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Articles indexed in October 2012

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  • How do you set up CRON?

    - by user1723760
    I have never used CRON before but I want to use CRON in order to be able to perform schedule jobs for a php script. The php script is called "inactivesession.php" and in the php script is this code: <?php include('connect.php'); $createDate = mktime(0,0,0,10,25,date("Y")); $selectedDate = date('d-m-Y', ($createDate)); $sql = "UPDATE Session SET Active = ? WHERE DATE_FORMAT(SessionDate,'%Y-%m-%d' ) <= ?"; $update = $mysqli->prepare($sql); $update->bind_param("is", 0, $selectedDate); $update->execute(); ?> Wht I want to do is that when the above date is reached (25th Oct), I want the php script to perform the UPDATE statement above. But my question is that how do I use CRON in order to do this? The server I am using is the university's server known as helios, does CRON need to be set up in helios, (do I have to call the admin for this) or is it something else which uses CRON. I have never used CRON before so can you explain to me how CRON can be set up for the example above with the server I am using? Thanks UPDATE: Hi, I think the name of the OS is actually helios but I am not sure, I have a wikipedia page on this: here. I will read the crontab wikipedia page and see what I can find, but what my question is that is CRON already set up, do I just go right ahead and use CRON or do I need to set it up first?

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  • Invalid Parameter on node puppet

    - by chandank
    I am getting an error of err: Could not retrieve catalog from remote server: Error 400 on SERVER: Invalid parameter port at /etc/puppet/manifests/nodes/node.pp:652 on node test-puppet My puppet class: (The Line 652 at node.pp) node 'test-puppet' { class { 'syslog_ng': host => "newhost", ip => "192.168.1.10", port => "1999", logfile => "/var/log/test.log", } } On the module side class syslog_ng::config ( $host , $ip , $port, $logfile){ file {'/etc/syslog-ng/syslog-ng.conf': ensure => present, owner => 'root', group => 'root', content => template('syslog-ng/syslog-ng.conf.erb'), notify => Service['syslog-ng'], require => Class['syslog_ng::install'], } file {"/etc/syslog-ng/conf/${host}.conf": ensure => present, owner => 'root', group => 'root', notify => Service['syslog-ng'], content => template("syslog-ng/${host}.conf.erb"), require => Class['syslog_ng::install'], } } I think I am doing it as per the puppet documentation.

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  • mkfs.xfs: libxfs_device_zero write failed: Input/output error

    - by Crazy_Bash
    I can't find a way to create a filesystem on one of my disks. first i'm geting the following output: [root@~]# mkfs.xfs /dev/sdb1 mkfs.xfs: /dev/sdb1 appears to contain a partition table (dos). mkfs.xfs: Use the -f option to force overwrite. after using -F flag: [root@~]# mkfs.xfs -f /dev/sdb1 meta-data=/dev/sdb1 isize=256 agcount=32, agsize=22892696 blks = sectsz=512 attr=2 data = bsize=4096 blocks=732566272, imaxpct=5 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal log bsize=4096 blocks=357698, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 **mkfs.xfs: libxfs_device_zero write failed: Input/output error** /dev/sdb: Disk /dev/sdb: 3001GB 1 1049kB 3001GB 3001GB primary Linux: Centos 6.3 Linux 1 2.6.32-279.el6.x86_64 #1 SMP Fri Jun 22 12:19:21 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux what i've tried so far: recreating partition with parted rm 1

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  • Apache is reponding a blank white page

