REST request from one docker container to another fails -

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i have 2 applications, 1 of has restful interface used other. both running on same machine.

application runs in docker container. running using command line:

docker run -p 40000:8080 --name appa image1

when test application b outside docker container (in other words, before dockerized) application b executes restful requests , receives responses without problems.

unfortunately, when dockerize , run application b within container:

docker run -p 8081:8081 --name appb image2

whenever attempt send restful request application a, following:

connect localhost:40000 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: connection refused

of course, tried making application b connect using machine's ip address. when that, following failure:

connect 192.168.1.101:40000 failed: no route host

has seen kind of behavior before? causes application communicates dockerized application outside docker container fail communicate same dockerized application once dockerized???

someone please advise...

simply linking b docker run -p 8081:8081 --link appa --name appb image2, can access rest service using appa:8080.

the reason docker containers run on own subnet (normally 172.17.0.0-255) , cannot access network host on. localhost container itself, not host.


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