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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21
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3answers
24k views

Installed minimal CentOS 6.4 in VirtualBox but have no internet?

I just started using the VirtualBox, but I don't seem to have any internet on the CentOS when I type yum update. Is there a solution to my problem? (it could possibly be a problem with misconfigured ...
17
votes
1answer
43k views

How to Boot CentOS in CLI?

I have a CentOS 6.2 OS which boots into GUI. How, upon startup, can I not boot into the GUI and instead, boot into the CLI? I want to do this at computer startup time.
17
votes
3answers
456 views

How to deduplicate 40TB of data?

I've inherited a research cluster with ~40TB of data across three filesystems. The data stretches back almost 15 years, and there are most likely a good amount of duplicates as researchers copy each ...
8
votes
2answers
39k views

Upgrading PHP 5.3.3 to 5.4.4 in CentOS 6.4

I'm using CentOS 6.4 (centos-release-6-4.el6.centos.10.x86_64). I'm trying to upgrade the php version from 5.3.3 to 5.4.4 by using: yum upgrade php-mysql php-devel php-gd php-pecl-memcache php-pspell ...
6
votes
2answers
22k views

Why is pip not listed in easy_install on CentOS 6? Where to get it?

I am trying to install pip for python on CentOS 6. I thought of installing it through easy_install but it is not there. I tried to find easy_install with find command, but no luck. I tried to ...
5
votes
3answers
5k views

How can I manually control a fan from the terminal?

I'm trying to control the fan speed on my desktop, and I'd appreciate your help. Goal: Use a script to control the fan speed on my computer. Motivation: The embedded BIOS "Smart Fan" settings isn't ...
5
votes
3answers
5k views

How can I configure gdm to allow X connections to other servers/workstations?

I have an issue on all new installs of CentOS 6.2 on my network. Connecting to remote machines using X11 gui software fails for reasons associated with the xauth. I'm not sure how to diagnose but have ...
4
votes
3answers
3k views

What is PAM (Pluggable Authentication Modules) in Linux?

What is PAM (Pluggable Authentication Modules) in Linux? I know it is used for authentication, but what good is this? How does it work? I am using CentOS 6.2.
4
votes
2answers
571 views

Linux cal command not showing proper output

If you type cal 9 1752 in a Linux terminal you will get strange output. For example: [max@avi ~]$ cal 9 1752 September 1752 Su Mo Tu We Th Fr Sa 1 2 14 15 16 17 18 19 20 21 22 23 24 ...
4
votes
2answers
8k views

Why Centos still not using Latest kernel

As i have seen many changes and improvement in kernel 3.xx The improvement i like is dmcache which introduced in kernel 3.9 I have 3 server with centos installed on all machine Centos is still ...
4
votes
1answer
225 views

How to correct a screen wrapping around?

I got my hands on a Ubuntu System (which was displaying correctly) and I installed CentOS 6.3. The screen is wrapping around on itself. Any ideas? See for yourself
3
votes
1answer
11k views

How to get `mail` on a CentOS 6 server (running postfix)

On my old server, and most other devices I have run, there is a provided mail program. On my new CentOS 6 server, running postfix as the MTA, I cannot send command-line email via mail - the tool is ...
3
votes
1answer
2k views

httpd on CentOS resolving only the first VirtualHost

I just got a new cloud server and while setting it up, I can access the web root by pointing my browser to the IP address of my server, but the domain names are still propagating so when I go to them, ...
3
votes
2answers
7k views

NIS failing on CentOS 6

Solved: See bottom. tl;dr: enable network manager. I'm trying to set up a CentOS6 system to login using NIS. I've set up the NISDOMAIN and for the files like passwd to be on the NIS server in ...
3
votes
2answers
3k views

iptables rules for nfs

I was getting below error while typing showmount -e 192.168.56.2 in client machine [root@client ~]# showmount -e 192.168.56.2 clnt_create: RPC: Port mapper failure - Unable to receive: errno 113 (No ...
3
votes
1answer
128 views

Is it possible to have 2 GUI desktop sessions for 2 different users (of same machine)?