    - by Bruno Araujo
    I have the following situation: A site hosted in apache 2.4, with ssl, that works like a charm for a while now, but out of no where, without modifications to the site, apache started serving random blank pages. The workaround this is to delete the cookies of the browser or restart the browser. I've switched the vitualhost to log in debug mode but it didn't got me anywhere. Here is the debug log of a failed page load: [Wed Oct 24 10:57:35.762547 2012] [ssl:info] [pid 27854:tid 140617706374912] [client 192.168.10.150:58917] AH01964: Connection to child 147 established (server xxx.com.br:443) [Wed Oct 24 10:57:35.762739 2012] [ssl:debug] [pid 27854:tid 140617706374912] ssl_engine_kernel.c(1966): [client 192.168.10.150:58917] AH02043: SSL virtual host for servername xxx.com.br found [Wed Oct 24 10:57:35.777479 2012] [ssl:debug] [pid 27854:tid 140617706374912] ssl_engine_kernel.c(1899): [client 192.168.10.150:58917] AH02041: Protocol: TLSv1, Cipher: DHE-RSA-AES256-SHA (256/256 bits) [Wed Oct 24 10:57:35.779912 2012] [ssl:debug] [pid 27854:tid 140617706374912] ssl_engine_kernel.c(243): [client 192.168.10.150:58917] AH02034: Initial (No.1) HTTPS request received for child 147 (server xxx.com.br:443) [Wed Oct 24 10:57:35.780044 2012] [authz_core:debug] [pid 27854:tid 140617706374912] mod_authz_core.c(809): [client 192.168.10.150:58917] AH01628: authorization result: granted (no directives) [Wed Oct 24 10:57:40.783950 2012] [ssl:info] [pid 27854:tid 140617706374912] (70007)The timeout specified has expired: [client 192.168.10.150:58917] AH01991: SSL input filter read failed. [Wed Oct 24 10:57:40.784077 2012] [ssl:debug] [pid 27854:tid 140617706374912] ssl_engine_io.c(988): [remote 192.168.10.150:58917] AH02001: Connection closed to child 147 with standard shutdown (server xxx.com.br:443)

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  • Network latency and speed of light

    - by James
    This was kinda of covered by the following Is minimum latency fixed by the speed of light? , but i would like to add the follow up a bit. The scenario is as follows; we have two opposing sites one on the West Coast of the US and one in Ireland. The customer is in central Europe, and has requested a latency test. Ireland gives responses of ~65-70ms. However the West Coast guys claim to be faster with a response of 60ms. Now a quick check says that light in fiber would take about 42ms to make the trip to the States and 8.5ms to Ireland. So obviously this is a single hop and does not include routers, switches, firewalls, protocol overhead etc. Would I be right to call BS on their figures? As a final note I tested a ping to Google IP address that was allegedly on the west coast from a site that covered a similar distance and was amazed to get a response time of 20ms. Suggesting ICMP packets that travel twice the speed of light. So A) what am I missing B) Am I right to suspect shenanigans? UPDATE: Guys thanks so far for your help and I have been reading various previous questions on this. About 5 years I had an issue where the hop from the UK to Ireland added 10ms of latency no matter what we did. In the end I moved the servers; So imagine my surprise when I have guys that claim they are 5ms faster with a transatlantic trip. So again should I call BS? Oh and assume both sites are normal mortals that don't have access to Google magical routing, warp dives or flux capacitors. :)

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  • Creating a pseudoterminal to make sudo happy

    - by larsks
    I need to automate the provisioning of a cloud instance (running Fedora 17) for which the following initial facts are true: I have ssh-key based access to a remote user (cloud) That user has password-free root access via sudo. Manual configuration is as simple as logging in and running sudo su - and having at it, but I would like to fully automate this process. The trick is that the system defaults to having the requiretty option enabled for sudo, which means that an attempt to do something like this: ssh remotehost sudo yum -y install puppet Will fail: sudo: sorry, you must have a tty to run sudo I am working around this right now by first pushing over a small Python script that will run a command on a pseudoterminal: import os import sys import errno import subprocess pid, master_fd = os.forkpty() if pid == 0: # child process: now that we're attached to a # pty, run the given command. os.execvp(sys.argv[1], sys.argv[1:]) else: while True: try: data = os.read(master_fd, 1024) except OSError, detail: if detail.errno == errno.EIO: break if not data: break sys.stdout.write(data) os.wait() Assuming that this is named pty, I can then run: ssh remotehost ./pty sudo yum -y install puppet This works fine, but I'm wondering if there are solutions already available that I haven't considered. I would normally think about expect, but it's not installed by default on this system. screen can do this in a pinch, but the best I came up with was: screen -dmS sudo somecommand ...which does work but eats the output. Are there any other tools available that will allocate a pseudoterminal for me that are going to be generally available?

