Issue Apache breaks because of hosts not set permanently, IPv4, hostname, 502 Bad Gateway

[Anton Keller]

Hi,
It seems while rebuilding templates with the plesk repair tool, I got more errors and the site shows a
"502 Bad Gateway" error
Can someone help me out?

Unable to configure the web server: Execution failed. Command: httpdmng Arguments: Array ( [0] => --reconfigure-all ) Details: Execution failed. Command: httpdmng Arguments: Array ( [0] => --reconfigure-domains [1] => mysite.com,myothersite.com ) Details: [2019-06-04 10:20:25.368] ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/apache_control_adapter' '--restart' '--restart-interval' '0' '--http-port' '7080' '--https-port' '7081'] with exit code [255] [2019-06-04 10:20:26.071] ERR [panel] Apache config (15596362950.78857600) generation failed: Template_Exception: Can not restart web server: file: /opt/psa/admin/plib/Service/Driver/Web/Server/Apache.php line: 111 code: 0 Can not restart web server:

 

[IgorG]

This issue is commonly related to no IPv4 specified for the server name in the /etc/hosts file.

To correct it please follow this article Unable to start Apache: Unable to find IPv4 address of server.example.com

 

[Anton Keller]

It did not work, I had to do it this way:
The /etc/hosts file gets overwritten after a server reboot: Your system has configured 'manage_etc_hosts' as True
since the message was to set it to false, no luck. Any other way before I recreate my server ?

 

[Anton Keller]

I can provide logs if someone guides me.. Cheers!

 

[WebHostingAce]

Did you try to change "Apache Web Server" configuration? Tools & Settings?

This happened to me once when I removed required Apache Modules.

 

[Anton Keller]

I don't think I did but maybe..
this is the new error I got right after doing the last tweak I mentioned:

Error: Can not reconfigure web server configurations: Unable to execute httpdmng: [2019-06-05 15:19:47.593] ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/apache_control_adapter' '--restart' '--restart-interval' '0' '--http-port' '7080' '--https-port' '7081'] with exit code [255]
[2019-06-05 15:19:49.180] ERR [panel] Apache config (15597406570.96238700) generation failed: Template_Exception: Can not restart web server:
file: /opt/psa/admin/plib/Service/Driver/Web/Server/Apache.php
line: 111
code: 0
Can not restart web server:

 

[Bitpalast]

It normally does not start due to errors in configuration files. The Apache error log gives you all the details needed to find the reason.

 

[Anton Keller]

Hi Peter, all I get from the log files is this multiple times :
8195#0: *3339 connect() failed (111: Connection refused) while connecting to upstream nginx error

It may be an Nginx error but I can't solve it.

 

[Anton Keller]

@IgorG or team member, can you help with the conf problem?
My Report ID is TR-PLSK-41938

 

[WebHostingAce]

8195#0: *3339 connect() failed (111: Connection refused) while connecting to upstream nginx error

This error is from NGINX. Also it means the Apache is not working. So the error is not related to NGINX.

Tools & Settings > Service Management then Stop the NGINX.

Then try to restart Apache via SSH. It will give you a details error message to troubleshoot.

 

[IgorG]

My Report ID is TR-PLSK-41938

This report is where? Not like taking our reports numbering.

 

[IgorG]

And what about

# plesk repair web

at least?

 

[Anton Keller]

Don't know what you mean.. the troubleshooter tells me there is a problem in Apache template and it cannot repair it. I didn't touch any template myself, except the thing you pointed the other day that did nothing.
Now I stopped the Nginx in service Management , I tried to start Apache from SSH with
service apache2 start
Then nothing at all
Cannot start it either from service management.
For the report, I don't know what it contains exactly, I thought you guys have access to it from an ID I gave you. If not, I won't post it here unless it's common practice.

 

[WebHostingAce]

ok..

When you stop NGINX via Panel.

Then #service apache2 restart

Do you get Active: active (running) When you run #service apache2 status ?

 

[Anton Keller]

I got:
apache2.service - LSB: Apache2 web server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled)
Drop-In: /lib/systemd/system/apache2.service.d
└─forking.conf
Active: inactive (dead) since Thu 2019-06-06 10:38:41 CEST; 38s ago
Process: 19997 ExecStop=/etc/init.d/apache2 stop (code=exited, status=0/SUCCESS)
Process: 19982 ExecStart=/etc/init.d/apache2 start (code=exited, status=0/SUCCESS)

Jun 06 10:38:41 stock.ovh systemd[1]: Starting LSB: Apache2 web server...
Jun 06 10:38:41 stock.ovh apache2[19982]: Starting web server: apache2Action 'start' failed.
Jun 06 10:38:41 stock.ovh apache2[19982]: The Apache error log may have more information.
Jun 06 10:38:41 stock.ovh apache2[19982]: .
Jun 06 10:38:41 stock.ovh apache2[19997]: Stopping web server: apache2.
Jun 06 10:38:41 stock.ovh systemd[1]: Started LSB: Apache2 web server.

 

[Anton Keller]

I confirm NGINX is stopped, and via panel.

 

[IgorG]

My Report ID is TR-PLSK-41938

Well. This is just a technical report to the reporting system without any problem description, steps to reproduce, expected results, etc. You have to submit a support ticket with all these details and as a very useful addition for the further ticket processing just point to this report id.

 

[WebHostingAce]

ok.. you can now check the Apache Error Log. It will tell you exactly which Apache Template has the issue.

EDIT - # vi /var/log/apache2/error.log

 

[Anton Keller]

Sorry but this file is empty: /var/log/apache2/access.log
I tried vim and nano to be sure.

I may just give up since this thread is taking time from everyone. Feel free to continue help if you feel like it.

 

[WebHostingAce]

Sorry, I edited the path/file.

Please check /var/log/apache2/error.log