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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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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114 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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74 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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118 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 ...
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29 views

Directory mode, Create mode Centos Samba

Can someone explain me theoretical side of the directory mode in Samba(centos)? I did check it on Samba main page but I was not smarter + 50 other pages. Maybe I just Google it wrong.
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1answer
32 views

Linux Image to recreate a machine with the same configuration

I have a CentOS 6.5 machine with some installed packages , I want three more identical boxes to be setup and I was wondering if I can make an image of the one machine that I have pre-configured and ...
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46 views

How to setup openlava cluster environment without root?

I found the guide here: http://www.openlava.org/documentation/guide/getting_started.html and the thread here: https://groups.google.com/forum/#!topic/openlava-users/SCBPzOqoJ8U It says that openlava ...
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164 views

Menus of panels of centos 6.5 not always accesable when virtualbox guest windows 8.1 is on fullscreen

I have a computer with CentOS release 6.5 (x64) installed as a host. In a virtual machine of Virtualbox (4.3.6 r91406) I have a guest Windows 8.1 (x64) with guest additions installed. The Windows ...
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25 views

red 5 recorder app set up

Does anyone know how to set up this Red5 Recorder application on Red5 1 RC2 for Linux CentOS 6.4? I followed set up of WEB-INF folder from this document http://fms.denniehoopingarner.com/newapp.html ...
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361 views

How to mount a iSCSI/SAN storage drive to a stable device name (one that can't change on re-connect)?

We need stable device paths for our Twinstrata SAN drives. Many guides for setting up iSCSI connectors simply say to use a device path like /dev/sda or /dev/sdb. This is far from correct, I doubt ...
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158 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 ...
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37 views

Booting Error CentOS 6.4

CentOS 6.4 within Virtual Box on Mac was working fine before testing commands of init 3 (for console only mode). I am curious about I've typed init 0 (halt system). Now, when it boots, nothing other ...
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2answers
4k 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 ...
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1answer
280 views

generate a keystore file in CentOS

How do I generate a keystore file in CentOS? I basically used the following command to generate the keystore and keys: keytool -genkey -alias signFiles -keystore name however I get the ...
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1answer
117 views

yum install Libreoffice Writer without Java

Is it possible for me to yum install LibreOffice Writer without Java also being installed? I don't want to install the full libreoffice package because it prompts me to update my java and tomcat ...
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1answer
316 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.
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74 views

“muxserver_listen: link mux listener … => …: Operation not allowed” trying to reuse ssh socket

My ssh connection from Haiku OS nightly hrev46632 to a CentOS 6.4 box works fine. If I try to set it up to reuse sockets by following these directions: "...consider appending the following to your ...
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94 views

Running a Tomcat 6 with java 6 (1.6.0_39) on CentOS as limited user

The problem is binding to ports under 1024 with a non-root user. I've tried authbind, but it does not support multithreading, and our App spawn multiple threads, and some failed to bind ports. I've ...
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1answer
505 views

CentOS 6.4 console keyboard layout hotswitch

On an X-server-less CentOS 6.4 box (so no setxkbmap) I share with another person, the other person's name is much easier to type in a particular keymap. Ideally, there would be a way, on-the-fly, to ...
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1answer
59 views

No loader-wizard in ioncube installer?

Trying to install IonCube on Centos 6, and well whenever I download the ioncube, there is no installer like the tutorials say there are. I am following the digital ocean tutorial: ...
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1answer
782 views

kvm cpu0 disabled perfctr wrmsr - hangs

I initially asked this question on StackOverflow, but it was marked as off-topic and said I might get help here.. so here it is ============== I am currently running Centos 6.5, and tried to follow ...
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165 views

How to prepare a Centos ISO for creation of Xen domU guest with xl (not xm or virt-install)

I'm tearing my hair out. I will be scripting the creation of large numbers of small HVM (not PV) customer xen CentOS 6.5 guests on a CentOS 6.5 dom0. I therefore do not want to use virt-manager (I'm ...
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1answer
182 views

Centos 6 - Can't get out of safe mode

So I was going into safe mode from following a tut to fix the error Access denied for user 'root'@'localhost' (using password: NO) And I had issued the following command: mysqld_safe ...
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1answer
21 views

Filetype is NET? Other sites on server are “folder”

I am curious as to why two sites on my Centos 6 server are "NET" as the filetype. Does it make a difference vs a folder? Here is a picture for better understanding: As you can see, ...
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359 views

550 Permission Denied for new VSFTPD user

So I have had numerous searches in Google as well as here on Super User. None of them are properly addressing a solution and if so, they aren't related to my issue exactly. root works fine, but I ...
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27 views

centOS is not reading windows8 partition while installing

I am installing centOS over windows 8 in dual boot mode. And I made 30GB free space through windows partition. But when I install centOS , it is not reading that partitions. It shows full hard-disk. ...
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193 views

