Questions specific to the CentOS Linux distribution. Use this tag if your question relates to how the CentOS distribution affects your problem; do not use it if you just happen to be using CentOS and your question is about a specific configuration detail or syntax.

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290 views

Vagrant + CentOS 7 - Apache fails to start, I don't see an error

I'm spending some time trying to provision a Vagrant box running from a CentOS 7 base box. After a fresh install of Apache, I am able to hit the server over http and restart the server, but as soon ...
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183 views

CentOS 7.1.1503 Minimal cannot install Gnome Desktop via yum groupinstall “GNOME Desktop”

I've installed CentOS 7 as a virtual machine using virtualbox. That part worked fine and I've got my network connection working properly. I've updated yum and that worked fine. It would seem that ...
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228 views

Centos 7 - Can't download RPM (Trying to connect with IPV6)

I am normally an Debian/Ubuntu guy, but I wanted to test the foreman on CentOS 7, but I am having some trouble with the rpm command. I have tried to disable IPV6 with echo 1 > /proc/sys/net/ipv6/...
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75 views

iptables blocking incoming FTP traffic 2/3 minutes after being reset

On CentOS 6.6- At first, iptables was blocking access to my FTP server at all while it was on. After some research I added the lines to /etc/sysconfig/iptables that are suggested in the question ...
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60 views

How has this arrangement of RAID disks occurred and is it recoverable?

I some months ago set up two RAID arrays for a system under CentOS 7. I was somewhat confused that the device list included two entries for each array, i.e. one had /dev/md126 and /dev/md126p1. The ...
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398 views

Centos 7 GUI Freeze problem

I have installed CentOS 7 DVD ISO on my MSI GE70 Laptop that has geforce gtx 765m, when the GUI comes after 5 seconds screen freeze. Is this an nvidia problem? How can I solve it? I cannot disable ...
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1k views

CentOs7 Python 3.4 Install Method

This post relates to this question where I was asked to explain how I installed python3 on my system. I was attempting to install python3 on my system for development purposes. Something went wrong ...
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266 views

how do I mount an external hard drive connected via SATA Wire to CentOS 7

I have CentOS 7 installed as a guest OS inside VirtualBox running on a Windows 8.1 machine. There is a SATA Wire connecting the machine to an external hard drive that used to contain a dual boot ...
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593 views

PuTTY does not connect over SSH; other clients work fine

I have a CentOS system that I can connect to using several SSH clients (FireSSH, WinSCP, MySQL Workbench over SSH). For some reason, PuTTY, which was working a few days ago, can not connect. It will ...
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162 views

How to install a CentOS image manually?

I am moving my project from CentOS 6 to CentOS 7 and need to deal with the changes in the boot requirements introduced by CentOS 7, particularly the upgrade from grub to grub2. The gist of the problem ...
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117 views

compile ffmpeg centos

I used this Guide http://trac.ffmpeg.org/wiki/CompilationGuide/Centos To install ffmpeg in my VPS with CentOS 6 64. But it was installed in /root/bin/ and I need to install it in usr/bin/ to run ...
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1k 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 ...
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0answers
1k views

USB WiFi on CentOS7

I've got a clean installation of CentOS 7 on a desktop PC and a USB WiFI Adapter (RTL8191SU 802.11n). Connecting through USB leads shows "USB Ethernet: connecting" in Gnome3's network status bar. ...
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732 views

Centos 6.6 not booting on Virtualbox on Windows host

I downloaded the QuickStart VM from Cloudera that has preinstalled Spark/Hadoop etc. I have been working on that for the last 4-5 weeks and it was running absolutely fine, but recently I had to ...
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274 views

cannot upgrade kernel (grubby fatal error: unable to find a suitable template)

I have an appliance (read: a PC in a rackmount chassis which sits in the rack and does its job for years without anyone really paying it much attention until it dies) running CentOS 5.4. Trying to ...
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159 views

Job for openvpn@server.service failed

here is the problem during starting the OpenVPN service.. Just after command systemctl start openvpn@server.service terminal shows message: Job for openvpn@server.service failed. See 'systemctl ...
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159 views

