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  • List of freely available system administrator books

    - by Sharjeel Sayed
    On the lines of http://stackoverflow.com/questions/194812/list-of-freely-available-programming-books, I'm trying to create a wiki of system administrator books with open source licenses, like Creative Commons, GPL, etc. Feel free to pour in your recommendations. Linux Linux Network Administrator's Guide, 2nd Edition Bash Advanced Bash-Scripting Guide MySQL MySQL Documentation Apache Apache Dektop Reference Networking TCP/IP Tutorial and Technical Overview

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  • Apache2 - mod_expire and mod_rewrite not working in httpd.conf - serving content from tomcat

    - by Ankit Agrawal
    I am using apache2 server running on debian which forwards all the http request to tomcat installed on same machine. I have two files under my /etc/apache2/ folder apache2.conf and httpd.conf I modified httpd.conf file to look like following. # forward all http request on port 80 to tomcat ProxyPass / ajp://127.0.0.1:8009/ ProxyPassReverse / ajp://127.0.0.1:8009/ # gzip text content AddOutputFilterByType DEFLATE text/plain AddOutputFilterByType DEFLATE text/html AddOutputFilterByType DEFLATE text/xml AddOutputFilterByType DEFLATE text/css AddOutputFilterByType DEFLATE text/javascript AddOutputFilterByType DEFLATE application/xml AddOutputFilterByType DEFLATE application/xhtml+xml AddOutputFilterByType DEFLATE application/rss+xml AddOutputFilterByType DEFLATE application/javascript AddOutputFilterByType DEFLATE application/x-javascript DeflateCompressionLevel 9 BrowserMatch ^Mozilla/4 gzip-only-text/html BrowserMatch ^Mozilla/4\.0[678] no-gzip BrowserMatch \bMSIE !no-gzip !gzip-only-text/html # Turn on Expires and mark all static content to expire in a week # unset last modified and ETag ExpiresActive On ExpiresDefault A0 <FilesMatch "\.(jpg|jpeg|png|gif|js|css|ico)$" ExpiresDefault A604800 Header unset Last-Modified Header unset ETag FileETag None Header append Cache-Control "max-age=604800, public" </FilesMatch RewriteEngine On # rewrite all www.example.com/content/XXX-01.js and YYY-01.css files to XXX.js and YYY.css RewriteRule ^content/(js|css)/([a-z]+)-([0-9]+)\.(js|css)$ /content/$1/$2.$4 # remove all query parameters from URL after we are done with it RewriteCond %{THE_REQUEST} ^GET\ /.*\;.*\ HTTP/ RewriteCond %{QUERY_STRING} !^$ RewriteRule .* http://example.com%{REQUEST_URI}? [R=301,L] # rewrite all www.example.com to example.com RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC] RewriteRule ^(.*)$ http://example.com/$1 [R=301,L] I want to achieve following. forward all traffic to tomcat GZIP all the text content. Put 1 week expiry header to all static files and unset ETag/last modified header. rewrite all js and css file to certain format. remove all the query parameters from URL forward all www.example.com to example.com The problem is only 1 and 2 are working. I tried a lot with many combinations but the expire and rewrite rule (3-6) do not work at all. I also tried moving these rules to apache2.conf and .htaccess files but it didn't work either. It does not give any error but these rules are simple ignored. expires and rewrite modules are ENABLED. Please let me know what should I do to fix this. 1. Do I need to add something else in httpd.conf file (like Options +FollowSymLink) or something else? 2. Do I need to add something in apache2.conf file? 3. Do I need to move these rules to .htaccess file? If yes, what should I write in that file and where should I keep that file? in /etc/apache2/ folder or /var/www/ folder? 4. Any other info to make this work? Thanks, Ankit

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  • optimizing operating systems to provide maximum informix performance.

    - by Frank Developer
    Are there any Informix-specific guides for optimizing any operating system where an ifx engine is running? For example, in Linux, strip-down to a bare minimum all unecessary binaries, daemons, utilities, tune kernel parameters, optimize raw and cooked devices (hdparm). Someday, maybe, informix can create its own proprietary PICK-like O/S. The general idea is for the OS where ifx sits on have the smallest footprint, lowest overhead impact on ifx and provide optimized ifx performance.