Auto mounting USB device in Cent-OS 6.4 without GUI

Is there any way to auto mount a USB flash memory on Cent-OS like Ubuntu ?
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20 views

RAM related errors on a CentOS server [duplicate]

I am getting a series of what appears to be RAM related errors on a server. Are these something to worry about? This is being used for scientific computation, is there a risk of data corruption that ...
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128 views

Unable to log in with correct credentials from different locations into vps

I have a VPS running CentOs 6.4 with CPanel 11.38. At the moment my 2 clients can't log in to the mailserver from their location. I have done it myself and the credentials are correct. I can log in ...
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110 views

Share home folder to multiple users in CentOS 6.3

Any way to share the home folder of user1 (/home/user/) to another user (user2) with only read permissions? As of now /home/user is the home directory of user1. I want to make it the home/readable ...
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2answers
1k views

Setting up Samba4 internal DNS forwarder to try multiple DNS servers

Our network setup until recently was that we had a Samba4 server acting as a DNS server for a few internal names, and forwarding to our main router for everything else (i.e. stuff on the internet.) ...
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2answers
582 views

Always have to chown when adding new file? Centos 6

Whenever I upload a new file to my server, I have to chown -R apache:apache /dir in order for it to be accessible. Is there an easier way around this?
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1answer
2k views

Install packages in CentOS from DVD without connection to internet

I have a CentOS 6.4 system with no connection to internet. I have the installer DVD though. How can I install a package, say gcc, using this DVD alone?
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1answer
665 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 ...
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1answer
3k views

How do I block all ports except 22 and 80 in Centos6.2 64bit

How do I block all ports except 22 and 80 in Centos6.2 64bit. thanks all.
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80 views

Tomcat server installation error in Eclipse?

I installed tomcat server successfully, I checked also in the web browser using http://localhost:8080 it gives, and when I configure Tomcat in Eclipse it is showing an error like in this screenshot. ...
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1answer
112 views

Centos 6 log errors, how to fix?

So for some reason all my images on my blog disappear, no idea why now, but the first time it happened I removed Varnish, and the images came back, everything worked fine. An hour later the images ...
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96 views

VPS IP redirects to website instead of the IP directory? CentOs 6

So before I started putting websites on my VPS, I could access the IP directly and it would access the html folder in the /var/www/ area. But ever since I placed websites on the VPS, I can no longer ...
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1answer
101 views

Disabled root login and no root users.. What to do? CentOs 6

So I was undoing some changes here on CentOs 6, and I ended up removing all users who had root access, accept for the root user. But then I realized the root login is disabled, and I just disabled ...
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1answer
2k views

CentOS: View all users in a specific group

I added a user user01 to a group group01 using: usermod -a -G group01 user01 When I run in command id user01 it shows that this user has actually been added to the group. However, the file ...
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1answer
223 views

Warning: DocumentRoot * does not exist on Centos 6

My virtual hosts lines: <VirtualHost *:80> ServerAdmin webmaster@dummy-host.example.com DocumentRoot /www/docs/example.com ServerName example.com ErrorLog ...
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76 views

rsync around a VPN connection on CentOS 6.4

I'm trying to rsync outside of a VPN connection. I have a CentOS 6.4 machine that has an open VPN connection, that capable of roughly 10Mbps, whereas the WAN connection is 40Mbps. I'm trying to rsync ...
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2answers
267 views

semanage command not changing file context

I am trying to change selinux context for upload directory to enable anonymous upload. This is the Directory path /var/ftp/upload This is the default context [root@server ftp]# ls -Z upload ...
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38 views

How to map the cursor keys in the group of keys between PC keyboard and numeric keypad to the numeric keypad?

I am running CentOS 6.4 on my home box. From day 1 I noticed that the cursor keys are not mapped to the keys in the numeric keypad. This is how things work in Windows. I found out that the cursor ...
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1answer
1k 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 ...
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291 views

How to install Boost 1.46 for CentOS 6.4

I'm looking for boost 1.46 for my CentOS 6.4. Is this package available for CentOS 6.4? I need to install it to debug my program. I've install an older version of boost (1.41) but need at least 1.46. ...
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2answers
283 views

Can I run Centos 6 on my old xp computer?

First off, the computer specs: Pentium 4 2.4 GHz 512 MB RAM Asus Broadcom 440 network adapter x86 based PC You may need more information, I don't know. I would like to erase Windows XP and put a ...
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52 views

xend.err 'Error creating domain: pool Pool-0 not activated while creating virtual machine

im trying to load virtualised system. while creating virtual machine got an error xend.err 'Error creating domain: pool Pool-0 not activated