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Unable to access app deployed on Dokku in a droplet

Posted January 29, 2021 237 views
DockerDokkuDeploymentDigitalOcean Droplets

I’ve deployed an app on Dokku using DigitalOcean’s droplet, but unfortunately I’m unable to access, I cannot make any requests to my app from outiside the dokku.

Here is the app’s server logs, the app server is running on port 5000(inside a docker container, I guess?)

2021-01-29T15:54:55.631984450Z app[web.1]: Puma starting in single mode...
2021-01-29T15:54:55.632155110Z app[web.1]: * Version 4.3.5 (ruby 2.7.0-p0), codename: Mysterious Traveller
2021-01-29T15:54:55.632257250Z app[web.1]: * Min threads: 5, max threads: 5
2021-01-29T15:54:55.632416330Z app[web.1]: * Environment: production
2021-01-29T15:54:59.477622282Z app[web.1]: D, [2021-01-29T15:54:59.477398 #10] DEBUG -- : BONSAI_URL not present, proceeding with Elasticsearch defaults.
2021-01-29T15:55:01.789462413Z app[web.1]: * Listening on tcp://0.0.0.0:5000
2021-01-29T15:55:01.790215291Z app[web.1]: Use Ctrl-C to stop

Here is my port mappings for the app

Proxy enabled:                 true
Proxy port map:                http:80:5000
Proxy type:                    nginx

Here is docker ps -a output

CONTAINER ID        IMAGE                         COMMAND                  CREATED             STATUS                      PORTS               NAMES
29a40b74890a        dokku/propertysafe:latest     "/start web"             23 minutes ago      Up 23 minutes                                   propertysafe.web.1
159102b6127b        2ab94a5f043a                  "/bin/bash -c 'mkdir…"   23 minutes ago      Exited (0) 23 minutes ago                       naughty_sammet
a2dc93fff2dd        dd5cbe9f96db                  "/bin/bash -c 'mkdir…"   23 minutes ago      Exited (0) 23 minutes ago                       interesting_margulis
5861efa15abf        cc49b1d8e228                  "/build"                 26 minutes ago      Exited (0) 24 minutes ago                       peaceful_napier
e25ce8a7c7e2        9c8964c4fb67                  "/bin/bash -c 'cat >…"   26 minutes ago      Exited (0) 26 minutes ago                       dreamy_morse
410dbbc9cc4c        b197a493cfba                  "/bin/bash -c 'mkdir…"   26 minutes ago      Exited (0) 26 minutes ago                       crazy_hodgkin
5555c7890af0        gliderlabs/herokuish:latest   "/bin/bash -c 'mkdir…"   26 minutes ago      Exited (0) 26 minutes ago                       eager_meitner
287b083012b6        postgres:11.6                 "docker-entrypoint.s…"   2 hours ago         Up 2 hours                  5432/tcp            dokku.postgres.app_db

and the ufw firewall has permitted http traffic.

Everytime I make a hit to the droplet IP I get the connection refused error.

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coderx
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coderx

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1 answer
bobbyiliev February 1, 2021

Hi there @coderx,

What is the error that you get when you try to visit the app in your browser? As far as I can see from the docker ps output, the service is not exposing any ports.

I could suggest running the following command to check if your service is listening on the correct port on your host:

  • sudo netstat -plant

Feel free to share the output here!
Regards,
Bobby

Reply Report
  • coderx February 1, 2021

    Yeah it has to do something with docker container not exposing it’s port. How can I make the docker container expose it’s port automatically on deployment?

    I ran that command sudo netstat -plant and it gave the following output

    Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      2810/nginx: master  
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      610/systemd-resolve 
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      846/sshd: /usr/sbin 
tcp        0    340 128.199.215.81:22       72.255.43.70:15979      ESTABLISHED 2821/sshd: root@pts 
tcp6       0      0 :::80                   :::*                    LISTEN      2810/nginx: master  
tcp6       0      0 :::22                   :::*                    LISTEN      846/sshd: /usr/sbin

    In the browser I get an Connection refused error.

    Reply Report
    • bobbyiliev February 2, 2021

      Hi there @coderx,

      As far as I can see you have Nginx running but you also have a Docker proxy setup for port 80. This could be causing the problem. Have you tried using only the Docker proxy instead of the Nginx service?

      Regards,
      Bobby

      Reply Report
      • coderx February 2, 2021

        no, I haven’t tried that because I don’t know how to do that. I havent’t set up the nginx service or dokku proxy explicitly. They both have been set up by default.
        It would be helpful if you could tell me how to disable nginx to see what happens.

        I followed this deployment tutorial which apparently succeeds in the video but is causing problem for me.