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  • nginx: URL rewrites and performance

    - by j0nes
    I have a website where I need to change the URL structure. The old URLs look like /olddir/part1_de.htm, the new ones will look like /newdir/sub/category/anotherpage.htm. There are a lot of URL rewrites I need to do, I assume about 500 distinct rewrites in the end. As my website gets quite a lot of traffic, my main concern is about performance at the moment. My questions are: I assume that for each request, the rewrites block will be parsed and the regex will be evaluated. Am I right? Will there be a performance penalty if I use these rewrites? Can nginx handle this? Are there any "best practices" to follow when doing a lot of rewrites?

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  • Can I lvreduce after lvextend without losing the ext4 partition inside it?

    - by DrSAR
    In a botched attempt to move my root partition from one disk to another I have done the following: added new disk partitioned it with parted (part #3 is now almost totally filling the disk) initialized a physical volume $ pvcreate /dev/sdb3 Physical volume "/dev/sdb3" successfully created extended the volume group to include this new physical disk $ vgextend myvg /dev/sdb3 Volume group "myvg" successfully extended extended the logical volume (I think this is where I ballsed it up: I think I should have pvmove'ed stuff to the new pv in that group - can someone confirm?) $ lvextend /dev/mapper/myvg-root /dev/sdb3 I would now like to undo the lvextend and then proceed with the original plan of moving the content of the old physical volume over to the new physical volume. Can I reduce the logical volume (I have not yet touched the ext4 partition that sits in /dev/mapper/myvg-root with something like resizefs) without fear of damaging the ext4 filesystem? If so, how do I tell it to reduce by exactly the right amount? $ lvreduce --by-exactly-the-amount-occupied-by-PV /ev/sdb3 /dev/mapper/myvg-root

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  • openvpn in a bridge?

    - by sebelk
    I have a somewhat tricky proble to solve. We have a wireless link between 2 building. One of them has an mikrotik and below there are some vlans. Some machines of one vlan need to use openvpn to connect to a remote private lan. I put a TP-Link WR1043ND (which those machines connect to) with openwrt with ebtables just in case I need it. I've configured openwrt in such a way that all ports belongs to the same vlan. My idea was to make things as transparent as I can. It has a bridge as follows: usr/sbin/brctl-full show br-lan bridge name bridge id STP enabled interfaces br-lan 8000.f8d111565716 no eth0.1 eth0.2 Also I've added an ebtables rule: ebtables -t broute -A BROUTING -p ipv4 -j DROP So "bridge" has only one IP address. I've installed openvpn and I'm trying to bring up the tunnel but I can't still get working. Sure, someone can says why don't you use the vpn on the mikrotik, there are some reasons, the first one is I have little experience with mikrotik and I'd want to have the vpn at hand :) The problem is that openvpn is not working, because it is complaining that I have only one Ip Address on the server side. So I set up and alias interface with another IP address but is not working either: : Rejected connection attempt from IP-Client-Side:37801 due to --remote setting Is there a way to make it work?

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  • maintaining redirects in nginx from an external source

    - by Sascha
    I am in the situation to give our marketing department the opportunity to maintain their redirects by their own. Until now, they passed the information to the IT department and we maintained it for them in nginx.conf. Some of these guys are quite familiar with redirections in IIS or even in apache but it is no option to give them direct access to the nginx configuration. I see, that there is no nginx support for .htaccess files which I could give access to and I would also prefer not to grant write access to an conf-file that nginx includes. I expect, that our marketing will break our nginx setup within hours... Is there a secure possibility without giving them access our the heart of our load balancer?

