第二章：微服务与Spring Cloud Eureka 上篇

一、Eureka 简介

服务发现技术选型

二、Spring Cloud  Eureka 入门案例

1、在浏览器输入：http://localhost:8761/

2、在浏览器输入：http://localhost:8761/eureka/apps

<applications><versions__delta>1</versions__delta><apps__hashcode>UP_1_</apps__hashcode><application><name>DEMO-CLIENT1</name><instance><instanceId>LAH:demo-client1:8081</instanceId><hostName>LAH</hostName><app>DEMO-CLIENT1</app><ipAddr>192.168.118.30</ipAddr><status>UP</status><overriddenstatus>UNKNOWN</overriddenstatus><port enabled="true">8081</port><securePort enabled="false">443</securePort><countryId>1</countryId><dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo"><name>MyOwn</name></dataCenterInfo><leaseInfo><renewalIntervalInSecs>30</renewalIntervalInSecs><durationInSecs>90</durationInSecs><registrationTimestamp>1541662811411</registrationTimestamp><lastRenewalTimestamp>1541662961393</lastRenewalTimestamp><evictionTimestamp>0</evictionTimestamp><serviceUpTimestamp>1541660845280</serviceUpTimestamp></leaseInfo><metadata><management.port>8081</management.port><jmx.port>55850</jmx.port></metadata><homePageUrl>http://LAH:8081/</homePageUrl><statusPageUrl>http://LAH:8081/actuator/info</statusPageUrl><healthCheckUrl>http://LAH:8081/actuator/health</healthCheckUrl><vipAddress>demo-client1</vipAddress><secureVipAddress>demo-client1</secureVipAddress><isCoordinatingDiscoveryServer>false</isCoordinatingDiscoveryServer><lastUpdatedTimestamp>1541662811412</lastUpdatedTimestamp><lastDirtyTimestamp>1541662811343</lastDirtyTimestamp><actionType>ADDED</actionType></instance></application></applications>

三、 REST API实例

1、查询所有应用示例

1、命令

curl -i 192.168.118.30:8761/eureka/apps

2、输出

 1 HTTP/1.1 200
 2 Content-Type: application/xml
 3 Transfer-Encoding: chunked
 4 Date: Thu, 08 Nov 2018 08:40:36 GMT
 5 
 6 <applications>
 7   <versions__delta>1</versions__delta>
 8   <apps__hashcode>UP_1_</apps__hashcode>
 9   <application>
10     <name>DEMO-CLIENT1</name>
11     <instance>
12       <instanceId>LAH:demo-client1:8081</instanceId>
13       <hostName>LAH</hostName>
14       <app>DEMO-CLIENT1</app>
15       <ipAddr>192.168.118.30</ipAddr>
16       <status>UP</status>
17       <overriddenstatus>UNKNOWN</overriddenstatus>
18       <port enabled="true">8081</port>
19       <securePort enabled="false">443</securePort>
20       <countryId>1</countryId>
21       <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">
22         <name>MyOwn</name>
23       </dataCenterInfo>
24       <leaseInfo>
25         <renewalIntervalInSecs>30</renewalIntervalInSecs>
26         <durationInSecs>90</durationInSecs>
27         <registrationTimestamp>1541662811411</registrationTimestamp>
28         <lastRenewalTimestamp>1541666502900</lastRenewalTimestamp>
29         <evictionTimestamp>0</evictionTimestamp>
30         <serviceUpTimestamp>1541660845280</serviceUpTimestamp>
31       </leaseInfo>
32       <metadata>
33         <management.port>8081</management.port>
34         <jmx.port>55850</jmx.port>
35       </metadata>
36       <homePageUrl>http://LAH:8081/</homePageUrl>
37       <statusPageUrl>http://LAH:8081/actuator/info</statusPageUrl>
38       <healthCheckUrl>http://LAH:8081/actuator/health</healthCheckUrl>
39       <vipAddress>demo-client1</vipAddress>
40       <secureVipAddress>demo-client1</secureVipAddress>
41       <isCoordinatingDiscoveryServer>false</isCoordinatingDiscoveryServer>
42       <lastUpdatedTimestamp>1541662811412</lastUpdatedTimestamp>
43       <lastDirtyTimestamp>1541662811343</lastDirtyTimestamp>
44       <actionType>ADDED</actionType>
45     </instance>
46   </application>
查询所有应用示例