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  • Cannot Install JDK

    - by Vince
    For the life of me, I can't install the JDK on Windows Vista. I keep getting the error, "This Software Has Already Been Installed on Your Computer. Would you like to reinstall it?" Problem is, it's evidently not on my computer, since I can't a) run Eclipse - I get "Could Not Find Java SE Runtime Environment" or b) Find any reference to Java from the command line when typing java -version - I get "Error opening registry key 'Registry/JavaSoft/Java Runtime Environment." Any ideas?

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  • What does the -R flag do for chflags?

    - by ralphthemagician
    I'm not clear on exactly what the -R flag does for chflags. I was wondering if someone might be able to help me. The man page says this: Recurse: Change the file flags of file hierarchies rooted in the files instead of just the files themselves. I don't understand what that means. Can someone tell me what the difference would be between chflags -R hidden and just chflags hidden? There's an online man page here for reference: http://ss64.com/osx/chflags.html

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  • Apache/Jboss Issue - is this connection timeout?

    - by user115391
    We have an application. The architecture is as below 1 load balancer (apache), which redirects to 2 app servers (jboss). The site is working fine and I am able to access it fine. But sometimes, randomly the homepage takes a while (like 30-40 secs) to load. I tried checking the logs but could not figure out why. I used the httptraffic analyzer, fiddler to see the traffic, but it just says the request/response took 30 secs or so. I checked the apache access logs, mod_jk.log. My configurations are below mod-jk.conf LoadModule jk_module modules/mod_jk.so JkWorkersFile conf/workers.properties JkLogFile logs/mod_jk.log #JkLogLevel info #JkLogLevel debug JkLogLevel error # Select the log format JkLogStampFormat "[%a %b %d %H:%M:%S %Y]" JkOptions +ForwardKeySize +ForwardURICompatUnparsed -ForwardDirectories JkRequestLogFormat "%w %V %T %P %{tid}P %D" JkMount /__application__/* loadbalancer JkUnMount /__application__/images/* loadbalancer <VirtualHost *:8080 > JkMountFile conf/uriworkermap.properties </VirtualHost> JkShmFile run/jk.shm <Location /jkstatus> JkMount status Order deny,allow Deny from all Allow from 127.0.0.1 </Location> ----------------------------- uriworkermap.properties Simple worker configuration file # Mount the Servlet context to the ajp13 worker /=loadbalancer /*=loadbalancer ----------------------------- workers.properties worker.list=loadbalancer,status worker.template.port=8009 worker.template.type=ajp13 worker.template.lbfactor=1 worker.template.prepost_timeout=10000 worker.template.connect_timeout=10000 worker.template.ping_mode=A worker.worker1.reference=worker.template worker.worker1.host=hostname1 worker.worker2.reference=worker.template worker.worker2.host=hostname2 worker.loadbalancer.type=lb worker.loadbalancer.balance_workers=worker1,worker2 worker.status.type=status ----------------------------- my jboss server.xml - $JBOSS_HOME/server/default/deploy/jbossweb.sar/server.xml --------------------------------- The logs from access log is below The issue where it took time - look at the seconds column [23/Mar/2012:12:10:38 -0400] "GET / HTTP/1.1" 200 138 x.x.x.x - - [23/Mar/2012:12:10:49 -0400] "GET /index.jsp HTTP/1.1" 302 - x.x.x.x - - [23/Mar/2012:12:11:10 -0400] "GET /home.jsp HTTP/1.1" 200 936 x.x.x.x - - [23/Mar/2012:12:11:31 -0400] "POST /login/ HTTP/1.1" 200 8895 x.x.x.x - - [23/Mar/2012:12:11:52 -0400] "GET /login/includes/login-style.css HTTP/1.1" 304 - The one after the issue x.x.x.x - - [23/Mar/2012:12:12:18 -0400] "GET / HTTP/1.1" 200 138 x.x.x.x - - [23/Mar/2012:12:12:18 -0400] "GET /index.jsp HTTP/1.1" 302 - x.x.x.x - - [23/Mar/2012:12:12:18 -0400] "GET /home.jsp HTTP/1.1" 200 936 x.x.x.x - - [23/Mar/2012:12:12:18 -0400] "POST /login/ HTTP/1.1" 200 8895 x.x.x.x - - [23/Mar/2012:12:12:18 -0400] "GET /login/includes/login-style.css HTTP/1.1" 304 - Would it be a cache or timeout issue? Any help is appreciated. Thanks.

