Re: host not found when using http4 in docker container
OK, I think I worked out how to resolve this. It seems you need to have a `depends_on` property in the container that is posting the HTTP request. The service that is receiving the request need to be present in the `depends_on` otherwise Java cannot resolve the host names (even though the operating system can). e.g. in my case I needed to specify something like this: depends_on: coreservices: condition: service_healthy Clearly a Docker and Java thing, not really anything to do with Camel or the HTTP4 component. But very strange nonetheless! On 06/06/18 04:35, Willem Jiang wrote: Can you add a link to the camel container just like this ? camel: image: "camel:0.3.0-SNAPSHOT" hostname: camel links: - "otherHost" - "zipkin:zipkin.io" Willem Jiang Twitter: willemjiang Weibo: 姜宁willem On Wed, Jun 6, 2018 at 4:40 AM, Tim Dudgeon wrote: On 05/06/18 20:40, Robin Vanderhallen wrote: Are both containers in the same network in the docker compose file? Yes. Both are in the same network environment, but this is not the default network. networks: - xxx Tim
Re: host not found when using http4 in docker container
I don't see how that would help (and the links attribute is a legacy feature and not recommended). My situation is that the two containers are on the same network and can see each other. e.g. you can open a shell in one and ping the other using its hostname. So the networking at the container level is perfectly OK. The problem is that when using the HTTP4 camel component the same hostname does not get resolved. It looks like this is being done by the org.apache.http.impl.conn.SystemDefaultDnsResolver class in httpcomponents [1] which states in its docs: "DNS resolver that uses the default OS implementation for resolving host names." But it seems like it doesn't do this correctly? [1] https://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/impl/conn/SystemDefaultDnsResolver.html On 06/06/18 04:35, Willem Jiang wrote: Can you add a link to the camel container just like this ? camel: image: "camel:0.3.0-SNAPSHOT" hostname: camel links: - "otherHost" - "zipkin:zipkin.io" Willem Jiang Twitter: willemjiang Weibo: 姜宁willem On Wed, Jun 6, 2018 at 4:40 AM, Tim Dudgeon wrote: On 05/06/18 20:40, Robin Vanderhallen wrote: Are both containers in the same network in the docker compose file? Yes. Both are in the same network environment, but this is not the default network. networks: - xxx Tim
Re: host not found when using http4 in docker container
Can you add a link to the camel container just like this ? camel: image: "camel:0.3.0-SNAPSHOT" hostname: camel links: - "otherHost" - "zipkin:zipkin.io" Willem Jiang Twitter: willemjiang Weibo: 姜宁willem On Wed, Jun 6, 2018 at 4:40 AM, Tim Dudgeon wrote: > On 05/06/18 20:40, Robin Vanderhallen wrote: > >> Are both containers in the same network in the docker compose file? >> > Yes. Both are in the same network environment, but this is not the default > network. > > networks: > - xxx > > Tim >
Re: host not found when using http4 in docker container
On 05/06/18 20:40, Robin Vanderhallen wrote: Are both containers in the same network in the docker compose file? Yes. Both are in the same network environment, but this is not the default network. networks: - xxx Tim
Re: host not found when using http4 in docker container
Are both containers in the same network in the docker compose file? On 5 Jun 2018, 19:29 +0200, Tim Dudgeon , wrote: > I'm running camel inside a Docker container and trying to use the HTTP4 > component to post a request to a service running in a different > container (both containers are managed through Docker compose). > Essentially I'm trying to do a post to a route like this: > http4:coreservices:8080/coreservices/rest/v1/services > where coreservices is the name of the other container. > > This fails with a java.net.UnknownHostException (see below). > But the other container is definitely accessible from this container as > if I open a shell in it I can the curl the 'coreservices' host. > > Any idea what's going wrong here? > > Thanks > Tim > > > 05-Jun-2018 17:09:34.667 SEVERE [localhost-startStop-1] > org.apache.camel.util.CamelLogger.log Failed delivery for (MessageId: > ID-4b81ce1e6383-46459-1528218572076-1-3 on ExchangeId: > ID-4b81ce1e6383-46459-1528218572076-1-2). Exhausted after delivery > attempt: 1 caught: java.net.UnknownHostException: coreservices: Name or > service not known > > Message History > --- > RouteId ProcessorId Processor Elapsed (ms) > [route6 ] [route6 ] > [direct://post-service-descriptors ] [ 283] > [route6 ] [log1 ] [log ] [ 5] > [route6 ] [process1 ] [Processor@0xa8e9d5 ] [ 173] > [route6 ] [to1 ] > [http4:coreservices:8080/coreservices/rest/v1/services ] [ 95] > > Stacktrace > --- > java.net.UnknownHostException: coreservices: Name or service not known > at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method) > at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928) > at > java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323) > at java.net.InetAddress.getAllByName0(InetAddress.java:1276) > at java.net.InetAddress.getAllByName(InetAddress.java:1192) > at java.net.InetAddress.getAllByName(InetAddress.java:1126) > at > org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45) > at > org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:111) > at > org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353) > at > org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380) > at > org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236) > at > org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184) > at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) > at > org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) > at > org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184) > at > org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) > at > org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55) > at > org.apache.camel.component.http4.HttpProducer.executeMethod(HttpProducer.java:306) > at > org.apache.camel.component.http4.HttpProducer.process(HttpProducer.java:178) > at > org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61) > at > org.apache.camel.processor.SendProcessor.process(SendProcessor.java:145) > at > org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77) > at > org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:542) > at > org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197) > at org.apache.camel.processor.Pipeline.process(Pipeline.java:120) > at org.apache.camel.processor.Pipeline.process(Pipeline.java:83) > at > org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197) > at > org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:62) > at > org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197) > at > org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:97) > at > org.apache.camel.impl.ProducerCache$1.doInProducer(ProducerCache.java:529) > at > org.apache.camel.impl.ProducerCache$1.doInProducer(ProducerCache.java:497) > at > org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:365) > at >
