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

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7
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2answers
8k views

When exactly does tmpwatch clear out files I place in /tmp?

CentOS 6.x I'm confused on when exactly files I place in /tmp/ are deleted. /etc/cron.daily/tmpwatch has the following: #! /bin/sh flags=-umc /usr/sbin/tmpwatch "$flags" -x /tmp/.X11-unix -x ...
5
votes
1answer
1k views

rc.local with read will not echo key strokes

I'm using CentOS 6.4 and have a small problem with using read in /etc/rc.local file. It will allow keyboard entry but does not echo any of the key strokes during input. This is something that worked ...
4
votes
2answers
894 views

Separate Network Traffic on Two Network Interfaces

I am not an R&S professional, so much of that realm of computing escapes me. Could you lend your expertise in helping understand how to go about configuring the separation of network traffic on ...
3
votes
1answer
3k views

User logged in by sftp does not show up in `w`

My server is Centos 5. I have a chroot environment set up with the following in my sshd_config Match group sftponly ForceCommand internal-sftp ChrootDirectory %h AllowTcpForwarding no ...
2
votes
1answer
140 views

How can I have multiple email accounts from different domains using Postfix?

I just made it through this helpful article and successfully have my mail server set up with a single domain. What I'm wondering now is how I can be able to add multiple email account for different ...
2
votes
2answers
1k views

centos 7 dual boot with windows 8.1

How do I install CentOS 7 alongside Windows 8.1 to create a dual boot machine? I did this easily enough on a Windows 7 machine using pendrivelinux. But that approach is resulting in a failure to ...
2
votes
0answers
2k views

“xrandr: Failed to get size of gamma for output default” for Guest CENTOS 6.6, HOST OS Windows 7 enterprise

I am getting the following errors: xrandr: Failed to get size of gamma for output default Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768 default connected 1024x768+0+0 0mm ...
2
votes
4answers
49k views

How to undelete just deleted directory with “rm -R” command?

I deleted an important directory with rm -R command. This is an very populer host data. It was located /var/zpanel/hostdata/ayrintilih After remove ayrintilih directory has gone everything. I tried ...
2
votes
5answers
24k views

USB mount doesn't work on Centos 6.4

I have a problem. After an update, my USB drives are not mounted automatically and I'm unable to mount them manually... The output of my fdisk -l command is: Disk /dev/sdb: 15.8 GB, 15762194432 ...
2
votes
1answer
796 views

Can rpm handle an install of another OS into another Logical Volume?

I am trying to install fedora as a domU under a CentOS dom0 using the method outlined in The Book of Xen. I have asked another question regarding a consistent error message of cpio: Bad magic when I ...
2
votes
2answers
2k views

how to make system service out of .jar file? (linux)

i wrote a little java server which i'm running on my CentOS 5 VPS server. currently i just ssh onto the server and start the jar through commandline. How an i turn this jar into a system service and ...
1
vote
1answer
326 views

How to make modprobe nf_conntrack_ftp persist a reboot on CentOS 7 and firewalld?

I'm stumped. I've seen the related questions about editing /etc/sysconfig/iptables-config, but I'm running CentOS 7 (and webmin/virtualmin), which uses firewalld instead of iptables. How do I get ...
1
vote
0answers
629 views

saving file to usb stick while using linux boot stick

I am using the instructions in this youtube video to install CentOS 7 on a new computer that is running Windows 8. The tutorial uses UniversalUSBInstaller from PenDriveLinux, but the installation is ...
1
vote
1answer
1k views

CentOS 7 No package … available

(CentOS 7 64 Bits) Following these steps: http://freevps.us/thread-2789.html I get errors, anyone can help me please? STEP 2, running this command yum install libICE.so.6 libImlib.so.1 ...
1
vote
1answer
2k views

autorun a linux program on startup from a non-root user in centOS 6 64bit

I have a software that needs to be run via specific user "non-root" hence its home directory is /home/non-root/, I have to emphasize that the program must not be run via root and must only run after ...
1
vote
2answers
3k views

SSH connection establishment too slow [duplicate]

I'm having issues while connecting to my Local Centos 6.3 VM with 500 MB ram. Below is the output of ssh -vvv localhost connection: OpenSSH_6.3, OpenSSL 1.0.1e 11 Feb 2013 debug1: Reading ...
1
vote
1answer
2k views

virt-install complains “error: no such option: --network-bridge:br0”

I was following the directions here to set up a VM in CentOS 6.4 i386/686. But I'm getting this error: $ sudo virt-install --network-bridge:br0 --name vm1 --ram=1024 --vcpus=1 --disk ...
1
vote
1answer
2k views

Why did yum-builddep not provide the dependencies to install my rpm?

