In previous posts we’ve used Steeltoe to interact with Eureka. Obviously Steeltoe gives us good patterns for interacting with Eureka but also has the capability to work with other service discovery registries etc.<\/p>\n
Steeltoe’s great, but what if we wanted to just write our own Eureka either for learning how things work or maybe we just want to write our own for .NET or for another language\/technology?<\/p>\n
Eureka exposes REST operations for everything you’ll need to do with a service registry, let’s take a look.<\/p>\n
Note: I’ll give examples using localhost, obviously change to your Eureka host\/ip and I’ll also show data based upon the weatherapi we’ve worked on previously.<\/em><\/p>\n Query for all applications and their instances<\/strong><\/p>\n Query for instances for a specific application id<\/strong><\/p>\n Query for instances by its instance id<\/strong><\/p>\n Register an application instance<\/strong><\/p>\n As you will see from the status<\/em> we’ve set this service to STARTING and hence we need set the status<\/em> to UP when our service is running. Eureka, ofcourse, is just a registry and hence you service need to updated information as required.<\/p>\n Delete an instance<\/strong><\/p>\n Send an application instance heartbeat<\/strong><\/p>\n Take an instance out of service<\/strong><\/p>\n Now in the Eureka dashboard you’ll see the large, red OUT_OF_SERVICE text.<\/p>\n Remove the out of service state<\/strong><\/p>\n The status UP is optional, it’s a suggestion for the status after the removal of the OUT OF SERVICE override.<\/p>\n Update meta data<\/strong><\/p>\n Query for all instance of a vip address<\/strong><\/p>\n Query for all instance of a secure vip address<\/strong><\/p>\n In previous posts we’ve used Steeltoe to interact with Eureka. Obviously Steeltoe gives us good patterns for interacting with Eureka but also has the capability to work with other service discovery registries etc. Steeltoe’s great, but what if we wanted to just write our own Eureka either for learning how things work or maybe we […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[240],"tags":[],"class_list":["post-8677","post","type-post","status-publish","format-standard","hentry","category-eureka"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/8677","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/comments?post=8677"}],"version-history":[{"count":5,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/8677\/revisions"}],"predecessor-version":[{"id":8683,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/8677\/revisions\/8683"}],"wp:attachment":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/media?parent=8677"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/categories?post=8677"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/tags?post=8677"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
\r\nhttp:\/\/localhost:8761\/eureka\/apps\r\n<\/pre>\n<\/li>\n
