elasticsearch 7.6 alias 的日常操作

系统管理员 2022-08-29 00:12 166阅读 0赞

os: centos 7.6  
es: 7.6

alias 可以理解为 index 的别名，方便索引的操作，尤其是在重建时。

一个 index 可以接受多个 alias，而一个 alias 也可以映射到多个 index

当一个 alias 映射到多个 index 时，是无法对 alias 进行写操作。

# 版本 #

# cat /etc/centos-release
    CentOS Linux release 7.6.1810 (Core)
    
    # yum list installed |grep -i elasticsearch
    elasticsearch.x86_64               7.6.2-1                             installed
    
    
    # cat /etc/hosts
    127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    
    192.168.56.211  n1
    192.168.56.212  n2
    192.168.56.213  n3
    192.168.56.214  n4

# 创建索引 #

curl -X PUT 'http://192.168.56.211:9200/testindex1' -H 'Content-Type: application/json' -d ' 
    {
        "settings": {
         "number_of_shards": 8,
    	 "number_of_replicas" : 2
        }
    }
    '

curl -X PUT 'http://192.168.56.211:9200/testindex2' -H 'Content-Type: application/json' -d ' 
    {
        "settings": {
         "number_of_shards": 8,
    	 "number_of_replicas" : 2
        }
    }
    '

curl -X PUT 'http://192.168.56.211:9200/testindex3' -H 'Content-Type: application/json' -d ' 
    {
        "settings": {
         "number_of_shards": 8,
    	 "number_of_replicas" : 2
        }
    }
    '

http://192.168.56.211:9200/\_cat/indices?v  
![在这里插入图片描述][7b46e8a1ab1d4f98a243a2ac29a46084.png]

http://192.168.56.211:9200/\_cat/aliases?v  
![在这里插入图片描述][265774ffe0ca442ba10a9c946d592043.png]

# 新增 alias #

通常情况下，一个 alias 对应一个 index

curl -X POST 'http://192.168.56.211:9200/_aliases' -H 'Content-Type: application/json' -d ' 
    {
        "actions" : [
            { "add" : { "index" : "testindex1", "alias" : "testalias1" } }
        ]
    }
    '

http://192.168.56.211:9200/\_cat/aliases?v  
![在这里插入图片描述][8a88448a39db4054856b0a8c15f31233.png]

# 删除 alias #

curl -X POST 'http://192.168.56.211:9200/_aliases' -H 'Content-Type: application/json' -d ' 
    {
        "actions" : [
            { "remove" : { "index" : "testindex1", "alias" : "testalias1" } }
        ]
    }
    '

http://192.168.56.211:9200/\_cat/aliases?v  
![在这里插入图片描述][9d236f58696b4ddab96c8202953ca15d.png]

# 重定向 alias #

多用于重建索引后的指向

curl -X POST 'http://192.168.56.211:9200/_aliases' -H 'Content-Type: application/json' -d ' 
    {
        "actions" : [
            { "add" : { "index" : "testindex2", "alias" : "testalias1" } },
    		{ "remove" : { "index" : "testindex1", "alias" : "testalias1" } }
        ]
    }
    '

http://192.168.56.211:9200/\_cat/aliases?v

# alias 增加多个 index #

curl -X POST 'http://192.168.56.211:9200/_aliases' -H 'Content-Type: application/json' -d ' 
    {
        "actions" : [
            { "add" : { "index" : "testindex2", "alias" : "testalias1" } },
    		{ "add" : { "index" : "testindex1", "alias" : "testalias1" } },
    		{ "add" : { "index" : "testindex3", "alias" : "testalias1" } }
        ]
    }
    '

http://192.168.56.211:9200/\_cat/aliases?v

根据 alias 查找 index

curl -X GET "http://192.168.56.211:9200/*/_alias/testalias2?pretty"

根据 index 查找 alias

curl -X GET "http://192.168.56.211:9200/testindex2/_alias/*?pretty"

[7b46e8a1ab1d4f98a243a2ac29a46084.png]: /images/20220829/882d3b66324f41a5b9e7fb1cc1e8c42a.png
[265774ffe0ca442ba10a9c946d592043.png]: /images/20220829/80f89722210d4b078ba2ddbef186b13c.png
[8a88448a39db4054856b0a8c15f31233.png]: /images/20220829/0120ddbc08d541d0b9b7e2b11bfa8244.png
[9d236f58696b4ddab96c8202953ca15d.png]: /images/20220829/45fe1685e98e4d5aaaefb62108f4427f.png