I need to set-up the dev-environment to be able to debug the backend of an application in Eclipse. There is a front-end (runnable under user1) and a back-end (runnable under user2). Each user has its ...
3
votes
1answer
13k views

Can't ping ip's or hostnames on fresh CentOS 6.2 install

I just installed CentOS 6.2 on a box using ipmi and have tried setting up the network with no luck. I've got a 66.x.x.56/29 allocation of ip addresses on vlan (66.x.x.56 to 66.x.x.63), so I have set ...
3
votes
3answers
63 views

Where does this name come from? root@<hostname>

When I putty into my CentOS 6 server I am shown root@ DemandStream Development This was a copied and repurposed Linux VM from one of our development environments. How do I change this name? It seems ...
3
votes
1answer
477 views

Wicd set up on centos

I am having difficulties with wicd on start up on CentOS 6. When it starts up it complains that it cannot connect to the DBus and that the daemon has shut down. When I check the log file there is ...
3
votes
1answer
385 views

Why don't my certificates match?

I'm configuring a VPN with OpenVPN without interfaz, the problem is when I try to connect, it says: TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity) ...
2
votes
3answers
4k views

It is not possible to Run Google Chrome as root

I am facing one strange problem in my system. I am using CentOs 6.2 (linux) being root it is not possible to open Google Chrome browser. It giving the error like this... Firefox is working fine in ...
2
votes
2answers
8k 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 ...
2
votes
4answers
8k views

How to know which fonts are installed on CentOS?

Question-1: Is there a way to know what all fonts are installed on the CentOS 6.2 through command-line? I have checked the fonts with the following command ls /usr/share/fonts/default/ghostscript/ ...
2
votes
2answers
275 views

Permission denied error when accessing email folder even when logged in as root

I have a box with iredmail installed in CentoOS 6.4. When trying to access the vmail1 folder, which is the storage path for emails, It get the following: [root@mx vmail]# dir -ls total 12 4 ...
2
votes
1answer
45 views

Why the used disk space increases after yum update?

If I do a yum update on a fresh CentOS 6.5 image, its disk usage increases by 200 MB. The image is a custom AWS image built some 6 months ago. The base image is almost barebones and takes around 1GB. ...
2
votes
1answer
5k views

How do I execute/run a .sql file in PostgreSQL 9.2.6 + CentOs

I would like to know how to execute a .sql file in PostgreSQL. I'm using CentOs 6.4. I have created a database and just need to run a script given to me to create tables. Thanking you in advance.
2
votes
1answer
3k 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 ...
2
votes
2answers
2k views

cpufreq performance module?

I see no cpufreq performance module: $ ll /lib/modules/2.6.32-358.2.1.el6.x86_64/kernel/drivers/cpufreq/ total 88<br/> -rwxr--r--. 1 root root 20576 Mar 12 18:26 cpufreq_conservative.ko ...
2
votes
1answer
112 views

Is LAMP needed in Centos 6.3

I am planning to install OpenVZ on Centos 6.3 and create containers using OS templates.I understand OpenVZ creates Virtual Private Servers.So is there a need to install LAMP in the host distro before ...
2
votes
1answer
2k 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. ...
2
votes
1answer
1k views

Why does ping to google.com or 8.8.8.8 fails

I am using Cent OS 6.4 and it is in a official lab. ping google.com gives the below output and hangs: [root@LAB1 ~]# ping google.com PING google.com (74.125.236.195) 56(84) bytes of data. ping ...
2
votes
2answers
5k views

Unable to login from GUI in CentOS 6.3

I'm facing a weird problem now. Unable to login to the desktop and use the GUI. This problem is somewhat similar to Not able to login through the GUI but there weren't any autologon system enabled. I ...
2
votes
1answer
2k views

Wrong RPMforge Installed

I am running CentOS 6.2 and I installed RPMforge EL5 by mistake and I need to uninstall it and install RPMforge for EL6. How can I do that?
2
votes
1answer
228 views

How to install gzopen library on CentOS 6.4?

