|
| 1 | +# Spring Cloud 服务发现/注册 |
| 2 | + |
| 3 | + |
| 4 | + |
| 5 | +## Spring Cloud Netflix Eureka |
| 6 | + |
| 7 | + |
| 8 | + |
| 9 | +### Eureka 服务器 |
| 10 | + |
| 11 | + |
| 12 | + |
| 13 | +#### 引入 Maven 依赖 |
| 14 | + |
| 15 | + |
| 16 | + |
| 17 | +```xml |
| 18 | +<dependency> |
| 19 | + <groupId>org.springframework.cloud</groupId> |
| 20 | + <artifactId>spring-cloud-starter-eureka-server</artifactId> |
| 21 | +</dependency> |
| 22 | +``` |
| 23 | + |
| 24 | + |
| 25 | + |
| 26 | +#### 激活 Eureka 服务器 |
| 27 | + |
| 28 | + |
| 29 | + |
| 30 | +```java |
| 31 | +package com.segumentfault.springcloudlesson4eurekaserver; |
| 32 | + |
| 33 | +import org.springframework.boot.SpringApplication; |
| 34 | +import org.springframework.boot.autoconfigure.SpringBootApplication; |
| 35 | +import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; |
| 36 | + |
| 37 | +@SpringBootApplication |
| 38 | +@EnableEurekaServer |
| 39 | +public class SpringCloudLesson4EurekaServerApplication { |
| 40 | + |
| 41 | + public static void main(String[] args) { |
| 42 | + SpringApplication.run(SpringCloudLesson4EurekaServerApplication.class, args); |
| 43 | + } |
| 44 | +} |
| 45 | +``` |
| 46 | + |
| 47 | + |
| 48 | + |
| 49 | +#### 调整 Eureka 服务器配置 |
| 50 | + |
| 51 | +`application.properties` |
| 52 | + |
| 53 | +```properties |
| 54 | +## Spring Cloud Eureka 服务器应用名称 |
| 55 | +spring.application.name = spring-cloud-eureka-server |
| 56 | + |
| 57 | +## Spring Cloud Eureka 服务器服务端口 |
| 58 | +server.port = 9090 |
| 59 | + |
| 60 | +## 管理端口安全失效 |
| 61 | +management.security.enabled = false |
| 62 | +``` |
| 63 | + |
| 64 | + |
| 65 | + |
| 66 | +#### 检验 Eureka Server |
| 67 | + |
| 68 | +异常堆栈信息: |
| 69 | + |
| 70 | +``` |
| 71 | +[nfoReplicator-0] c.n.discovery.InstanceInfoReplicator : There was a problem with the instance info replicator |
| 72 | +
|
| 73 | +com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server |
| 74 | +``` |
| 75 | + |
| 76 | + |
| 77 | + |
| 78 | +http://localhost:9090/ |
| 79 | + |
| 80 | +运行效果: |
| 81 | + |
| 82 | +># Instances currently registered with Eureka |
| 83 | +
|
| 84 | + |
| 85 | + |
| 86 | +问题原因:Eureka Server 既是注册服务器,也是客户端,默认情况,也需要配置注册中心地址。 |
| 87 | + |
| 88 | +> "description": "Spring Cloud Eureka Discovery Client" |
| 89 | +
|
| 90 | + |
| 91 | + |
| 92 | +#### 解决问题的方法 |
| 93 | + |
| 94 | +```properties |
| 95 | +## Spring Cloud Eureka 服务器作为注册中心 |
| 96 | +## 通常情况下,不需要再注册到其他注册中心去 |
| 97 | +## 同时,它也不需要获取客户端信息 |
| 98 | +### 取消向注册中心注册 |
| 99 | +eureka.client.register-with-eureka = false |
| 100 | +### 取消向注册中心获取注册信息(服务、实例信息) |
| 101 | +eureka.client.fetch-registry = false |
| 102 | +## 解决 Peer / 集群 连接问题 |
| 103 | +eureka.instance.hostname = localhost |