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  • Deleting jobs from Job History on Xerox Workcentre Pro 123

    - by JPaget
    How do you delete one or more fax jobs from the Job History on a Xerox Workcentre Pro 123? The Xerox Workcentre Pro 123 is a combination copier, printer, scanner and fax machine, and it keeps a history of the numbers dialed for sending faxes, including any long distance access codes that were dialed. In order to keep these access codes private, I'd like to remove these jobs from the job history, or alternatively clear the entire job history. Unfortunately the User Guide and the Quick Reference Guide don't explain how to do this.

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  • CPU, Memory, Network, IO resources are under utilized when I tried various JMeter load testing

    - by Jaiganesh
    CPU, Memory, Network, IO resources are under utilized when I tried various JMeter load testing. I have given below the details. Hardware: 1 Core with 2 GB RAM OS: Ubuntu 12.04 LTS Server Edition Application: PHP (using JQuery, Ajax) JMeter Parameters: 10, 20, 30, 40 Hits per minute 220 Test Cases per hit 2.03 MB per hit I am not clear, why these resources are under utilized. Please help me to resolve this.

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  • Why does the MSDN library constantly say "Information Not Found"?

    - by Zian Choy
    Environment: VS 2008 Pro SP1 MSDN Library for VS2008SP1 Sample Code: Dim userDataset = New DataSet Dim myDataAdapter = New SqlDataAdapter("SELECT UserName FROM tblwebUsers WHERE name = @person", connect) myDataAdapter.SelectCommand.Parameters.Add("@person", SqlDbType.NVarChar) When I put my cursor on the "d" in "Add" and press F1, I get an "Information Not Found" error from the MSDN Library. Does anyone have any suggestions for addressing the issue?

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  • Trying to setup postfix

    - by Frexuz
    I used this guide: http://jonsview.com/how-to-setup-email-services-on-ubuntu-using-postfix-tlssasl-and-dovecot telnet localhost 25 says 220 episodecalendar.com ESMTP Postfix (Ubuntu) ehlo localhost 250-episodecalendar.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN Installation seems fine? /var/log/mail.log says Nov 26 14:04:06 ubuntu postfix/pickup[12107]: A742E2B9E1: uid=0 from=<root> Nov 26 14:04:06 ubuntu postfix/cleanup[12114]: A742E2B9E1: message-id=<[email protected]> Nov 26 14:04:06 ubuntu postfix/qmgr[12108]: A742E2B9E1: from=<[email protected]>, size=300, nrcpt=1 (queue active) Nov 26 14:04:06 ubuntu postfix/local[12115]: A742E2B9E1: to=<[email protected]>, relay=local, delay=3.3, delays=3.3/0/0/$ Nov 26 14:04:06 ubuntu postfix/cleanup[12114]: AD2662B9E0: message-id=<[email protected]> Nov 26 14:04:06 ubuntu postfix/qmgr[12108]: AD2662B9E0: from=<>, size=2087, nrcpt=1 (queue active) Nov 26 14:04:06 ubuntu postfix/bounce[12117]: A742E2B9E1: sender non-delivery notification: AD2662B9E0 Nov 26 14:04:06 ubuntu postfix/local[12115]: AD2662B9E0: to=<[email protected]>, relay=local, delay=0.02, delays=0.01/0/0/0$ Nov 26 14:04:06 ubuntu postfix/qmgr[12108]: AD2662B9E0: removed Nov 26 14:04:06 ubuntu postfix/qmgr[12108]: A742E2B9E1: removed I'm not really understanding the log file, and obviously I'm not getting any emails. Right now I'm running Ubuntu on a Virtualbox (development box). Is that a problem? The internet connection works fine on it. What about domains etc..? edit: /etc/postfix/main.cf # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_use_tls = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. # See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_use_tls = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client.

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  • Anyone know why the Intel q9400 cpu is embedded?

    - by Wil
    I was just looking through the Intel site and I came across this - http://ark.intel.com/ProductCollection.aspx?familyID=28398 Anyone know why the 9400 has a tick in the embedded column? I have tried to contact Intel and not had a response. I have looked around but cannot find any additional reference and it seems to be available from shops just like any other CPU. Anyone have any ideas?

