Linux Error Log File
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2014 in Commands, File system, LinuxI am linux log files explained a new Linux user. I would like to know
Linux Var/log/messages
where are the log files located under Debian/Ubuntu or CentOS/RHEL/Fedora Linux server? How how to check logs in linux server do I open or view log files on Linux operating systems? Almost all logfiles are located under /var/log directory and its how to view logs in linux command line sub-directories on Linux. You can change to this directory using the cd command. You need be the root user to view or access log files on Linux or Unix like operating systems. You can use the following commands to see the log
Linux Log Command
files:less commandmore commandcat commandgrep commandtail commandzcat commandzgrep commandzmore commandHow do I view log files on Linux?Open the Terminal or login as root user using ssh command. Go to /var/log directory using the following cd command: # cd /var/log
To list files use the following ls command: # ls Sample outputs from RHEL 6.x server:anaconda.ifcfg.log boot.log-20111225 cron-20131110.gz maillog-20111218 messages-20131103.gz secure-20131027.gz spooler-20131117.gz up2date-20131117.gz anaconda.log btmp cron-20131117.gz maillog-20111225 messages-20131110.gz secure-20131103.gz squid uptrack.log anaconda.program.log btmp-20120101 cups maillog-20120101 messages-20131117.gz secure-20131110.gz swinstall.d uptrack.log.1 anaconda.storage.log btmp-20131101.gz dkms_autoinstaller maillog-20131027.gz mysqld.log secure-20131117.gz tallylog uptrack.log.2 anaconda.syslog collectl dmesg maillog-20131103.gz ntpstats setroubleshoot UcliEvt.log varnish anaconda.yum.log ConsoleKit dmesg.old maillog-20131110.gz prelink spooler up2date wtmp arcconfig.xml cron dracut.log maillog-20131117.gz rhsm spooler-20111211 up2date-20111211 yum.log atop cron-20111211 dracut.log-20120101 messages sa spooler-20111218 up2date-20111218 yum.log-20120101 audit cron-20111218 dracut.log-20130101.gz messages-20111211 secure spooler-20111225 up2date-20111225 yum.log-20130101.gz boot.logIntroduction Target Audience System Logs Authorization Log Daemon Log Debug Log Kernel Log Kernel Ring Buffer System Log Application Logs Apache HTTP Server Logs CUPS Print System Logs Rootkit Hunter Log Samba SMB Server Logs X11 Server what is /var/log/messages Log Non-Human-Readable Logs Login Failures Log Last Logins Log Login Records Log System Logging /var/log/syslog Daemon (syslogd) Configuration of syslogd Echoing Messages to syslogd With Logger Log Rotation Essential Commands Getting Started Editing Files Viewing
Ubuntu System Log
Files Viewing the Beginning of Files Viewing the End of Files Watching a Changing File Searching Files Resources Local System Resources WWW Resources Introduction One of the things which makes GNU/Linux a great operating http://www.cyberciti.biz/faq/linux-log-files-location-and-how-do-i-view-logs-files/ system is that virtually anything and everything happening on and to the system may be logged in some manner. This information is invaluable for using the system in an informed manner, and should be one of the first resources you use to trouble-shoot system and application issues. The logs can tell you almost anything you need to know, as long as you have an idea where to https://help.ubuntu.com/community/LinuxLogFiles look first. Your Ubuntu system provides vital information using various system log files. These log files are typically plain ASCII text in a standard log file format, and most of them sit in the traditional system log subdirectory /var/log. Many are generated by the system log daemon, syslogd on behalf of the system and certain applications, while some applications generate their own logs by writing directly to files in /var/log. This guide talks about how to read and use several of these system log files, how to use and configure the system logging daemon, syslogd, and how log rotation works. See the Resources section for additional information. Target Audience This guide will be simple enough to use if you have any experience using the console and editing text files using a text editor. See the end of this document for some essential commands that may help you find your way around these files if you're relatively new to the command line. System Logs System logs deal primarily with the functioning of the Ubuntu system, not necessarily with additional applications added by users. Examples include authorization mechanisms, system daemons, system messages, and the all-encompassing system log itself, syslog. Authorization Log The Authorizatio
kernel, services, and applications running on it. There are different log files for different information. For https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/3/html/System_Administration_Guide/ch-logfiles.html example, there is a default system log file, a log file just for security messages, and a log file for cron tasks.
Log https://www.digitalocean.com/community/tutorials/how-to-view-and-configure-linux-logs-on-ubuntu-and-centos files can be very useful when trying to troubleshoot a problem with the system such as trying to load a kernel driver or when looking for log file unauthorized log in attempts to the system. This chapter discusses where to find log files, how to view log files, and what to look for in log files. Some log files are controlled by a daemon called syslogd. A list of log messages maintained by syslogd can logs in linux be found in the /etc/syslog.conf configuration file. 38.1. Locating Log Files Most log files are located in the /var/log/ directory. Some applications such as httpd and samba have a directory within /var/log/ for their log files. Notice the multiple files in the log file directory with numbers after them. These are created when the log files are rotated. Log files are rotated so their file sizes do not become too large. The logrotate package contains a cron task that automatically rotates log files according to the /etc/logrotate.conf configuration file and the configuration files in the /etc/logrotate.d/ directory. By default, it is configured to rotate every week and keep four weeks worth of previous log files.