CentOS stands for Community ENTerprise Operating System, the most popular Linux distribution for web servers with almost 30% of all servers using it. Third-party software is not included in the base.

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CentOS 7 and X11R6 Installation

OK so I know just enough about Linux to make me dangerous. As exemplified here: I need CentOS 7 for some newer tools I use, but I also require the use of some older tools. These older tools need ...
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1answer
153 views

Can't receive mail, but can send mail? Centos 6 Postfix/Dovecot

I followed this tutorial to setup my webmail on centos 6: https://www.rosehosting.com/blog/mailserver-with-virtual-users-and-domains-using-postfix-and-dovecot-on-a-centos-6-vps/ Everything is setup ...
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1answer
90 views

Nginx slow downloads even with low disk io

I run a small video streaming website and i've been noticing some problems with videos on my site. I have multiple 1gbit servers and the servers are only going at 1/4 port speed. When I try to load ...
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2answers
148 views

Update-rc.d equivalent on CentOS

I'm trying to get rid of a nasty rootkit on a centOS machine, and I need to remove the starttup scripts from various rcX.d files : The command I'm looking for is an equivalent of the debian: ...
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42 views

Why does ssh/sshd on server try to access /home/<user>/.ssh after I moved my users home directory?

I moved my users home directory with usermod -m -d /path/to/new/home/username which seems to have worked fine. However, in my [moved] home directory I have the ".ssh" folder that is set up to allow ...
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1answer
67 views

How to create/edit files for a nologin user in RHEL/CentOS?

I have a user defined like so: sudo useradd -m -s /sbin/nologin foo It is not meant to be logged into but it is meant to serve a web application. However, if I try to do anything inside the ...
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1answer
113 views

How to format a vps.

I have a VPS bought from digital ocean, and I would like to have it formatted to its default state. However, Digital Ocean provides the option to only "destory" the VPS. Meaning, I would even loos the ...
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1answer
104 views

Unable to Create Files In Directory

There are lot of these kinds of questions on superuser, so I'll try and keep this quick by telling you what it's not: There is no application involved here. Just a user and a filesystem. I can login ...
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102 views

How do I enable taskbar scrolling in Gnome 3 (Centos 7)?

Since last 3-4 years, I have been using Centos 6.x with Gnome 2 that has feature of cycling through windows by scrolling over the taskbar. Recently, I upgraded to Centos 7 that came up with Gnome 3. ...
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85 views

bash create command not found on CentOS 6.5

I am not able to create a database. I get a bash create command not found error on entering fir example: create database rattic; please help CentOS version 6.5
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20 views

How do i find where my apache2 is installed in my centos server?

What methods can I use to find where my apache2 is installed on my centos server? btw, i have cpanel installed. I want to edit my sites-available entries and point one of my domains to another ...
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55 views

How to access the graphical interface of CentOS 7

I'm new on CentOS, I will be thankful with a little help. Going to point. I did the installation of CentOS 7, the installation process had the intent to put this OS side-by-side with Windows 8, a dual ...
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2answers
910 views

Can't find denyhosts in epel 5,6,7 on CentOS 7 x64

So I wish to install denyhosts, installed and enabled the epel repository, but yum install denyhosts still can't find it. I have to notice that I managed to do it on CentOS 6.4 the same easy way, but ...
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115 views

Why doesn't CentOS 6.5 emacs RPM get libotf correctly?

I'm aware that there was a problem with the Red Hat 6 RPM for emacs such that one of its dependencies (libotf) appeared to be satisfied by Open MPI, but it couldn't use the library (see Red Hat bug ...
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1answer
49 views

CentOS : Removed /root

I have been doing experiments with CentOS and now I am in a situation. I have added an user by mentioning his home directory as /root and then I did userdel -rf <username> So its does the ...
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88 views

CentOS 6.3 and GNOME 3 (gnome-shell) installation from repository

Is there any possibility to install GNOME 3 (gnome-shell) from repository on CentOS 6.3, e.g. does some extra repository with GNOME 3 exist? I've read the thread about installing GNOME 3 on CentOS ...
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2answers
125 views

Add a file to /etc/yum.repos.d to install Oracle JDK 1.6.0-45 from yum?

