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83 lines
4.6 KiB
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Linux FAQs with Answers--What is the Apache error log location on Linux
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> **Question**: I am trying to troubleshoot Apache web server errors on my Linux system. Where is the Apache error log file located on [insert your Linux distro]?
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Error log and access log files are a useful piece of information for system admins, for example to troubleshoot their web server, [protect][1] it from various malicious activities, or just to run [various][2] [analytics][3] for HTTP server monitoring. Depending on your web server setup, its error/access logs may be found in different places on your system.
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This post may help you **find Apache error log location on Linux**.
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### Apache Error Log Location on Debian, Ubuntu or Linux Mint ###
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#### Default Error Log ####
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On Debian-based Linux, the system-wide default location of Apache error log is **/var/log/apache2/error.log**. The default location can be customized by editing Apache configuration file.
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#### Custom Error Log ####
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To find a custom error log location, open /etc/apache2/apache2.conf with a text editor, and look for a line that starts with ErrorLog. This line specifies a custom location of Apache error log file. For example, the unmodified Apache configuration file has the following line:
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ErrorLog ${APACHE_LOG_DIR}/error.log
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In this case, the location is configured using APACHE_LOG_DIR environment variable, which is defined in /etc/apache2/envvars.
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export APACHE_LOG_DIR=/var/log/apache2$SUFFIX
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In reality, ErrorLog may point to any arbitrary path on your Linux system.
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#### Custom Error Log with VirtualHost ####
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If VirtualHost is used in Apache web server, ErrorLog directive can be specified within VirtualHost container, in which case the system-wide error log location described above will be ignored.
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With VirtualHost enabled, each VirtualHost can define its own custom error log location. To find out the error log location of a particular VirtualHost, you can open /etc/apache2/sites-enabled/<your-site>.conf, and look for ErrorLog directive, which will show a site-specific error log file.
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### Apache Error Log Location on CentOS, Fedora or RHEL ###
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#### Default Error Log ####
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On Red Hat based Linux, a system-wide Apache error log file is by default placed in **/var/log/httpd/error_log**. This default location can be customized by editing Apache configuration file.
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#### Custom Error Log ####
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To find out the custom location of Apache error log, open /etc/httpd/conf/httpd.conf with a text editor, and look for ServerRoot, which shows the top of the Apache server directory tree, under which log files and configurations are located. For example:
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ServerRoot "/etc/httpd"
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Now look for a line that starts with ErrorLog, which indicates where Apache web server is writing its error logs. Note that the specified location is relative to the ServerRoot value. For example:
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ErrorLog "log/error_log"
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Combine the above two directives to obtain the full path of an error log, which is by default /etc/httpd/logs/error_log. This is a symlink to /var/log/httpd/error_log with freshly installed Apache.
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In reality, ErrorLog may point to any arbitrary location on your Linux system.
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#### Custom Error Log with VirtualHost ####
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If you enabled VirtualHost, you can find the error log location of individual VirtualHosts by checking /etc/httpd/conf/httpd.conf (or any file where VirtualHost is defined). Look for ErrorLog inside individual VirtualHost sections. For example, in the following VirtualHost section, an error log is found in /var/www/xmodulo.com/logs/error_log.
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<VirtualHost *:80>
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ServerAdmin webmaster@xmodulo.com
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DocumentRoot /var/www/xmodulo.com/public_html
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ServerName www.xmodulo.com
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ServerAlias xmodulo.com
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ErrorLog /var/www/xmodulo.com/logs/error_log
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CustomLog /var/www/xmodulo.com/logs/access_log
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<VirtualHost>
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/apache-error-log-location-linux.html
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作者：[Dan Nanni][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni
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[1]:http://xmodulo.com/configure-fail2ban-apache-http-server.html
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[2]:http://xmodulo.com/interactive-apache-web-server-log-analyzer-linux.html
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[3]:http://xmodulo.com/sql-queries-apache-log-files-linux.html
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