Note: the article is related to the issue that occurs after Apache upgrade (during dist-upgrade for example).
After failed Plesk upgrade on Debian OS with Apache version 2.4 installed, web server is not starting.
The following error messages appears:
apache2: Syntax error on line 234 of /etc/apache2/apache2.conf: Syntax error on line 5 of /etc/apache2/conf.d/zz010_psa_httpd.conf: Syntax error on line 72 of /etc/apache2/plesk.conf.d/server.conf: No matches for the wildcard '*.conf' in '/etc/apache2/plesk.conf.d/ip_default', failing (use IncludeOptional if required)
Action 'configtest' failed.
The Apache error log may have more information.
Invalid command 'Order', perhaps misspelled or defined by a module not included in the server configuration
SSLSessionCache: 'shmcb' session cache not supported (known names: dbm,memcache). Maybe you need to load the appropriate socache module (mod_socache_shmcb?).
The apache2 instance did not start within 20 seconds. Please read the log files to discover problems.
[proxy_balancer:emerg] [pid 25870] AH01177: Failed to lookup provider 'shm' for 'slotmem': is mod_slotmem_shm loaded?
Invalid command 'Require', perhaps misspelled or defined by a module not included in the server configuration
Invalid command 'User', perhaps misspelled or defined by a module not included in the server configuration1.
Invalid command 'DirectoryIndex', perhaps misspelled or defined by a module not included in the server configuration
ERROR: Config file dir.conf not properly enabled: /etc/apache2/mods-enabled/dir.conf is a real file, not touching it
Configuration files were not completely switched to the new Apache 2.4
Check if custom templates exist in
/usr/local/psa/admin/conf/templatesfolder. If so review all of them and change
IncludeOptionalin every line what contain wildcard.
If there are no custom templates change
IncludeOptionalin every line what contain wildcard in the following files:
Enable and activate the following Apache modules
# a2enmod authz_core authz_host access_compat socache_shmcb slotmem_shm mpm_worker unixd php5 dir