elasticsearch 安装
es从6以后版本一个index下面只能有一个type（即默认索引类型_doc），后期7版本中要把type去掉
elasticsearch7默认不在支持指定索引类型，默认索引类型是_doc，如果想改变，则配置include_type_name: true ，建议不要这么做，因为elasticsearch8后就不在提供该字段，官方文档：https://www.elastic.co/guide/en/elasticsearch/reference/current/removal-of-types.html
一、系统环境
操作系统:CentOS Linux release 7.3
elasticsearch：elasticsearch-7.0.0
修改/etc/hosts
192.168.1.12 es1 node2 node2.xkq.com
192.168.1.13 es2 node3 node3.xkq.com
192.168.1.14 es3 node4 node4.xkq.com
vi /etc/security/limits.conf
es - nofile 65535
es soft nproc 65535
es hard nproc 65535
ulimit -a #查看当前用户的资源限制
ulimit #暂时修改，切换到该用户es，ulimit -n 65535
配置虚拟内存
sysctl -w vm.max_map_count=262144 #临时修改该值
vim /etc/sysctl.conf #永久修改
vm.max_map_count=262144
配置好java
二、安装配置
useradd es
su - es
tar -zxvf elasticsearch-7.0.0-linux-x86_64.tar.gz -C /usr/local/
cd /usr/local
ln -s elasticsearch-7.0.0 es7
vi /usr/local/es7/config/elasticsearch.yml
cluster.name: es-cluster
node.name: es1
network.host: 0.0.0.0#允许外部访问的地址
discovery.seed_hosts: ["es1", "es2","es3"]
cluster.initial_master_nodes: ["es1", "es2","es3"]
http.cors.enabled: true
http.cors.allow-origin: "*"
三、启动
su - es
/usr/local/es/bin/elasticsearch -d
四、常用命令
（1）、_cat操作
_cat系列提供了一系列查询elasticsearch集群状态的接口。你可以通过执行
curl -XGET localhost:9200/_cat
获取所有_cat系列的操作
/_cat/allocation
/_cat/shards
/_cat/shards/{index}
/_cat/master
/_cat/nodes
/_cat/indices
/_cat/indices/{index}
/_cat/segments
/_cat/segments/{index}
/_cat/count
/_cat/count/{index}
/_cat/recovery
/_cat/recovery/{index}
/_cat/health
/_cat/pending_tasks
/_cat/aliases
/_cat/aliases/{alias}
/_cat/thread_pool
/_cat/plugins
/_cat/fielddata
/_cat/fielddata/{fields}
（2）：_cluster系列
1、查询设置集群状态
curl -XGET localhost:9200/_cluster/health?pretty=true
pretty=true表示格式化输出
level=indices 表示显示索引状态
level=shards 表示显示分片信息
2、curl -XGET localhost:9200/_cluster/stats?pretty=true
显示集群系统信息，包括CPU JVM等等
3、curl -XGET localhost:9200/_cluster/state?pretty=true
集群的详细信息。包括节点、分片等。
3、curl -XGET localhost:9200/_cluster/pending_tasks?pretty=true
获取集群堆积的任务
3、修改集群配置
举例：
curl -XPUT localhost:9200/_cluster/settings -d ‘{
“persistent” : {
“discovery.zen.minimum_master_nodes” : 2
}
}’
transient 表示临时的，persistent表示永久的
4、curl -XPOST ‘localhost:9200/_cluster/reroute’ -d ‘xxxxxx’
对shard的手动控制，参考http://zhaoyanblog.com/archives/687.html
5、关闭节点
关闭指定192.168.1.1节点
curl -XPOST ‘http://192.168.1.1:9200/_cluster/nodes/_local/_shutdown’
curl -XPOST ‘http://localhost:9200/_cluster/nodes/192.168.1.1/_shutdown’
关闭主节点
curl -XPOST ‘http://localhost:9200/_cluster/nodes/_master/_shutdown’
关闭整个集群
$ curl -XPOST ‘http://localhost:9200/_shutdown?delay=10s’
$ curl -XPOST ‘http://localhost:9200/_cluster/nodes/_shutdown’
$ curl -XPOST ‘http://localhost:9200/_cluster/nodes/_all/_shutdown’
delay=10s表示延迟10秒关闭
（3）：_nodes系列
curl -XGET ‘http://localhost:9200/_nodes/stats?pretty=true’
curl -XGET ‘http://localhost:9200/_nodes/192.168.1.2/stats?pretty=true’
curl -XGET ‘http://localhost:9200/_nodes/process’
curl -XGET ‘http://localhost:9200/_nodes/_all/process’
curl -XGET ‘http://localhost:9200/_nodes/192.168.1.2,192.168.1.3/jvm,process’
curl -XGET ‘http://localhost:9200/_nodes/192.168.1.2,192.168.1.3/info/jvm,process’
curl -XGET ‘http://localhost:9200/_nodes/192.168.1.2,192.168.1.3/_all
curl -XGET ‘http://localhost:9200/_nodes/hot_threads
（4）索引操作
http://localhost:9200/_cat/indices?