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  • SSH: How to change value in config file in one command

    - by Brian Graham
    How can I change the value of, let's say, PasswordAuthentication in /etc/ssh/sshd_config in commands? As well, remove a # in front of the "key" I wish to value. These don't all have to be in one command. I setup quite a few servers, and remembering where everything is gets exhausting, so I want to get a series of commands I can copy paste and it does the work for me for future reference. Sample values: PermitRootLogin no ChallengeResponseAuthentication no PasswordAuthentication no UsePAM no UseDNS no

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  • web services access not being reached thru the web browser

    - by Tony
    I am trying to reference my .asmx webservices in .NET but my server is not exposed to the internet. When I put on the following address I get the message mentioned below. What's the reason for not being able to see the directory? Am I missing something in my IIS configuraction? Am I missing anything in my permissions? Just as reference I have other folders with webservices and I have the same issue. When I login to the server I am doing it with my windows user and password (I am using windows authentication). It's necessary to mention that when I put the URL I am getting a popup screen to put in my userid and password but it seems that's not able to validate since keeps asking me a couple of times. Let me know if you need more information to address this issue . http://appsvr02/Inetpub/wwwroot/DevWebApi/ Internet Explorer cannot display the webpage What you can try: It appears you are connected to the Internet, but you might want to try to reconnect to the Internet. Retype the address. Go back to the previous page. Most likely causes: •You are not connected to the Internet. •The website is encountering problems. •There might be a typing error in the address. More information This problem can be caused by a variety of issues, including: •Internet connectivity has been lost. •The website is temporarily unavailable. •The Domain Name Server (DNS) is not reachable. •The Domain Name Server (DNS) does not have a listing for the website's domain. •If this is an HTTPS (secure) address, click tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section. For offline users You can still view subscribed feeds and some recently viewed webpages. To view subscribed feeds 1.Click the Favorites Center button , click Feeds, and then click the feed you want to view. To view recently visited webpages (might not work on all pages) 1.Click Tools , and then click Work Offline. 2.Click the Favorites Center button , click History, and then click the page you want to view.

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  • Apache keeps crashing due to unable to create worker thread

    - by Dina Abu-khader
    Hello , Am getting a lot of these in our error log ((11)Resource temporarily unavailable: apr_thread_create: unable to create worker thread) and (110)Connection timed out: proxy: HTTP: attempt to connect to 127.0.0.1:80 (*) failed The parameters of the worker in httpd.conf are as follows StartServers 8 ServerLimit 128 MaxClients 2048 MinSpareThreads 25 MaxSpareThreads 75 ThreadsPerChild 32 MaxRequestsPerChild 10000 I have changed the stack size in limit.conf but still not helping , Can anyone please help me ?

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  • Trying to setup phpUnderControl but missing phpcb

    - by blcArmadillo
    Hi, I'm trying to setup phpUnderControl on Ubuntu 10.04 following this tutorial http://techportal.ibuildings.com/2009/03/03/getting-started-with-phpundercontrol/. I get to the part where it says to type in sudo phpuc example /opt/cruisecontrol but recieve the following error: Missing cli tool 'phpcb', check the PATH variable. I did a little googling but can't seem to find reference of a phpcb anywhere. Does anyone know what this is and where I might get it? Thanks.

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  • Using /etc/services for in-house well-known ports

    - by LavaScornedOven
    I couldn't find anything much about this, but I'm interested what are pros and cons (if any) in using /etc/services for in-house software? On my Linux distro (Ubuntu 14.04) at the end of /etc/services is a comment: # Local services hinting that it could be a good thing to do. One thing that comes to mind is that having in-house ports in /etc/services would make serv database a reference point for common knowledge and much better source of default ports for applications throughout the system.

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  • Screen is greyed out after power failure shutdown: Mac OSX

    - by Don MacLachlan
    When the battery power is down and the unit not plugged in the computer is forced into a sleep mode requiring pushing the start button when power is re-connected. The initial desktop screen appears to be greyed out and is unresponsive with a timer bar which, when the timing sequence is complete restores an active desktop. I can't find any reference to this phenomenon in the OSX literature I have. Any pointers to where I can get more information? Perhaps I am using the wrong search criteria?

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  • How does Windows Task Scheduler detect that a task is already running?

    - by Dan C
    I have an application on Windows Server 2008 that takes different command-line parameters. For example: myapp.exe /A myapp.exe /B I have created a task scheduler task for each of those. While "myapp.exe /A" is running, I want to prevent another instance of it from starting. However, I still want "myapp.exe /B" to be able to run (again, though only one instance of it at a time). How can I set this up?

