nacos入门

部署

这是全部了

nacos/nacos-server - Docker Image | Docker Hub 

1
2
3
4
docker run --name nacos -e MODE=standalone -p 8849:8848 -d -e SPRING_
DATASOURCE_PLATFORM=mysql -e MYSQL_SERVICE_HOST=sdadgz.cn -e MYSQL_SERVICE_PORT=3307 -e MYSQL_SERVICE_DB_NAME=nacos -e M
YSQL_SERVICE_USER=root -e MYSQL_SERVICE_PASSWORD=sdadgz.cn -e JVM_XMS=840m -e JVM_XMX=840m -e TZ="Asia/Shanghai" -e LC_A
LL=en.UTF-8 -v /www/www.sdadgz.cn/nacos/:/home/nacos/ --network website_net nacos/nacos-server:1.4.2

mysql配置

初始化数据库

去官网找RELEASE下载，在conf里找nacos-mysql.sql

注册与发现

依赖

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
<!--    nacos discovery   -->
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<!--    nacos负载均衡    -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>
<!--    feign    -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

yaml配置

1
2
3
4
5
6
7
8
9
10
11
12
server:
  port: 8000
spring:
  application:
    name: demo
  cloud:
    nacos:
      server-addr: sdadgz.cn:8849
      username: nacos
      password: sdadgz.cn
      discovery:
        namespace: 85198eed-65a8-4c00-9547-76fa3d77e973 # 手动去创建一个命名空间，name用作查看，id用作这里，手动创建多少有点不讲究啊，官网有api

启动项，别忘了soringboot依赖

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
package cn.sdadgz;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @author sdadgz
 * @since 2023/2/12
 */
@SpringBootApplication
@EnableFeignClients // 重中之重
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

feign包，来自其他服务的接口

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
package cn.sdadgz.feign;

import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author sdadgz
 * @since 2023/2/13
 */

@FeignClient(name = "demo-02",path = "/test")
public interface TestService {

    @GetMapping("/m")
    String m();

}

controller包

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
package cn.sdadgz.controller;

import cn.sdadgz.feign.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author sdadgz
 * @since 2023/2/12
 */

@RestController
@RequestMapping("/test")
public class TestController {

    // 其他服务
    @Resource
    private TestService testService;

    @GetMapping("/hello")
    public String test(){
        // 就像自己人一样调用
        String m = testService.m();
        return "hello world:" + m;
    }
    
}

配置中心

依赖

1
2
3
4
5
6
7
8
<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>

bootstrap.yaml，别自己造名字，别仍application里

config命名规范 *.yaml

1
2
3
4
5
6
7
8
9
10
11
12
13
spring:
  cloud:
    nacos:
      server-addr: sdadgz.cn:8849
      username: nacos
      password: sdadgz.cn
      config:
        namespace: test
        file-extension: yaml # 重中之重
        shared-configs: [config数组] # 低优先级 d进去自己看格式
        extension-configs: [config数组] # 高优先级
  application:
    name: config

application.yaml

1
2
3
4
5
6
7
server:
  port: 9000
spring:
  cloud:
    nacos:
      discovery:
        namespace: test

注解

  • @Value(“${[my.config]}”) // 配置中心取值
  • @RefreshScope // 让上面的值实时同步

问题

nacos负载均衡报错

自某个版本之后。。。反正需要手动加个依赖了，其他的照官网抄就完事了

1
2
3
4
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>

nacos配置中心启动报错

同上，他妈的

1
2
3
4
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>