2、根据appid查询

1、命令

curl -i 192.168.118.30:8761/eureka/apps/DEMO-CLIENT1

2、输出结果

 1 HTTP/1.1 200
 2 Content-Type: application/xml
 3 Transfer-Encoding: chunked
 4 Date: Thu, 08 Nov 2018 09:00:54 GMT
 5 
 6 <application>
 7   <name>DEMO-CLIENT1</name>
 8   <instance>
 9     <instanceId>LAH:demo-client1:8081</instanceId>
10     <hostName>LAH</hostName>
11     <app>DEMO-CLIENT1</app>
12     <ipAddr>192.168.118.30</ipAddr>
13     <status>UP</status>
14     <overriddenstatus>UNKNOWN</overriddenstatus>
15     <port enabled="true">8081</port>
16     <securePort enabled="false">443</securePort>
17     <countryId>1</countryId>
18     <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">
19       <name>MyOwn</name>
20     </dataCenterInfo>
21     <leaseInfo>
22       <renewalIntervalInSecs>30</renewalIntervalInSecs>
23       <durationInSecs>90</durationInSecs>
24       <registrationTimestamp>1541662811411</registrationTimestamp>
25       <lastRenewalTimestamp>1541667733506</lastRenewalTimestamp>
26       <evictionTimestamp>0</evictionTimestamp>
27       <serviceUpTimestamp>1541660845280</serviceUpTimestamp>
28     </leaseInfo>
29     <metadata>
30       <management.port>8081</management.port>
31       <jmx.port>55850</jmx.port>
32     </metadata>
33     <homePageUrl>http://LAH:8081/</homePageUrl>
34     <statusPageUrl>http://LAH:8081/actuator/info</statusPageUrl>
35     <healthCheckUrl>http://LAH:8081/actuator/health</healthCheckUrl>
36     <vipAddress>demo-client1</vipAddress>
37     <secureVipAddress>demo-client1</secureVipAddress>
38     <isCoordinatingDiscoveryServer>false</isCoordinatingDiscoveryServer>
39     <lastUpdatedTimestamp>1541662811412</lastUpdatedTimestamp>
40     <lastDirtyTimestamp>1541662811343</lastDirtyTimestamp>
41     <actionType>ADDED</actionType>
42   </instance>
根据appid查询

3、查询不到的返回结果

[root@kakfa ~]# curl -i 192.168.118.30:8761/eureka/apps/DEMO-CLIENT2
HTTP/1.1 404
Content-Type: application/xml
Content-Length: 0
Date: Thu, 08 Nov 2018 09:02:31 GMT

3、根据appid及instanceld查询

[root@kakfa ~]# curl -i 192.168.118.30:8761/eureka/apps/DEMO-CLIENT2/notfound
HTTP/1.1 404
Content-Type: application/xml
Content-Length: 0
Date: Thu, 08 Nov 2018 09:05:30 GMT

4、根据instanceld查询

 

[root@ccb-manage ccb-backend-8080]# curl -i http://192.168.118.30:8761/eureka/apps/instances/192.168.0.142:8090
HTTP/1.1 401
WWW-Authenticate: Basic realm="Spring"
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Pragma: no-cache
Expires: 0
X-Frame-Options: DENY
Strict-Transport-Security: max-age=31536000 ; includeSubDomains
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Date: Thu, 08 Nov 2018 09:15:24 GMT

{"timestamp":1541668524776,"status":401,"error":"Unauthorized","message":"Full authentication is required to access this resource","path":"/eureka/apps/instances/192.168.0.134:8090"}
his resource","path":"/eureka/apps/instances/192.168.0.142:8080"}

查询不到返回的结果

[root@kakfa ~]# curl -i 192.168.118.30:8761/eureka/apps/instances/LAH:demo-client1:8081
HTTP/1.1 404
Content-Type: application/xml
Content-Length: 0
Date: Thu, 08 Nov 2018 09:07:40 GM

5、注册新的应用实例

 

 6、注销应用实例

curl -i -X  http://localhost:8761/eureka/apps/client2/client2:8080

 

 7、暂停下线应用实例

curl -i -X PUT  http://localhost:8761/eureka/apps/demo-client1/10.2.238.223:demo-client:8081/status\?value\=OUT_OF_SERVICE

　　

 

 找不到该实例

[f:\~]$ curl -i -X PUT  http://localhost:8761/eureka/apps/demo-client1/10.2.238.223:demo-client:8081/status\?value\=OUT_OF_SERVICE
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
HTTP/1.1 400
Transfer-Encoding: chunked
Date: Thu, 08 Nov 2018 09:52:22 GMT
Connection: close

 8、恢复应用实例

curl -i -X DELETE  http://localhost:8761/eureka/apps/demo-client1/10.2.238.223:demo-client:8081/status

9、应用实例发送心跳

curl -i -X PUT  http://localhost:8761/eureka/apps/demo-client1/10.2.238.223:demo-client:8081

10、修改应用实例元数据

curl -i -X PUT  http://localhost:8761/eureka/apps/demo-client1/10.2.238.223:demo-client:8081/metadata\?profile\=canary

设置metadata，其中keyprofile，value为canary　

posted @ 2018-11-08 18:06  活的潇洒80  阅读(656)  评论(0)  编辑  收藏  举报