CentOS is an abbreviation for Community Enterprise Operating System that aims to be compatible with its upstream source, Red Hat Enterprise Linux. CentOS 6 is the 6th major version of CentOS, which was released on July 10th, 2011.

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CentOS 6 Getting Sudo to show the display in a FreeNX session

My platform is a 32-bit installation of CentOS 6.4 with a gnome desktop and the FreeNX server. When I log into an NX session (usually using NoMachine NX Client), and then try to open an application ...
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Desktop Gone in Centos 6

I had a third party library created a ~ folder (a bug there), and I tried to delete it by "rm -rf ~". And apparently, it is a mistake -- my session got rebooted and then when I went back in, all the ...
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90 views

Centos 6.5( Desktop edition ) - Skype 4.0 login issue

I have installed Skype 4.0 on Centos 6.5. When I am trying to log into Skype, it tells me that the server failed to connect. Note: I also removed the ~/.Skype directory under the home directory. I'm ...
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21 views

Moving to a complete Nginx/PHP-FPM environment from Apache

I am sure this is a question many beginner sysadmins like me have, and many more advanced people have already put this in place: CURRENT PLATFORM: Nginx proxying to Apache, which manages PHP ...
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21 views

Printing from Centos (CUPS) to a windows print server over HTTPS takes forever

I have a Centos server setup up to print to a Windows server 2012 (though version may not matter) across the internet. When I use HTTP to make the IPP call the process is nearly instant and works ...
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23 views

Linux ALSA: No sound out from internal speaker

There is no audio output when running "Test Speakers" in Sound Preferences -> Hardware -> pcsp. The internal speaker worked fine under Windows. Sound can, however, be heard when headphones or a ...
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70 views

Warning: remote port forwarding failed for listen port on Centos 6

I have a problem with port forwarding in centos 6, when i do: ssh -v -R root@hostname:19999:localhost:22 root@hotname I get this warning: Warning: remote port forwarding failed for listen port ...
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31 views

CentOS 6.5 PHP extensions

I need to enable php extensions like PDO and GD but I can't find a section with all the PHP extensions enabled inside /etc/php.ini, so in which file is this defined? EDIT: using PHP Version 5.5.14 or ...
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31 views

libssl.so.6: cannot open shared object file

I tried installing my application in a CentOS 6 server. But while I am starting Apache(Server version: Apache/2.2.26 (Unix)), I am getting error like [error] install_driver(mysql) failed: Can't ...
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61 views

Tuleap: Configuration of Bug Tracker report

I created a Bug Tracker and open different bugs. When I enter in my Bug Tracker, I see a web page with a search form in the upper part and a list with the different bugs in the lower part. However by ...
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14 views

Tuleap: display of project description

I entered a list in the description of my project with carriage return after each item of the list. However in the project page, when Tuleap displays the descritpion of the project, it suppressed the ...
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32 views

Linux Box Internet Speed

I have encountered a weird problem with my Centos6 Server, currently I have install Centos6.4 on a 64bit support CPU with 8GB of RAM and 500GB HDD. Just went to check on the internet this morning and ...
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36 views

Blank screen, CentOS 6.5

I'm on a Dell PowerEdge 2850, and I recently installed CentOS 6.5, and it worked well for a while, then recently whenever I booted into the OS like after the BIOS screen, everything went blank and it ...
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9 views

CentOS login GUI Issue

I am trapped in weird problem. My Setup is CentOS 6.3 64 Bit My login screen is blinking so frequently that I am unable to see and login into it. I previously installed gtk2 using yum install gtk2, ...
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11 views

CentOS - Creating a Virtual Internal Network

I've been looking around for a while now, and I can't seem to find an answer (maybe due to false terminology, searching for VLAN ends up bringing up something completely different). I want to create a ...
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2answers
507 views

CentOS 6.5 - bash: service: command not found

So I can't type service on my CentOS 6.5 server. I'm logged in as root. When typing service I get this error: bash: service: command not found I have also tried to type sudo service, but with no ...
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614 views