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  • get a list of running ec2 instances programmatically

    - by user113981
    Hi i have started with aws and found out that we can get a list of running servers with the aws php sdk. Is there any other way to get the list of all ec2 instances? after getting the list i want to sync the data from one main instances to all the instances. Something like a button click can also do the operation. Are rsync, incron the only options, or it can be done by aws php sdk also. Please provide some tutorial links.

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  • Mongo Client RedHat EL5 UT8 Support

    - by Michael Irey
    # mongo MongoDB shell version: 1.6.4 Fri Mar 16 11:55:46 *** warning: spider monkey build without utf8 support. consider rebuilding with utf8 support connecting to: test Mongo Server seems to handle the utf8 characters fine, as well as my php-mongo-client driver. But when I try to query a record that has a utf8 character from the mongo command line client I get: > db.Users.find({age:33}); error:non ascii character detected Fri Mar 16 11:55:43 mongo got signal 11 (Segmentation fault), stack trace: Fri Mar 16 11:55:43 0x440b50 0x3664c302d0 0x3f47e7b6e0 0x3f47e83bbd 0x3f47e254f3 0x3f47e25660 0x3f47e256ee 0x3f47e25792 0x3f47e2876e 0x4b031d 0x443b72 0x445476 0x3664c1d994 0x43fd39 mongo(_Z12quitAbruptlyi+0x3b0) [0x440b50] /lib64/libc.so.6 [0x3664c302d0] /usr/lib64/libjs.so.1 [0x3f47e7b6e0] /usr/lib64/libjs.so.1(js_CompileTokenStream+0x3d) [0x3f47e83bbd] /usr/lib64/libjs.so.1 [0x3f47e254f3] /usr/lib64/libjs.so.1(JS_CompileUCScriptForPrincipals+0x60) [0x3f47e25660] /usr/lib64/libjs.so.1(JS_EvaluateUCScriptForPrincipals+0x3e) [0x3f47e256ee] /usr/lib64/libjs.so.1(JS_EvaluateUCScript+0x22) [0x3f47e25792] /usr/lib64/libjs.so.1(JS_EvaluateScript+0x6e) [0x3f47e2876e] mongo(_ZN5mongo7SMScope4execERKSsS2_bbbi+0xed) [0x4b031d] mongo(_Z5_mainiPPc+0x14a2) [0x443b72] mongo(main+0x26) [0x445476] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3664c1d994] mongo(__gxx_personality_v0+0x269) [0x43fd39] Any ideas or suggestions would be welcome

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  • Exchange 2010 Room Mailbox Calendar Permissions

    - by Brian Mitchell
    Exchange 2010 sp2 Outlook 2007/2010 Server 2008 I have managed to set up several room mailboxes in exchange, people are able to book the rooms and they get a response from the exchange server. this is brilliant. however users are unable to view the calendar of the room mailbox to see what times are available, in a ideal world I would like users to only see if the room is free or not. I dont want users to see the details of the meeting (title, description etc) I have been trying to do this using the following command Add-MailboxFolderPermission -Identity meetingroom -User "Usergroup" -AccessRights AvailabilityOnly -DomainController AD-Server This throws the following error Specified argument was out of the range of valid values. Parameter name: memberRights + CategoryInfo : NotSpecified: (meetingroom:MailboxFolderIdParameter) [Add-MailboxFolderPermission], Argum entOutOfRangeException + FullyQualifiedErrorId : CBC6516F,Microsoft.Exchange.Management.StoreTasks.AddMailboxFolderPermission Any help on the situation would be brilliant, i have been trying to get this done for a couple of days and im going around in circles.

