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Troubleshooting "This site can't be reached"

Posted October 31, 2019 6k views
DigitalOceanDockerApplications

I’ve been successfully using the Metabase droplet for quite a while.
Few days ago, I tried opening the link I normally use and I get an error (tried every browser).
The droplet itself is active, I tried rebooting it a few time, but nothing.
I was wondering if anyone could help on the necessary steps to troubleshoot the problem.
Thanks a lot.

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caioac87
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caioac87

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5 answers
alexdo March 27, 2020

Hello, @caioac87 @dwihdyn789

If you can’t see java running when you use netstat than it means that Metabase is not running on your droplet.

You can confirm this by executing the following command:

service metabase status

If the service is not started you can start/restart it:

sudo service metabase start

Note: This might take up some time to run and actually start the service, if you still can’t access the Metabase in your browser try to manually start it using the commands bellow

The script that start the service is:

/opt/metabase/metabase.sh

You can execute this and wait for couple of minutes to complete.

You also need to start Java by executing the following command:

java -jar /opt/metabase/metabase.jar

If this is a new droplet I will recommend you to quickly spin up a new Metabase droplet as this will take less than 10 minutes to have it up and running.

Hope this helps!

Regards,
Alex

Reply Report
  • dwihdyn789 March 27, 2020

    @alexdo it works! Thank you and appreciate your swift responds :)

    Do you have any idea how does this even happen ya ? because i’ve been using metabase for 2 months non-stop, and its all work well. only then at one day, it decided to shut down by itself

    Would be grateful if you could share your thought, so me and the other developers who encounter this same issue can go back to this question and able to fix the issue ourselves!

    Reply Report
    • alexdo March 27, 2020

      Hello, @dwihdyn789

      I’m glad this is working for you! :)

      What I did in order to replicate the issue was to spin up a test Metabase droplet and then simply stopped the Metabase service with this command:

      sudo service metabase stop

      Once this was done, Java was not listening on the port 3000 and then I’ve executed the commands I’ve already provided. My guess here will be that something stopped/killed the java process that is running on port 3000 and caused the issue for you. The other explanation is that the Metabase service died unexpectedly. What you can do in order to check what happened is to examine the logs to check what went wrong.

      You can check the Metabase log which should be located in /var/log/metabase.log and check for any killed processes in /var/log/messages like this:

      grep -i kill /var/log/messages```

      Regards,
      Alex

      Reply Report
      • dwihdyn789 April 2, 2020

        Hi @alexdo,

        Ever since that i followed your solution on using sudo service metabase start , my metabase tends to crash much more often with the output below when i check using sudo service metabase status :

        ● metabase.service - Metabase
   Loaded: loaded (/etc/systemd/system/metabase.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Wed 2020-04-01 20:01:37 UTC; 13h ago
  Process: 20014 ExecStart=/opt/metabase/metabase.sh (code=exited, status=137)
 Main PID: 20014 (code=exited, status=137)

        How can i solve this issue to make sure that it does not crash oftenly ya ? also i tried to find the log just to figure out the issue at /var/log/metabase.log . Given file does not exist. Where can i find it ya ?

        Thank you,
        Dwi

        Reply Report
        • alexdo April 2, 2020

          Hello, @dwihdyn789

          What you can do is to set a cron job that will check if the metabase service is running and if not to start it automatically. The cron job can be configured to run once every minute.

          As for the errorlog if the file is not present you can check the metabase configuration file and check if the errorlog is saved in different directory.

          Also the log file location can be specified when running the java command:

          -Dlogfile.path=/path

          Also you can check the syslog for any logged error messages as well.

          Hope this helps!

          Regards,
          Alex

          Reply Report
          • dwihdyn789 April 18, 2020

            Hi @alexdo,

            Thank you for the answer, however ive been trying to setup cronjob for metabase and seems that its still not working

            Could you share us the code for the cronjob here that it will run every minute ? would really means alot

            Really appreciate it and thank you!
            Dwi

            Reply Report
alexdo October 31, 2019

Hello, @caioac87

May I ask if you access the site using a domain name or via the IP address of your server/droplet? If you’re using a domain name can you please check/verify that the domain name is properly pointed to your droplet and that the DNS is working fine? You can use https://www.whatsmydns.net/ and check if the A record is pointed to the IP address of your server.

Let me know how it goes.

Reply Report
caioac87 October 31, 2019

I’m using the IP address… no DNS setup

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  • alexdo March 26, 2020

    Hello, @caioac87

    Can you please make sure that java is running on port 3000? I’ve just spin a test Metabase droplet and everything is working just fine. You can check if Java is running with netstat:

    netstat -plunt | grep 3000

    Note: Please note that a Metabase droplet is deployed allow 2 to 5 minutes so that Metabase starts all required services. This delay only happens when the droplet is created and not afterwards.

