3.Elasticsearch系列--安装

Elasticsearch-7.4.2

Install Elasticsearch with RPM

rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch
/etc/yum.repos.d/elasticsearch.repo
[elasticsearch-7.x]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md

sudo yum install elasticsearch

sudo chkconfig --add elasticsearch

sudo systemctl start elasticsearch.service
sudo systemctl stop elasticsearch.service

[root@JhouShuai elasticsearch]# curl -X GET "localhost:9200/?pretty"

修改config目录下的jvm.options

vim jvm.options
# Xms represents the initial size of total heap space
# Xmx represents the maximum size of total heap space

#-Xms1g
#-Xmx1g
-Xms100m
-Xmx100m

修改config目录下elasticsearch.yml文件

#network.host: 192.168.0.1
#允许任意IP访问
network.host: 0.0.0.0

#http.port: 9200
#修改开放的端口
http.port: 9200

#cluster.initial_master_nodes: ["node-1", "node-2"]
#########这是为解决错误儿添加的 如果没有这个错误请不要添加这个以防出现问题############
##the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] #must be configured
cluster.initial_master_nodes: ["node-1"]

# 最后添加跨域
http.cors.enabled: true
http.cors.allow-origin: "*"

安装问题参考资料Elasticsearch系列--安装

查看健康状态

curl -X GET 127.0.0.1:9200/_cat/health?v

[root@JhouShuai elasticsearch]# curl -X GET 127.0.0.1:9200/_cat/health?v 
epoch      timestamp cluster       status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1573995159 12:52:39  elasticsearch green           1         1      0   0    0    0        0             0                  -                100.0%
[root@JhouShuai elasticsearch]# 

查询当前es集群中所有的indices

curl -X GET 127.0.0.1:9200/_cat/indices?v

[root@JhouShuai elasticsearch]# curl -X GET 127.0.0.1:9200/_cat/indices?v 
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size

创建索引

curl -X PUT 127.0.0.1:9200/www

[root@JhouShuai elasticsearch]# curl -X PUT 127.0.0.1:9200/www 
{"acknowledged":true,"shards_acknowledged":true,"index":"www"}

删除索引

[root@JhouShuai elasticsearch]# curl -X DELETE 127.0.0.1:9200/www 
{"acknowledged":true}

插入记录

[root@JhouShuai elasticsearch]# curl -H "Content-Type:application/json" -X POST 127.0.0.1:9200/user/person -d '{"name": "dsb","age": 9000,"married": true}'
输出：
{
    "_index": "user",
    "_type": "person",
    "_id": "BPZ5eW4BMLuK5HFc0E3a",
    "_version": 1,
    "result": "created",
    "_shards": {
        "total": 2,
        "successful": 1,
        "failed": 0
    },
    "_seq_no": 0,
    "_primary_term": 1
}

检索

Elasticsearch的检索语法比较特别，使用GET方法携带JSON格式的查询条件

• curl -X GET 127.0.0.1:9200/user/person/_search

{
    "took": 501,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 2,
            "relation": "eq"
        },
        "max_score": 1.0,
        "hits": [
            {
                "_index": "user",
                "_type": "person",
                "_id": "BPZ5eW4BMLuK5HFc0E3a",
                "_score": 1.0,
                "_source": {
                    "name": "dsb",
                    "age": 9000,
                    "married": true
                }
            },
            {
                "_index": "user",
                "_type": "person",
                "_id": "4",
                "_score": 1.0,
                "_source": {
                    "name": "sb",
                    "age": 9,
                    "married": false
                }
            }
        ]
    }
}