| 104 | +eureka.client.serviceUrl.defaultZone = http://${eureka.instance.hostname}:${server.port}/eureka |
| 105 | +``` |
| 106 | + |
| 107 | + |
| 108 | + |
| 109 | + |
| 110 | + |
| 111 | +### Eureka 客户端 |
| 112 | + |
| 113 | + |
| 114 | + |
| 115 | +#### 引入 Maven 依赖 |
| 116 | + |
| 117 | +```xml |
| 118 | +<dependency> |
| 119 | + <groupId>org.springframework.cloud</groupId> |
| 120 | + <artifactId>spring-cloud-starter-eureka</artifactId> |
| 121 | +</dependency> |
| 122 | +``` |
| 123 | + |
| 124 | + |
| 125 | + |
| 126 | +#### 激活 Eureka 客户端 |
| 127 | + |
| 128 | + |
| 129 | + |
| 130 | +```java |
| 131 | +package com.segumentfault.springcloudlesson4eurekaclient; |
| 132 | + |
| 133 | +import org.springframework.boot.SpringApplication; |
| 134 | +import org.springframework.boot.autoconfigure.SpringBootApplication; |
| 135 | +import org.springframework.cloud.client.discovery.EnableDiscoveryClient; |
| 136 | +import org.springframework.cloud.netflix.eureka.EnableEurekaClient; |
| 137 | + |
| 138 | +@SpringBootApplication |
| 139 | +@EnableEurekaClient |
| 140 | +//@EnableDiscoveryClient |
| 141 | +public class SpringCloudLesson4EurekaClientApplication { |
| 142 | + |
| 143 | + public static void main(String[] args) { |
| 144 | + SpringApplication.run(SpringCloudLesson4EurekaClientApplication.class, args); |
| 145 | + } |
| 146 | +} |
| 147 | +``` |
| 148 | + |
| 149 | + |
| 150 | + |
| 151 | +#### 配置 Eureka 客户端 |
| 152 | + |
| 153 | +```properties |
| 154 | +## Spring Cloud Eureka 客户端应用名称 |
| 155 | +spring.application.name = spring-cloud-eureka-client |
| 156 | + |
| 157 | +## Spring Cloud Eureka 客户端服务端口 |
| 158 | +server.port = 8080 |
| 159 | + |
| 160 | +## 管理端口安全失效 |
| 161 | +management.security.enabled = false |
| 162 | +``` |
| 163 | + |
| 164 | + |
| 165 | + |
| 166 | +#### 检验 Eureka 客户端 |
| 167 | + |
| 168 | +发现与 Eureka 服务器控制台出现相同异常: |
| 169 | + |
| 170 | +``` |
| 171 | +[nfoReplicator-0] c.n.discovery.InstanceInfoReplicator : There was a problem with the instance info replicator |
| 172 | +
|
| 173 | +com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server |
| 174 | +``` |
| 175 | + |
| 176 | + |
| 177 | + |
| 178 | +#### 需要再次调整 Eureka 客户端配置 |
| 179 | + |
| 180 | + |
| 181 | + |
| 182 | +```properties |
| 183 | +## Spring Cloud Eureka 客户端应用名称 |
| 184 | +spring.application.name = spring-cloud-eureka-client |
| 185 | + |
| 186 | +## Spring Cloud Eureka 客户端服务端口 |
| 187 | +server.port = 8080 |
| 188 | + |
| 189 | +## 管理端口安全失效 |
| 190 | +management.security.enabled = false |
| 191 | + |
| 192 | +## Spring Cloud Eureka 客户端 注册到 Eureka 服务器 |
| 193 | +eureka.client.serviceUrl.defaultZone = http://localhost:9090/eureka |
| 194 | +``` |
| 195 | + |
| 196 | + |
| 197 | + |
| 198 | + |
| 199 | + |
| 200 | +### Spring Cloud Config 与 Eureka 整合 |
| 201 | + |