    Another option is to access by using an ssh tunnel, with nice benefit of being encrypted. Run this command from the terminal:

    ssh -f root@134.209.125.2 -L 3000:134.209.125.2:3000 -N

    And then, from the browser go to localhost:3000. The first step with Metabase is to create an administrator for the application, complete the information and add a password that can be the same as the password for system administrator paul or a different password.

    Hope this Helps!

    Regards,
    Alex

    Reply Report
dwihdyn789 March 25, 2020

Hi @alexdo, Im having the same issue right here, where Im using IP address to access, and i am encountering the same issue. Appreciate if you could assist us on this issue :)

This site can’t be reached
111:111:11:11  refused to connect.

Hi @caioac87 , have you managed to find any solution for this ?

Reply Report
  • alexdo March 26, 2020

    Hello, @dwihdyn789

    Can you please make sure that java is running on port 3000? I’ve just spin a test Metabase droplet and everything is working just fine. You can check if Java is running with netstat:

    netstat -plunt | grep 3000

    Note: Please note that a Metabase droplet is deployed allow 2 to 5 minutes so that Metabase starts all required services. This delay only happens when the droplet is created and not afterwards.

    Another option is to access by using an ssh tunnel, with nice benefit of being encrypted. Run this command from the terminal:

    ssh -f root@134.209.125.2 -L 3000:134.209.125.2:3000 -N

    And then, from the browser go to localhost:3000. The first step with Metabase is to create an administrator for the application, complete the information and add a password that can be the same as the password for system administrator paul or a different password.

    Hope this Helps!

    Regards,
    Alex

    Reply Report
    • dwihdyn789 March 27, 2020

      Hi @alexdo, did that and nothing works :(

      we ran netstat -plunt | grep 3000 , nothing came out

      and when i ran ssh -f root@134.209.125.2 -L 3000:134.209.125.2:3000 -N, below are the output :

      channel 3: open failed: connect failed: Connection refused
channel 2: open failed: connect failed: Connection refused
channel 2: open failed: connect failed: Connection refused
channel 3: open failed: connect failed: Connection refused
channel 2: open failed: connect failed: Connection refused
channel 2: open failed: connect failed: Connection refused
channel 3: open failed: connect failed: Connection refused
channel 2: open failed: connect failed: Connection refused
channel 2: open failed: connect failed: Connection refused
channel 3: open failed: connect failed: Connection refused

      Our last resort will be destroy this current droplet & re-create the Metabase droplet from marketplace, hopefully we dont need to go down that path, as there are my data in psql are there

      Any other method i should try ?

      Thank you

      Reply Report
      • alexdo March 30, 2020

        If you can’t see java running when you use netstat than it means that Metabase is not running on your droplet.

        You can confirm this by executing the following command:

        service metabase status

        If the service is not started you can start/restart it:

        sudo service metabase start

        Note: This might take up some time to run and actually start the service, if you still can’t access the Metabase in your browser try to manually start it using the commands bellow

        The script that start the service is:

        /opt/metabase/metabase.sh

        You can execute this and wait for couple of minutes to complete.

        You also need to start Java by executing the following command:

        java -jar /opt/metabase/metabase.jar

        If this is a new droplet I will recommend you to quickly spin up a new Metabase droplet as this will take less than 10 minutes to have it up and running.

        Hope this helps!

        Regards,
        Alex

        Reply Report
alexdo April 19, 2020

Hey, @dwihdyn789

You can create a simple bash script to check if the service is running and if not to start it. You can then execute the bash script with a cron job whenever you want (once per minute and etc)

#!/bin/bash

service=$@
/bin/systemctl -q is-active "$metabase.service"
status=$?
if [ "$status" == 0 ]; then
    echo "OK"
else
    /bin/systemctl start "$metabase.service"
fi

You can check this task for creating cron jobs:

https://www.digitalocean.com/community/tutorials/how-to-use-cron-to-automate-tasks-ubuntu-1804

The cron job should look like:

* * * * * /bin/sh /path/to/script/script.sh > /dev/null 2>&1

* * * * * - Run the command every minute.

Hope this helps!

Regards,
Alex

How To Use Cron to Automate Tasks on Ubuntu 18.04
by Mark Drake
Cron is a time-based job scheduling daemon found in Unix-like operating systems, including Linux distributions. This guide provides an overview of how to schedule tasks using cron's special syntax on a machine running Ubuntu 18.04. It also goes over a few shortcuts one can use to make job schedules easier to write and understand.
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