The Apache error log doesn’t fill missing parameters. The sample log message lacks a message for the %E setting, so it’s missing. The setting is a format string with parameters corresponding to fields in a logging event. Here’s what a request looks like now: core.c(4739): AH00128: File does not exist: /usr/local/apache2/htdocs/favicon.ico I’ll use this example from the Apache docs. Let’s try a different setting and look at the difference. You specify the message composition with the ErrorLogFormat setting. So far, I’ve been using the default format. You can change the format of log messages too. We can see that the real problem with my web server is no favicon and my browser is very upset about it. AH00128: File does not exist: /usr/local/apache2/htdocs/favicon.ico This setting sets the server for debug, but explicitly filters the authz_core back to info. If you want to watch the logs for other modules while filtering out messages from it, you can set its log level explicitly. You can see that the authz_core module is very noisy. mod_authz_core.c(820): AH01626: authorization result of Require all granted: granted mod_authz_core.c(820): AH01626: authorization result of : granted I’ll request a valid page and then an invalid one with each level.Īpache logs nothing for a single page request in warn level.īut, here’s the same request in debug level: mod_authz_core.c(820): AH01626: authorization result of Require all granted: granted Let’s make a quick comparison of the warn and debug levels. Trace messages with gradually increasing levels of detail The Apache documentation describes the levels this way: Level # Possible values include: debug, info, notice, warn, error, crit, # LogLevel: Control the number of messages logged to the error_log.
You specify the level with the LogLevel setting. The Apache error log has a logging level that filters the messages sent to the log. ErrorLog "|/usr/local/bin/httpd_errors"Īpache interprets the pipe character to mean it should pipe the messages to the specified command. You can find the details here.įinally, you can direct logs to a Linux command. The Syslog option has several different choices about the logging facility and the application name. Instead of a filename, use the Syslog directive. You can also send log messages to a Syslog server. So if you want to rotate log files to keep them from getting too large, you need to set something up on your own. If the file already exists, Apache will append new messages to it. You can enter any valid filename and the Apache will use it. This configuration directs the logs to standard error, which is a sensible setting for most Docker environments. # container, that host's errors will be logged there and not here. If you *do* define an error logfile for a # container, error messages relating to that virtual host will be # If you do not specify an ErrorLog directive within a
# ErrorLog: The location of the error log file. Here’s the default setting for the Apache2 docker image: # The ErrorLog configuration setting controls the location of the Apache error log file. I’ll cover the settings for the Apache error log in this post.
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You can find details for how to set up configuration files for Apache here. I’ll be referring to the latest release of the web server in this post, which is 2.4 as of this writing.’ You configure the error log with a set of directives that, like all Apache configuration values, you place in plain text files. Let’s dive in and see how you can use the Apache error log to watch your web server and improve its reliability and resiliency. You have control over where it stores the messages and what information goes into them. Apache records a large amount of diagnostic information in the error log. You can even say Apache misnamed the file because it contains more than just errors. If you’re responsible for one of those systems, you need to work with the Apache error log.Īpache provides comprehensive logging via several different files, but the error log is the most important. At least 43% of those systems are running the Apache HTTP Server. Many online applications use a web server as the primary point of contact for their clients.
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