Could not connect to eureka server from docker - spring-boot

Question

I'm trying connection to eureka server from docker container.
The eureka server is running via "java -jar eureka-server.jar" command.
The eureka client is running on docker container.
Eureka server configuration is:
eureka:
instance:
hostname: eurekaserver
client:
registerWithEureka: true
fetchRegistry: true
serviceUrl:
defaultZone: http://eurekaserver:8080/eureka/
Eureka client configuration is:
spring:
application:
name: client-application
server:
port: 8081
eureka:
client:
serviceUrl:
defaultZone: http://eurekaserver:8080/eureka/
I also tried to setup directly ip-address for example
eureka:
client:
serviceUrl:
defaultZone: http://1.2.3.4:8080/eureka/
But, unfortunately, I'm facing with stack trace:
[2019-05-26 09:44:14.714] slf4j - 1 INFO [main] --- o.a.h.i.c.DefaultHttpClient: Retrying connect to {}-> http://eurekaserver:8080
[2019-05-26 09:44:15.717] slf4j - 1 ERROR [main] --- c.n.d.s.t.d.RedirectingEurekaHttpClient: Request execution error
com.sun.jersey.api.client.ClientHandlerException: java.net.NoRouteToHostException: No route to host (Host unreachable)
at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187)
at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123)
at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27)
at com.sun.jersey.api.client.Client.handle(Client.java:652)
at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682)
at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:509)
...
Caused by: java.net.NoRouteToHostException: No route to host (Host unreachable)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:120)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:179)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:134)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:612)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:447)
at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:884)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:117)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:173)
... 72 common frames omitted
And it is cause of
com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
So my question is how to resolve connectivity?
Docker and eureka are placed on the same machine, because the command curl "http://1.2.3.4:8080/eureka/apps" returns app to me
How can I do some investigating, why a docker cannot resolve the host?
p.s. I've known about issue, when eureka-client looks at localhost hostname, but looks like my issue another.
Thank you.

Answer 1

Resolved.
The cause of the issue was, don't use
registerWithEureka: true
fetchRegistry: true
More about, find at first links after typing properties name in google
But if you use them, then you have to set serviceUrl as hostname and also add
instance.preferUseIpAddress: true
p.s. Not sure that is fully can solve this problem, but that, I have changed at application config.