docker安装elasticsearch及其客户端
本文将主要记录elasticsearch安装过程中遇到的一些问题
1. 安装配置elasticsearch
(1)docker下载相关镜像
docker pull elasticsearch:7.6.2
(2)创建持久化文件
mkdir -p /mydata/elasticsearch/config
mkdir -p /mydata/elasticsearch/data
初始化配置
echo "http.host: 0.0.0.0" >> /mydata/elasticsearch/config/elasticsearch.yml
注意这里“：”后的空格，否则会报语法错误
(3)启动镜像
docker run --name elasticsearch -p 9200:9200 -p 9300:9300 \
-e "discovery.type=single-node" \
-e ES_JAVA_OPTS="-Xms84m -Xmx512m" \
-v /mydata/elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml \
-v /mydata/elasticsearch/data:/usr/share/elasticsearch/data \
-v /mydata/elasticsearch/plugins:/usr/share/elasticsearch/plugins \
-d elasticsearch:7.6.2
-p:端口映射
-e discovery.type=single-node 单点模式启动
-e ES_JAVA_OPTS="-Xms84m -Xmx512m"：设置启动占用的内存范围（实验环境启动后可能因为云服务器内存过小而占满）
-v 目录挂载
-d 后台运行
启动后使用docker ps查看发现未正常启动，查看启动日志
docker logs elasticsearch
发现是文件拒绝访问异常,为该文件夹设置所有用户都有读写执行权限
chmod -R 777 /mydata/elasticsearch/
重新启动elasticsearch
docker restart elasticsearch
浏览器访问 ip:9200测试，访问成功
2. 安装使用可视化工具
（1）下载同版本镜像
docker pull kibana:7.6.2
（2）初始化配置
mkdir -p /mydata/kibana
touch /mydata/kibana/kibana.yml
vim /mydata/kibana/kibana.yml
server.host: 0.0.0.0
elasticsearch.hosts: http://你的ip:9200
保存退出
（3）启动kibana
docker run --name kibana -v /mydata/kibana/kibana.yml:/usr/share/kibana/config/kibana.yml -p 5601:5601 -d kibana:7.6.2
启动后可通过docker ps查看是否启动成功
等待一段时间后浏览器访问 ip:5601 进行测试
3.SpringBoot中使用Elasticsearch Java Rest Client
（1）导入相关依赖
org.elasticsearch.client
elasticsearch-rest-high-level-client
7.6.2
org.elasticsearch
elasticsearch
7.6.2
org.elasticsearch.client
elasticsearch-rest-client
7.6.2
此处官方文档中只写了导入elasticsearch-rest-high-level-client依赖，但在实际测试运行中会报NoClassDefFoundError错误，检查相关依赖后发现elasticsearch-rest-high-level-client中的elasticsearch依赖并不是7.6.2，因此需要再手工引入对应版本的依赖，导入完成后可正常运行
（2）创建相关Bean
import org.apache.http.HttpHost;
import org.elasticsearch.client.HttpAsyncResponseConsumerFactory;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @Author: 李丰翼
* @DateTime: 2020/7/13 0013 09:36
* @Description: TODO
*/
@Configuration
public class ClientConfig {
public static final RequestOptions COMMON_OPTIONS;
static {
RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();
// builder.addHeader("Authorization", "Bearer " + TOKEN);
// builder.setHttpAsyncResponseConsumerFactory(
// new HttpAsyncResponseConsumerFactory
// .HeapBufferedResponseConsumerFactory(30 * 1024 * 1024 * 1024));
COMMON_OPTIONS = builder.build();
}
@Bean
public RestHighLevelClient esRestClient(){
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(
new HttpHost("127.0.0.1", 9200, "http")
));
return client;
}
}
（3）测试是否正常运行
直接打印client对象看是否成功注入
@SpringBootTest
class GulimallSearchApplicationTests {
@Resource
private RestHighLevelClient client;
@Test
void contextLoads() throws IOException {
System.out.println(client);
}
}
elasticsearch使用教程可参考官方文档
https://www.elastic.co/guide/en/elasticsearch/reference/7.x/query-dsl.html
kibana参考文档
https://www.elastic.co/guide/en/kibana/7.x/introduction.html
Java REST Client参考文档
https://www.elastic.co/guide/en/elasticsearch/client/java-rest/7.x/java-rest-high.html