| 202 | + |
| 203 | + |
| 204 | +#### 调整 `spring-cloud-config-server` 作为 Eureka 客户端 |
| 205 | + |
| 206 | + |
| 207 | + |
| 208 | +#### 引入 Maven 依赖 |
| 209 | + |
| 210 | +```xml |
| 211 | +<dependency> |
| 212 | + <groupId>org.springframework.cloud</groupId> |
| 213 | + <artifactId>spring-cloud-starter-eureka</artifactId> |
| 214 | +</dependency> |
| 215 | +``` |
| 216 | + |
| 217 | + |
| 218 | + |
| 219 | +#### 激活 Eureka 客户端 |
| 220 | + |
| 221 | +```java |
| 222 | +package com.segmentfault.springcloudlesson4configserver; |
| 223 | + |
| 224 | +import org.springframework.boot.SpringApplication; |
| 225 | +import org.springframework.boot.autoconfigure.SpringBootApplication; |
| 226 | +import org.springframework.cloud.client.discovery.EnableDiscoveryClient; |
| 227 | +import org.springframework.cloud.config.server.EnableConfigServer; |
| 228 | + |
| 229 | +@SpringBootApplication |
| 230 | +@EnableConfigServer |
| 231 | +@EnableDiscoveryClient |
| 232 | +public class SpringCloudLesson4ConfigServerApplication { |
| 233 | + |
| 234 | + public static void main(String[] args) { |
| 235 | + SpringApplication.run(SpringCloudLesson4ConfigServerApplication.class, args); |
| 236 | + } |
| 237 | +} |
| 238 | +``` |
| 239 | + |
| 240 | + |
| 241 | + |
| 242 | +#### 调整 `spring-cloud-config-server` 配置 |
| 243 | + |
| 244 | + |
| 245 | + |
| 246 | +```properties |
| 247 | +## 配置服务器应用名称 |
| 248 | +spring.application.name = spring-cloud-config-server |
| 249 | + |
| 250 | +## 配置服务器端口 |
| 251 | +server.port = 7070 |
| 252 | + |
| 253 | +## 关闭管理端actuator 的安全 |
| 254 | +## /env /health 端口完全开放 |
| 255 | +management.security.enabled = false |
| 256 | + |
| 257 | +## 配置服务器文件系统git 仓库 |
| 258 | +## ${user.dir} 减少平台文件系统的不一致 |
| 259 | +# spring.cloud.config.server.git.uri = ${user.dir}/src/main/resources/configs |
| 260 | + |
| 261 | +## 配置服务器远程 Git 仓库(GitHub) |
| 262 | +spring.cloud.config.server.git.uri = https://github.com/mercyblitz/tmp |
| 263 | + |
| 264 | +## 强制拉去 Git 内容 |
| 265 | +spring.cloud.config.server.git.force-pull = true |
| 266 | + |
| 267 | +## spring-cloud-config-server 注册到 Eureka 服务器 |
| 268 | +eureka.client.serviceUrl.defaultZone = http://localhost:9090/eureka |
| 269 | +``` |
| 270 | + |
| 271 | + |
| 272 | + |
| 273 | +#### 调整 `spring-cloud-eureka-client` 称为 Config 客户端 |
| 274 | + |
| 275 | +##### 引入 `spring-cloud-starter-config` Maven 依赖 |
| 276 | + |
| 277 | +```xml |
| 278 | +<dependency> |
| 279 | + <groupId>org.springframework.cloud</groupId> |
| 280 | + <artifactId>spring-cloud-starter-config</artifactId> |
| 281 | +</dependency> |
| 282 | +``` |
| 283 | + |
| 284 | +##### 创建 `bootstrap.properties` |
| 285 | + |
| 286 | +##### 配置 Config 客户端配置 |
| 287 | + |
| 288 | +`bootstrap.properties`: |
| 289 | + |