I have a fresh RedHat 6.5 virtual machine on Amazon Web Services (EC2), its repos look like this currently: [root@ip-172-31-11-112 tmp]# ls -1 /etc/yum.repos.d/ redhat-rhui-client-config.repo ...
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41 views

VLAN : machine can't access gateway

I have a VM on centos 6.3 used as a router/firewall with several VLANs. Here is my eth configuration file with a VLAN configuration : eth1 is setup with a public ip. eth3: DEVICE=eth3 ...
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85 views

What's the official way of programmatically changing the GDM login background?

I want to change the background of the GDM login screen on CentOS 6.5 and 7 to bring it in line with other branded systems, and so I have an RPM that delivers a background image into ...
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25 views

ProFTPD Config not working [LIMIT]

Morning All, I have a user called 'ftp' I want them to be able to move files into basically an 'Archive' directory - create files etc, but NOT delete files in the config I have: <Directory ...
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1answer
118 views

CentOS Ruby Install - Open SSL Issue

Attempting to install ruby 2.1.2 on a centos 7 box, but running into a dependency issue with openssl ~ % ruby-install ruby ...blah blah blah... ---> Package openssl-devel.x86_64 1:1.0.1e-34.el7 ...
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51 views

What does it mean to “do an updatedb” on Linux CentOS

It says: And then do an updatedb and locate php.spec. at http://www.howtoforge.com/installing_php_mssql_centos5.0 But what does it actually mean to "do an updatedb"?
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1answer
629 views

gcc error Python.h: No such file or directory

I have python-dev (or, as I'm on Centos, python-devel) already installed. sudo yum install mysql mysql-devel mysql-libs sudo yum install python-devel sudo yum install MySQL-python How come this ...
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233 views

Unable to read package metadata on Centos 6 PXE install

A Centos6 pxe install is not running correctly due to error: Unable to read package metadata. Cannot retrieve repository metadata (repomd.xml) for repository: Centos6-os. However from examining the ...
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136 views

Transaction check error on Yum Update

I can't figure out how to fix this. I get the following error when running a yum update command: Transaction Check Error: file /usr/lib64/nagios/plugins/check_dhcp conflicts between attempted ...
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2answers
426 views

How many drives do I have?

This is the first time I ordered a dedicated server with 3 HDDs and I am quite confused. My limited knowledge tells me that /dev/sda /dev/sdb /dev/sdc are the 3 drives that I actually have. But, ...
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1answer
931 views

With Centos 7 as a Virtualbox guest on a Mac Host, how can I change the screen resolution of the console / command line?

I am using the minimum install of CentOS 7 with command line access only (no graphic support installed). After spending hours reading online about editing grub files, installing guest additions, and ...
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53 views

Ping “requested timed out” when pinging one box to other in hypervisior internal network

I am running a windows 7 box and centos box on hypervisior connected to a hyperV switch with internal network configuration. The subnet for them is 192.168.0.0/24 . The windows 7 has another nic ...
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1answer
37 views

Replace local host file modification with remote. Proxy server or something else?

I need to find a solution for a problem described below (both servers running CentOS 6) My goal is to have visible website to the public where a client will type own domain name mydomain.com and then ...
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236 views

CENTOS 7 File Browser missing tree and settings

OS: CENTOS 7 with GNOME 3 GUI CENTOS 6.5 offered a File Explorer applet that allowed for the ability to save settings (make list view the default, and save tree view as opposed to Places.). I do not ...
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360 views

centos 7: control idle (screen blanking) time?

OS: CENTOS 7 / Gnome 3 GUI How do I the time that must elapse until the OS thinks that the computer is idle and blanks out the screen? I am aware of the new Settings | Privacy | Screen Lock feature, ...
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1answer
743 views

kernel source error on dahdi installation in centos

Trying to install dahdi from the link. I have downloaded package for dahdi. But on doing cd /usr/src/dahdi-linux-complete* make && make install && make config My terminal shows ...
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71 views

How to connect to VirtualBox CentOS VM via FTP?

