问题
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.
回答1:
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) `<snip>.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 ;)
回答2:
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.
回答3:
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
回答4:
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..
回答5:
On XAMPP use
D:\xampp\apache\bin>httpd -t -D DUMP_VHOSTS
This will yield errors in your configuration of the virtual hosts
回答6:
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.
回答7:
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.
回答8:
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/
回答9:
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
回答10:
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
来源：https://stackoverflow.com/questions/18975962/failed-apache2-start-no-error-log