On Docker can't connect to localhost or remote

[adthonb]

I using this script on Docker but it can't connect to the localhost network. I can telnet to RabbitMQ on localhost. I can run on K8S that connect to Service.

This my console output

$ telnet localhost 5672

Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
123456
AMQP    Connection closed by foreign host.

$ docker run -it --rm pivotalrabbitmq/perf-test:latest --uri amqp://user:pass@localhost

Main thread caught exception: java.net.ConnectException: Connection refused (Connection refused)
22:11:52.689 [main] ERROR com.rabbitmq.perf.PerfTest - Main thread caught exception
java.net.ConnectException: Connection refused (Connection refused)
        at java.base/java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399)
        at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242)
        at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224)
        at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.base/java.net.Socket.connect(Socket.java:609)
        at com.rabbitmq.client.impl.SocketFrameHandlerFactory.create(SocketFrameHandlerFactory.java:60)
        at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:62)
        at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:156)
        at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1130)
        at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1087)
        at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:985)
        at com.rabbitmq.perf.MulticastSet$ConnectionCreator.createConfigurationConnections(MulticastSet.java:774)
        at com.rabbitmq.perf.MulticastSet.createConfigurationConnections(MulticastSet.java:284)
        at com.rabbitmq.perf.MulticastSet.run(MulticastSet.java:162)
        at com.rabbitmq.perf.PerfTest.main(PerfTest.java:353)
        at com.rabbitmq.perf.PerfTest.main(PerfTest.java:473)

[michaelklishin]

I will convert this issue to a GitHub discussion. Currently GitHub will automatically close and lock the issue even though your question will be transferred and responded to elsewhere. This is to let you know that we do not intend to ignore this but this is how the current GitHub conversion mechanism makes it seem for the users :(

[michaelklishin]

This is a Docker networking question that has nothing to do with PerfTest or RabbitMQ. You can use port mapping or even make the name of the host resolve in the container.

RabbitMQ will log all connection attempts that send at least one byte of data.

Default user with known credentials will only be able to connect from localhost, so you have to create a separate user and grant it access to the target virtual host.

Troubleshooting Networking provides a methodology for narrowing down connectivity issue (nothing specific to Docker).

[michaelklishin]

Also note that localhost in the container won't refer to your host. It will refer to the container's loopback interface. Port forwarding from the container to the host means you will have to use a custom target port in --uri. Making host name resolve in the container means you will be able to omit the port but will have to change the hostname in --uri.

[adthonb]

You're right. I think that I miss something. I add --network=host option to Docker command and it works.
Ref: https://docs.docker.com/network/host/