Apache Error Writing To Log File. Messages Lost
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flexible logging capabilities. This document describes how to configure its logging capabilities, and how to understand what the logs contain. Security Warning
Apache Logs Location
Error Log Access Log Common Log Format Combined Log Format Multiple Access apache log format example Logs Conditional Logging Log Rotation Piped Logs Virtual Hosts Other Log Files PID File Script Log Rewrite Log apache logs ubuntu Security Warning Anyone who can write to the directory where Apache is writing a log file can almost certainly gain access to the uid that the server is started as, which
Apache Logs Centos
is normally root. Do NOT give people write access to the directory the logs are stored in without being aware of the consequences; see the security tips document for details. In addition, log files may contain information supplied directly by the client, without escaping. Therefore, it is possible for malicious clients to insert control-characters in the log files, so care must be
Httpd Logs Location
taken in dealing with raw logs. Error Log Related Directives ErrorLog LogLevel The server error log, whose name and location is set by the ErrorLog directive, is the most important log file. This is the place where Apache httpd will send diagnostic information and record any errors that it encounters in processing requests. It is the first place to look when a problem occurs with starting the server or with the operation of the server, since it will often contain details of what went wrong and how to fix it. The error log is usually written to a file (typically error_log on unix systems and error.log on Windows and OS/2). On unix systems it is also possible to have the server send errors to syslog or pipe them to a program. The format of the error log is relatively free-form and descriptive. But there is certain information that is contained in most error log entries. For example, here is a typical message. [Wed Oct 11 14:32:52 2000] [error] [client 127.0.0.1] client denied by server configuration: /export/home/live/ap/htdocs/test The first item in the log entry
Windows No Yes Yes Why does rotatelogs not support large files on some platforms? This applies to IBM HTTP Server 2.0 through 6.1. The web server and rotatelogs use file access interfaces provided apache error log format by the Apache Portable Runtime (APR) library bundled with IBM HTTP Server. The
Apache Log File Format
APR provided with IBM HTTP Server on these platforms cannot support file offsets larger than 2GB without introducing an API apache log example incompatibility, which would break all current plug-in modules written for IBM HTTP Server. However, it was possible to enable large file support for applications which only append to files without introducing an https://httpd.apache.org/docs/1.3/logs.html API incompatibility. The web server's internal support for error and access log files only appends to the end of log files and does not use file offsets, so the modifications to APR allow large log files when using the internal web server support. The rotatelogs application interacts with log files in a more complex manner, including the use of file offsets. Thus, the APR changes don't http://publib.boulder.ibm.com/httpserv/ihsdiag/rotatelogs.html enable large file support in rotatelogs. For releases 7.0 and later, the bundled APR allows rotatelogs to use large file offsets. Note that since rotatelogs has a static copy of the APR library, rotatelogs from later releases can be used as a piped logger in previous releases. Shouldn't I see a new logfile exactly when my interval ends? Does rotatelogs rotate log files if no requests are received? No, the rotate operation will not occur until IHS logs another request. If your configuration specifies that rotatelogs performs the rotation operation after 86400 seconds, and if IHS receives no requests after 86400 seconds have elapsed, the new log file will not yet be created. Then, when rotatelogs receives its next request to log, it will create the new log file and close the old one. Does rotatelogs buffer data before writing to the log file? No. However, data may be buffered in the operating system kernel after the web server writes the data but before rotatelogs can read it. This time is usually very brief. Other programs can be used to filter data seen by rotatelogs, and those programs may introduce buffering. Example: CustomLog "|grep -v \b
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack http://serverfault.com/questions/153052/why-is-syslog-not-writing-logs-to-the-designated-files Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network https://www.feistyduck.com/library/apache-security/online/apachesc-CHP-8.html administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Why is Syslog apache log Not Writing Logs To The Designated Files? up vote 5 down vote favorite I've been trying to route Apache's logs through Syslog (for some reason log rotation had stopped, and using Syslog and logrotate seemed a reasonable solution). I have sent Apache's error logs to local7 and piped the access logs to local6 via the logger program. I want Syslog to write the error and access logs to /var/log/apache2/error.log and /var/log/apache2/access.log respectively. apache error writing To that end I have added the following to /etc/syslog.conf: # Logging for Apache using local7 facility for error messages # and local6 for access log # Added 20/06/2010 by Chris Bunney local7.* /var/log/apache2/error.log local6.* /var/log/apache2/access.log I know that the error and access logs are being sent to Syslog correctly because they are showing up in /var/log/syslog, however they are not being written to the files I want. The original file permissions of the target files: -rw-r----- 1 root adm 0 2010-06-20 23:01 access.log The current file permissions of the target files that I have been using to try and rule out such things causing issues: -rw-rw-rw- 1 syslog adm 0 2010-06-20 23:01 access.log Everything looks fine to me, so why aren't the messages Syslog is receiving being written to the files I want? Have I missed something simple? Full Output of cat /etc/syslog.conf: # /etc/syslog.conf Configuration file for syslogd. # # For more information see syslog.conf(5) # manpage. # # First some standard logfiles. Log by facility. # auth,authpriv.* /var/log/auth.log *.*;auth,authpriv.none -/var/log/syslog cron.* /var/log/cron.log daemon.* -/var/log/daemon.log kern.* -/var/log/kern.log lpr.* -/var/log/lpr.log mail.* -/var/log/mail.log user.* -/var/log/user.log # # Logging for the mail system. Split it up so that # it is easy to write scripts to parse these files. # mail.info -/var/log/mail.info mail.warn -/var/log/mail.warn mail.e
only way to know a system is secure (and behaving correctly) is through informative and trustworthy log files. Though the security point of view is almost all we care about, we have other reasons to have good logs, such as to perform traffic analysis (which is useful for marketing) or to charge customers for the use of resources (billing and accounting).Most administrators do not think about the logs much before an intrusion happens and only realize their configuration mistakes when it is discovered that critical forensic information is not available. In this chapter, we will cover the subjects of logging and monitoring, which are important to ensure the system records relevant information from a security perspective.This chapter covers the following:Apache logging facilitiesLog manipulationRemote loggingLogging strategiesLog forensicsMonitoringApache Logging FacilitiesApache can produce many types of logs. The two essential types are the access log, where all requests are noted, and the error log, which is designed to log various informational and debug messages, plus every exceptional event that occurs. Additional information can be found in module-specific logs, as is the case with mod_ssl, mod_rewrite and mod_security. The access log is created and written to by the module mod_log_config, which is not a part of the core, but this module is so important that everyone treats it as if it is.Request LoggingYou only need to be familiar with three configuration directives to manage request logging: LogFormat TransferLog CustomLog In fact, you will need to use only two. The CustomLog directive is so flexible and easy to use that you will rarely need to use TransferLog in your configuration. (It will become clear why later.)Other directives are available, but they are deprecated and should not be used because CustomLog can achieve all the necessary functionality. Some have been removed from Apache 2: CookieLog Deprecated, but still available AgentLog Depreca