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  • HTG Explains: Why You Shouldn’t Log Into Your Linux System As Root

    - by Chris Hoffman
    On Linux, the Root user is equivalent to the Administrator user on Windows. However, while Windows has long had a culture of average users logging in as Administrator, you shouldn’t log in as root on Linux. Microsoft tried to improve Windows security practices with UAC – you shouldn’t log in as root on Linux for the same reason you shouldn’t disable UAC on Windows. How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • An XEvent a Day (23 of 31) – How it Works – Multiple Transaction Log Files

    - by Jonathan Kehayias
    While working on yesterday’s blog post The Future – fn_dblog() No More? Tracking Transaction Log Activity in Denali I did a quick Google search to find a specific blog post by Paul Randal to use it as a reference, and in the results returned another blog post titled, Investigating Multiple Transaction Log Files in SQL Server caught my eye so I opened it in a new tab in IE and went about finishing the blog post.  It probably wouldn’t have gotten my attention if it hadn’t been on the SqlServerPedia...(read more)

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  • Log Growing Pains

    Understanding the transaction log seems to be a very difficult concept fro mos DBAs to grasp. Jason Brimhall brings us a new article that helps to troubleshoot the cause of log growths.

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  • Free eBook - Control Your Transaction Log so it Doesn't Control You

    Download your free copy of SQL Server Transaction Log Management and see why understanding how log files work can make all the difference in a crisis. Want to work faster with SQL Server?If you want to work faster try out the SQL Toolbelt. "The SQL Toolbelt provides tools that database developers as well as DBAs should not live without." William Van Orden. Download the SQL Toolbelt here.

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  • Scanning the Error Log with PowerShell

    - by AllenMWhite
    One of the most important things you can do as a DBA is to keep tabs on the errors reported in the error log, but there's a lot of information there and sometimes it's hard to find the 'good stuff'. You can open the errorlog file directly in a text editor and search for errors but that gets tedious, and string searches generally return just the lines with the error message numbers, and in the error log the real information you want is in the line after that. PowerShell 2.0 introduced a new cmdlet...(read more)

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  • Could not log-in properly but shows no error in joomla

    - by saeha
    I added some fields in the user registration in joomla including the image field which is blob type, all data is saving properly and i could also display the image but I could not log-in properly using the account with an uploaded image in the database and shows no error. And when I log-in as administrator in the backend, i saw this account as logged in. Any idea if what causes this problem? please help? Thank you.

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  • Free eBook: SQL Server Transaction Log Management

    When a SQL Server database is operating smoothly and performing well, there is no need to be particularly aware of the transaction log, beyond ensuring that every database has an appropriate backup regime and restore plan in place. When things go wrong, however, a DBA's reputation depends on a deeper understanding of the transaction log, both what it does, and how it works. Get to grips with SQL Server replicationIn this new eBook Sebastian Meine gives a hands-on introduction to SQL Server replication, including implementation and security. Download free ebook now.

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  • nginx logrotate config

    - by TomOP
    Whats the best way to rotate nginx logfiles? In my opinion, I should create a file "nginx" in /etc/logrotate.d/ and fill it with the following code and do a /etc/init.d/syslog restart after that. This would be my config (I havn't tested it yet): /usr/local/nginx/logs/*.log { #rotate the logfile(s) daily daily # adds extension like YYYYMMDD instead of simply adding a number dateext # If log file is missing, go on to next one without issuing an error msg missingok # Save logfiles for the last 49 days rotate 49 # Old versions of log files are compressed with gzip compress # Postpone compression of the previous log file to the next rotation cycle delaycompress # Do not rotate the log if it is empty notifempty # create mode owner group create 644 nginx nginx #after logfile is rotated and nginx.pid exists, send the USR1 signal postrotate [ ! -f /usr/local/nginx/logs/nginx.pid ] || kill -USR1 `cat /usr/local/nginx/logs/nginx.pid` endscript } I have both the access.log and error.log files in /usr/local/nginx/logs/ and want to rotate both daily. Can anyone please tell me if "dateext" is correct? I want the log filename to be something like "access.log-2010-12-04". One more thing: Can I do the log rotation every day on a specific time (e.g. 11 pm)? If so, how? Thanks.