I am trying to rum my rpm package but getting this dependencies error. [root@localhost ~]# rpm -ivh /root/x86_64/asterisk-1.8.12.2-1.fc15.x86_64.rpm error: Failed dependencies: ...
1
vote
2answers
873 views

Getting error 2006 MySQL server has gone away on CentOS

I need to import a database into a freshly created CentOS 5 virtual machine. However, whenever I run the import command on the console, it stops working in about a minute and I get the error message: ...
0
votes
1answer
92 views

Unable to mount “lvm2” volume

I had to reinstall CentOS on a system with a separate disk array for data. I installed on the OS disks and kept the other disk array as storage (so they were not formatted). When I try to mount the ...
0
votes
1answer
2k views

setting up a relay port for postfix smtp on CentOS 7

A CentOS 7 server has postfix, dovecot, and mailx installed. I am able to make an IMAP connection to the server from my remote Thunderbird client running on my local devbox. But I am not able to ...
0
votes
3answers
361 views

creating and sending a self-signed public key using GnuPG in CentOS 7

I know that I can create a GPG keypair from the CentOS 7 terminal by typing gpg --gen-key and following the resulting steps, but how can I make sure that the resulting public key is self-signed? And ...
0
votes
1answer
2k views

Centos 6.6 can't install couchdb from EPEL repository

the issue is about unavailability of couchdb package in EPEL. Has somebody faces the same issue? yum repolist gets Loaded plugins: fastestmirror, priorities Loading mirror speeds from cached ...
0
votes
1answer
2k views

viewing firewalld logs via remote login to CentOS 7 server

I have firewalld installed in a remote CentOS server. When I log into the server over the internet as root, I type the following command to access the firewalld logs: journalctl ...
30
votes
5answers
55k views

How To Install Virtualbox Guest Additions On CentOS via Command Line only

Reading the Virtualbox user manual, I finally got [here], which explains how to install Virtualbox Guest Additions on a Linux guest via Command Line. But it's not clear enough for me (I just started ...
22
votes
5answers
171k views

How to change hostname on CentOS 6.5?

I can't seem to change the hostname on my CentOS 6.5 host. I am following the instructions I found here: http://www.rackspace.com/knowledge_center/article/centos-hostname-change I set my /etc/hosts ...
11
votes
5answers
12k views

How to find out if a system uses SysV, Upstart or Systemd initsystem [duplicate]

Is there a simple way to find out which initsystem is being used e.g by a recent Debian wheezy or Fedora system? I'm aware that Fedora 21 uses systemd initsystem but that is because I read that and ...
6
votes
2answers
35k views

How to install g++ 4.7.2 & c++11 on CentOS 5.x?

I'm trying to install the latest stable g++ and c++11. My host did it through yum install and thought that it was the latest, but it's not, and they are now saying that this is beyond their level of ...
34
votes
2answers
45k views

In CentOS, what is the difference between yum update and yum upgrade?

What is the difference between yum update and yum upgrade, and when should I use one over the other?
14
votes
2answers
14k views

( /etc/sysconfig/iptables ) “Manual customization of this file is not recommended.” Why?

Editing this file directly /etc/sysconfig/iptables can save me so much headaches so much time and so on... and yet on the very top of the file it says.. Manual customization of this file is not ...
10
votes
9answers
120k views

yum update fails: Error: Cannot retrieve repository metadata (repomd.xml) for repository …

I'm using CentOS 6.3. When I try to update my system with yum I have this message: yum update Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.ircam.fr * ...
21
votes
1answer
29k views

BUG: soft lockup - CPU# stuck for x seconds

I've seen a few bug reports and questions (on stackexchange and elsewhere) regarding a nagging "BUG: soft lockup - CPU#<n> stuck for <dt>s!". So far, I haven't found any clue as to what ...
15
votes
5answers
14k views

Limiting processes to not exceed more than 10% of CPU usage

I operate a Linux system which has a lot of users but sometimes an abuse occurs; where a user might run a single process that uses up more than 80% of the CPU/Memory. So is there a way to prevent ...
12
votes
10answers
51k views

How to extend CentOS 5 partition on VMware?