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  • Remote installing an msi on citrix servers using WMI

    - by capn
    OK, I'm a C# programmer that is trying to streamline the deployment of a custom windows form app I inherited and built an installer for with WiX (this app will need to be reinstalled regularly as I'm making changes to it). I'm not really used to admin type things (or vbs, or WMI, or terminal servers, or Citrix, and even WiX and MSI are not things I usually deal with) but so far I put together some vbs and have an end goal in mind. The msi does work, and I've installed it from the mapped O: drive on my dev machine and while RDP'd to a citrix machine. End Goal: Deploy code written on my dev machine and compiled into an MSI (that I can improve upon within the confines of WiX and whatever the Windows Installer Engine allows) to the cluster of Citrix machines my users have access to. What am I missing in my script to get the MSI to execute on the remote machines? Layout: Machine A is my dev machine, and has the vbs script and the msi file (XP SP3) Machines C1 - C6 are the Citrix Servers that need the application installed them via the msi (Server 2003 R2 SP2) There is also optionally a shared network resource that all the machines can access. Script: 'Set WMI Constants Const wbemImpersonationLevelImpersonate = 3 Const wbemAuthenticationLevelPktPrivacy = 6 'Set whether this is installing to the debug Citrix Servers Const isDebug = true 'Set MSI location 'Network location yields error 1619 (This installation package could not be opened.) msiLocation = "\\255.255.255.255\odrive\Citrix Deployment\Setup.msi" 'Directory on machine A yields error 3 (file not found) 'msiLocation = "C:\Temp\Deploy\Setup.msi" 'Mapped network drive (on both machines) yield error 3 (file not found) 'msiLocation = "O:\Citrix Deployment\Setup.msi" 'Set login information strDomain = "MyDomain" Wscript.StdOut.Write "user name:" strUser = Wscript.StdIn.ReadLine Set objPassword = CreateObject("ScriptPW.Password") Wscript.StdOut.Write "password:" strPassword = objPassword.GetPassword() 'Names of Citrix Servers Dim citrixServerArray If isDebug Then citrixServerArray = array("C4") Else 'citrixServerArray = array("C1","C2","C3","C5","C6") End If 'Loop through each Citrix Server For Each citrixServer in citrixServerArray 'Login to remote computer Set objLocator = CreateObject("WbemScripting.SWbemLocator") Set objWMIService = objLocator.ConnectServer(citrixServer, _ "root\cimv2", _ strUser, _ strPassword, _ "MS_409", _ "ntlmdomain:" + strDomain) 'Set Remote Impersonation level objWMIService.Security_.ImpersonationLevel = wbemImpersonationLevelImpersonate objWMIService.Security_.AuthenticationLevel = wbemAuthenticationLevelPktPrivacy 'Reference to a process on the machine Dim objProcess : Set objProcess = objWMIService.Get("Win32_Process") 'Change user to install for terminal services errReturn = objProcess.Create _ ("cmd.exe /c change user /install", Null, Null, intProcessID) WScript.Echo errReturn 'Install MSI here 'Reference to a product on the machine Set objSoftware = objWMIService.Get("Win32_Product") 'All users set in option parameter, I'm led to believe that the third parameter is actually ignored 'http://www.webmasterkb.com/Uwe/Forum.aspx/vbscript/2433/Installing-programs-with-VbScript errReturn = objSoftware.Install(msiLocation,"ALLUSERS=2 REBOOT=ReallySuppress",True) Wscript.Echo errReturn 'Change user back to execute errReturn = objProcess.Create _ ("cmd.exe /c change user /execute", Null, Null, intProcessID) WScript.Echo errReturn Next I also tried using this to install, it doesn't return an error code, but doesn't install the msi either, and it makes me wonder if the change user /install command is even really working. errReturn = objProcess.Create _ ("cmd.exe /c msiexec /i ""O:\Citrix Deployment\Setup.msi"" /quiet") Wscript.Echo errReturn

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  • Alternative to PuTTY Connection Manager?

    - by OverTheRainbow
    Development of the free application Putty Connection Manager that can display more than one Putty sessions stopped in 2009, and it sometimes triggers this error when I double-click on any host in the right hand-side list: PuTTY Connection Manager/An unexpected error occured : Object reference not set to an instance of an object.. When that happens, I have to reboot :-/ Does someone know of an alternative? Thank you.

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  • Command line options in Filezilla.

    - by Quintin Par
    How do I invoke Filezilla from the command line to upload the contents of a directory? I would also like to set parameters like overwrite all etc. From help page all I see is options for opening Filezilla with specific server etc, but not to upload...

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