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  • "watching" a log on FreeBSD vs Linux

    - by Cory J
    On Linux systems I can watch -n1 tail /var/log/whatever.log or watch -n1 grep somestuff /var/log/whatever.log To show updates to a log every 1 seconds. On FreeBSD however, the watch command does something else entirely. Who knows a good FreeBSD command for what I'm trying to do? =)

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  • assign user and group to site log files

    - by Francis
    When in a site apache conf file, is there a way to set the user and group for the CustomLog and ErrorLog? Right now, these 2 records create the error and access log with root:root permissions, but I would like them to be flewis:admin CustomLog /var/log/httpd/domain.com-access.log combined ErrorLog /var/log/httpd/domain.com-error.log If I change the user:group of the files, when the logs rotate, the new logs are root:root

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  • Scalable / Parallel Large Graph Analysis Library?

    - by Joel Hoff
    I am looking for good recommendations for scalable and/or parallel large graph analysis libraries in various languages. The problems I am working on involve significant computational analysis of graphs/networks with 1-100 million nodes and 10 million to 1+ billion edges. The largest SMP computer I am using has 256 GB memory, but I also have access to an HPC cluster with 1000 cores, 2 TB aggregate memory, and MPI for communication. I am primarily looking for scalable, high-performance graph libraries that could be used in either single or multi-threaded scenarios, but parallel analysis libraries based on MPI or a similar protocol for communication and/or distributed memory are also of interest for high-end problems. Target programming languages include C++, C, Java, and Python. My research to-date has come up with the following possible solutions for these languages: C++ -- The most viable solutions appear to be the Boost Graph Library and Parallel Boost Graph Library. I have looked briefly at MTGL, but it is currently slanted more toward massively multithreaded hardware architectures like the Cray XMT. C - igraph and SNAP (Small-world Network Analysis and Partitioning); latter uses OpenMP for parallelism on SMP systems. Java - I have found no parallel libraries here yet, but JGraphT and perhaps JUNG are leading contenders in the non-parallel space. Python - igraph and NetworkX look like the most solid options, though neither is parallel. There used to be Python bindings for BGL, but these are now unsupported; last release in 2005 looks stale now. Other topics here on SO that I've looked at have discussed graph libraries in C++, Java, Python, and other languages. However, none of these topics focused significantly on scalability. Does anyone have recommendations they can offer based on experience with any of the above or other library packages when applied to large graph analysis problems? Performance, scalability, and code stability/maturity are my primary concerns. Most of the specialized algorithms will be developed by my team with the exception of any graph-oriented parallel communication or distributed memory frameworks (where the graph state is distributed across a cluster).

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  • LaTex: why partially showing up references?

    - by HH
    The bib.style part may be the problem. If I do not reference to references, do they show up? I have listed all errors below, the file compiles so I don't know whether they are related to partially-showing-up-references. For example, work with many authors gets only one author listed. I want to see references fully, not partially. Headers $ grep bib header.tex \usepackage{natbib} \bibliographystyle{abbrvnat} Errors $ grep -n -A 7 -B 7 Error *.log combined.log-505-! Illegal unit of measure (pt inserted). combined.log-506-<to be read again> combined.log-507- \futurelet combined.log-508-l.353 \hline combined.log-509- combined.log-510-? combined.log-511- combined.log:512:! Package caption Error: cite undefined. combined.log-513- combined.log-514-See the caption package documentation for explanation. combined.log-515-Type H <return> for immediate help. combined.log-516- ... combined.log-517- combined.log-518-l.374 ...n={CPU O(mlog(n))}, cite={topcoder:node}] combined.log-519- -- combined.log-559- [] combined.log-560- combined.log-561-) [10] combined.log-562-\openout2 = `references.aux'. combined.log-563- combined.log-564- (./references.tex combined.log-565- combined.log:566:! LaTeX Error: \include cannot be nested. combined.log-567- combined.log-568-See the LaTeX manual or LaTeX Companion for explanation. combined.log-569-Type H <return> for immediate help. combined.log-570- ... combined.log-571- combined.log-572-l.1 \include{timeUse.tex} Bibs.bib @misc{ Gundersen, author = "G. Gundersen", title = "Data Structures in Java for Matrix Computations", year = "2002" } @book{ Lennart, author = "R. Lennart", title = "Mathematics Handbook for Science and Engineering BETA", year = "2004" }

