CentOS is an Enterprise-class Linux Distribution derived from Redhat Enterprise Linux sources freely provided to the public.

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5
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1answer
539 views

forward outgoing traffic port using iptables

I am trying to forward all outgoing traffic from port 80 to port 8080 using iptables and I tried the following rule, though it did not work: iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT ...
5
votes
2answers
917 views

How can I ensure only the root user have the right to halt/reboot the system?

CentOS Linux by default allows all users to have permission to "halt" & "reboot" the system by using the commands halt and reboot. How can I configure my system so that only the root user has the ...
4
votes
2answers
6k views

“Last” command: How to show latest user login?

As I know, the last command shows recent logins by all users. But my PC (CentOS) has been used for roughly a year, and there are many users logged. I tried to used the last command, but it just showed ...
4
votes
1answer
9k views

How can I install latest VLC player in cent os 6.4?

I have installed cent os 6.4 in my laptop, I want to know the method of installing VLC in cent os 6.4, Is it necessary to download the vlc package and compile or can I use ''yum install vlc'' to ...
4
votes
1answer
2k views

grub error : “File not found” for separate /boot/efi partition

I've installed CentOS 6.4 on UEFI enabled machine, created /boot/efi partitions. But my grub is not automatically starting, if I start the PC, I start in Windows 8. I can only start CentOS by ...
4
votes
1answer
1k views

CentOS 4.8 and glibc 2.5

How would I go about installing glibc 2.5 on CentOS 4.8? I know CentOS 4.8 has been EOL'd, which is all good and well. However, the environment that I am working in is using this version, and will ...
4
votes
3answers
1k views

No font in emacs on CentOS

When I open emacs over an SSH connection I get this error Warning: Cannot convert string "-*-courier-medium-r-*-*-*-120-*-*-*-*-iso8859-*" to type FontStruct Warning: Cannot convert string ...
3
votes
2answers
279 views

apache won't restart after adding VirtualHost conf file, why not?

In a CentOS 7 server, I get the following error when I type sudo apachectl restart after I add an include file at the bottom of httpd.conf: Job for httpd.service failed. See 'systemctl status ...
3
votes
4answers
143 views

same encryption with /etc/shadow

I'm doing a gui tool for some malware detection script in linux to let server administrators to analyse the result of this script within the web. as I know the encryption used in /etc/shadow is ...
3
votes
3answers
747 views

Centos rpm -qa vs yum list installed

I want to have server b to have exactly the same setup as server a. My plan is to have a list of all installed things on server a and install it by using the list on server b something like : yum ...
3
votes
2answers
136 views

How do I configure logging for ulimits?

I was wondering if anything gets logged when any ulimits are hit (open files, etc). If so, where is this logged, and what should I be looking for? I'm using CentOS 6.
3
votes
2answers
5k views

CentOS - Issue with write permissions

I am running CentOS 6.4 and I have installed Wordpress on it. (along with LAMP) Now the problem is, that I cannot make any write changes to any files in the wordpress editor: eg. header.php, ...
3
votes
3answers
718 views

Colorize Bash Console Color

I need to be able to set my CentOS 6.4 bash prompt color to yellow. I've managed to find where to set this (.bashrc) and the ANSI color for yellow (\e[0;33m). I've setup my prompt as follows: ...
3
votes
1answer
5k views

No networking for Centos under VirtualBox

Running an Ubuntu desktop server. I installed virtual box, then installed CentOS as a virtual machine. Centos is not starting the eth0 network adaptor. When I start it manually, I cannot connect ...
3
votes
2answers
2k views

How to permamently disable SELinux?