Install php apache module from source in CentOS 6.6

I tried running yum install php on my centos box however it kept installing an older version. Therefore I installed apache 2.4 and php 5.4 from source. However, I'm not sure how to install the ...
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0answers
154 views

Run 2 instances of xinit with output to separate video out

I have a video card with 2 video outputs. I want to run 2 instances of xinit and draw 2 different displays. I want one display to be output to one video out and the other to go to the other video out. ...
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0answers
259 views

SSD installed, but shows as HDD in command output

Strange issue here. I have a 480GB SSD drive installed in this server. I installed it myself. I see it, it's there. But, I'm getting an incorrect output on a typically used command to determine if it'...
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290 views

Using Cgroups with Systemd to restrict bash cpu & memory

I want to restrict every user on my Centos 7 server who is logged in via SSH. They should not be able to use, for example, a forkbomb and kill the whole system. The superuser will have no restriction. ...
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122 views

how do I migrate liferay from one server to another?

I'm trying to migrate liferay to another server (both are linux machines, and I'm using the CE bundle with tomcat7). I moved over the entire folder. This is not enough, because usernames/passwords ...
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315 views

Error running startx on CentOS via SSH

Whenever I attempt to run startx on a system I have SSHed into, I get the following output: xauth: creating new authority file /root/.serverauth.6604 X.Org X Server 1.15.0 Release Date: 2013-12-...
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287 views

Problem with usb's on CentOS

I have problem to recognize my USB devices on the CentOS 5.9(Final). Here are all the appropriate commands to help me debug me problem. dmesg | grep usb usbcore: registered new driver usbfs ...
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167 views

I2C driver support baud rate parameter

I have several test machines running CentOS release 6.5 (Final) and we are using Python 3.3 using the SMBus package to communicate over the SMBus (e.g., I2C). We are using the i2c-dev module. The ...
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506 views

PHP Fatal error: Call to undefined function mysql_pconnect() in

PHP Fatal error: Call to undefined function mysql_pconnect() in I'm using php version 5.3. server centos 6 I installed php-mysql. i don't know much about centos. Another server which is centos 5.9 ...
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132 views

How to enable Tcp\Ip remote connections in Centos 7.0

I am running Centos 7.0 using VMPlayer . I have set a private network shared with the host (Windows 7) . On my Centos Server i have opened a tcp listener on port 10102 . I could not connect to this ...
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823 views

“Error uncleared PCH FIFO underrun on transcoder A” during boot centos 7 on toshiba

I have toshiba Satelite model (C50 1001C model number) laptop. When I start it is giving 1.643361 [drm:cpt_serr_int_handler] *ERROR* uncleared PCH FIFO underrun on transcoder A 1.643363 [drm ...
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155 views

GNOME 3: bottom panel window order

I have centos 7.1. At bottom panel opened windows (running applications) are represented (ex: openoffice, thunrderbird, terminal). Question one - How can I change the order of these opened windows (ex:...
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147 views

PHP version info missing from Apache log on startup

I am building a LAMP server (CentOS 6.6), using a current server at work as a roadmap (CentOS 6.4). After installing PHP 5.5.24 and a lot of other modules (mod_nss, mod_perl, etc), everything seems ...
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140 views

Centos 6 and postfix: Internal emails deferred / telnet timed out from SSH

The problem is, that I have a VPS with centOS 6 installed, and I can send emails to anyone, but my own exchange server, Apr 29 11:50:30 amazonnet postfix/smtp[16535]: 2B6FF3CC49A: to=, relay=gmail-...
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44 views

Centos 7 FTP Hidden Directory Issue

After setting up Centos 7 with a web server standard install and LAMP stack. I installed vsftpd. Everything works fine and configured it to accept passive to enable gui ftp programs. However, when ...
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63 views

Cannot resize windows remoting-in through X11VNC?

