Questions tagged [log]

A log is a record of events during a particular time range. Questions about interpreting logs on Ubuntu or controlling logging.

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72 votes
4 answers
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Very large log files, what should I do?

(This question deals with a similar issue, but it talks about a rotated log file.) Today I got a system message regarding very low /var space. As usual I executed the commands in the line of sudo ...
Masroor's user avatar
  • 3,143
42 votes
1 answer
165k views

[Firmware Bug]: TSC_DEADLINE disabled due to Errata - what should I do about this?

I saw several bugs and error messages when I was looking by chance into the tool called "logs". Being a newbie in Ubuntu I have no idea how to deal with these bugs, where to report them or how to fix ...
Nermeen Hussein's user avatar
1178 votes
16 answers
3.0m views

Where is the cron / crontab log?

I want to verify that my cron job is executing and at what time. I believe there is a log for my sudo crontab -e jobs, but where? I searched google and found recommendations to look in /var/log (...
Scott Szretter's user avatar
63 votes
4 answers
177k views

How do I log all input and output in a terminal session?

How do I keep logs of all the work done via terminal? For example, I want a record of all the work done on database via terminal.
Ankit's user avatar
  • 6,779
108 votes
3 answers
274k views

Where are all the major log files located?

So, if there is some problem with my computer, be it hardware or software, what are the major log files and where are they located? Also, is there a generic location where log files of the other ...
green's user avatar
  • 14.3k
7 votes
1 answer
21k views

16.04: How do I make cron create cron.log and monitor it in real time?

I know that cron events are stored in /var/log/syslog and I can use a command like: sudo cat /var/log/syslog | grep cron to see them. I'd much rather have the system keep a separate cron log file ...
SDsolar's user avatar
  • 3,169
140 votes
3 answers
278k views

How do I keep track of failed SSH log-in attempts?

I'd like to see if somebody has been trying to log-in by brute-force into my Ubuntu 12.04 server over SSH. How can I see if such activities have been taking place?
Ivan's user avatar
  • 57k
34 votes
2 answers
50k views

Where is the shutdown log?

I am trying to debug a hang during shutdown and I don't find where the messages that I see during shutdown are being stored. They aren't in /var/log/syslog
Óscar's user avatar
  • 1,006
182 votes
5 answers
360k views

How to see Login history?

Is it possible to see the login history, i mean to see if someone has used the computer in my absence and when he used it . if it is possible, where can i get the log ? if not, is there a program that ...
Dzero's user avatar
  • 3,178
99 votes
5 answers
421k views

How to see log to find a boot problem

I want to find the cause of a boot problem I have tried ls -ltr /var/log from antony@antony which gives me login incorrect can someone tell me what command to use to see what has upset the boot ...
Antony's user avatar
  • 1,383
30 votes
3 answers
31k views

No more boot logging since 16.04?

I noticed that my /var/log/boot.log file has date 2016-04-22, last time I booted in 15.10. Where are Xenial boot.log files located?
jasmines's user avatar
  • 11k
11 votes
4 answers
16k views

cupsd using 100% CPU, creating large (80GB+) error_log

A few days ago I realized my Ubuntu machine wouldn't load after login. After some digging around on a liveCD I realized my HDD was at 100% capacity, so I deleted some large files and was able to log ...
wndg's user avatar
  • 111
11 votes
1 answer
3k views

How do I get information from the logs on my computer when I only have access to the command line?

For various reasons I can no longer access my graphical desktop, and can only login via a tty (Ctrl+Alt+F1 through F6 by default). To help diagnose and solve my problem I need to look through the ...
Seth's user avatar
  • 58.1k
172 votes
11 answers
79k views

How can I tell what date Ubuntu was installed?

is there a command which will output the date that ubuntu (or any distribution) was installed?
lxtips's user avatar
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29 votes
2 answers
28k views

Can I look at the upgrade log after a distribution upgrade?

I've upgraded to Ubuntu 12.04 and did it offline using the alternative CD. I didn't look at the "packages to remove" section before clicking next - I've done Ubuntu upgrades many times and assumed it ...
Hamish Downer's user avatar
25 votes
7 answers
60k views

var/log/syslog growing indefinitely in size

The disk that contains Ubuntu on my computer is 115GB in size. When the disk was 114.7GBfull. I started deleting some files here and there to free up around 5GB. But I noticed the disk was 114GB ...
ant_1618's user avatar
  • 731
3 votes
1 answer
4k views

How to change cron log level?

I replaced exec cron with exec cron -L 15 the run sudo service cron reload, sudo service cron restart but nothing changed. Cron doesn't log the end of jobs and doesn't log failed jobs. I hade no ...
max5555's user avatar
  • 317
81 votes
5 answers
365k views

Where can I find the iptables log file, and how can I change its location?