I'm compiling a program using gzopen library. How can I install this library in CentOS 6.4? I have tried to install it with yum but package not found! No package gzopen available!
2
votes
2answers
4k views

Cinnamon for CentOS?

I was trying to install Cinnamon from Source code in a CentOS v.6.4. Unfortunately, I was stumbling upon dependencies that were becoming weird each and every time. Some of them, I tried to build, ...
2
votes
1answer
2k views

grub-install gives an error message I don't understand

I'm new to Linux, am using CentOS 6.3, and am attempting to install CentOS 5.8 ISO to a pen drive following instructions from here. My pen drive is /dev/sda and partition 1 is vfat. It's mounted on ...
2
votes
1answer
8k views

How to install/enable compiz on CentOS 6?

How do I install and/or enable compiz-fusion on CentOS 6? The packages don't appear to be in the repositories?
2
votes
1answer
103 views

who -t showing nothing in command prompt

In [root@localhost ~]# man who -t means t, --time print last system clock change I changed the system time using using [root@localhost ~]# date -s 05:27:00 Thu Jul 12 ...
2
votes
1answer
168 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, ...
2
votes
1answer
201 views

Making SSH connection to Centos 6.5 VM takes ages

I installed Centos 6.5 in a Virtual Box VM. Everything works smooth, except for SSH logins. It takes ages for the command prompt to display. With some verbosity added: debug2: kex_derive_keys ...
2
votes
1answer
167 views

how to run as a nobody account?

I'm currently using CentOS 6 on a VPS (openVZ). I just created a user stunnel_user and group stunnel_grp to run stunnel on some nobody:nogroup. I changed the shell of the stunnel_user to ...
2
votes
0answers
379 views

Is my CentOS library multiarch? And what does that mean?

On CentOS release 6.4, I am trying to run a binary. However, it gives the following complaint: (...) requires "/lib/libuuid.so.1" to function. From a quick search, I can see that the only similar ...
2
votes
0answers
393 views

How to multiseat with HW 3d accel on CentOS 6.3 Final?

I would like to setup a multiseat configuration on CentOS 6.3 (two video cards, two keyboards, two mice, two monitors) and have hardware accelerated 3D on both monitors. 3D HW acceleration rules out ...
2
votes
0answers
499 views

403 Forbiden on Apache (CentOS) Server

These are my VM setup: HOST: windows 7 ultimate 32bit GUEST: CentOs 6.3 i386 Virtualization soft: Oracle virtualBox 4.1.22 Networking: NAT -> (PORT FORWARD: HOST:8080 => GUEST:80) Shared ...
2
votes
2answers
586 views

How to restrict user from login saturday and sunday

I am trying to disable login from user avi on Saturday and Sundays, For that I entered this line in /etc/security/time.conf login;*;avi;Wd0900-1700 For checking this I changed system timing but ...
1
vote
1answer
902 views

What does / (forward slash) mean in cd?

I use the following commands to change directory and it generally works fine. [max@localhost max]$ cd / [max@localhost /]$ cd /home/max/ [max@localhost max]$ pwd /home/max But today, by mistake, I ...
1
vote
1answer
358 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 ...
1
vote
1answer
1k views

Linux expert command - where should I enter?

I need to enter "Linux expert" at the boot prompt. I've centOS6.2 DVD but I'm not sure where exactly should I enter this & when will I get the boot prompt? I put the DVD & rebooted & it ...
1
vote
1answer
3k views

How do I install a GUI from the command line?

I have a CENTOS 6.0 machine that I have installed from a x86_64 minimal ISO. It runs at init 3 at the moment, and I want to install a GUI on it. When I do an init 5 from the prompt, all I get is ...
1
vote
1answer
144 views

bind 9 and multiple domain names [closed]

I have been told the following from someone after trying to get more than one domain name (zone) to work on the same BIND instance. We are able to get a single domain name "example.com" working but ...