How To Check Error Logs In Linux
Contents |
Introduction Target Audience System Logs Authorization Log Daemon Log Debug Log Kernel Log Kernel Ring Buffer System Log Application Logs Apache HTTP Server
How To Check Logs In Linux Server
Logs CUPS Print System Logs Rootkit Hunter Log Samba SMB linux /var/log/messages Server Logs X11 Server Log Non-Human-Readable Logs Login Failures Log Last Logins Log Login Records Log
Linux Log Files Explained
System Logging Daemon (syslogd) Configuration of syslogd Echoing Messages to syslogd With Logger Log Rotation Essential Commands Getting Started Editing Files Viewing Files Viewing the Beginning of how to view logs in linux command line 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 system is that virtually anything and everything happening on and to the system may be logged in some manner. This information is invaluable for what is /var/log/messages 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 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
Computing Tutorials Open Source Pro LearnWhat is Linux? Training Certification Events Webinars CommunityParticipate
Linux Log Command
Q&A Forums Blogs ResourcesNewsletter Distributions Publications Infographics Photos Videos how to view log files in linux Jobs elsisi February 16, 2015 Command To Check Error Logs In SSH Forums:Command Line
How To Check Log Files In Unix
Hello i'am trying to instal a script on my site , but i have an error " Internal Server Error " and i don't https://help.ubuntu.com/community/LinuxLogFiles 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 https://www.linux.com/forums/command-line/command-check-error-logs-ssh 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 LFD450 Embedded Linux Development October 24, 2016 Learn more LFS462 Linux KVM Virtualization October 24, 2016 Learn more LFD430 Developing Linux Device Drivers 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
know where the log files are located, and what is contained in each and every log file. When your systems are running smoothly, take some http://www.thegeekstuff.com/2011/08/linux-var-log-files time to learn and understand the content of various log files, which will help https://www.digitalocean.com/community/tutorials/how-to-view-and-configure-linux-logs-on-ubuntu-and-centos you when there is a crisis and you have to look though the log files to identify the issue. /etc/rsyslog.conf controls what goes inside some of the log files. For example, following is the entry in rsyslog.conf for /var/log/messages. $ grep "/var/log/messages" /etc/rsyslog.conf *.info;mail.none;authpriv.none;cron.none /var/log/messages In the above output, *.info indicates that all how to logs with type INFO will be logged. mail.none,authpriv.none,cron.none indicates that those error messages should not be logged into the /var/log/messages file. You can also specify *.none, which indicates that none of the log messages will be logged. The following are the 20 different log files that are located under /var/log/ directory. Some of these log files are distribution specific. For example, you'll see dpkg.log on Debian how to check based systems (for example, on Ubuntu). /var/log/messages - Contains global system messages, including the messages that are logged during system startup. There are several things that are logged in /var/log/messages including mail, cron, daemon, kern, auth, etc. /var/log/dmesg - Contains kernel ring buffer information. When the system boots up, it prints number of messages on the screen that displays information about the hardware devices that the kernel detects during boot process. These messages are available in kernel ring buffer and whenever the new message comes the old message gets overwritten. You can also view the content of this file using the dmesg command. /var/log/auth.log - Contains system authorization information, including user logins and authentication machinsm that were used. /var/log/boot.log - Contains information that are logged when the system boots /var/log/daemon.log - Contains information logged by the various background daemons that runs on the system /var/log/dpkg.log - Contains information that are logged when a package is installed or removed using dpkg command /var/log/kern.log - Contains information logged by the kernel. Helpful for you to troubleshoot a custom-built kernel. /var/log/lastlog - Displays the recent login information for all the users. This is not an ascii file. You should use lastlog
In submit Tutorials Questions Projects Meetups Main Site logo-horizontal DigitalOcean Community Menu Tutorials Questions Projects Meetups Main Site Sign Up Log In submit View All Results By: Sadequl Hussain Subscribe 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 165.3k 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 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 Nov 15