ES服务linux搭建

• 下载安装包
• ES安装
• java测试样例

es官网下载 https://www.elastic.co/cn/downloads/elasticsearch
随心情选择一个版本即可

1. 新增用户，es不支持root用户操作

useradd es
passwd es

2. 修改系统配置

vi /etc/sysctl.conf

在最后增加vm.max_map_count=262144，保存退出

vi /etc/security/limits.conf

修改或增加以下内容

* hard nofile 65536
* soft nofile 65536
* soft nproc 2048
* hard nproc 4096

3. 切换到es用户安装es
   将从官网下载的压缩包上传到服务器并解压缩

4. 更改es配置
   es安装目录下config文件夹，修改elasticsearch.yml文件。

network.host: 0.0.0.0  #也可换成内网ip，不可使用公网ip
network.publish_host: xx.xx.xx.xx   #公网ip
http.port: 9200  #默认端口9200
cluster.name: es-study  #集群名称，随便起一个就行

5. 启动es
   进入到根目录下bin文件夹

nohup ./elasticsearch >1.log  2>&1 &

打开1.log文件，能看到当前的启动日志，看到started基本就好啦

[2021-12-29T13:42:21,325][DEBUG][o.e.a.ActionModule       ] Using REST wrapper from plugin org.elasticsearch.xpack.security.Security
[2021-12-29T13:42:21,703][INFO ][o.e.d.DiscoveryModule    ] [node-1] using discovery type [single-node]
[2021-12-29T13:42:22,518][INFO ][o.e.n.Node               ] [node-1] initialized
[2021-12-29T13:42:22,518][INFO ][o.e.n.Node               ] [node-1] starting ...
[2021-12-29T13:42:22,694][INFO ][o.e.t.TransportService   ] [node-1] publish_address {公网ip:9300}, bound_addresses {内网ip:9300}
[2021-12-29T13:42:22,812][INFO ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [node-1] publish_address {公网ip:9200}, bound_addresses {内网ip:9200}
[2021-12-29T13:42:22,812][INFO ][o.e.n.Node               ] [node-1] started
[2021-12-29T13:42:23,241][INFO ][o.e.c.s.ClusterSettings  ] [node-1] updating [xpack.monitoring.collection.enabled] from [false] to [true]
[2021-12-29T13:42:23,594][WARN ][o.e.x.s.a.s.m.NativeRoleMappingStore] [node-1] Failed to clear cache for realms [[]]

public static void main(String[] args) throws UnknownHostException {
        Settings settings = Settings.builder().put("cluster.name","es-study")
                .build();
        //构建client
        TransportClient client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new TransportAddress(InetAddress.getByName("公网ip"), 9300));


        try {
            SearchRequest request = new SearchRequest();
            request.indices("xxx");
            request.types("popular");

            SearchSourceBuilder search = new SearchSourceBuilder();
            search.query(QueryBuilders.matchQuery("songsName", "test"));
            search.timeout(new Timevalue(2000, TimeUnit.MILLISECONDS));

            request.source(search);

            ActionFuture search1 = client.search(request);
            SearchResponse searchResponse = search1.get();

            SearchHits hits = searchResponse.getHits();
            SearchHit[] hitArr = hits.getHits();
            Arrays.stream(hitArr).forEach(hit -> {
                System.out.println(hit.getType() + "," + hit.getScore());
                System.out.println("sourceAsString:" + hit.getSourceAsString());
            });

        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        } finally {
            client.close();
        }

    }