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Blank Pages after upgrade 24.10.24 on Debian version 12.13

  • May 14, 2026
  • 3 replies
  • 25 views
S
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Hello,

Most of the Centreon web menu pages appear blank since the update. I've cleared my browser cache, tested in incognito mode, and cleared the Symfony cache. Nothing works.I checked the logs in /var/log/apache2/error.log and found this, but it might be unrelated:

[Thu May 14 12:46:32.281519 2026] [proxy_fcgi:error] [pid 774:tid 774] [client 82.66.247.24:65357] AH01071: Got error 'PHP message: PHP Warning:  Undefined variable $sessionKeyFreeze in /usr/share/centreon/www/include/Administration/parameters/general/form.php on line 279; PHP message: PHP Warning:  touch(): Utime failed: Syst\xc3\xa8me de fichiers accessible en lecture seulement in /usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php on line 178; PHP message: PHP Warning:  touch(): Utime failed: Syst\xc3\xa8me de fichiers accessible en lecture seulement in /usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php on line 188', referer: http://xxxxxxxxxxxxxxxxxxxx/centreon/main.php?p=50110&o=general
 

(xxxxxxxxxxxxxx : is the server of my centreon)

 

I attempted the upgrade to version 25.10, and when I finalize the upgrade by accessing the web page (http://xxxxxxxxxxxxxxx/centreon/install/upgrade.php), I get a gray page. 
I now have this and the issue with smarty_template_compiled.php is still being raised.

[2026-05-14T12:46:24+02:00] CRITICAL : An error occurred while displaying the error template : unable to create directory /usr/share/centreon/www/templates_c | {"custom":{"error_message":"unable to create directory /usr/share/centreon/www/templates_c"},"exception":{"exceptions":[{"type":"SmartyException","message":"unable to create directory /usr/share/centreon/www/templates_c","file":"/usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_internal_runtime_writefile.php","line":45,"code":0,"class":"Smarty_Internal_Runtime_WriteFile","method":"writeFile"}],"traces":[{"file":"/usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php","line":209,"function":"writeFile","class":"Smarty_Internal_Runtime_WriteFile","type":"->"},{"file":"/usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php","line":184,"function":"write","class":"Smarty_Template_Compiled","type":"->"},{"file":"/usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php","line":141,"function":"compileTemplateSource","class":"Smarty_Template_Compiled","type":"->"},{"file":"/usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php","line":105,"function":"process","class":"Smarty_Template_Compiled","type":"->"},{"file":"/usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php","line":217,"function":"render","class":"Smarty_Template_Compiled","type":"->"},{"file":"/usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php","line":238,"function":"render","class":"Smarty_Internal_Template","type":"->"},{"file":"/usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php","line":134,"function":"_execute","class":"Smarty_Internal_TemplateBase","type":"->"},{"file":"/usr/share/centreon/GPL_LIB/smarty-plugins/SmartyBC.php","line":569,"function":"display","class":"Smarty_Internal_TemplateBase","type":"->"},{"file":"/usr/share/centreon/www/include/home/customViews/index.php","line":346,"function":"display","class":"SmartyBC","type":"->"},{"file":"/usr/share/centreon/www/main.get.php","line":292,"args":["/usr/share/centreon/www/include/home/customViews/index.php"],"function":"include_once"}]},"default":{"request_infos":{"uri":"/centreon/main.get.php?p=103","http_method":"GET","server":"xxxxxxxxxxxxxxxxxxxx"}}}
 

I tried creating the templates_c directory with centreon:centreon permissions and chmod 775, but then the errors continue: it is not possible to create files in this directory.

 

Best regards

Best answer by MajorFault

I had a similar issue after installing the latest PHP 8.2 update from Debian. The update contained this note:
 

php8.2 (8.2.31-2) unstable; urgency=medium

  * The systemd unit file has been hardened.  Extra options from
    sapi/fpm/php-fpm.service.in has been used:

    PrivateTmp=true
    ProtectSystem=full
    PrivateDevices=true
    ProtectKernelModules=true
    ProtectKernelTunables=true
    ProtectControlGroups=true
    RestrictRealtime=true
    RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_UNIX
    RestrictNamespaces=true

    This should work in the default environments, but you might need
    to modify the systemd unit file if you are using less standard
    FPM configuration.


This broke Centreon for me, resulting in the error:

PHP Warning:  touch(): Utime failed: Read-only file system in /usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php 
on line 178;


Workaround: Create an override for the php8.2-fpm.service:

systemctl edit php8.2-fpm.service

Disable ProtectSystem:

[Service]
ProtectSystem=false

Reload and restart:

systemctl daemon-reload
systemctl restart php8.2-fpm.service

 

This worked for me.

    3 replies

    S
    Forum|alt.badge.img+1
    • SystemFailure
    • Author
    • Steward *
    • May 14, 2026

    I am convinced that the problem stems from the update of the php-8.1 to php-8.2 packages, but I haven't been able to find the reason.

    M
    Forum|alt.badge.img+1
    • MajorFault
    • Steward *
    • Answer
    • May 14, 2026

    I had a similar issue after installing the latest PHP 8.2 update from Debian. The update contained this note:
     

    php8.2 (8.2.31-2) unstable; urgency=medium

      * The systemd unit file has been hardened.  Extra options from
        sapi/fpm/php-fpm.service.in has been used:

        PrivateTmp=true
        ProtectSystem=full
        PrivateDevices=true
        ProtectKernelModules=true
        ProtectKernelTunables=true
        ProtectControlGroups=true
        RestrictRealtime=true
        RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_UNIX
        RestrictNamespaces=true

        This should work in the default environments, but you might need
        to modify the systemd unit file if you are using less standard
        FPM configuration.


    This broke Centreon for me, resulting in the error:

    PHP Warning:  touch(): Utime failed: Read-only file system in /usr/share/centreon/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php 
    on line 178;


    Workaround: Create an override for the php8.2-fpm.service:

    systemctl edit php8.2-fpm.service

    Disable ProtectSystem:

    [Service]
    ProtectSystem=false

    Reload and restart:

    systemctl daemon-reload
    systemctl restart php8.2-fpm.service

     

    This worked for me.

    S
    Forum|alt.badge.img+1
    Yes, it works, thank you so much!
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