\r\n<applications>\r\n <versions__delta>1<\/versions__delta>\r\n <apps__hashcode>UP_1_<\/apps__hashcode>\r\n <application>\r\n <name>WEATHERAPI<\/name>\r\n <instance>\r\n <instanceId>localhost:weatherapi:5001<\/instanceId>\r\n <hostName>localhost<\/hostName>\r\n <app>WEATHERAPI<\/app>\r\n <ipAddr>localhost<\/ipAddr>\r\n <status>UP<\/status>\r\n <overriddenstatus>UNKNOWN<\/overriddenstatus>\r\n <port enabled="false">8080<\/port>\r\n <securePort enabled="true">5001<\/securePort>\r\n <countryId>1<\/countryId>\r\n <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">\r\n <name>MyOwn<\/name>\r\n <\/dataCenterInfo>\r\n <leaseInfo>\r\n <renewalIntervalInSecs>30<\/renewalIntervalInSecs>\r\n <durationInSecs>90<\/durationInSecs>\r\n <registrationTimestamp>1611512017058<\/registrationTimestamp>\r\n <lastRenewalTimestamp>1611515916921<\/lastRenewalTimestamp>\r\n <evictionTimestamp>0<\/evictionTimestamp>\r\n <serviceUpTimestamp>1611512016403<\/serviceUpTimestamp>\r\n <\/leaseInfo>\r\n <metadata class="java.util.Collections$EmptyMap"\/>\r\n <homePageUrl>https:\/\/localhost:5001\/<\/homePageUrl>\r\n <statusPageUrl>https:\/\/localhost:5001\/actuator\/info<\/statusPageUrl>\r\n <healthCheckUrl>https:\/\/localhost:5001\/actuator\/health<\/healthCheckUrl>\r\n <vipAddress>weatherapi<\/vipAddress>\r\n <secureVipAddress>weatherapi<\/secureVipAddress>\r\n <isCoordinatingDiscoveryServer>false<\/isCoordinatingDiscoveryServer>\r\n <lastUpdatedTimestamp>1611512017058<\/lastUpdatedTimestamp>\r\n <lastDirtyTimestamp>1611512016217<\/lastDirtyTimestamp>\r\n <actionType>ADDED<\/actionType>\r\n <\/instance>\r\n <\/application>\r\n<\/applications>\r\n<\/pre>\n<\/li>\n<\/ul>\n
\n
\r\nhttp:\/\/localhost:8761\/eureka\/apps\/{your app id}\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/apps\/weatherapi\r\n<\/pre>\n<\/li>\n\r\n<application>\r\n <name>WEATHERAPI<\/name>\r\n <instance>\r\n <instanceId>localhost:weatherapi:5001<\/instanceId>\r\n <hostName>localhost<\/hostName>\r\n <app>WEATHERAPI<\/app>\r\n <ipAddr>localhost<\/ipAddr>\r\n <status>UP<\/status>\r\n <overriddenstatus>UNKNOWN<\/overriddenstatus>\r\n <port enabled="false">8080<\/port>\r\n <securePort enabled="true">5001<\/securePort>\r\n <countryId>1<\/countryId>\r\n <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">\r\n <name>MyOwn<\/name>\r\n <\/dataCenterInfo>\r\n <leaseInfo>\r\n <renewalIntervalInSecs>30<\/renewalIntervalInSecs>\r\n <durationInSecs>90<\/durationInSecs>\r\n <registrationTimestamp>1611512017058<\/registrationTimestamp>\r\n <lastRenewalTimestamp>1611516936969<\/lastRenewalTimestamp>\r\n <evictionTimestamp>0<\/evictionTimestamp>\r\n <serviceUpTimestamp>1611512016403<\/serviceUpTimestamp>\r\n <\/leaseInfo>\r\n <metadata class="java.util.Collections$EmptyMap"\/>\r\n <homePageUrl>https:\/\/localhost:5001\/<\/homePageUrl>\r\n <statusPageUrl>https:\/\/localhost:5001\/actuator\/info<\/statusPageUrl>\r\n <healthCheckUrl>https:\/\/localhost:5001\/actuator\/health<\/healthCheckUrl>\r\n <vipAddress>weatherapi<\/vipAddress>\r\n <secureVipAddress>weatherapi<\/secureVipAddress>\r\n <isCoordinatingDiscoveryServer>false<\/isCoordinatingDiscoveryServer>\r\n <lastUpdatedTimestamp>1611512017058<\/lastUpdatedTimestamp>\r\n <lastDirtyTimestamp>1611512016217<\/lastDirtyTimestamp>\r\n <actionType>ADDED<\/actionType>\r\n <\/instance>\r\n<\/application>\r\n<\/pre>\n<\/li>\n<\/ul>\n
\n
