Linux Error Log Command
Contents |
Introduction 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 how to view logs in linux command line Log Non-Human-Readable Logs Login Failures Log Last Logins Log Login Records Log System Logging
How To Check Logs In Linux Server
Daemon (syslogd) Configuration of syslogd Echoing Messages to syslogd With Logger Log Rotation Essential Commands Getting Started Editing Files Viewing linux /var/log/messages 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 linux log files explained 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
Linux Log Command
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 Authori
and Logs Linux maintains several system logs that help you administer a Linux system by informing you of important events. Probably what is /var/log/messages the most important log is the file /var/log/messages, which records a how to check log files in unix variety of events, including system error messages, system startups, and system shutdowns. Like most other Linux
/var/log/syslog
files, the file contains ASCII text, so you can view it with a text editor or the text processing commands described in Chapter 13. A special command, https://help.ubuntu.com/community/LinuxLogFiles dmesg, makes it easy to view the log messages related to the most recent system startup. If your system is behaving unusually, use dmesg to quickly see if something went wrong during the system startup sequence. Of course, you must have some way of determining what's usual and unusual among the many messages emitted during http://www.oreilly.com/openbook/debian/book/ch07_04.html system startup. The best way to do so is to print the output of the dmesg command and keep it on hand for comparison with suspicious output. If your system has an attached printer, you can print the output of dmesg by entering the following command: dmesg | lpr Other logs found in the /var/log directory include: apache A directory that contains two log files pertaining to the Apache web server, access.log and error.log. exim A directory that contains several log files pertaining to the exim mail transfer agent. nmb and smb Files that contain log entries pertaining to Samba, the Microsoft-compatible networking server. ppp.log A file the contains log entries pertaining to PPP. 7.3 Starting and Stopping the System and Services 7.5 Setting the System Time and Time Zone Back to: Learning Debian GNU/Linux oreilly.com Home | O'Reilly Bookstores | How to Order | O'Reilly Contacts International | About O'Reilly | Affiliated Companies | Privacy Policy © 2001, O'Reilly & Associates, Inc.
In submit Tutorials Questions Projects Meetups Main Site logo-horizontal DigitalOcean Community Menu Tutorials Questions Projects Meetups Main Site Sign https://www.digitalocean.com/community/tutorials/how-to-view-and-configure-linux-logs-on-ubuntu-and-centos Up Log In submit View All Results By: Sadequl Hussain Subscribe https://www.linux.com/forums/command-line/command-check-error-logs-ssh Subscribed Share Contents Contents We hope you find this tutorial helpful. In addition to guides like this one, we provide simple cloud infrastructure for developers. Learn more → 9 How To View and Configure Linux Logs on Ubuntu and Centos Posted Dec 17, 2013 166.4k how to views Logging Linux Basics CentOS Ubuntu Debian Introduction Linux system administrators often need to look at log files for troubleshooting purposes. In fact, this is the first thing any sysadmin would do. Linux and the applications that run on it can generate all different types of messages, which are recorded in various log files. Linux uses a logs in linux set of configuration files, directories, programs, commands and daemons to create, store and recycle these log messages. Knowing where the system keeps its log files and how to make use of related commands can therefore help save valuable time during troubleshooting. In this tutorial, we will have a look at different parts of the Linux logging mechanism. Disclaimer The commands in this tutorial were tested in plain vanilla installations of CentOS 6.4, Ubuntu 12 and Debian 7. Default Log File Location The default location for log files in Linux is /var/log. You can view the list of log files in this directory with a simple ls -l /var/log command. This is what I see in my CentOS system: [root@TestLinux ~]# ls -l /var/log total 1472 -rw-------. 1 root root 4524 Nov 15 16:04 anaconda.ifcfg.log -rw-------. 1 root root 59041 Nov 15 16:04 anaconda.log -rw-------. 1 root root 42763 Nov 15 16:04 anaconda.program.log -rw-------. 1 root root 299910 Nov 15 16:04 anaconda.storage.log -rw-------. 1 root root 40669
Computing Tutorials Open Source Pro LearnWhat is Linux? Training Certification Events Webinars CommunityParticipate Q&A Forums Blogs ResourcesNewsletter Distributions Publications Infographics Photos Videos Jobs elsisi February 16, 2015 Command To Check Error Logs In SSH Forums:Command Line Hello i'am trying to instal a script on my site , but i have an error " Internal Server Error " and i don't know what is this so,what's Command To Check Error Logs In SSH for specific user ? i'll usr root to accese , and want to know error logs for a user on my server what's Command To Check Error Logs please ? Print This Log in or register to post comments Like (0 likes) 1 Comments Comments RecommendedDate March 1, 2015 #2 matugm If you are using Apache then try tail -f /var/log/apache2/error.log Top Log in or register to post comments Like Leave this field blank Click Here! Advertisement Training See all LFS301 Linux System Administration October 31, 2016 Learn more LFD430 Developing Linux Device Drivers October 31, 2016 Learn more LFS311 Advanced Linux System Administration and Networking October 31, 2016 Learn more Newsletter NewsEnterprise Desktop Mobile & Embedded Open Source Linux Kernel DevOps Networking Cloud Computing Tutorials Open Source Pro LearnWhat is Linux? Training Certification Events Webinars CommunityParticipate Q&A Forums Blogs ResourcesNewsletter Distributions Publications Infographics Photos Videos Jobs About Linux.comTerms of Use Privacy Policy Editorial Policy Contact The Linux Foundation is a non-profit consortium enabling collaboration and innovation through an open source development model. Learn More © 2016 The Linux Foundation