自建ES通过OSS快照迁移至阿里云ES
在同一个VPC内使用3台ECS部署自建ES集群，可以通过给自建Elasticsearch打快照存储到OSS，在利用OSS中的快照进行数据库恢复，将自建Elasticsearch迁移至阿里云Elasticsearch。
安装OSS快照仓库插件，下载插件并解压到ES集群各节点Elasticsearch根目录下的plugins目录
# wget https://github.com/zhichen/elasticsearch-repository-oss/releases/download/v5.5.3/elasticsearch-repository-oss-5.5.3.zip
# unzip elasticsearch-repository-oss-5.5.3.zip -d /srv/elasticsearch-5.4.3/plugins/修改配置文件中的版本号为当前ES集群的版本，完成后需要重启ES各节点。
# cat /srv/elasticsearch-5.4.3/plugins/elasticsearch/plugin-descriptor.properties |grep version |grep -v "^#"
version=5.4.3
java.version=1.8
elasticsearch.version=5.4.3新购与自建ES集群在同一个region的标准存储类型OSS，（阿里云暂不支持归档存储类型OSS）。
在自建ES上创建仓库，OSS所属阿里云主账号AK信息，若使用子账号需要有管理OSS的权限。
PUT _snapshot/robin_backup
{
"type": "oss",
"settings": {
"endpoint": "http://oss-cn-hangzhou-internal.aliyuncs.com",
"access_key_id": "Lxxxxxxxxxa",
"secret_access_key": "Nxxxxxxxxxxxxxxxxxxpt",
"bucket": "shasengtest",
"compress": true
}
}可以根据实际情况在setting中增加设置
"chunk_size": "500mb", #限制snapshot过程中分块的大小，超过这个大小，数据将会被分块上传到OSS中
"base_path": "snapshot/" #设置仓库的起始位置，默认为根目录获取全部仓库信息，设置了robin_backup及robin_backup2两个仓库
# curl -XGET es1:9001/_snapshot/?pretty
{
"robin_backup" : {
"type" : "oss",
"settings" : {
"bucket" : "shasengtest",
"compress" : "true",
"endpoint" : "http://oss-cn-hangzhou-internal.aliyuncs.com"
}
},
"robin_backup2" : {
"type" : "oss",
"settings" : {
"bucket" : "robin7",
"compress" : "true",
"endpoint" : "http://oss-cn-hangzhou-internal.aliyuncs.com"
}
}
}删除仓库
DELETE _snapshot/robin_backup1获取指定仓库信息
# curl -XGET es1:9001/_snapshot/robin_backup?pretty
{
"robin_backup" : {
"type" : "oss",
"settings" : {
"bucket" : "shasengtest",
"compress" : "true",
"endpoint" : "http://oss-cn-hangzhou-internal.aliyuncs.com"
}
}
}备份当前自建ES集群所有打开的索引到指定仓库，创建快照并命名为test
PUT _snapshot/robin_backup/test获得test快照信息，可以看到备份了当前集群全部的索引test，test1，.kibana
# curl -XGET es1:9001/_snapshot/robin_backup/test?pretty
{
"snapshots" : [
{
"snapshot" : "test",
"uuid" : "oXtFY174RyeKRgYFi_dXKA",
"version_id" : 5040399,
"version" : "5.4.3",
"indices" : [
"test",
"test1",
".kibana"
],
"state" : "SUCCESS",
"start_time" : "2018-04-10T12:44:26.027Z",
"start_time_in_millis" : 1523364266027,
"end_time" : "2018-04-10T12:44:27.204Z",
"end_time_in_millis" : 1523364267204,
"duration_in_millis" : 1177,
"failures" : [ ],
"shards" : {
"total" : 11,
"failed" : 0,
"successful" : 11
}
}
]
}备份指定test2索引到robin_backup下并命名快照为test2
PUT _snapshot/robin_backup/test2
{
"indices": "test2"
}获得单个快照test2信息，指包含了test2这一个索引
# curl -XGET es1:9001/_snapshot/robin_backup/test2?pretty
{
"snapshots" : [
{
"snapshot" : "test2",
"uuid" : "L6MknW92RGe55fZS1HIVUw",
"version_id" : 5040399,
"version" : "5.4.3",
"indices" : [
"test2"
],
"state" : "SUCCESS",
"start_time" : "2018-04-10T12:47:19.430Z",
"start_time_in_millis" : 1523364439430,
"end_time" : "2018-04-10T12:47:20.099Z",
"end_time_in_millis" : 1523364440099,
"duration_in_millis" : 669,
"failures" : [ ],
"shards" : {
"total" : 5,
"failed" : 0,
"successful" : 5
}
}
]
}删除索引test及test1，并关闭索引.kibana
# curl -XDELETE es2:9001/test
{"acknowledged":true}
# curl -XDELETE es2:9001/test1
{"acknowledged":true}
# curl -XPOST es2:9001/.kibana/_close
{"acknowledged":true}
# curl -XGET es2:9001/_cat/indices
green open test3 YcU56zKqTNaTNH8Vcr6jpw 5 1 168 0 395.8kb 217.5kb
green open test2 M-kOMZVkRcWwOwQlFRKRWw 5 1 139 0 343.1kb 171.5kb
close .kibana Lcv2WmUPTxqPjoNJV2C7sQ elasticsearch的索引快照与ECS快照不同，并不是打快照那一时刻的整个集群状态。这里可以把索引理解成ECS下挂载的数据盘之一，只需要对重要的数据盘打快照，并不是所有的磁盘都需要打快照，恢复时可以选择只恢复某一块盘的数据，而不是对所有的磁盘进行回滚。
从test快照恢复索引
# curl -XPOST es1:9001/_snapshot/robin_backup/test/_restore
{"accepted":true}查看恢复效果
# curl -XGET es2:9001/_cat/indices
green open test fEukT7eWQ-OjD3uzxKmXcg 5 1 211 0 507.6kb 253.8kb
green open test1 mw6MvvuZSlys0YLjo-UU-Q 5 1 277 0 611.3kb 305.6kb
green open .kibana Lcv2WmUPTxqPjoNJV2C7sQ 1 1 2 0 15.4kb 7.7kb
green open test3 YcU56zKqTNaTNH8Vcr6jpw 5 1 168 0 395.8kb 217.5kb
green open test2 M-kOMZVkRcWwOwQlFRKRWw 5 1 139 0 343.1kb 171.5kb也可以安装cerebro插件查看已存在的索引快照，单击restore即可恢复索引。
也可以选择只恢复部分索引
# curl -XPOST es1:9001/_snapshot/robin_backup/test/_restore
{
"indices": "test1", #指定需要恢复的索引名称
}
在阿里云ES上创建相同的快照仓库，与自建的ES集群共享同一个oss仓库，完成后即可查看到快照信息
查看当前阿里云ES集群的索引
在阿里云ES上恢复快照，可以看到已经恢复的test和test1
由于阿里云ES存在.kibana索引，恢复快照时需要先关闭.kibana索引，否则会报错
{
"error": {
"root_cause": [
{
"type": "snapshot_restore_exception",
"reason": "[robin_backup:test/oXtFY174RyeKRgYFi_dXKA] cannot restore index [.kibana] because it's open"
}
],
"type": "snapshot_restore_exception",
"reason": "[robin_backup:test/oXtFY174RyeKRgYFi_dXKA] cannot restore index [.kibana] because it's open"
},
"status": 500
}