\r\nhttp:\/\/localhost:8761\/eureka\/apps\/{your app id}\/{your instance id}\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/apps\/weatherapi\/localhost:weatherapi:5001\r\n<\/pre>\n<\/li>\n\r\n<instance>\r\n <instanceId>localhost:weatherapi:5001<\/instanceId>\r\n <hostName>localhost<\/hostName>\r\n <app>WEATHERAPI<\/app>\r\n <ipAddr>localhost<\/ipAddr>\r\n <status>UP<\/status>\r\n <overriddenstatus>UNKNOWN<\/overriddenstatus>\r\n <port enabled="false">8080<\/port>\r\n <securePort enabled="true">5001<\/securePort>\r\n <countryId>1<\/countryId>\r\n <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">\r\n <name>MyOwn<\/name>\r\n <\/dataCenterInfo>\r\n <leaseInfo>\r\n <renewalIntervalInSecs>30<\/renewalIntervalInSecs>\r\n <durationInSecs>90<\/durationInSecs>\r\n <registrationTimestamp>1611512017058<\/registrationTimestamp>\r\n <lastRenewalTimestamp>1611517116997<\/lastRenewalTimestamp>\r\n <evictionTimestamp>0<\/evictionTimestamp>\r\n <serviceUpTimestamp>1611512016403<\/serviceUpTimestamp>\r\n <\/leaseInfo>\r\n <metadata class="java.util.Collections$EmptyMap"\/>\r\n <homePageUrl>https:\/\/localhost:5001\/<\/homePageUrl>\r\n <statusPageUrl>https:\/\/localhost:5001\/actuator\/info<\/statusPageUrl>\r\n <healthCheckUrl>https:\/\/localhost:5001\/actuator\/health<\/healthCheckUrl>\r\n <vipAddress>weatherapi<\/vipAddress>\r\n <secureVipAddress>weatherapi<\/secureVipAddress>\r\n <isCoordinatingDiscoveryServer>false<\/isCoordinatingDiscoveryServer>\r\n <lastUpdatedTimestamp>1611512017058<\/lastUpdatedTimestamp>\r\n <lastDirtyTimestamp>1611512016217<\/lastDirtyTimestamp>\r\n <actionType>ADDED<\/actionType>\r\n<\/instance>\r\n<\/pre>\n<\/li>\n<\/ul>\n
\n
\nHeaders: “Content-Type”: “application\/json”, “Accept”: “application\/json”<\/p>\n\r\nhttp:\/\/localhost:8761\/eureka\/apps\/{your app id}\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/apps\/myapp\r\n<\/pre>\n<\/li>\n\r\n{\r\n "instance": {\r\n "hostName": "myhost",\r\n "app": "myapp",\r\n "vipAddress": "myservice",\r\n "secureVipAddress": "myservice",\r\n "ipAddr": "10.0.0.10",\r\n "status": "STARTING",\r\n "port": {"$": "8080", "@enabled": "true"},\r\n "securePort": {"$": "8443", "@enabled": "true"},\r\n "healthCheckUrl": "http:\/\/myservice:8080\/healthcheck",\r\n "statusPageUrl": "http:\/\/myservice:8080\/status",\r\n "homePageUrl": "http:\/\/myservice:8080",\r\n "dataCenterInfo": {\r\n "@class": "com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo", \r\n "name": "MyOwn"\r\n }\r\n }\r\n}\r\n<\/pre>\n<\/li>\n\n
\r\nhttp:\/\/localhost:8761\/eureka\/apps\/{your app id}\/{your instance id}\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/apps\/myapp\/myhost\r\n<\/pre>\n<\/li>\n\n
\r\nhttp:\/\/localhost:8761\/eureka\/apps\/{your app id}\/{your instance id}\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/apps\/myapp\/myhost\r\n<\/pre>\n<\/li>\n\n
\r\nhttp:\/\/localhost:8761\/eureka\/apps\/{your app id}\/{your instance id}\/status?value=OUT_OF_SERVICE\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/apps\/myapp\/myhost\/status?value=OUT_OF_SERVICE\r\n<\/pre>\n<\/li>\n\n
\r\nhttp:\/\/localhost:8761\/eureka\/apps\/{your app id}\/{your instance id}\/status?value=UP\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/apps\/myapp\/myhost\/status?value=UP\r\n<\/pre>\n<\/li>\n\n
\r\nhttp:\/\/localhost:8761\/eureka\/apps\/{your app id}\/{your instance id}\/metadata?key=val\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/apps\/myapp\/myhost\/metadata?Version=2\r\n<\/pre>\n<\/li>\n\n