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  • Shader compile log depending on hardware

    - by dreta
    I'm done with the core of my graphics engine and I'm testing it on every platform I can get my hands on. Now, what I noticed is that different drivers return different shader and program compile log content. For example, on my friend's laptop if you successfuly compile a shader then the log is simply empty. However on my PC I get some useful information along with it. So if I compile a vertex shader, I'll get: Vertex shader was successfully compiled to run on hardware. Which isn't that impressive, but is what happens when I compile a program. On my friend's computer the log is empty, since the program compiles. However on my own computer I get: Vertex shader(s) linked, fragment shader(s) linked. Which is awesome, because I'm attaching a geometry shader with 0 (I have a geometry shader file with trash, so it doesn't compile and the pointer is set to 0), and the compiler just tells me which shaders linked. Now it got me thinking, if I was going to buy a graphics card, is there a way for me to get the information about whether or not I'll get this "extended" compile information? Maybe it's vendor specific? Now I don't expect an answer TBH, this seems a bit obscure, but maybe somebody has any experience with this and could post it.

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  • An old flaw in X Window System. How does it work?

    - by Legend
    I was going through an article today when it mentioned the following: "We've found many errors over the years. One of the absolute best was the following in the X Window System: if(getuid() != 0 && geteuid == 0) { ErrorF("Only root"); exit(1); } It allowed any local user to get root access. (The tautological check geteuid == 0 was intended to be geteuid() == 0. In its current form, it compress the address of geteuid to 0; given that the function exists, its address is never 0)." The article explained what was wrong with the code but I would like to know what it means to say that "It allowed any local user to get root access". I am not an expert in C but can someone give me an exact context in which this exploit would work? Specifically, what I mean is, lets say I am the local user, how would I get root access if we assume this code to be present somewhere?

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  • Can't log-in anymore

    - by Awake Zoldiek
    I installed Ubuntu x64 12.04 Desktop LTS on my new laptop three days ago. Of course when I installed it I did an "apt-get upgrade" and a "apt-get update". I modified the .bashrc file to add some aliases but that's about it. Everything went fine I think, but this morning when I tried to connect to my user account, it just simply didn't work. Even when I give the right password, it will send me to a black screen with a few text lines written in white for a second and then back to the log-in screen. When I logged into the guest session, I couldn't shutdown / restart. I tried the "rm /home/MyUsername/.Xauthority" solution after doing a Ctrl + Alt + F1 at the log-in screen. But that didn't work. Does anyone has an idea ? My Ubuntu seems to use Gnome. Thank you a lot in advance ! This question is similar to this one, but their solution didn't help : -- after 12.04 upgrade: can't log in although password is correct

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  • Can't Log Into Ubuntu 12.04

