k8s容器内部应用向eruaka注册ip问题

朱雀 2023-02-22 08:21 177阅读 0赞

springboot项目部署到k8s中，发现eruaka注册是容器id，这个其他应用是无法访问的  
![1][]  
参考[Spring Cloud配置ip注册找不到$\{spring.cloud.client.ipAddress\}][Spring Cloud_ip_spring.cloud.client.ipAddress],现在`pom.xml`中添加：

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-commons</artifactId>
            </dependency>

接着使用`${spring.cloud.client.ip-address}`

eureka:
      instance:
        instance-id: ${ spring.cloud.client.ip-address}:
        preferIpAddress: true
        statusPageUrlPath: /actuator/info
        healthCheckUrlPath: /actuator/health
      client:
        service-url:
          defaultZone: http://192.168.5.207:8761/eureka/,http://192.168.5.180:8761/eureka/,http://192.168.5.154:8761/eureka/

确实替换为id了，但是确实容器IP，并不是主机IP，外部还是无法访问.  
![1][1 1]  
在k8s中设置`spring.cloud.client.ip-address`和`k8s.port`的环境变量，  
![1][1 2]  
在eruaka中看似是对的，点击链接打开的还是`http://179.20.3.178:9010/actuator/info`，依旧是容器ip和端口，  
![1][1 3]  
然而使用使用主机的IP和端口却可以访问.  
![1][1 4]  
这两者之前的不一致问题，怎么解决呢？如果了解k8s的网络模式，[\[k8s\]k8s pod的4种网络模式最佳实战(externalIPs )][k8s_k8s pod_4_externalIPs]，解决办法就知道了。设置`hostNetwork: true`问题就解决了。就不用什么instance-id![1][1 5]  
再看eruaka，就可以正常访问了  
![1][1 6]  
使用`hostNetwork`有弊端，会出现端口占用，故这里推荐使用下图的方式，使用`EUREKA_INSTANCE_IP-ADDRESS`环境变量即可，处理方式跟[k8s中dubbo注册IP问题][k8s_dubbo_IP]一致  
![1][1 7]  
当系统部署到生产环境，这里还有个dns的问题，你会发现docker内部无法访问域名

dnsConfig:
            nameservers:
              - 223.5.5.5
    `![1](https://img-blog.csdnimg.cn/20200724171135366.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhcnJhaA==,size_16,color_FFFFFF,t_70)
    ``

[1]: https://img-blog.csdnimg.cn/20200702165043775.png
[Spring Cloud_ip_spring.cloud.client.ipAddress]: https://www.jianshu.com/p/5ad8317961b7
[1 1]: https://img-blog.csdnimg.cn/2020070216543934.png
[1 2]: https://img-blog.csdnimg.cn/20200703091022777.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhcnJhaA==,size_16,color_FFFFFF,t_70
[1 3]: https://img-blog.csdnimg.cn/20200703091153846.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhcnJhaA==,size_16,color_FFFFFF,t_70
[1 4]: https://img-blog.csdnimg.cn/20200703091656752.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhcnJhaA==,size_16,color_FFFFFF,t_70
[k8s_k8s pod_4_externalIPs]: https://www.cnblogs.com/iiiiher/p/8051947.html
[1 5]: https://img-blog.csdnimg.cn/20200703093704236.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhcnJhaA==,size_16,color_FFFFFF,t_70
[1 6]: https://img-blog.csdnimg.cn/20200703093852734.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhcnJhaA==,size_16,color_FFFFFF,t_70
[k8s_dubbo_IP]: https://blog.csdn.net/warrah/article/details/106923454
[1 7]: https://img-blog.csdnimg.cn/202007061359565.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dhcnJhaA==,size_16,color_FFFFFF,t_70