As title says, I am remoting on to a Linux box (CentOS 6) using X11VNC. However, I cannot resize any windows manually by hovering over the frame, because the frame resize cursor does not appear. ...
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176 views

xterm window positioning

I want a shortcut to start an xterm window with specified number of columns and rows and from the specified starting points. I have CentOS 6.6 and the xterm's version is: X.Org 6.8.99.903(253). I ...
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0answers
213 views

error: cant't find command linux when booting system

I need some help with a problem when booting. Recently I've installed CentOS 7 on my pc, previously I had debian 7 and manjaro installed. When I installed manjaro I overwrote the bootloader of debian ...
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50 views

iptables not getting saved ? centos

I am trying to save the iptables, when I run command #service iptables save it says [ok] but when I again open the iptables the rules get revert to default. Can anyone help me to understand this ?...
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0answers
140 views

CSF not blocking port when removed from csf.conf

I have removed VNC port 5901 from the csf.conf configuration file and executed a csf -f a csf -x and a csf -e to flush and restart CSF. There is a vncserver running on port 5901 and when doing an ...
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0answers
288 views

Protected multilib versions: openssl

I'm running on Centos 6.2 x86_64 Trying to install ruby 2.1.2 ---> Package libselinux-devel.x86_64 0:2.0.94-5.2.el6 will be installed --> Processing Dependency: libsepol-devel >= 2.0.32-1 ...
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0answers
59 views

Preventing automount in CentOS 7

How can I tell CentOS 7 not to mount a new IDE drive (new to the system, but with data I want to examine) the first time I plug it in, so that I can do forensic analysis on it knowing I won't have ...
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0answers
523 views

Timezone problems with CentOS under VirtualBox

I have the following problem on a CentOS 6.5 system running under VirtualBox v4.2.4 on Windows 7 Pro SP1. date always prints a UTC time but with the correct timezone shown, e.g. if I run date at 12:...
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181 views

32-bit package from a repo that should only contain the 64 bit packages

Trying to a do install of some packages and it seems that it is trying to pull a 32-bit package from a 64-bit repo. Installing for dependencies: cyrus-sasl-lib i686 ...
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486 views

Is it possible to convert RHEL to CentOS?

The software vendor that we used has always specified that we should load RHEL on servers we've bought to run their software however they did start to accept CentOS and even now prefer it on new ...
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0answers
471 views

md5 password hash

I'm looking to create a md5 hash to use in /etc/shadow. Someone suggested using grub-crypt. Every time I put the same password in I get a different hash. [root@endpoint ~]# grub-crypt --md5 Password: ...
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0answers
14 views

How can I cause cvs update to use the destination folder's default posix acl mask?

I have a directory and file with these permissions: # file: blue/ # owner: user-a # group: group-a user::rwx user:user-b:rwx group::rwx mask::rwx other::r-x default:user::rwx default:user:user-b:rwx ...
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0answers
300 views

libpcap missing

I’m trying to run a C program, but every time I try to run it I get this message: error while loading shared libraries: libpcap.so.0.8: cannot open shared object file: No such file or directory I'...
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0answers
71 views

Linux user ssh connection disabled after execution of setfacl command

I have very little linux administration experience, after searching a lot stuff online, finally I decided that I must hope that someone helps. The problem is, I needed to share an account with a ...
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0answers
25 views

Where can I find the server config that I am using to send emails with sendmail in CentOS 5.6?

I have a CentOS 5.6 VM and have been able to send emails from my PHP application up until two days ago. I am trying to find the SMTP server config details in my sendmail files somewhere, but I cannot ...
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0answers
65 views

Temporarily mounted filesystems suddenly unmount

On a CentOS 7 machine, I've had several instances recently where filesystems mounted manually (not using an entry in fstab) suddenly get unmounted. This always occurs when I/O is occurring on the ...
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85 views

Compatibilty of the following softwares

I am a professor (Mechanical Engineering department) at a college which is making the transition from Windows to Linux. However, we are quite unsure whether all the CAE softwares that we use would be ...
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0answers
59 views

How do I stop recurring error messages from appearing in messages and auditd.log?

On my CentOS linux machine, in my auditd.conf file, I have set my max_log_file_action=keep_logs. However, in my /var/log/messages and /var/log/auditd.log, the following message appears multiple times ...
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582 views

module scsi_wait_scan not found on CentOS kernel-ml causes kernel panic on boot

I am attempting to upgrade from kernel-lt to kernel-ml, following the instructions here, however on boot the console is flooded with module "scsi_wait_scan" not found This leads to a general kernel ...