Unable to start Apache: AH02093: mod_watchdog is required

Created:

2016-12-25 01:04:06 UTC

Modified:

2017-08-08 13:17:20 UTC

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Unable to start Apache: AH02093: mod_watchdog is required

Applicable to:

  • Plesk Onyx for Linux

Symptoms

  • Apache fails to start.
  • Domain reconfiguration fails with the following error:
    ERR [util_exec] proc_close() failed ['/usr/local/psa/admin/bin/apache-config' '-t'] with exit code [1] 
    ERR [util_exec] proc_close() failed ['/usr/local/psa/admin/bin/apache-config' '-t'] with exit code [1] 
    ERR [panel] Apache config (14826243450.06706200) generation failed: Template_Exception: httpd: Syntax error on line 56 of /etc/httpd/conf/httpd.conf: Syntax error on line 79 of /etc/httpd/conf.modules.d/00-base.conf: Cannot load /usr/lib64/httpd/modules/mod_proxy_fcgi.plesk.so into server: /usr/lib64/httpd/modules/mod_proxy_fcgi.plesk.so: undefined symbol: proxy_module
    file: /usr/local/psa/admin/plib/Template/Writer/Webserver/Abstract.php 
    line: 75 
    code: 0 
    httpd: Syntax error on line 56 of /etc/httpd/conf/httpd.conf: Syntax error on line 79 of /etc/httpd/conf.modules.d/00-base.conf: Cannot load /usr/lib64/httpd/modules/mod_proxy_fcgi.plesk.so into server: /usr/lib64/httpd/modules/mod_proxy_fcgi.plesk.so: undefined symbol: proxy_module
  • /var/log/httpd/error_log contains following error records:
    [suexec:notice] [pid 10237:tid 140298335291520] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
    [heartmonitor:crit] [pid 10237:tid 140298335291520] AH02093: mod_watchdog is required
    AH00016: Configuration Failed

Cause

Module mod_watchdog is disabled.

Resolution

Enable the module in /etc/httpd/conf.modules.d/00-base.conf by uncommenting the line:

LoadModule watchdog_module modules/mod_watchdog.so
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