I have a CentOS 5 virtual machine and I added 20GB more to disk size. How do I initialize and extend the available space? I'm new to Linux, so what should I do? I tried loading GParted as well, ...
4
votes
3answers
18k views

How to create an unprivileged user in CentOS?

I want to create an unprivileged user to run my RhodeCode server and Celery daemon on a CentOS instance. I think the accepted definition of this is no home directory, login disabled, and no shell ...
9
votes
4answers
11k views

How do I combine two logical volumes that reside on a single physical volume in LVM?

I have two logical volumes, one is mounted as /, the other is mounted as /home. I want to combine them, because the / volume is constantly running out of space. (Yes, I know what's using all that ...
12
votes
3answers
14k views

Package bash-completion missing from Yum in CentOS 6

I am trying to get tab-completion working in Yum in CentOS 6 (so I can do something like yum install firefo<TAB> and get back firefox), and I have found many tutorials which say to simply do yum ...
10
votes
1answer
6k views

Configuring OpenVPN to use Firewalld instead of iptables on Centos 7

I need some help configuring OpenVPN on Centos 7 using firewalld. I used iptables on Centos 6.5 and only had to add the following lines to /etc/sysconfig/iptables: -A POSTROUTING -s "10.0.0.0/24" ...
10
votes
3answers
14k views

How can I know which IRQ is responsible of high CPU usage

I've moved a server from one mainboard to another due a disk controller failure. Since then I've noticed that constantly a 25% of one of the cores goes always to IRQ however I haven't managed myself ...
9
votes
0answers
4k views

OpenSSL Package Rebuild CentOS 6.4 [closed]

Rebuilding openssl with Elliptic Curves on CentOS 6.4 The strategy is: 1) Download the "official" CentOS source package (.src.rpm) 2) Modify the .spec file to enable elliptic curves. (change no-EC ...
6
votes
1answer
6k views

Xvfb or Firefox throwing errors & gratuitously logging

per the answer to this question, I'm running Xvfb to make a virtual display so firefox will run on my CentOS server. (I don't need to see firefox or do any actual key or screen input/output with ...
5
votes
2answers
15k views

No network connection in CentOS 6.3 Minimal under VMWare Player

I'm trying to replicate in VMWare Player the exact same conditions I have under my Dedicated Server for testing purposes. Now, the thing is that that when I try to install something, or ping ...
4
votes
1answer
7k views

CentOS doesn't know what the internet is

So I've done my share of investigating this problem... I just recently created a CentOS 6 VM on my LinuxMint box using VirtualBox. I left all the recommended values the same upon creation (8GB HDD, ...
16
votes
7answers
47k views

CentOS 7 Installation Failed

After hearing the news that CentOS 7 had been published, I decided to install it on my computer. I downloaded the ISO image from the CentOS official website (the one named ...
15
votes
3answers
46k views

How to change the hostname of a linux machine using terminal?

I logged in for the first time, opened terminal, and typed in ‘hostname’. It returned ‘localhost.localdomain.com’. Then I logged as the root user in terminal using the command, ‘su –‘, provided the ...
7
votes
3answers
7k views

How to disable beep sound in Linux CentOS 7 command line? [duplicate]

I just installed the basic Linux CentOS 7 (no desktop) and am experimenting with the system. Every time I make a mistake (entering things that the command line doesn't like), the computer beeps and ...
7
votes
4answers
19k views

ldd tells me my app is “not a dynamic executable”

I have a 32-bit application (called uclsyn) I received from an astronomy professor. I managed to get it running on CentOS a year ago, but now when I am setting up a new CentOS VM, it won't run and I ...
5
votes
7answers
514 views

Are there additional ways to protect SSH connections besides firewall and RSA Keys?

Sometimes I don't have a static IP and need to administrate my web server remotely. I'm looking for any additional layers of protection I could add to make opening port 22 safer. Currently I have ...
3
votes
3answers
6k views

Issues in XRDP installation on Cent OS 6.5

I already went through the similar issue tracked in Installing XRDP on Cent OS 6.5, however it haven't helped me to fix. I am using MAC and trying to install XRDP in CentOS release 6.5 (64 bit). So ...
3
votes
2answers
4k views

yum - list configure flags/options used to compile package

How can I see a list of flags/options used to configure and compile a certain package in yum, without having to install it first? Say apache, for example. $ yum list available httpd Available ...