curl -XGET ‘http://localhost:9200/{index}/{type}/{id}’
1、创建索引
a.方法一
curl -XPUT http://192.168.1.12:9200/my_new_index1?pretty
curl -H "Content-Type: application/json" -XPUT http://192.168.1.12:9200/my_new_index1/user/1?pretty -d '{"name":"张三","age":"23"}'
http://192.168.1.12:9200/my_new_index1/user/1
http://192.168.1.12:9200/my_new_index1/user/_search?pretty
b.方法二
curl -H "Content-Type: application/json" -XPUT http://192.168.1.12:9200/shop/ -d '
{
"settings": {
"number_of_shards": 3,
"number_of_replicas": 2
}
}'
elasticsearch7默认不在支持指定索引类型，默认索引类型是_doc，如果想改变，则配置include_type_name: true 建议不要这么做，因为elasticsearch8后就不在提供该字段，官方文档：https://www.elastic.co/guide/en/elasticsearch/reference/current/removal-of-types.html
curl -H "Content-Type: application/json" -XPUT http://192.168.1.12:9200/shop/_mapping/good1?include_type_name=true -d '
{"properties": {
"title": {
"type": "text"
},
"price": {
"type": "float"
},
"stock": {
"type": "integer"
}
}
}'
http://192.168.1.12:9200/shop/good1/1?pretty
http://192.168.1.12:9200/shop/good1/_search?pretty
c.方法三
curl -H "Content-Type: application/json" -XPUT http://192.168.1.12:9200/shop6?pretty -d '
{"settings": {
"number_of_shards": 3,
"number_of_replicas": 2
},
"mappings": {
"properties" :{
"title": {
"type": "text"
},
"price": {
"type": "float"
},
"stock": {
"type": "integer"
}
}
}
}'
curl -H "Content-Type: application/json" -XPUT http://192.168.1.12:9200/shop6/_doc/1?pretty -d '
{"title":"qqqqqqqqq","price":12,"stock":11}'
批量增加
curl -H "Content-Type: application/json" -PUT http://192.168.1.12:9200/shop6/_bulk?pretty --data-binary "@/tmp/add.json"
vi /tmp/add.json
{"index":{}}
{"title":"qqqqqqqq12","price":12,"stock":11}
{"index":{}}
{"title":"qqqqqqqqq23","price":12,"stock":11}'
{"index":{}}
http://192.168.1.12:9200/shop6/_doc/1?pretty
http://192.168.1.12:9200/shop6/_doc/_search?pretty
3、删除索引
curl -XDELETE ‘http://localhost:9200/{index}/{type}/{id}’
DELETE /my_index
DELETE /index_one,index_two
DELETE /index_*
DELETE /_all
4、设置mapping
5、获取mapping
curl -XGET http://localhost:9200/{index}/{type}/_mapping?pretty
6、搜索