I have this rule in my iptables: iptables -A INPUT -s 192.168.11.0/24 -j LOG My question is: Where is the iptables log file, and how can I change that?
pylover's user avatar
  • 2,325
51 votes
3 answers
99k views

Ubuntu freezes. Which logs can I check out?

So my computer has lately started freezing completely when I run some programs that, in the past, would work great. What I am unsure about however, is what logs that are available to me that could ...
Industrial's user avatar
  • 1,698
43 votes
7 answers
53k views

GUI for watching logs (tail and grep)

Could you recommend a GUI application with powerful log watching capabilities? Generally it would work as tail -f in GUI, but on top of that following features would be very useful: filtering out ...
Grzegorz Oledzki's user avatar
6 votes
3 answers
13k views

How to prevent logs from getting too big?

I have a cronjob that runs some Python scripts and they generate massive log file. How do I prevent them from getting so big? It'd be perfect if the file was deleted once it hit a certain size. ...
User's user avatar
  • 161
5 votes
2 answers
3k views

Investigating a system "freeze"

Am on Ubuntu 10.04.2 LTS Linux skiran 2.6.32-32-generic-pae #62-Ubuntu SMP Wed Apr 20 22:10:33 UTC 2011 i686 GNU/Linux My machine froze for the 5th time in 2 days. Had to reboot, and login to a ...
Kiran Subbaraman's user avatar
59 votes
5 answers
90k views

Where is log file from rc.local?

I have some commands to in my rc.local. I know that they are failing. How can I get log file with messages produced by executing rc.local? Where is it located? I have checked the /var/log/boot.log. I ...
vladimir's user avatar
  • 1,517
45 votes
5 answers
179k views

Can I delete /var/log files due to low root space?

Just had the message: Low disk space.. 2 GB left Judging by a posted message on ubuntu.org forums, I found that I have a .log file in /var/log at 22 GB in size! My root is an 82 GB partition and ...
Paul B's user avatar
  • 755
33 votes
5 answers
65k views

How do I check if last shutdown was clean?

How can tell that my last shutdown was properly done in Ubuntu 11.10 or if the machine was powered off before shutting down the OS?
Vikramjeet's user avatar
  • 5,566
31 votes
5 answers
28k views

Displaying a "scrolling" log file

Via command line, I have a log file I'd like to keep track of. What I want is to have, basically, a tail that refreshes when the log is updated making the text scroll upwards as new lines are ...
WernerCD's user avatar
  • 632
14 votes
3 answers
3k views

How can I read NotifyOSD messages after they are displayed?

I'd like to read a list of messages displayed by notify-osd from time to time. I'm using 12.04 still, if it matters. Is this possible? These two questions from 2010 indicate that a log file should ...
Tom Brossman's user avatar
  • 13.1k
12 votes
4 answers
43k views

Log SSH activity

All, I have an Ubuntu host that accepts SSH connections. How can I log all commands that are run on a specific account that logs in via SSH? Thanks
Lexicon's user avatar
  • 339
44 votes
8 answers
190k views

Where is the VLC logfile for errors?

I tried to open a blu ray with VLC, but I got this error message: VLC is unable to open the MRL 'bluray:///dev/sr0'. Check the log for details. For further information I have to read a log from ...
sharkant's user avatar
  • 1,311
41 votes
2 answers
191k views

Where is Xserver log file located?

My Ubuntu 10.10 sometimes totally freezes. I suppose that it is somehow related to my graphic card and would like to check Xserver log. Where is this file located ?
tommyk's user avatar
  • 4,466
39 votes
4 answers
143k views

Where are kernel panic logs?

I've got problem with Handbrake/ffmpeg. After ~5 minutes transcoding, the computer locks up. I'm fairly sure it's a kernel panic because caps-lock starts flashing. There are a few logical questions ...
Oli's user avatar
  • 293k
23 votes
2 answers
51k views

Does Ubuntu log when USB devices are connected?

When I connect a USB drive to an Ubuntu OS, would there be a text file which contains details of that connection and if so, where is that file located ? What is the name of that file?
Neil's user avatar
  • 243
21 votes
2 answers
74k views

How to view results of last clamscan scan?

I scanned pen drive using clamscan and I closed the terminal after scanning without reading the result. Now one of my folders on the pen drive is missing. I wanted to know if clamav deleted it. So ...
Abhijit Navale's user avatar
19 votes
3 answers
17k views

How can I know when my screen was locked last time?

Exist a log where I can look for that information? I want to know last days when my PC automatically locked the screen because was idle.
user avatar
15 votes
3 answers
59k views

Where can I find the boot log?