PuPHPet, Vagrant and SSH - SSH Connection Timeout

I built a new CentOS 6.5 vagrant box and after provisioning, the SSH connection keeps timing out. I've attempted the steps in Vagrant ssh fails with VirtualBox but I receive errors (see below). I ...
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35 views

centos 6.5 cant recognize gigabyte's onboard graphics card

I have just changed my OS to centos 6.5 and plugged in two monitors, both of the monitors are working but showing the same view. when I try to get the Display settings (System->Preferences->Display) I ...
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45 views

PPTP authenticate using LDAP

I'm using both centos 6.5 in PPTP and LDAP server (OpenDJ). Anyone know how to configure when connecting to PPTP VPN server it will authenticate using the LDAP credentials? Thanks
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187 views

Installing Oracle 12c on CentOs 6.4

I need to install Oracle DB 12c on Centos 6.5/6.4 that has no GUI (or xserver) installed, Is there a way to do it? Can you point me to a manual? Thanks
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1answer
81 views

Why is my yum update failing?

Why is my yum no longer working? It was previously working fine. But seems to have inexplicably stopped working. FYI, I'm running this on Centos system that is running in VirtualBox on my MacBook Pro. ...
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21 views

Connect to CentOS LAMP instance from Windows PCs

I have a CentOS 6 machine running on our network which has a simple LAMP installation on it. I have some files there which I would want to access through other Windows PC which I am able to do so ...
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1answer
557 views

Mirror repository won't work (The requested URL returned error: 403 Forbidden)

I'm trying to find out why I still get the 403 when running the yum install command. I have created a repository mirror which can be read from remote machines. Do you have any suggestions? I have ...
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107 views

yum install gcc fails with invalid linux.dropbox.com/fedora directory

I am relatively new to Linux administration. I have installed Centos 6.5 (under VirtualBox on a Win7pro system). When I try to install gcc to the system using yum, I get the following results: ...
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29 views

Cannot load ubuntu and Mint after installing CentOS 6

I have a 64 bit laptop computer with two partitions containing Ubuntu 14.04 LTS and Mint 17 in each of them. There are some free space of about 20Gb and I have installed CentOS 6 into through USB ...
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45 views

Permission Denied in Crontab

I've searched half a day for the answer to this, with no luck. Any assistance will be appreciated. I have a PHP script that modifies the crontab, loads a new cron job, removes some etc. The script ...
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286 views

Python2.7 / Pip2.7 install in Centos6: root does not see /usr/local/bin

I am trying to install Python2.7 in Centos 6. It's a pain as centos6 ships with python26 and yum is dependent on it. Furthermore yum does not seem to have python2.7 I ended up building it from ...
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38 views

Change order of two-factor-authentication

I am testing two-factor-authentication for ssh logins on some CentOS containers in our testing environment. I compiled my own rpms from github's source, installed and configured everything and have ...
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1answer
53 views

sfdisk can't create more than 4 partitions?

I'm running Centos 6 from command line, and I need to partition my disk using sfdisk more than 5 times. However I can't seem to create more than 4 partitions. >> sfdisk <scsi ID> --force ...
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14 views

CentOS bridged adapter

I am looking for a way to have a bridged adapter that can also forward ports to different IPs for my virtual machines. For example: 192.168.1.101:3391 192.168.1.102:3392 192.168.1.103:3393 Does ...
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1answer
42 views

Cannot jail ssh account using ChrootDirectory

I am trying to jail my accounts into their home directory. I tried to do: Match group accounts X11Forwarding no AllowTcpForwarding no ForceCommand internal-sftp ChrootDirectory %h ...
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184 views

Samba 3.6.9 on CentOS 6.5 existing user unable to connect to new share

I've got a question about samba connectivity. I installed a minimal installation of CentOS 6.5 and have it as a member server of AD, as per this guide: ...
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72 views

SELinux Dependency Errors - Spacewalk on CentOS 6

I've mostly followed this tutorial, and a few other resources, to get Spacewalk set up on a CentOS 6 server. http://www.computerglitch.net/bin/texts/CentOS6_Spacewalk_Server.php I'm getting errors at ...
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35 views

Open man page using nano

I want to open man pages in another text editor, in this case "nano". Does anyone know how I can achieve this please?
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95 views

How to install VLC media player in CentOS6?