We run a site with big traffic surges and, because of that, SELinux usually thinks that the traffic is a SYN flood attack. We have this same problem on many different CentOS servers. Despite ...
3
votes
2answers
5k views

Run getty on a serial port on startup on RHEL

I want to put a getty on ttyS2 on a RHEL 6.1 box so I can use IPMI's serial-over-ethernet functionality to log in to a machine when SSH isn't working. In the past (on Ubuntu?), I used to add a line ...
3
votes
1answer
6k views

How to install KVM on CentOS 6

I can't install kvm on CentOS. I got these errors: [root@localhost etc]# yum groupinstall kvm -y Loaded plugins: fastestmirror, presto Loading mirror speeds from cached hostfile * base: ...
3
votes
2answers
1k views

Using YUM or installing APT on CentOS

I am having trouble with a centOS machine I am using. I need some packages, including john the ripper, but yum cannot find the packages. When I type sudo yum install john, I get back the nothing to ...
2
votes
1answer
32 views

httpd doesn't serve relative url from tomcat, why not?

In a CentOS 7 server, I am trying to set up httpd to act as a reverse proxy for tomcat. I have httpd running perfectly in the sense that I type in http/mydomain.com and it serves up static content ...
2
votes
3answers
309 views

setting mysql root password in CentOS 7

How can I log into the mysql 5.6 command line client and reset the root password in Centos7? I read the following at this link, but it does not work: 1) sudo service mysqld stop 2) sudo service ...
2
votes
2answers
702 views

Difficulty with EncFS on CentOS

I'm trying to figure out encfs, but am having some difficulty. This is what I have done so far: I created 2 test folders mkdir /home/oshiro/Desktop/encrypted mkdir /home/oshiro/Desktop/decrypted ...
2
votes
2answers
1k views

Linux empty buffer cache command permission denied

I'm using the following commands to flush cache: # sync; echo 3 > /proc/sys/vm/drop_caches # sync; echo 2 > /proc/sys/vm/drop_caches # sync; echo 1 > /proc/sys/vm/drop_caches When I use ...
2
votes
1answer
708 views

Why iptables does not fetch information from /etc/sysconfig/iptables on centOs?

I'm new in Linux and encountered with problem with iptables. Here is content of /etc/sysconfig/iptables file # Generated by iptables-save v1.4.7 on Tue Nov 27 21:41:04 2012 *filter :INPUT ACCEPT ...
2
votes
1answer
1k views

Installing KVM on CentOS 6.4 without GUI (yet)

I've installed CentOS 6.4 from the 'minimal' iso, so it doesn't come with a GUI. Will this question's answer allow me to install KVM, or do I need to install KDE or X-server or something first?
2
votes
1answer
462 views

Script for courier maildir folders on CentOS LAMP environment

I'm looking for resources to help me build a script to do monthly maintenance of maildir folders for a typical CentOS LAMP VPS hosting environment. I would like to run a script that runs from a ...
1
vote
0answers
26 views

Questions about whiptail and bash functions

I'm a bash newbie. Say I have this script #!/bin/bash function cpp-lang { yum install "Development Tools" } function updatesys { yum -y update yum -y upgrade } whiptail ...
1
vote
0answers
2k views

mysqld dead but pid file exists

Webserver was running fine for weeks then suddenly: I can access, but I am unable to log into Webmin I can access Magento, a php-based storefront application, but I am no longer able to log in and ...
1
vote
1answer
355 views

cp /etc/DIR_COLORS ~/.dir_colors not responding

I'm using CentOS 6.5 and Putty. My problem is that directory file names are shown in dark blue color which is hard to read. I google searched and found this link; basically it's copying the DIR_COLORS ...
1
vote
3answers
193 views

Reverse a chmod command on a directory

Is there a way to undo a chmod command on a directory in CentOS ?
1
vote
2answers
1k views

ffmpeg installation on Linux REHEL/CentOs 6.X

I had a static installation of ffmpeg but was running into trouble with config files not found so I have since just deleted it. Then I tried re-installing a more current static version just to see if ...
1
vote
2answers
2k views

How to install red5 & Java on centos 6.4

There are many tutorials out there but not so many for 6.4 and it seems people are having problems with running either Java 6 or 7 and Ant. So does anyone know where to find a definitive guide? ...
1
vote
2answers
608 views

Running `sudo /sbin/service mysqld start` causes system to crash

OS: CentOS 5.10 Service: Amazon Web Services Attempted to remove MySQL 5.0 and install MySQL 5.6 I had a server set up, and was going to use MySQL, but it was was set up with MySQL 5.0. Since ...
1
vote
1answer
4k views

