49760浏览前言
随着数字化时代的到来，数据量正在经历爆炸式增长，选择使用Elasticsearch的企业变得越来越多。京东云搜索Elasticsearch（JCS for Elasticsearch，简称ES）是基于开源Elasticsearch的分布式全文搜索服务，产品能够提供高可用、易扩展以及近实时的搜索能力，致力于海量数据存储搜索和实时日志分析，旨在为用户提供更稳定、实时、可靠的云搜索服务。上云过程中不可避免的就会遇到数据迁移的问题。
迁移的方式包括不停机迁移上云和停机迁移上云两种，今天我们谈下停机迁移上云中比较常用的快照迁移方式和reindex迁移。
一．快照迁移
迁移准备
- 源es集群
用户自建ES，需要提前在ES上安装S3插件并修改ES安全配置：
1.
注：不安装，创建快照仓库会有报错：repository
type [s3] does not exist
2.
注：不修改JVM参数，创建快照仓库会出现报错：Setting [access_key] is insecure, but property
[allow_insecure_settings] is not set
//设置快照仓库
PUT _snapshot/my_backup
{
"type": "s3",
"settings": {
"bucket": "test666",
"region": "cn-north-1",
"access_key":"XXX",
"secret_key":"XXX",
"base_path":"instance01",
"protocol":"http",
"endpoint":" s3.cn-north-1.jdcloud-oss.com
", #如果自建es部署在和oss相同可用区的云主机上，此时可以使用云存储的内网地址
"compress":"true"
}
}
//查看仓库
GET
_snapshot/my_backup/*
//创建并上传快照
POST
/_snapshot/my_backup/snapshot_1
//指定索引创建快照并上传到快照仓库
POST
/_snapshot/my_backup/snapshot_3
{
"indices": "blog_index1",
"ignore_unavailable":
"true",
"include_global_state":
"false",
"partial": "false"
}
- 目的es集群
//设置快照仓库
PUT _snapshot/my_backup
{
"type": "s3",
"settings": {
"bucket": "test666",
"region": "cn-north-1",
"access_key":"XXX",
"secret_key":"XXX",
"base_path":"instance01",
"protocol":"http",
"endpoint":"s3-internal.cn-north-1.jdcloud-oss.com",
"compress":"true"
}
}
//查看仓库
GET
_snapshot/my_backup/*
//恢复快照
POST
/_snapshot/my_backup/snapshot_1/_restore
备注
云es和云oss在不同vpc下或使用的是其他厂商的oss，由于云es没有公网地址，此时可以配置nat网关，云es通过nat网关访问公网oss地址。
版本兼容性
https://www.elastic.co/guide/en/elasticsearch/reference/current/snapshot-restore.html
A
snapshot of an index created in 6.x can be restored to 7.x.
A snapshot
of an index created in 5.x can be restored to 6.x.
A
snapshot of an index created in 2.x can be restored to 5.x.
A
snapshot of an index created in 1.x can be restored to 2.x.
二．reindex迁移
迁移准备
- 源es集群
1.创建索引
PUT blog_index_77
{
"mappings":
{
"user":{
"properties":{
"name":{"type":"text"},
"title":{"type":"text"},
"age":{"type":"integer"}
}
}
}
}
2.写入数据
POST blog_index_77/user
{
"title":
"manager",
"name": "Tom
Jerry",
"age": 34
}
- 目的es集群
1.由于云es没有公网地址，配置nat网关，使目的es通过nat可以访问到自建集群
2.创建索引
PUT blog_index_66
{
"mappings":
{
"user":{
"properties":{
"name":{"type":"text"},
"title":{"type":"text"},
"age":{"type":"integer"}
}
}
}
}
3.配置 reindex.remote.whitelist 参数，指明能够reindex 的远程集群的白名单
在elasticsearch.yml文件中添加：reindex.remote.whitelist: "116.196.106.13:9200" 并重启
4.reindex迁移数据
POST _reindex
{
"source": {
"remote": {
"host": "http://116.196.106.13:9200",
"socket_timeout":
"1m",
"connect_timeout":
"10s"
},
"index":
"blog_index_77"
},
"dest": {
"index":
"blog_index_66"
}
}
5.迁移部分数据：查询条件为 title 字段为manager，将结果写入当前集群的 blog_index_66索引。
POST _reindex
{
"source": {
"remote": {
"host": "http://116.196.106.13:9200",
"socket_timeout":
"1m",
"connect_timeout":
"10s"
},
"index":
"blog_index77",
"query":{
"match":{
"title":"manager"
}
}
},
"dest": {
"index":
"blog_index_66"
}
}
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