When I boot up Ubuntu and I don't have the graphical boot screen (Plymouth) enabled I see a bunch of text saying if an action was [OK] or it [FAILED]. Since this process is a bit quick I can't fully ...
xuwenbuwer's user avatar
14 votes
1 answer
8k views

How can I log all notify-send actions?

I keep getting very strange notifications which go away before I can read them, they are long, and appear at random times, the most recently one came up was during a kernel upgrade, it had a strange ...
user avatar
14 votes
3 answers
19k views

How do I diagnose Hang on Shutdown?

Since one or two months ago, my laptop with ubuntu 12.10x64 hangs during shutdown. There's just a black screen, no harddisk activity, it justs sits there. I feel it happens near the end of a normal ...
Christoph's user avatar
  • 3,108
14 votes
3 answers
3k views

Is there software which time- tracks window & application usage?

Is there a software which keeps time of my activities and gives a report? Based on focused window and window title. Report would just show time spent for specific window and its title like: ...
ambi's user avatar
  • 183
8 votes
3 answers
10k views

Why is ufw logging 'BLOCK' messages regarding a port for which ufw is configured to 'ALLOW' connections?

Here's an example log message: May 25 10:36:07 myserver kernel: [7057243.392334] [UFW BLOCK] IN=eth0 OUT= MAC=00:02:55:67:82:eb:00:06:b1:3a:ef:62:08:00 SRC=69.197.128.26 DST=192.168.100.101 LEN=44 ...
Chris W.'s user avatar
  • 251
1 vote
1 answer
5k views

When was my kernel updated and installed

This question is related to Avoid missing kernel linux-modules-extra-XX-generic when updating kernel The process of updating the kernel takes several steps. My questions are: Among all possible ways ...
sancho.s ReinstateMonicaCellio's user avatar
298 votes
5 answers
1.1m views

Where are the Apache and PHP log files?

I've installed Apache, PHP, and MySQL on Ubuntu 10.10 desktop edition, and it's working fine. Except I have no clue where to look for Apache or PHP log files.
Stann's user avatar
  • 15.1k
132 votes
6 answers
734k views

Where are the OpenVPN connection logs and configuration files?

I have problem connecting to OpenVPN server. Where are OpenVPN log files and how do I find the connection details?
Hojat Taheri's user avatar
  • 5,409
47 votes
2 answers
95k views

Where are network manager logs? (16.04)

I have new Ubuntu and I want to debug some errors in network settings. I cannot find log for NetworkManager. /var/log/syslog and /var/log/daemon.log - what people recommend on this stack exchange in ...
Karel Bílek's user avatar
  • 2,474
46 votes
4 answers
112k views

How can I track the cause of random reboots?

A Thinkpad X220 (Core-i5, SandyBridge, Intel GMA) running Precise 64-bit has rebooted hard twice in the last four days. I was doing nothing more than writing an email. No warning. It just went black, ...
Andre's user avatar
  • 2,061
37 votes
4 answers
106k views

Where are the NetworkManager logs?

A previous poster on the regular forums ( http://ubuntuforums.org/showthread.php?t=843991 ) said /var/log/daemon.log, but I don't seem to have such a file. Do I need to enable logging?
gatoatigrado's user avatar
  • 1,803
37 votes
2 answers
113k views

Why I'm getting this [UFW BLOCK] in my syslogs?

I wonder why I get this error on my syslogs: [7732763.396193] [UFW BLOCK] IN=eth0 OUT= MAC=02:8b:1a:75:d5:7b:02:8b:1a:40:00:03:08:00 SRC=x.x.x.x DST=x.x.x.x LEN=40 TOS=0x00 PREC=0x00 TTL=64 ID=53703 ...
batman's user avatar
  • 7,961
30 votes
2 answers
128k views

Where does Ubuntu 14.04 log SSH access attempts? [duplicate]

Trying to find out why fail2ban is not working. Where does Ubuntu 14.04 log SSH access attempts?
timbram's user avatar
  • 1,995
28 votes
5 answers
23k views

Redirect UFW logs to own file?

Is there a way I can easily redirect the entries for UFW to their own log file at /var/log/ufw instead of filling up /var/log/syslog as it's becoming tricky to find solutions to problems with all this ...
markrich's user avatar
  • 1,400
24 votes
5 answers
64k views

How to truncate all logfiles?

can anybody give me a solution to truncate all logfile in /var/log/ directory? and a question just for knowledge, is it a good idea or not? #!/bin/bash LOGDIR="/var/log" for logfile in $(ls $LOGDIR/*...
pylover's user avatar
  • 2,325
24 votes
6 answers
61k views

When an application crash without output an error, is there a log that i can check?

Sometimes it happen that some application crash without give no output error (conky in my case, probably is one of my configuration that is incorrect). Is there somewhere a error log that I can check ...
Strae's user avatar
  • 1,960