "localhost:9200/_snapshot/my_backup/snapshot_1/_status?pretty"
curl -X DELETE "localhost:9200/_snapshot/my_backup/snapshot_1?pretty"

恢复

delete the index

curl -XDELETE 'localhost:9200/customer'

restore

curl -X POST "localhost:9200/_snapshot/my_backup/snapshot_1/_restore?pretty"

check again

$ curl 'localhost:9200/_cat/indices?v'
health status index    uuid                   pri rep docs.count docs.deleted store.size pri.store.size
yellow open   customer so8ALpCSTe2_loc4hOdtpg   1   1        100            0       18kb           18kb