I am wondering how I can connect to my virtual centos server in VirtualBox VIA FTP so that I can upload and grab files. I dont really want to setup shared folders. Thanks
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1answer
7k views

CentOS 7 DVD ISO vs Everything ISO different [closed]

What is different between CentOS 7 DVD ISO and Everything ISO in http://centos.org/download/ ? CentOS 7 DVD ISO 3.86 GB Everything ISO 6.58 GB
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694 views

Add windows partition to grub2 boot loader in centos 7

I had windows 7 installed on my laptop. Then I installed centos7. Installation completed successfully, but when I reboot I can see only centos and centos recovery. I did not see windows partition. ...
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1answer
99 views

Router cannot separate ip addresses on the same NIC (Vmware)

Here is the scenario of my problem. My network topology: I have an ISP Router Technicolor TG797n v3 and i have a wireless access point set to be a client mode and connected to my PC via Ethernet so ...
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1answer
169 views

GRUB 1.99 CentOS 7

I just added CentOS 7 to an existing Ubuntu system (using GRUB 1.99). When I do a grub-mkconfig -o /boot/grub/grub.cfg, it detects the CentOS, and adds two entries (one looks like normal, one like ...
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75 views

VirtualBox “Bridged Adapter” network doesn't show up in VM

ong story short, I'm trying to re-route information from an Android tablet into a CentOS VM on my Windows 7 host. I've set my Virtual Box manager to have two "Network" adapters (in Settings): ...
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56 views

I'm having an issue with all postfix mail being rejected with “relay access denied” - Centos 6.5, postfix 2.6.6

If I use smtpd_recipient_restrictions, everything gets rejected with "relay access denied". If I use smtpd_relay_restrictions, everything gets through and ignores the whitelist. Not sure what's up; ...
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1answer
110 views

Install tuleap on amazon ec2 linux AMI

I'd like to know if it's possible to install tuleap on amazon ec2 linux ami. I searched the net unsuccessfully and when I try to install tuleap with yum, I get conflict errors (with httpd24, ...
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61 views

If my firewall is switched off,what else could be blocking access to mysql?

I want to have remote access to my mysql server but when i telnet my server from my computer i get this C:\Users\USER>telnet 197.000.0.00 3306 Connecting To 197.000.0.00...Could not open ...
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8 views

CentOS 5.5 Hibernation issue

I use CentOS 5.5 on lenovo Desktop. The issue is it goes into hibernation even if I set the Power Options to never go into hibernation. This is very annoying. I don't want my machine to go to ...
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37 views

Mysql listens to all yet remote connections not possible

I am running this command on Centos netstat -an|grep 3306 | grep LISTEN and it gives me tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN yet when I try to connect to ...
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63 views

Cannot start any virtual machine from VM Player

I am using a Desktop PC with Windows 7 as Operating system. I am using VM PLayer to run a CentOS for me. I am going to use CentOS to setup an Asterisk environment for me so I can conduct studies on ...
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1answer
23 views

Why isn't apache following my symbolic links?

I need to link to a directory from /var/www/html to a directory within the home directory of a non-su user. The operating is CENTos, the server is apache. The config file for the directory is ...
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2answers
116 views

Automatically start a program (Sphinx searchd) when server is restarted?

When my server (running CENTOS) is restarted I have to manually start searchd for each website I use Sphinx on. It's not hard to do (just copy/paste one line in the terminal for each site), but if I ...
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44 views

rm -rf * results in “Killed”

I used PHP to generate about 4,000,000 files in a directory (f/) because I was bored. When I cd .. and use rm -rf f, it simply returns "Killed" about half a second later and does not delete the ...
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2answers
433 views

CentOS. Set environment variable permanently

I used a following commmand in SSH terminal on my server: export LD_LIBRARY_PATH=/lib:/usr/lib:/usr/local/lib and it works fine: my program finds all libraries at this point (if I launch it from my ...
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1answer
947 views

iptables not starting on CentOS 6

I am running CentOS release 6.5 (Final) and cannot figure out why my iptables is not starting. I may have executed some other command to permanently prevent the start up of iptables; I do not ...
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10 views

LINUX: Audio over DVI through a Geforce 295 GTX

I just installed CentOS7 on a frankenserver I made and I can't get audio over DVI. I have used this exact cable/hdmi-dvi-adapter/tv setup on my windows computer with a Geforce 480 gtx and it worked ...