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前言

Elasticsearch 是一个开源的分布式 RESTful 搜索和分析引擎。它可以在近实时条件下,存储,查询和分析海量的数据。它还支持将快照备份至HDFS/S3上面,而阿里云OSS兼容S3的API,本文将介绍如何使用ES的Repository-S3插件将快照备份至OSS。

部署与配置

首先,我们需要安装repository-s3,可以参考官方文档:
https://www.elastic.co/guide/en/elasticsearch/plugins/7.2/repository-s3.html

启动ES,我们可以从log中看到,ES已经load了这个plugin:

[2019-07-15T14:12:09,225][INFO ][o.e.p.PluginsService     ] [master] loaded module [aggs-matrix-stats]
[2019-07-15T14:12:09,225][INFO ][o.e.p.PluginsService     ] [master] loaded module [analysis-common]
[2019-07-15T14:12:09,225][INFO ][o.e.p.PluginsService     ] [master] loaded module [ingest-common]
[2019-07-15T14:12:09,226][INFO ][o.e.p.PluginsService     ] [master] loaded module [ingest-geoip]
[2019-07-15T14:12:09,226][INFO ][o.e.p.PluginsService     ] [master] loaded module [ingest-user-agent]
[2019-07-15T14:12:09,226][INFO ][o.e.p.PluginsService     ] [master] loaded module [lang-expression]
[2019-07-15T14:12:09,226][INFO ][o.e.p.PluginsService     ] [master] loaded module [lang-mustache]
[2019-07-15T14:12:09,227][INFO ][o.e.p.PluginsService     ] [master] loaded module [lang-painless]
[2019-07-15T14:12:09,227][INFO ][o.e.p.PluginsService     ] [master] loaded module [mapper-extras]
[2019-07-15T14:12:09,227][INFO ][o.e.p.PluginsService     ] [master] loaded module [parent-join]
[2019-07-15T14:12:09,227][INFO ][o.e.p.PluginsService     ] [master] loaded module [percolator]
[2019-07-15T14:12:09,227][INFO ][o.e.p.PluginsService     ] [master] loaded module [rank-eval]
[2019-07-15T14:12:09,228][INFO ][o.e.p.PluginsService     ] [master] loaded module [reindex]
[2019-07-15T14:12:09,228][INFO ][o.e.p.PluginsService     ] [master] loaded module [repository-url]
[2019-07-15T14:12:09,228][INFO ][o.e.p.PluginsService     ] [master] loaded module [transport-netty4]
[2019-07-15T14:12:09,228][INFO ][o.e.p.PluginsService     ] [master] loaded plugin [repository-s3]
[2019-07-15T14:12:12,375][INFO ][o.e.d.DiscoveryModule    ] [master] using discovery type [zen] and seed hosts providers [settings]
[2019-07-15T14:12:12,801][INFO ][o.e.n.Node               ] [master] initialized
[2019-07-15T14:12:12,802][INFO ][o.e.n.Node               ] [master] starting ...

然后,我们需要将OSS使用的Access Key和Secret Key配置到ES去,分别执行下面的命令:

bin/elasticsearch-keystore add s3.client.default.access_key
bin/elasticsearch-keystore add s3.client.default.secret_key

运行

首先,我们创建一个备份:

[root@master ~]# curl -XPUT 'http://localhost:9200/_snapshot/test' -H 'Content-Type: application/json' -d '{ "type": "s3", "settings": { "bucket": "hadoop-oss-test", "endpoint": "oss-cn-zhangjiakou-internal.aliyuncs.com"} }'
{"acknowledged":true}

NOTE: 上面的命令默认使用https协议来传输数据,如果想使用http协议,需要将"protocol": "http", "disable_chunked_encoding": true加到settings里面(这个特性将会在新版本发布后可用)。

可以使用下面的命令来确实创建是否成功:

[root@master ~]# curl -XGET localhost:9200/_snapshot/test?pretty
{
  "test" : {
    "type" : "s3",
    "settings" : {
      "bucket" : "hadoop-oss-test",
      "endpoint" : "oss-cn-zhangjiakou-internal.aliyuncs.com"
    }
  }
}

我们可以写入一些测试数据到ES,然后看下目前集群的索引信息:

[root@master ~]# curl -X GET "localhost:9200/_cat/indices?v"
health status index    uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   sales    89ouBy6RQsuT34QRbn_jeQ  10   0     271786            0       15mb           15mb
green  open   customer fQCMEvXsQOu0UgMm1SAJlA   5   0      10000            0      717kb          717kb

假设我们只备份sales索引:

[root@master ~]# curl -XPUT 'http://localhost:9200/_snapshot/test/sales' -H 'Content-Type: application/json' -d '{ "indices": "sales" }'
{"accepted":true}

然后我们可以从OSS控制台看到备份的结果:

现在我们再往sales索引里面写一些数据:

[root@master ~]# curl -X GET "localhost:9200/_cat/indices?v"
health status index    uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   sales    89ouBy6RQsuT34QRbn_jeQ  10   0     281502            0     15.6mb         15.6mb
green  open   customer fQCMEvXsQOu0UgMm1SAJlA   5   0      10000            0      717kb          717kb

我们利用刚才备份到OSS的快照来恢复sales索引,分别执行下面的命令:

[root@master ~]# curl -XPOST localhost:9200/sales/_close
{"acknowledged":true,"shards_acknowledged":true,"indices":{"sales":{"closed":true}}}
[root@master ~]# curl -XPOST 'http://localhost:9200/_snapshot/test/sales/_restore?pretty'
{
  "accepted" : true
}
[root@master ~]# curl -X GET "localhost:9200/_cat/indices?v"
health status index    uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   sales    89ouBy6RQsuT34QRbn_jeQ  10   0     271786            0       15mb           15mb
green  open   customer fQCMEvXsQOu0UgMm1SAJlA   5   0      10000            0      717kb          717kb

我们可以看到,sales索引跟之前的一致。

参考资料

https://www.elastic.co/guide/en/elasticsearch/plugins/7.2/repository-s3.html

https://www.elastic.co/cn/products/elasticsearch



本文作者:冷月_wjh

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