六、Eureka集群配置

集群配置：

集群就是指将很多服务器集中起来一起进行同一种服务，在客户端看来就像是只有一个服务器。集群可以利用多个计算机进行[并行计算]从而获得很高的计算速度，也可以用多个计算机做[备份]，从而使得任何一个机器坏了整个系统还是能正常运行。

从我们的实验看来就是将Eureka的服务进行集中配置，一个坏了，把服务交给另外一个服务；

代码如下：

先配置Windows/system32/drivers/host里面的文件

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# Copyright (c) 1993-2009 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
#      102.54.94.97     rhino.acme.com          # source server
#       38.25.63.10     x.acme.com              # x client host

# localhost name resolution is handled within DNS itself.
#	127.0.0.1       localhost
#	::1             localhost
127.0.0.1       activate.navicat.com
203.208.50.161 dl.google.com
127.0.0.1       localhost7001.com
127.0.0.1       localhost7002.com
127.0.0.1       localhost7003.com

按照前面的7001的配置配置其他的7002和7003

配置如下：

7003

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server:
  port: 7003

eureka:
  instance:
    hostname: localhost7003.com
  client:
    register-with-eureka: false #是否向注册中心注册自己，由于自己就是注册中心，所以这个选项为false
    fetch-registry: false #s 是否是注册中心
    service-url:
      defaultZone: http://localhost7001.com:7001/eureka/,http://localhost7002.com:7002/eureka/

7002

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server:
  port: 7002

eureka:
  instance:
    hostname: localhost7002.com
  client:
    register-with-eureka: false #是否向注册中心注册自己，由于自己就是注册中心，所以这个选项为false
    fetch-registry: false #s 是否是注册中心
    service-url:
      defaultZone: http://localhost7003.com:7003/eureka/,http://localhost7001.com:7001/eureka/

7001

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server:
  port: 7001

eureka:
  instance:
    hostname: localhost7001.com
  client:
    register-with-eureka: false #是否向注册中心注册自己，由于自己就是注册中心，所以这个选项为false
    fetch-registry: false #s 是否是注册中心
    service-url:
      defaultZone: http://localhost7002.com:7002/eureka/,http://localhost7003.com:7003/eureka/

需要注意的是，defaultZone的写法，位置末尾不可以有逗号和空格的出现，不然的话就会失败；出现一系列的错误,一个集群一个服务需要再default里面写上其他的地址

然后打开提供者8001，访问其中一个服务出现下面的情况就成功了

image-20201024153705263