I am using the CentOS, version 6, GNU/Linux distribution. I am in need to install VLC media player, what command i need to use at the terminal? I have tried yum install vlc.
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159 views

How to hide or remove the title bar of terminal in centos?

Want to remove the titlebar of the terminal. It would helpful if there is a way to generically do it for all the windows ? If not possible, still if it would be helpful if I can remove or hide the ...
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149 views

cannot connect centos (dell precision) laptop to 2 external monitors (but I can connect to 1 external monitor)

This is my first post here and hope I am following the rules of the forum. I reviewed Connecting 2 External Monitors to a Laptop? and confused with hardware terminology to figure out if my Dell ...
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1answer
89 views

ffmpeg subtitle not visible

I'm using ffmpeg static. I have to two servers. When i encode at the first server, subtitle works; but it does not work at the second server. I installed fontconfig, fontconfig-devel, freetype, ...
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151 views

Build CentOS/RHEL with LFS Live CD

I am aiming at building customized centos/Rhel based distro using Linux From Scratch(LFS) hence, I am following this e-book : http://www.linuxfromscratch.org/lfs/downloads/6.3/ so ,I downloaded an ...
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48 views

Can I set-up sendmail on a LAN without a registered domain for testing mail?

I am running CentOS on a server at home which I use for development of Joomla websites. After they are developed, I move them to a hosting service. While developing the Joomla website on my home Linux ...
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131 views

Dual booting CentOS 6.4 and Ubuntu 12.04.03 LTS

First, I install CentOS 6.4 (64-bit) on /dev/sdb3, and subsequently CentOS install the bootload in /dev/sdb itself. Bootinfoscript indicated that the bootloader is legacy0.92 grub. Fine. Next, I ...
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2answers
44 views

Centos connect to virtualbox network

I have created a virtual network by using virtualbox and I would like to know how can I make Centos connect to it and have its own IP for example 192.168.1.102 because I have a windows 7 virtualbox ...
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80 views

Centos 6 Eclipse font rendering at 8pt

I am running Centos 6.4 and Eclipse Juno and I like coding at 8pt size. I keep seeing a few letters with no spaces in between them. I have tried DejaVu Sans Mono Book, Droid Sans Mono etc. The font in ...
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1answer
25 views

How can I finish the unfinished transaction, so then I can make all the updates?

I try to use yum update and everytime it says me to run yum-complete-transaction first to finish the unfinished transactions remaining. When I try, it loops like forever, and sometimes it ends by ...
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1answer
50 views

Move rvm/gems or make available to root

On a CentOS 6 server I accidentally installed rvm and a bunch of gems as non-root user. Everything is running well, however I'll need to run rvm scripts as super user later. I'd like to fix my ...
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101 views

Avoiding sleep when lid is close and no one is logged in

I've an old Dell Latitude laptop that I've converted to CentOS 6.5. As this is going to work like a server (i.e. no one will use it directly) I've changed from UI the power management option to ignore ...
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43 views

How to keep mysqld alive with minimal memory?

I have a rackspace server that I have been renting to run my personal projects upon. Since I am cheap, it has 256Mb of RAM and honestly can't handle a lot. Every once in a while, when there is a sharp ...
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71 views

hadoop cluster high availability error couldn't find or load main class

[hduser@mn1 bin]$ ./hdfs zkfc -formatZK Error: Could not find or load main class ”-Djava.library.path=”.home.hduser.2.3.0″.lib” I did every step just like in this tutorial, TWICE. The error still ...
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1answer
19 views

Do cronjobs run in CLI?

I am running PHP 5.5 with ZendOPcache integrated. There are two options for this extension - is cache enabled (which I've set to true), and the second one - is CLI cache enabled, which I've set to ...
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107 views

Centos 6.4 network manager disappered

Hi I am using a Centos 6.4 Desktop and from today the newtrok manager stopped appearing and only appears if I run the following command "nm-applet" and keep the terminal window open in order for me to ...