| 290 | +```properties |
| 291 | +## 配置客户端应用关联的应用 |
| 292 | +## spring.cloud.config.name 是可选的 |
| 293 | +## 如果没有配置,采用 ${spring.application.name} |
| 294 | +spring.cloud.config.name = segmentfault |
| 295 | +## 关联 profile |
| 296 | +spring.cloud.config.profile = prod |
| 297 | +## 关联 label |
| 298 | +spring.cloud.config.label = master |
| 299 | +## 激活 Config 服务器发现 |
| 300 | +spring.cloud.config.discovery.enabled = true |
| 301 | +## 配置 Config 服务器的应用名称(Service ID) |
| 302 | +spring.cloud.config.discovery.serviceId = spring-cloud-config-server |
| 303 | +``` |
| 304 | + |
| 305 | + |
| 306 | + |
| 307 | +##### 检验效果 |
| 308 | + |
| 309 | +启动发现,spring-cloud-config-server 服务无法找到,原因如下: |
| 310 | + |
| 311 | +``` |
| 312 | +注意:当前应用需要提前获取应用信息,那么将 Eureka 的配置信息提前至 bootstrap.properties 文件 |
| 313 | +原因:bootstrap 上下文是 Spring Boot 上下文的 父 上下文,那么它最先加载,因此需要最优先加载 Eureka 注册信息 |
| 314 | +``` |
| 315 | + |
| 316 | + |
| 317 | + |
| 318 | +##### 调整后配置 |
| 319 | + |
| 320 | +`bootstrap.properties`: |
| 321 | + |
| 322 | +```properties |
| 323 | +## 注意:当前应用需要提前获取应用信息,那么将 Eureka 的配置信息提前至 bootstrap.properties 文件 |
| 324 | +## 原因:bootstrap 上下文是 Spring Boot 上下文的 父 上下文,那么它最先加载,因此需要最优先加载 Eureka 注册信息 |
| 325 | +## Spring Cloud Eureka 客户端 注册到 Eureka 服务器 |
| 326 | +eureka.client.serviceUrl.defaultZone = http://localhost:9090/eureka |
| 327 | + |
| 328 | +## 配置客户端应用关联的应用 |
| 329 | +## spring.cloud.config.name 是可选的 |
| 330 | +## 如果没有配置,采用 ${spring.application.name} |
| 331 | +spring.cloud.config.name = segmentfault |
| 332 | +## 关联 profile |
| 333 | +spring.cloud.config.profile = prod |
| 334 | +## 关联 label |
| 335 | +spring.cloud.config.label = master |
| 336 | +## 激活 Config 服务器发现 |
| 337 | +spring.cloud.config.discovery.enabled = true |
| 338 | +## 配置 Config 服务器的应用名称(Service ID) |
| 339 | +spring.cloud.config.discovery.serviceId = spring-cloud-config-server |
| 340 | +``` |
| 341 | + |
| 342 | + |
| 343 | + |
| 344 | +##### 再次检验效果 |
| 345 | + |
| 346 | +访问 http://localhost:8080/env: |
| 347 | + |
| 348 | +```json |
| 349 | +"configService:https://github.com/mercyblitz/tmp/segmentfault-prod.properties": { |
| 350 | + "sf.user.id": "001", |
| 351 | + "sf.user.name": "xiaomage", |
| 352 | + "name": "segumentfault.com" |
| 353 | + }, |
| 354 | + "configService:https://github.com/mercyblitz/tmp/segmentfault.properties": { |
| 355 | + "name": "segumentfault.com" |
| 356 | + }, |
| 357 | +``` |
| 358 | + |
| 359 | +以上内容来自于`spring-cloud-config-server`: |
| 360 | + |
| 361 | +http://localhost:7070/segmentfault-prod.properties |
| 362 | + |
| 363 | +```properties |
| 364 | +name: segumentfault.com |
| 365 | +sf.user.id: 001 |
| 366 | +sf.user.name: xiaomage |
| 367 | +``` |
| 368 | + |
| 369 | + |
| 370 | + |
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