telnet: Unable to connect to remote host: Connection refused when trying to connect running docker image

问题

I am having ubuntu 18.04 running on a server. I am got a JasperServer image running on docker in it. I am trying to access it from my system. But it throws the following error:

jamshaid@jamshaid:~$ telnet my_server_address 9095
Trying my_server_ip...

telnet: Unable to connect to remote host: Connection refused

Here is the output for sudo docker ps -a

CONTAINER ID        IMAGE                   COMMAND                  CREATED             STATUS              PORTS                                           NAMES
69c31ba800ab        bitnami/jasperreports   "/app-entrypoint.sh …"   5 hours ago         Up 5 hours          0.0.0.0:9095->8080/tcp, 0.0.0.0:443->8443/tcp   ceyedev_jasperreports_1
2a7cb72da0c7        bitnami/mariadb:10.3    "/opt/bitnami/script…"   5 hours ago         Up 5 hours          0.0.0.0:3306->3306/tcp                          ceyedev_mariadb_1

if I telnet on localhost, it connects and then connection closes which means it is running well. Here is the output when I telnet it from localhost:

ceyedev@ub18servertiny:~$ telnet localhost 9095
Trying ::1...
Connected to localhost.localdomain.
Escape character is '^]'.
Connection closed by foreign host.

Here is the docker-compose file

version: '2'
services:
  mariadb:
    restart: always
    image: 'bitnami/mariadb:10.3'
    environment:
      - MARIADB_USER=bn_jasperreports
      - MARIADB_DATABASE=bitnami_jasperreports
      - ALLOW_EMPTY_PASSWORD=yes
    ports:
      - 3306:3306      
    volumes:
      - 'mariadb_data:/bitnami'
  jasperreports:
    restart: always
    image: 'bitnami/jasperreports'
    environment:
      - MARIADB_HOST=mariadb
      - MARIADB_PORT_NUMBER=3306
      - JASPERREPORTS_DATABASE_USER=bn_jasperreports
      - JASPERREPORTS_DATABASE_NAME=bitnami_jasperreports
      - ALLOW_EMPTY_PASSWORD=yes
    ports:
      - '9095:8080'
      - '443:8443'
    volumes:
      - 'jasperreports_data:/bitnami'
    depends_on:
      - mariadb
volumes:
  mariadb_data:
    driver: local
  jasperreports_data:
    driver: local

Here is the output for sudo docker logs container_id_for_jasper

I can telnet other ports from my local machine but having an issue with this one. Any ideas? thanks

keeping in the view of bullet 2 from answers, I executed the below command and found that 9095 is allocated by the server. Any ideas, please?

ceyedev@ub18servertiny:~$ netstat -atn
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN     
tcp        0    244 10.0.114.15:22          182.185.223.147:54326   ESTABLISHED
tcp6       0      0 :::22                   :::*                    LISTEN     
tcp6       0      0 ::1:5432                :::*                    LISTEN     
tcp6       0      0 :::443                  :::*                    LISTEN     
tcp6       0      0 :::9095                 :::*                    LISTEN     
tcp6       0      0 :::3306                 :::*                    LISTEN

回答1:

Based on your question, you know:

Docker container is running
Docker container is listening to port 9095
telnet from Linux server to docker container is working
telnet from other client somewhere in Internet to docker container is NOT working

I guess your Ubuntu server is not accepting incoming requests from Internet on port 9095. There can be many reasons for that:

Your server has firewall settings, which block connection
Your server did not publish port 9095 to Internet
Your client has no Internet access, when using port 9095

So I would investigate these aspects.
The docker part seems to be ok, because telnet to localhost is working.

回答2:

To people who got there and didn't find solution:

Make sure your web server is listening on 0.0.0.0 to listen ALL interfaces, including docker bridge to outer network

来源：https://stackoverflow.com/questions/64388362/telnet-unable-to-connect-to-remote-host-connection-refused-when-trying-to-conn

标签

Docker

ubuntu-18.04