        To me the problem is with the container not exposing its port 5000
        Here’s the output of docker ps

        CONTAINER ID        IMAGE                       COMMAND                  CREATED             STATUS              PORTS               NAMES
b711e9b95929        dokku/propertysafe:latest   "/start web"             29 hours ago        Up 29 hours                             propertysafe.web.1
7fc243c0be20        postgres:11.6               "docker-entrypoint.s…"   29 hours ago        Up 29 hours         5432/tcp            dokku.postgres.propertysafe_production

        and when I run docker port b711e9b95929 5000, it spits out

        Error: No public port '5000/tcp' published for b711e9b95929
        Reply Report
      • coderx February 2, 2021

        I tried to disable nginx-vhosts plugin by running dokku plugin:disable nginx-vhosts and it threw error saying that Cannot disable a core plugin

        Reply Report
  • coderx February 1, 2021

    Here is the output of dokku report my-app-name output

    -----> uname: Linux dokku-ubuntu-s-1vcpu-2gb-sgp1-01 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
-----> memory: 
                     total        used        free      shared  buff/cache   available
       Mem:           1987         399         194          15        1394        1418
       Swap:             0           0           0
-----> docker version: 
       Client: Docker Engine - Community
        Version:           19.03.13
        API version:       1.40
        Go version:        go1.13.15
        Git commit:        4484c46d9d
        Built:             Wed Sep 16 17:02:52 2020
        OS/Arch:           linux/amd64
        Experimental:      false

       Server: Docker Engine - Community
        Engine:
         Version:          19.03.13
         API version:      1.40 (minimum version 1.12)
         Go version:       go1.13.15
         Git commit:       4484c46d9d
         Built:            Wed Sep 16 17:01:20 2020
         OS/Arch:          linux/amd64
         Experimental:     false
        containerd:
         Version:          1.3.7
         GitCommit:        8fba4e9a7d01810a393d5d25a3621dc101981175
        runc:
         Version:          1.0.0-rc10
         GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
        docker-init:
         Version:          0.18.0
         GitCommit:        fec3683
-----> docker daemon info: 
       Client:
        Debug Mode: true

       Server:
        Containers: 9
         Running: 2
         Paused: 0
         Stopped: 7
        Images: 13
        Server Version: 19.03.13
        Storage Driver: overlay2
         Backing Filesystem: extfs
         Supports d_type: true
         Native Overlay Diff: true
        Logging Driver: json-file
        Cgroup Driver: cgroupfs
        Plugins:
         Volume: local
         Network: bridge host ipvlan macvlan null overlay
         Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
        Swarm: inactive
        Runtimes: runc
        Default Runtime: runc
        Init Binary: docker-init
        containerd version: 8fba4e9a7d01810a393d5d25a3621dc101981175
        runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
        init version: fec3683
        Security Options:
         apparmor
         seccomp
          Profile: default
        Kernel Version: 5.4.0-52-generic
        Operating System: Ubuntu 20.04.1 LTS
        OSType: linux
        Architecture: x86_64
        CPUs: 1
        Total Memory: 1.941GiB
        Name: dokku-ubuntu-s-1vcpu-2gb-sgp1-01
        ID: PEEB:CHZO:EMP7:XJR5:2ZB7:QM5F:TPDW:PHRP:MO73:X7YR:V5PN:LJDA
        Docker Root Dir: /var/lib/docker
        Debug Mode: false
        Registry: https://index.docker.io/v1/
        Labels:
        Experimental: false
        Insecure Registries:
         127.0.0.0/8
        Live Restore Enabled: false

