How to access a port exposed from a docker container?

$ docker container ls --format "table {{.ID}}t{{.Names}}t{{.Ports}}" -a
CONTAINER ID        NAMES               PORTS
ae87d83af7d3        hopeful_engelbart   
d13e260c4dec        unruffled_bouman    
db2c482de210        jenkinsci           0.0.0.0:8080->8080/tcp, 50000/tcp
cd201cbd413e        xyz                 0.0.0.0:5000->5000/tcp
c64c32ac68b8        pqr

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$ docker container ls --format "table {{.ID}}t{{.Names}}t{{.Ports}}" -aCONTAINER ID        NAMES               PORTSae87d83af7d3        hopeful_engelbart   d13e260c4dec        unruffled_bouman    db2c482de210        jenkinsci           0.0.0.0:8080->8080/tcp, 50000/tcpcd201cbd413e        xyz                 0.0.0.0:5000->5000/tcpc64c32ac68b8        pqr              ​

$ docker container ls -a
CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS                      PORTS                               NAMES
ae87d83af7d3        442c97a73937          "/bin/bash"              11 minutes ago      Exited (0) 9 minutes ago                                        hopeful_engelbart
d13e260c4dec        442c97a73937          "/bin/bash"              27 minutes ago      Exited (0) 24 minutes ago                                       unruffled_bouman
db2c482de210        jenkins/jenkins:lts   "/sbin/tini -- /usr/…"   3 days ago          Up 41 minutes               0.0.0.0:8080->8080/tcp, 50000/tcp   jenkinsci
cd201cbd413e        442c97a73937          "bash"                   3 days ago          Up 7 minutes                0.0.0.0:5000->5000/tcp        xyz
c64c32ac68b8        442c97a73937          "bash"                   3 days ago          Exited (0) 2 days ago                                           pqr

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$ docker container ls -aCONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS                      PORTS                               NAMESae87d83af7d3        442c97a73937          "/bin/bash"              11 minutes ago      Exited (0) 9 minutes ago                                        hopeful_engelbartd13e260c4dec        442c97a73937          "/bin/bash"              27 minutes ago      Exited (0) 24 minutes ago                                       unruffled_boumandb2c482de210        jenkins/jenkins:lts   "/sbin/tini -- /usr/…"   3 days ago          Up 41 minutes               0.0.0.0:8080->8080/tcp, 50000/tcp   jenkinscicd201cbd413e        442c97a73937          "bash"                   3 days ago          Up 7 minutes                0.0.0.0:5000->5000/tcp        xyzc64c32ac68b8        442c97a73937          "bash"                   3 days ago          Exited (0) 2 days ago                                           pqr​

Above outputs show that the port 5000 has been exposed (I hope).

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' xyz
172.17.0.3

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docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' xyz172.17.0.3​

Now when I do from the host machine:

wget -c 172.17.0.3:5000
--2019-12-30 16:26:44--  http://172.17.0.3:5000/
Connecting to 172.17.0.3:5000... failed: Connection refused.

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wget -c 172.17.0.3:5000--2019-12-30 16:26:44--  http://172.17.0.3:5000/Connecting to 172.17.0.3:5000... failed: Connection refused.​

What is the way to access that port since it is exposed and the container is running?

$ wget -c localhost:5000
--2019-12-30 16:41:57--  http://localhost:5000/
Resolving localhost (localhost)... 127.0.0.1
Connecting to localhost (localhost)|127.0.0.1|:5000... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

--2019-12-30 16:41:58--  (try: 2)  http://localhost:5000/
Connecting to localhost (localhost)|127.0.0.1|:5000... connected.
HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.
Retrying.

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$ wget -c localhost:5000--2019-12-30 16:41:57--  http://localhost:5000/Resolving localhost (localhost)... 127.0.0.1Connecting to localhost (localhost)|127.0.0.1|:5000... connected.HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.Retrying.​--2019-12-30 16:41:58--  (try: 2)  http://localhost:5000/Connecting to localhost (localhost)|127.0.0.1|:5000... connected.HTTP request sent, awaiting response... Read error (Connection reset by peer) in headers.Retrying.​

Answer

First of all, check if you have an application, listening to the port inside your container. Just try to connect to it from your container:

docker exec xyz wget 127.0.0.1:5000

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docker exec xyz wget 127.0.0.1:5000​

If it’ll work then you have a problem with port exposing, otherwise, there is no web server running inside your container.

And the error you get

Read error (Connection reset by peer) in headers.

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Read error (Connection reset by peer) in headers.​

seems to point to the problem in your web server rather then connectivity issues.

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Answer