Resolved error 502 bad gateway when nginx is enabled

[fferraro87]

Hi,

yesterday night i've all my sites on my plesk with this error "502 bad gateway" from nginx.
After that i've disabled nginx everything now it works fine.

I've tried to uninstall and reinstall nginx and also i've tried to use "plesk repair web" and nothing changed.

I've this plesk installed :

Product version: Plesk Onyx 17.5.3 Update #23
    Update date: 2017/09/25 14:27
     Build date: 2017/03/17 16:00
     OS version: CentOS 7.4.1708
       Revision: 55d1b49a272f44666e1920eca8b6e4da449a38cd
   Architecture: 64-bit
Wrapper version: 1.2

what can i do?

 

[IgorG]

If you try to search phrase "502 bad gateway nginx" in Plesk KB articles, you will see that many different reasons may cause this issue. Therefore, a simple declaration of a problem is not enough. More details are needed to reduce the number of different reasons. It would be very useful to see the messages related to this problem from the logs.

 

[fferraro87]

yeah sorry, in the nginx log i don't have strange error, instead on error log on httpd i've many lines like this :

PHP Warning:  PHP Startup: Unable to load dynamic library '/opt/plesk/php/5.6/lib64/php/modules/memcache.so' - /opt/plesk/php/5.6/lib64/php/modules/memcache.so: cannot open shared object file: No such file or directory in Unknown on line 0

maybe this can be the problem?

Thanks

 

[IgorG]

Looks like that you have defined memcache.so php module in php5.6 config (ini file) but haven't it installed. Find this ini file with

# grep -R memcache.so /opt/plesk/php/5.6/etc/*

and comment this line in config file. After that run

# plesk bin php_handler --reread

 

[fferraro87]

Looks like that you have defined memcache.so php module in php5.6 config (ini file) but haven't it installed. Find this ini file with

# grep -R memcache.so /opt/plesk/php/5.6/etc/*

and comment this line in config file. After that run

# plesk bin php_handler --reread

i don't have any output from first command

 

[IgorG]

Please doublecheck my command

grep -R memcache.so /opt/plesk/php/5.6/etc/*

 

[fferraro87]

Please doublecheck my command

grep -R memcache.so /opt/plesk/php/5.6/etc/*

yeah sure that's screenshot from this command

 

[IgorG]

Maybe you have specified memcache.so module in one of subscription's PHP settings?

 

[fferraro87]

well i don't know if some users has added memcache in their subscriptions. so i've to check all subscriptions?

 

[IgorG]

Try to check it with

# grep -R memcache.so /var/www/vhosts/system/*

 

[fferraro87]

ok i've found one subscription with memcache enabled and i've remove this, i've restarted nginx and now it works.

Thanks