Problem compiling a driver : “No rule to make target”

First of all I am running a CentOS 6.4 installation. My computer is a laptop and I am trying to install the drivers for my ethernet card, because this week end I lost my ability to connect to the ...
1
vote
2answers
1k views

fix the virtualbox centos after vdi resizing or expand a LV group

I successfully resized my centos vdi in virtualbox with command VboxManage.exe modifyhd Centos.vdi --resize 12000 But when i started Centos i got error messages that gnome power manager not been ...
1
vote
1answer
510 views

mouse in gnome-terminal

how to set up mouse in terminal window? when i click on midnight commander captions i get raw data from mouse printed as characters in terminal and any running progs don't understand mouses clicks. I ...
1
vote
1answer
3k views

CentOS Apache virtual hosts sites-available type structure

I just set up LAMP on a new CentOS server. Previously when I installed LAMP on Ubuntu, I always needed to create a virtual host definition for each website I create in my /var/www directory. But on ...
0
votes
0answers
46 views

how to make firewall changes permanent via firewall-cmd?

I am trying to open some ports in CentOS 7. I am able to open a port with the following command: firewall-cmd --direct --add-rule ipv4 filter IN_public_allow 0 -m tcp -p tcp --dport 7199 -j ACCEPT ...
0
votes
1answer
63 views

Checking if a mail has arrived, if not then alert

I am using fetchmail in combination with procmail for mail filtering on CentOS where my mail contains various log messages. They serve me so I could search through my mail(logs) for error strings. So ...
0
votes
1answer
401 views

Grant FTP access to specific directory

I have setup CentOS on a box on my local network and installed httpd, PHP, Webmin (and UserMin) etc. I opted for ProFTPd and have opened up ports for FTP, Webmin and Apache. I can now access Webmin ...
0
votes
1answer
232 views

Grub not Recognizing XEN Kernel on Boot

We are able to successfully install and boot to a XEN kernel on 5 of our 7 eucalyptus node controllers. The last two are having the same problems despite running an identical installation process. ...
0
votes
1answer
166 views

Is there a quick way to download a directory in a repo?

I'm actually working from a windows machine, attempting to retrieve centOS 5.4 from their vault. I don't have unpacking software, so I don't want to use the iso's. I was wondering if there's an easy ...
0
votes
1answer
101 views

Is it possible triggering a script with a change of amount of files in a directory? [duplicate]

Is it possible to create some kind of directory watcher and trigger a script when the folder is not empty? I have a CentOS machine with jenkins CI on it. i would like to create a job that will move ...
0
votes
1answer
451 views

Dell D610 6.5 CentOS Installation - Undetected Network Adapters

I've spent the better part of the day attempting to install CentOS 6.5 on an older Dell D610 laptop, using everything from a Minimal Install to the Full DVD. After multiple attempts I was able to ...
0
votes
1answer
588 views

Strange sosreport running on CentOS 6.5 upon login

Before beginning this question, I fully plan to update this post with more information if suggested by commentors or answerers, but other than what I've posted here, I'm not sure what else to post. ...
0
votes
2answers
6k views

Realtek r8169 not working in CentOS 6.5

We have recently purchased Gigabyte 990xe-ud3 motherboards. It came with Realtek LAN conroller. However with CentOS 6.5 it is not working, i.e. although it shows that it's connected with network, it ...
0
votes
0answers
60 views

How can I add PAM functionality in netkit-rsh-0.17

I am using CentOS. In my project, that is working on a network, I need an rsh utility. I downloaded netkit-rsh-0.17 for that and until recently all worked fine. But now I found that this utility ...
0
votes
1answer
733 views

Installing yum on CentOS 5

I have a CentOS vm that I'm currently working on. I tried to update yum and it broke, so I removed it. So I need to re-install it on my vm, can anybody tell me how to install yum on CentOS5?
-1
votes
3answers
100 views

unable to view postfix email from centos 7 command line, why not?

I have postfix installed on a development box and I used the parameters from this other posting to configure postfix to work on localhost only. But the other posting does not explain how to send ...