    - by Razick
    Yesterday, after turning on Ubuntu, I logged into a Gnome session. A few minutes later, I tried switching to Unity for a change. Unfortunately, the background and my desktop icons loaded, but the system bar and launcher failed to load even after several minutes. Unity had always worked fine for me. I then tried the guest account, and it worked fine on both Unity and Gnome. However, the problem with my account got worse; I couldn't log into any desktop at all anymore. I would type in my password and press enter and it would just sit there doing nothing. The computer no longer responded in any way, so I had to hold the power button and reboot. The same problem happened repeatedly. Earlier today, I tried to get on again. I found that I hadthe same problem, when I tried to log in, the computer no longer locked up, but instead flashed a black screen with theconsole output and what seemed to be an error message before returning to the log in screen. It was to quick for me to read, about 1/4-1/2 second. I'd really appreciate some help as I have some important files that are not backed up yet. I can't transfer the files to a new account, or even make a new account because I tried taking the password off my account so now I can't authenticate from the guest to perform root functions. I'd really appreciate some help as I have some important files that are not backed up yet. Thanks.

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  • "Unable to open MRTG log file" error with nagios and mrtg

    - by Simone Magnaschi
    We have a strange issue with our setup of icinga / nagios and mrtg. Icinga is working great and has no problem, it can monitor basically everything without issues. We setup mrtg to gather bandwith data from our routers and switches. MRTG is working fine: it stores the log data in the /var/www/mrtg/ directory and displays the graph data via web. We assume so MRTG is doing great. We tried to setup bandwidth checks in nagios: define service{ use generic-service ; Inherit values from a template host_name zywall-agora service_description ZYWALL AGORA TRAFFICO check_command check_local_mrtgtraf!/var/www/mrtg/x.x.x.x_2.log!AVG!1000000,2000000!5000000,5000000!1000 check_interval 1 ; Check the service every 1 minute under normal conditions retry_interval 1 ; Re-check every minute until its final/hard state is determined } Where /var/www/mrtg/x.x.x.x_2.log is the correct log path file. We keep on getting Unable to open MRTG log file error in the test result in icinga web interface. We tried everything: give ownership to user nagios or icinga to the log file give chmod 777 to the file try to copy the file in another directory and give it full permission Same error. The strange thing is that if we use the command that nagios generate in a bash session the command works like a charm: /usr/lib64/nagios/plugins/check_mrtgtraf -F /var/www/mrtg/x.x.x.x_2.log -a AVG -w 10,20 -c 5000000,5000000 -e 10 Result: Traffic WARNING - Avg. In = 17.9 KB/s, Avg. Out = 5.0 KB/s|in=17.877930KB/s;10.000000;5000000.000000;0.000000 out=5.000000KB/s;20.000000;5000000.000000;0.000000 We ran that command line as root, as user nagios and as user icinga and all three worked ok. We thought that the command that nagios perform maybe has something wrong in it, so we debugged nagios but we found out that the generated command from nagios is the same as above. Searching on google for these kind of problem returns only issues of systems where mrtg is not installed or issues with the wrong path to the log file, but these seems not to be our case. We are stuck, can somebody help?

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  • Rsyslog stops sending data to remote server after log rotation

    - by Vincent B.
    In my configuration, I have rsyslog who is in charge of following changes of /home/user/my_app/shared/log/unicorn.stderr.log using imfile. The content is sent to another remote logging server using TCP. When the log file rotates, rsyslog stops sending data to the remote server. I tried reloading rsyslog, sending a HUP signal and restarting it altogether, but nothing worked. The only ways I could find that actually worked were dirty: stop the service, delete the rsyslog stat files and start rsyslog again. All that in a postrotate hook in my logrotate file. kill -9 rsyslog and start it over. Is there a proper way for me to do this without touching rsyslog internals? Rsyslog file $ModLoad immark $ModLoad imudp $ModLoad imtcp $ModLoad imuxsock $ModLoad imklog $ModLoad imfile $template WithoutTimeFormat,"[environment] [%syslogtag%] -- %msg%" $WorkDirectory /var/spool/rsyslog $InputFileName /home/user/my_app/shared/log/unicorn.stderr.log $InputFileTag unicorn-stderr $InputFileStateFile stat-unicorn-stderr $InputFileSeverity info $InputFileFacility local8 $InputFilePollInterval 1 $InputFilePersistStateInterval 1 $InputRunFileMonitor # Forward to remote server if $syslogtag contains 'apache-' then @@my_server:5000;WithoutTimeFormat :syslogtag, contains, "apache-" ~ *.* @@my_server:5000;SyslFormat Logrotate file /home/user/shared/log/*.log { daily missingok dateext rotate 30 compress notifempty extension gz copytruncate create 640 user user sharedscripts post-rotate (stop rsyslog && rm /var/spool/rsyslog/stat-* && start rsyslog 2&1) || true endscript } FYI, the file is readable for the rsyslog user, my server is reachable and other log files which do not rotate on the same cycle continue to be tracked properly. I'm running Ubuntu 12.04.