\r\nhttp:\/\/localhost:8761\/eureka\/vips\/{your vipAddress}\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/vips\/myservice\r\n<\/pre>\n<\/li>\n\r\n<applications>\r\n <versions__delta>-1<\/versions__delta>\r\n <apps__hashcode>UP_1_<\/apps__hashcode>\r\n <application>\r\n <name>MYAPP<\/name>\r\n <instance>\r\n <hostName>myhost<\/hostName>\r\n <app>MYAPP<\/app>\r\n <ipAddr>10.0.0.10<\/ipAddr>\r\n <status>UP<\/status>\r\n <overriddenstatus>UNKNOWN<\/overriddenstatus>\r\n <port enabled="true">8080<\/port>\r\n <securePort enabled="true">8443<\/securePort>\r\n <countryId>1<\/countryId>\r\n <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">\r\n <name>MyOwn<\/name>\r\n <\/dataCenterInfo>\r\n <leaseInfo>\r\n <renewalIntervalInSecs>30<\/renewalIntervalInSecs>\r\n <durationInSecs>90<\/durationInSecs>\r\n <registrationTimestamp>1611519061947<\/registrationTimestamp>\r\n <lastRenewalTimestamp>1611519061947<\/lastRenewalTimestamp>\r\n <evictionTimestamp>0<\/evictionTimestamp>\r\n <serviceUpTimestamp>1611518524498<\/serviceUpTimestamp>\r\n <\/leaseInfo>\r\n <metadata>\r\n <Version>2<\/Version>\r\n <\/metadata>\r\n <homePageUrl>http:\/\/myservice:8080<\/homePageUrl>\r\n <statusPageUrl>http:\/\/myservice:8080\/status<\/statusPageUrl>\r\n <healthCheckUrl>http:\/\/myservice:8080\/healthcheck<\/healthCheckUrl>\r\n <vipAddress>myservice<\/vipAddress>\r\n <secureVipAddress>myservice<\/secureVipAddress>\r\n <isCoordinatingDiscoveryServer>false<\/isCoordinatingDiscoveryServer>\r\n <lastUpdatedTimestamp>1611519061947<\/lastUpdatedTimestamp>\r\n <lastDirtyTimestamp>1611518524498<\/lastDirtyTimestamp>\r\n <actionType>ADDED<\/actionType>\r\n <\/instance>\r\n <\/application>\r\n<\/applications>\r\n<\/pre>\n<\/ul>\n
\n
\r\nhttp:\/\/localhost:8761\/eureka\/svips\/{your svipAddress}\r\n\r\n\/\/ Example\r\nhttp:\/\/localhost:8761\/eureka\/svips\/myservice\r\n<\/pre>\n<\/li>\n\r\n<applications>\r\n <versions__delta>-1<\/versions__delta>\r\n <apps__hashcode>UP_1_<\/apps__hashcode>\r\n <application>\r\n <name>MYAPP<\/name>\r\n <instance>\r\n <hostName>myhost<\/hostName>\r\n <app>MYAPP<\/app>\r\n <ipAddr>10.0.0.10<\/ipAddr>\r\n <status>UP<\/status>\r\n <overriddenstatus>UNKNOWN<\/overriddenstatus>\r\n <port enabled="true">8080<\/port>\r\n <securePort enabled="true">8443<\/securePort>\r\n <countryId>1<\/countryId>\r\n <dataCenterInfo class="com.netflix.appinfo.InstanceInfo$DefaultDataCenterInfo">\r\n <name>MyOwn<\/name>\r\n <\/dataCenterInfo>\r\n <leaseInfo>\r\n <renewalIntervalInSecs>30<\/renewalIntervalInSecs>\r\n <durationInSecs>90<\/durationInSecs>\r\n <registrationTimestamp>1611519061947<\/registrationTimestamp>\r\n <lastRenewalTimestamp>1611519061947<\/lastRenewalTimestamp>\r\n <evictionTimestamp>0<\/evictionTimestamp>\r\n <serviceUpTimestamp>1611518524498<\/serviceUpTimestamp>\r\n <\/leaseInfo>\r\n <metadata>\r\n <Version>2<\/Version>\r\n <\/metadata>\r\n <homePageUrl>http:\/\/myservice:8080<\/homePageUrl>\r\n <statusPageUrl>http:\/\/myservice:8080\/status<\/statusPageUrl>\r\n <healthCheckUrl>http:\/\/myservice:8080\/healthcheck<\/healthCheckUrl>\r\n <vipAddress>myservice<\/vipAddress>\r\n <secureVipAddress>myservice<\/secureVipAddress>\r\n <isCoordinatingDiscoveryServer>false<\/isCoordinatingDiscoveryServer>\r\n <lastUpdatedTimestamp>1611519061947<\/lastUpdatedTimestamp>\r\n <lastDirtyTimestamp>1611518524498<\/lastDirtyTimestamp>\r\n <actionType>ADDED<\/actionType>\r\n <\/instance>\r\n <\/application>\r\n<\/applications>\r\n<\/pre>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"