修改elasticsearch副本数量

目录

• 前言
• 具体实践

前言

我这里的测试机器，单节点ES集群，索引状态一直为yellow，原因可能是副本分片没有正常分配。所以需要手动调整下ES的配置，将索引的副本数设置为0，后面的索引不会设置副本，另外索引的状态也会恢复为green。

具体实践

1.查看索引的副本数和分片数，使用json_pp命令将输出结果转换为json格式

curl -XGET "http://172.16.108.119:9200/_settings"|json_pp 

{
   "test" : {
      "settings" : {
         "index" : {
            "number_of_replicas" : "1",    # 副本数
            "creation_date" : "1667885308646",
            "version" : {
               "created" : "7010099"
            },
            "provided_name" : "test",
            "number_of_shards" : "1",     # 分片数
            "uuid" : "0RbW0paxTjqEw_Rv0psdaA"
         }
      }
   },
   "testindex" : {
      "settings" : {
         "index" : {
            "number_of_replicas" : "1",
            "creation_date" : "1667886384321",
            "version" : {
               "created" : "7010099"
            },
            "provided_name" : "testindex",
            "number_of_shards" : "1",
            "uuid" : "15A8DayoTpqoT78HatP5-Q"
         }
      }
   },
   "testtest" : {
      "settings" : {
         "index" : {
            "number_of_replicas" : "0",
            "creation_date" : "1667886182068",
            "version" : {
               "created" : "7010099"
            },
            "provided_name" : "testtest",
            "number_of_shards" : "1",
            "uuid" : "rZqy77XmRvi-YTRnQQOiwQ"
         }
      }
   }
}

2.获取索引的模板templates

[root@devops03 ~]# curl -XGET "http://172.16.108.119:9200/_cat/templates"

.watch-history-9     [.watcher-history-9*]      2147483647 
.ml-meta             [.ml-meta]                 0          7010099
.monitoring-kibana   [.monitoring-kibana-7-*]   0          7000199
.monitoring-beats    [.monitoring-beats-7-*]    0          7000199
.ml-state            [.ml-state*]               0          7010099
.watches             [.watches*]                2147483647 
.ml-anomalies-       [.ml-anomalies-*]          0          7010099
.monitoring-alerts-7 [.monitoring-alerts-7]     0          7000199
.ml-notifications    [.ml-notifications]        0          7010099
.ml-config           [.ml-config]               0          7010099
index_defaults       [*]                        0          
.logstash-management [.logstash]                0          
.monitoring-logstash [.monitoring-logstash-7-*] 0          7000199
.triggered_watches   [.triggered_watches*]      2147483647 
.monitoring-es       [.monitoring-es-7-*]       0          7000199

3.设置副本数为0，"number_of_replicas": 0

[root@devops03 ~]# curl -XPUT "http://172.16.108.119:9200/_template/index_defaults" -H 'Content-Type: application/json' -d'
{
"template": "*",
"settings": {
"number_of_replicas": 0,
"number_of_shards": 1
    }
}'

4.此时，创建的新索引默认副本数就为0了。

# 创建新索引
[root@devops03 ~]# curl -XPUT "http://172.16.108.119:9200/testnewindex"

# 查看索引副本数
[root@devops03 ~]# curl -XGET "http://172.16.108.119:9200/_settings"|json_pp  
   "testnewindex" : {
      "settings" : {
         "index" : {
            "number_of_replicas" : "0",
            "creation_date" : "1667887446243",
            "version" : {
               "created" : "7010099"
            },
            "provided_name" : "testnewindex",
            "number_of_shards" : "1",
            "uuid" : "sWatJQnRTtigDrJAeyjKog"
         }
      }
   }
}

补充说明：
单个索引临时修改副本数
创建一个只有主分片，没有副本的索引：

[root@devops03 ~]# curl -XPUT "http://172.16.108.119:9200/testindex?pretty" -H 'Content-Type: application/json' -d'
> {
>     "settings": {
>         "number_of_shards" :   1,
>         "number_of_replicas" : 0
>     }
> }
> '

{
  "acknowledged" : true,
  "shards_acknowledged" : true,
  "index" : "testindex"
}

可以用update-index-settingsAPI动态修改副本数：

[root@devops03 ~]# curl -XPUT "http://172.16.108.119:9200/testindex/_settings?pretty" -H 'Content-Type: application/json' -d'
> {
>     "number_of_replicas": 1
> }
> '

{
  "acknowledged" : true
}

查看修改后的副本数：

[root@devops03 ~]# curl -XGET "http://172.16.108.119:9200/_cat/indices?v"

health status index     uuid                   pri rep docs.count docs.deleted store.size pri.store.size
yellow open   testindex xQD99bFNRuKC1wQBwnNojA   1   1          0            0       230b           230b

[root@devops03 ~]# curl -XGET "http://172.16.108.119:9200/_settings"|json_pp 

{
   "testindex" : {
      "settings" : {
         "index" : {
            "number_of_replicas" : "1",
            "creation_date" : "1667889490896",
            "version" : {
               "created" : "7010099"
            },
            "provided_name" : "testindex",
            "number_of_shards" : "1",
            "uuid" : "xQD99bFNRuKC1wQBwnNojA"
         }
      }
   }
}