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  • Cannot log into Windows XP Embedded after changing computer name

    - by bignis
    Hi everyone, I purchased a tablet pc running Windows XP Embedded. The tablet was used in a medical clinic on a domain. For illustrative purposes, say the computer name was "COMPLEXCOMPUTERNAME". There was an administrator account, so I changed the password on account "COMPLEXCOMPUTERNAME\Administrator" to a blank password. I logged out and logged in successfully with the blank administrator password when the log-in dialog said "Log in to COMPLEXCOMPUTERNAME (this computer)". Next I renamed the computer from COMPLEXCOMPUTERNAME to SIMPLECOMPUTERNAME, which required a reboot. I did so, and I can't log in anymore. The log in screen still just says "Log in to COMPLEXCOMPUTERNAME (this computer)", but the account "COMPLEXCOMPUTERNAME\Administrator" no longer works. I suspect that this is because the computer has been renamed to SIMPLECOMPUTERNAME and it can no longer find the account. The "Log in to" dropdown can't be typed in, so I can't change the computer name Windows is trying to log into. I fear that I'm stuck. Is there a way I can get Windows to log into the computer name that I chose? Thanks! -Mike

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  • SQLAuthority News – Download Whitepaper – Choosing a Tabular or Multidimensional Modeling Experience in SQL Server 2012 Analysis Services

    - by pinaldave
    Data modeling is the most important task for any BI professional. Matter of the fact, the biggest challenge is to organizing disparate data into an analytic model that effectively and efficiently supports the reporting and analysis. SQL Server 2012 introduces BI Semantic Model (BISM), a single model that can support a broad range of reporting and analysis while blending two Analysis Services modeling experiences behind the scenes. Multidimensional modeling – enables BI professionals to create sophisticated multidimensional cubes using traditional online analytical processing (OLAP). Tabular modeling – provides self-service data modeling capabilities to business and data analysts. As data modeling is evolving and business needs are growing new technologies and tools are emerging to help end users to make the necessary adjustment to the reporting and analysis needs. This white paper is will provide practical guidance to help you decide which SQL Server 2012 Analysis Services modeling experience – tabular or multidimensional. Do let me know what do is your opinion as a comment. In simple word – I would like to know when will you use Tabular modeling and when Multidimensional modeling? Download Choosing a Tabular or Multidimensional Modeling Experience in SQL Server 2012 Analysis Services Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Business Intelligence, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQL White Papers, T SQL, Technology

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  • #1045 Cannot log in to the MySQL server

    - by user1198291
    I am totally new in linux/ubuntu I am trying to setup lamp on my OS, however I've installed apache , php , mysql by following commands: sudo apt-get install apache2 sudo apt-get install php5 sudo apt-get install libapache2-mod-php5 sudo apt-get install mysql-server libapache2-mod-auth-mysql php5-mysql sudo apt-get install phpmyadmin everything works fine except that i totally cannot log into MySQL(which leads to phpmyadmin failure login) getting the errors : #1045 Cannot log in to the MySQL server Access denied for user 'root'@'localhost' (using password: YES) I googled the problem and also I have tried to reinstall all installed components, but the same result came up! in windows i usually modified the content of mysql configure file but in ubuntu nothing is as same as windows!:) can anybody help me on this, really need to setup lampp :-S thanks in advanced

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