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  • Hostname Problem On WHM / cPanel Installation

    - by Eray
    My CentOS 5.6 server's hostname was "centos" . And then i change it to my domain : hostname domain.com And i started to installing WHM / cPanel as explained in here : http://etwiki.cpanel.net/twiki/bin/view/AllDocumentation/InstallationGuide/InstallingCpanel It's installed very well. And the i reboot my server. After rebooting, i was execute this command for open WHM's 2087 port : iptables -I RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 2087 -j ACCEPT Now i'm trying to browse domain.com:2087 i'm getting Server (centos) not found .I noticed it's forwarding to my old hostname (centos) . And then execute this command to verify me hostname hostname it's returned "centos" again. I'm not sure, why it's returned to old hostname. (I think it returned to old hostname after rebooting) . I'm changed it one more time : hostname domain.com Finally, now my hostname is domain.com . BUt still i'm getting centos server not found error. This is result of iptables -L command. P.S. : domain.com/cpanel is working

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  • Ubuntu cannot resolve unmet dependency

    - by DisgruntledGoat
    I'm trying to install a package on my Ubuntu 8.10 server. However, I get this message: The following packages have unmet dependencies. webmin: Depends: apt-show-versions but it is not going to be installed E: Unmet dependencies. Try ‘apt-get -f install’ with no packages (or specify a solution). So I run apt-get -f install which offers to install apt-show-versions and libapt-pkg-perl. After selecting to install without verification, I get these errors: Err http://gb.archive.ubuntu.com intrepid/universe libapt-pkg-perl 0.1.22build1 404 Not Found Err http://gb.archive.ubuntu.com intrepid/universe apt-show-versions 0.13 404 Not Found Failed to fetch http://gb.archive.ubuntu.com/ubuntu/pool/universe/liba/libapt-pkg-perl/libapt-pkg-perl_0.1.22build1_i386.deb 404 Not Found Failed to fetch http://gb.archive.ubuntu.com/ubuntu/pool/universe/a/apt-show-versions/apt-show-versions_0.13_all.deb 404 Not Found E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? I've tried running apt-get update and adding --fix-missing as suggested, but neither works. Where do I go from here?

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  • SVN + Active Directory

    - by rudigrobler
    How do I setup SVN (On a linux box - Centos 5.2) to authenticate using Active Directory? Also: Any tips or tricks? What should I watch out for? How fine grain can I set the access? This group have access to these projects, etc? And how does this work if I use something like tortoissvn to access my repository? What I have learned so far: you need the following modules installed for apache mod_ldap mod_authnz_ldap mod_dav mod_dav_svn mod_authz_svn?

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  • Multiple workstation setups using virtualization - best solution

    - by Vazgen
    I'm looking to set up a server for my small startup. I have a few employees and would like to use my computer at home to provide them all with workstations. Each workstation should have the same collection of software installed but each user's workstation should be completely separate from the others. I need each user to be able to remotely log in to their workstation (using TeamViewer or something like it) and I want to be able to monitor their workflow from my screen. I suppose I need a virtualization solution. Can anybody recommend one with easy set up, I'm not a server administrator.

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  • Use test to check for condition with find and execdir option

    - by slosd
    I think I can keep my question short. Why does the following command produce no output? find /usr/share/themes -mindepth 1 -maxdepth 1 -type d -execdir test -d {}/gnome-shell \; I expected it to print all folders in /usr/share/themes that contain a folder gnome-shell. Several websites suggest that this usage of test as a command in exec/execdir is possible. From man find: -exec command ; Execute command; true if 0 status is returned. [...]

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  • No Sound on Debian

    - by danielson
    I've been dabbing around with LinuxMint Debian and i'm not getting any sound. Have removed Pulse = still no sound. Re-installed it, still no sound. Basically the only sound i get is when i perform the test with the Logitech headset. Otherwise, no sound anywhere. Have also tried an experimental version of LM Debian KDE but same story. Anyone else in a similar predicament? Here are my laptop's specs on Windows 7 .32bit : https://www.dropbox.com/s/7j0l0odzn07vq0o/Screenshot%20-%20System%20Info.jpg

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  • How do I restore tab-completion on shell variables on the bash command-line?

