Failed Apache2 start no error log

Question

I would restart Apache2 but there comes an Error    sudo service apache2 start  Starting web server apache2  Action  start  failed  The Apache error log may have more information    But all error logs in   var log apache2   are empty    Edit  The Files are at   var log apache2  and there are several entries from previous Problems but this Task doesn t create any new etry      Where is the Problem     I ve Solved the Problem   It was a error in the SSL Certificate and the path to the  error log  are changed in the vHost configuration   If you don t need SSL  i don t because i m running a local system  simply disable all vHost HTTPS SSL entrys in the configuration by command line for line out

User · Answer

If we have no entries in log files then we can try to debug apache2 using this command:

$ apache2 -S

or

$ apache2 -e debug

Possible output:

[Fri Apr 05 04:04:59.682880 2019] [core:warn] [pid 11086] AH00111: Config variable ${APACHE_RUN_DIR} is not defined
apache2: Syntax error on line 80 of /etc/apache2/apache2.conf: DefaultRuntimeDir must be a valid directory, absolute or relative to ServerRoot

User · Answer

I ran into this exact issue today  I had copied the entire  etc httpd from RHEL 6 and put it onto a CentOS 6 system  and ensured all RPMs were installed   Anytime apache would be started  it would silently fail  It took an strace to find the culprit  I was using CustomLog to call a program that was not installed on the target system  Once I installed the expected program  Apache HTTP Server started right up

User · Answer

I ran into this problem on the Raspberry Pi   After trying everything but a reinstall  on a whim  I deleted  var run apache2 apache2 pid   I restarted Apache and everything worked   Not sure how to explain that

User · Answer

On XAMPP use  D  xampp apache bin gt httpd -t -D DUMP VHOSTS   This will yield errors in your configuration of the virtual hosts

User · Answer

I also just ran in to a similar problem  that is service apache2 reload fails but prints no useful information  This is because the script in  etc init d apache  on Debian  at least  eats the output of the apache2ctl configtest command it runs to sanitize the Apache config   An easy solution to get a more meaningful explanation for the failure is to run apache2ctl configtest again yourself  which will print the  hopefully useful  error messages to the console

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Try to disable SElinux or configuration virtualhost for SElinux  to configuration with SElinux https   muchbits com apache-selinux-vhosts html  to disable SElinux https   linuxize com post how-to-disable-selinux-on-centos-7

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Syntax errors in the config file seem to cause problems   I found what the problem was by going to the directory and excuting this from the command line   httpd -e info    This gave me the error  Syntax error on line 156 of D      Apache Software Foundation Apache2 2 conf httpd conf  Invalid command  PHPIniDir   perhaps misspelled or defined by a module not included in the server configuration

User · Answer

in the apache virtualhost you have to define the path to the error log file      when apache2 start for the first time it will create it automatically   for example ErrorLog   var www www localhost com log-apache2 error log  in the apache virtualhost

User · Answer

On Apache on Linux there might be a problem that the configuration cannot be checked because of a problem with environment variables not being set  This is a false positive which only occurs when running apache2 -S from commandline  See previous answer from  simhumileco   For instance Config variable   APACHE RUN DIR  is not defined    In order to fix this run source  etc apache2 envvars from the commandline and then run  apache2 -S  to get to the real  possible  problems   root fileserver    apache2 -S  Thu Apr 30 10 42 06 822719 2020   core warn   pid 24624  AH00111  Config variable   APACHE RUN DIR  is not defined apache2  Syntax error on line 80 of  etc apache2 apache2 conf  DefaultRuntimeDir must be a valid directory  absolute or relative to ServerRoot root fileserver    source  etc apache2 envvars root fileserver  root  apache2 -S AH00558  apache2  Could not reliably determine the server s fully qualified domain name  using 127 0 1 1  Set the  ServerName  directive globally to suppress this message VirtualHost configuration   lt ----snip---- gt  ServerRoot    etc apache2  Main DocumentRoot    var www html  Main ErrorLog    var log apache2 error log  Mutex ldap-cache  using defaults Mutex default  dir   var run apache2   mechanism default Mutex mpm-accept  using defaults Mutex watchdog-callback  using defaults PidFile    var run apache2 apache2 pid  Define  DUMP VHOSTS Define  DUMP RUN CFG User  name  www-data  id 33 Group  name  www-data  id 33 root fileserver  root

User · Answer

You have following ways to make it work    Delete  var run apache2 apache2 pid then check if its working You can disable SELinux and then check if it works  You can disable SELinux permanantly or temporarily by using https   linux4one com how-to-disable-selinux-on-centos-7  tutorial

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Thanks  Tim   Big stumper for me   A few other details others may find helpful    Apache2 on Ubuntu 12 04   I have two sites running on the same server and had just updated the SSL cert for one of them   Upon restarting the server  I got that cryptic message and neither site worked  obviously    I too found the redirect for the log files in the config files   I tracked that down and found the issue  in the log file for the site I had just updated    My config files are located in  etc apache2 sites-available  vim or cat the file  cat  filename   and look for the ErrorLog line   That tells you where to look on your server   cat that file and the error message I found was    error  Unable to configure RSA server private key  error  SSL Library Error  185073780 error 0B080074 x509 certificate routines X509 check private key key values mismatch  warn  RSA server certificate CommonName  CN    lt snip gt  com  does NOT match server name     I had copied one of my cert files to the wrong directory   I simply moved it to the correct directory and everything was fine on the next start    tip  where those file should be is also in the config file

[apache2] Failed Apache2 start, no error log

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