-----> sigil version: 0.6.0
-----> herokuish version: 
       herokuish: 0.5.18
       buildpacks:
         heroku-buildpack-multi     v1.0.0
         heroku-buildpack-ruby      v218
         heroku-buildpack-nodejs    v175
         heroku-buildpack-clojure   v85
         heroku-buildpack-python    v177
         heroku-buildpack-java      v66
         heroku-buildpack-gradle    v31
         heroku-buildpack-scala     v87
         heroku-buildpack-play      v26
         heroku-buildpack-php       v179
         heroku-buildpack-go        v145
         buildpack-nginx            v14
-----> dokku version: dokku version 0.21.4
-----> dokku plugins: 
       plugn: 0.5.0
         00_dokku-standard    0.21.4 enabled    dokku core standard plugin
         20_events            0.21.4 enabled    dokku core events logging plugin
         app-json             0.21.4 enabled    dokku core app-json plugin
         apps                 0.21.4 enabled    dokku core apps plugin
         builder-dockerfile   0.21.4 enabled    dokku core builder-dockerfile plugin
         builder-herokuish    0.21.4 enabled    dokku core builder-herokuish plugin
         buildpacks           0.21.4 enabled    dokku core buildpacks plugin
         certs                0.21.4 enabled    dokku core certificate management plugin
         checks               0.21.4 enabled    dokku core checks plugin
         common               0.21.4 enabled    dokku core common plugin
         config               0.21.4 enabled    dokku core config plugin
         docker-options       0.21.4 enabled    dokku core docker-options plugin
         domains              0.21.4 enabled    dokku core domains plugin
         enter                0.21.4 enabled    dokku core enter plugin
         git                  0.21.4 enabled    dokku core git plugin
         logs                 0.21.4 enabled    dokku core logs plugin
         network              0.21.4 enabled    dokku core network plugin
         nginx-vhosts         0.21.4 enabled    dokku core nginx-vhosts plugin
         plugin               0.21.4 enabled    dokku core plugin plugin
         postgres             1.11.6 enabled    dokku postgres service plugin
         proxy                0.21.4 enabled    dokku core proxy plugin
         ps                   0.21.4 enabled    dokku core ps plugin
         repo                 0.21.4 enabled    dokku core repo plugin
         resource             0.21.4 enabled    dokku core resource plugin
         scheduler-docker-local 0.21.4 enabled    dokku core scheduler-docker-local plugin
         shell                0.21.4 enabled    dokku core shell plugin
         ssh-keys             0.21.4 enabled    dokku core ssh-keys plugin
         storage              0.21.4 enabled    dokku core storage plugin
         tags                 0.21.4 enabled    dokku core tags plugin
         tar                  0.21.4 enabled    dokku core tar plugin
         trace                0.21.4 enabled    dokku core trace plugin
=====> propertysafe app information
       App deploy source:             
       App dir:                       /home/dokku/propertysafe
       App locked:                    false
=====> propertysafe buildpacks information
       Buildpacks list:               
=====> propertysafe ssl information
       Ssl dir:                       /home/dokku/propertysafe/tls
       Ssl enabled:                   false                    
       Ssl hostnames:                                          
       Ssl expires at:                                         
       Ssl issuer:                                             
       Ssl starts at:                                          
       Ssl subject:                                            
       Ssl verified:                                           
=====> propertysafe checks information
       Checks disabled list:          none                     
       Checks skipped list:           none                     
=====> propertysafe docker options information
       Docker options build:          --link dokku.postgres.propertysafe_production:dokku-postgres-propertysafe-production 
       Docker options deploy:         --link dokku.postgres.propertysafe_production:dokku-postgres-propertysafe-production --restart=on-failure:10 
       Docker options run:            --link dokku.postgres.propertysafe_production:dokku-postgres-propertysafe-production 
=====> propertysafe domains information
       Domains app enabled:           true                     
       Domains app vhosts:            propertysafe.dokkuwala   
       Domains global enabled:        true                     
       Domains global vhosts:         dokkuwala                
=====> propertysafe git information
       Git deploy branch:             master                   
       Git global deploy branch:      master                   
       Git keep git dir:              false                    
       Git rev env var:               GIT_REV                  
       Git sha:                       6ab0e28                  
       Git last updated at:                                    
=====> propertysafe network information
       Network attach post create:    
       Network attach post deploy:    
       Network bind all interfaces:   false
       Network web listeners:         172.17.0.3:5000
=====> propertysafe nginx information
       Nginx access log path:         /var/log/nginx/propertysafe-access.log
       Nginx bind address ipv4:                                
       Nginx bind address ipv6:       ::                       
       Nginx error log path:          /var/log/nginx/propertysafe-error.log
       Nginx hsts:                    true                     
       Nginx hsts include subdomains: true                     
       Nginx hsts max age:            15724800                 
       Nginx hsts preload:            false                    
       Nginx proxy read timeout:      60s                      
       Nginx last visited at:         1612192337               
=====> propertysafe proxy information
       Proxy enabled:                 true
       Proxy port map:                http:80:5000
       Proxy type:                    nginx
=====> propertysafe ps information
       Processes:                     1                        
       Deployed:                      true                     
       Running:                       true                     
       Restore:                       true                     
       Restart policy:                on-failure:10            
       Ps can scale:                  true                     
       Status web.1:                  running    (CID: b711e9b95929)
=====> propertysafe scheduler-docker-local information
       Scheduler docker local disable chown:                          
=====> propertysafe storage information
       Storage build mounts:                                   
       Storage deploy mounts:                                  
       Storage run mounts:
    Reply Report
  • coderx February 5, 2021

    Hi @bobbyiliev I’m not running those containers explicitly, they are created and run by dokku itself when I push code for deployment. So, I’m not aware of how and where I would need to specify the expose command, as I have no Dockerfile which get run on deployment(don’t know whether it is even possible or not).
    On the other hand, it is not possible to expose port of a container that is already running. Therefore, I will first have to stop the container and run it manually by myself, also manually stopping the container breaks things, moreover for running that container again; I can’t possibly know what args were passed to that container when Dokku ran it on deployment (like the docker volumes etc).

    Reply Report
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