    - by Eric
    I've long set my most-recently visited directories to shell variables d1, d2, etc. On an ancient Fedora machine I could type a command like $ cp $d1/ and the shell would replace $d1 with text like /home/acctname/projects/blog/ and would then show me the contents of .../blog, like any tab-completion. Now, both ubuntu wheezy/sid and fedora 16 just -escape the '$', and naturally there are no completions to show. You can see this behavior in action in an OSX Terminal window. On 10.8, do something like ls $HOME/ to see what I mean. Is there a bash shell variable or option that can restore the old behavior? man bash suggests this is a bug: complete (TAB) Attempt to perform completion on the text before point. Bash attempts completion treating the text as a variable (if the text begins with $), username (if the text begins with ~), hostname (if the text begins with @), or command (including aliases and functions) in turn. If none of these produces a match, filename completion is attempted. I get the above described completion when a token starts with '~' or a letter. It's just '$'-completion that's broken.

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  • cygwin Xserver losing connection

    - by gt6989b
    I am running Xserver on cygwin (on top on Windows 7), and then using xterm to remote to linux via ssh -X, and run remote applications there, like konsole, emacs and others. Initially all works fine, e.g. executing emacs pops up the correctly working window on my Windows 7 box. But if I try to run the same emacs some time (like an hour) later, I get a linux message Display localhost:10.0 unavailable, simulating -nw and emacs runs in-line. I have checked and the Xserver seems still up and running ok. Indeed, if I exit out to the original cygwin and reconnect to Linux by ssh -X again, it works just fine. Would you know what is happening and how can it be fixed? Why is my Xserver connection being dropped? Thank you very much.

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  • Windows non-responsive during Remote Desktop connection

    - by pvieira
    This is Windows 7 Ultimate 64 bit. I use the command mstsc to establish a Remote Desktop connction to a remote server. The login window shows up, and while I'm entering the password the system almost freezes. Each character of the password takes 3 or 4 seconds to be accepted, and all other opened programs are not accessible. This behavior tends to happen only the first time I use mstsc. If I used it again moments later, everything is normal. Whar can be the cause of this problem?

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  • How to get more info out of the uninformative Windows 8 BSoD?

    - by amiregelz
    Windows 8's Blue Screen of Death is different from the previous Windows versions' one: In order to find out what caused the problem you need to write down or remember the search term it presents you with. The two search terms I have seen suggested so far are SYSTEM_SERVICE_EXCEPTION and HAL_INITIALIZATION_FAILED. Both of them are quite generic terms. While it’s nice not to have to look at a blue screen full of text, the previous BSoD was more informative than the Windows 8 BSoD, since it contained a detailed error code (information for diagnostic purposes that was collected as the operating system performed a bug check), which could get you closer to tracking down the root of the problem. How can I get more information about the error Windows 8 has encountered, in order to track down the root of the problem?

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  • Volume keys not working after installing Silverlight

    - by terry
    I downloaded Silverlight for Safari to use Netflix. This download has caused my MacBook's volume keys to become non-functional, although I can still change volume through the icon in the menu bar or through system preferences. When I press the keys to change the volume, the transparent volume icon appears on the screen with a circle-slash icon at bottom center. Does anyone know how to make the keys functional again? I deleted Silverlight but still no sound.

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  • Vista Startup - Cannot Find the File Specified

    - by Redmastif
    Yesterday I restarted my laptop because my Wi-Fi catcher wasn't working correctly, and when the computer reached the login screen, instead of showing my user account it said "Cannot find the file specified". I rebooted and ran the Startup Repair and Memory Diagnostics but nothing showed up. I also took the battery out for a minute and tried again but still no luck. The weird thing is that I cannot even boot into safe mode, it still shows the same error. I don't remember downloading or opening anything suspicious recently, and I have 3 different cleaners/anti-malware programs as well that I usually run about once a week. I did go into the registry recently but I didn't modify or delete anything as I was only checking to see if I had a certain key in it. I have a Dell laptop running Vista Home Basic SP2. If I have to I can reinstall the OS with the CD or even take it to Best Buy but I'd rather try and fix it first. Thanks.

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